mirror of
https://github.com/ClickHouse/ClickHouse.git
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7914 lines
326 KiB
C++
7914 lines
326 KiB
C++
#include <Core/Defines.h>
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#include "Common/hex.h"
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#include <Common/Macros.h>
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#include <Common/StringUtils/StringUtils.h>
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#include <Common/ZooKeeper/KeeperException.h>
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#include <Common/ZooKeeper/Types.h>
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#include <Common/escapeForFileName.h>
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#include <Common/formatReadable.h>
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#include <Common/thread_local_rng.h>
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#include <Common/typeid_cast.h>
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#include <base/sort.h>
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#include <Storages/AlterCommands.h>
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#include <Storages/PartitionCommands.h>
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#include <Storages/ColumnsDescription.h>
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#include <Storages/StorageReplicatedMergeTree.h>
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#include <Storages/MergeTree/IMergeTreeDataPart.h>
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#include <Storages/MergeTree/MergeList.h>
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#include <Storages/MergeTree/MergeTreeBackgroundExecutor.h>
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#include <Storages/MergeTree/MergedBlockOutputStream.h>
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#include <Storages/MergeTree/PinnedPartUUIDs.h>
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#include <Storages/MergeTree/ReplicatedMergeTreeTableMetadata.h>
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#include <Storages/MergeTree/ReplicatedMergeTreeSink.h>
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#include <Storages/MergeTree/ReplicatedMergeTreeQuorumEntry.h>
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#include <Storages/MergeTree/ReplicatedMergeTreeMutationEntry.h>
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#include <Storages/MergeTree/ReplicatedMergeTreeAddress.h>
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#include <Storages/MergeTree/ReplicatedMergeTreeQuorumAddedParts.h>
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#include <Storages/MergeTree/ReplicatedMergeTreePartHeader.h>
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#include <Storages/MergeTree/MergeFromLogEntryTask.h>
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#include <Storages/MergeTree/MutateFromLogEntryTask.h>
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#include <Storages/VirtualColumnUtils.h>
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#include <Storages/MergeTree/MergeTreeReaderCompact.h>
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#include <Storages/MergeTree/LeaderElection.h>
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#include <Storages/MergeTree/ZeroCopyLock.h>
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#include <Databases/DatabaseOnDisk.h>
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#include <Parsers/formatAST.h>
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#include <Parsers/parseQuery.h>
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#include <Parsers/ASTDropQuery.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTOptimizeQuery.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/queryToString.h>
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#include <Parsers/ASTCheckQuery.h>
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#include <Parsers/ExpressionListParsers.h>
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#include <Processors/QueryPlan/QueryPlan.h>
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#include <Processors/Sources/RemoteSource.h>
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#include <Processors/QueryPlan/BuildQueryPipelineSettings.h>
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#include <Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h>
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#include <Processors/QueryPlan/ReadFromPreparedSource.h>
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#include <IO/ReadBufferFromString.h>
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#include <IO/Operators.h>
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#include <IO/ConnectionTimeouts.h>
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#include <IO/ConnectionTimeoutsContext.h>
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#include <Interpreters/InterpreterAlterQuery.h>
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#include <Interpreters/PartLog.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/DDLTask.h>
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#include <Interpreters/InterserverCredentials.h>
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#include <Interpreters/SelectQueryOptions.h>
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#include <Interpreters/InterpreterSelectQuery.h>
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#include <Poco/DirectoryIterator.h>
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#include <base/scope_guard.h>
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#include <base/scope_guard_safe.h>
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#include <boost/algorithm/string/join.hpp>
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#include <boost/algorithm/string/replace.hpp>
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#include <algorithm>
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#include <ctime>
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#include <filesystem>
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#include <iterator>
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#include <numeric>
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#include <thread>
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#include <future>
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namespace fs = std::filesystem;
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namespace ProfileEvents
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{
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extern const Event ReplicatedPartFailedFetches;
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extern const Event ReplicatedPartFetchesOfMerged;
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extern const Event ObsoleteReplicatedParts;
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extern const Event ReplicatedPartFetches;
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extern const Event CreatedLogEntryForMerge;
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extern const Event NotCreatedLogEntryForMerge;
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extern const Event CreatedLogEntryForMutation;
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extern const Event NotCreatedLogEntryForMutation;
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}
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namespace CurrentMetrics
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{
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extern const Metric BackgroundFetchesPoolTask;
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int CANNOT_READ_ALL_DATA;
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extern const int NOT_IMPLEMENTED;
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extern const int NO_ZOOKEEPER;
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extern const int INCORRECT_DATA;
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extern const int INCOMPATIBLE_COLUMNS;
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extern const int REPLICA_IS_ALREADY_EXIST;
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extern const int NO_REPLICA_HAS_PART;
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extern const int LOGICAL_ERROR;
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extern const int TOO_MANY_UNEXPECTED_DATA_PARTS;
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extern const int ABORTED;
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extern const int REPLICA_IS_NOT_IN_QUORUM;
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extern const int TABLE_IS_READ_ONLY;
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extern const int NOT_FOUND_NODE;
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extern const int NO_ACTIVE_REPLICAS;
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extern const int NOT_A_LEADER;
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extern const int TABLE_WAS_NOT_DROPPED;
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extern const int PARTITION_ALREADY_EXISTS;
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extern const int TOO_MANY_RETRIES_TO_FETCH_PARTS;
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extern const int RECEIVED_ERROR_FROM_REMOTE_IO_SERVER;
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extern const int PARTITION_DOESNT_EXIST;
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extern const int UNFINISHED;
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extern const int RECEIVED_ERROR_TOO_MANY_REQUESTS;
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extern const int PART_IS_TEMPORARILY_LOCKED;
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extern const int CANNOT_ASSIGN_OPTIMIZE;
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extern const int KEEPER_EXCEPTION;
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extern const int ALL_REPLICAS_LOST;
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extern const int REPLICA_STATUS_CHANGED;
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extern const int CANNOT_ASSIGN_ALTER;
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extern const int DIRECTORY_ALREADY_EXISTS;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int UNKNOWN_POLICY;
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extern const int NO_SUCH_DATA_PART;
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extern const int INTERSERVER_SCHEME_DOESNT_MATCH;
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extern const int DUPLICATE_DATA_PART;
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extern const int BAD_ARGUMENTS;
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extern const int CONCURRENT_ACCESS_NOT_SUPPORTED;
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extern const int CHECKSUM_DOESNT_MATCH;
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}
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namespace ActionLocks
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{
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extern const StorageActionBlockType PartsMerge;
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extern const StorageActionBlockType PartsFetch;
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extern const StorageActionBlockType PartsSend;
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extern const StorageActionBlockType ReplicationQueue;
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extern const StorageActionBlockType PartsTTLMerge;
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extern const StorageActionBlockType PartsMove;
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}
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static const auto QUEUE_UPDATE_ERROR_SLEEP_MS = 1 * 1000;
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static const auto MUTATIONS_FINALIZING_SLEEP_MS = 1 * 1000;
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static const auto MUTATIONS_FINALIZING_IDLE_SLEEP_MS = 5 * 1000;
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void StorageReplicatedMergeTree::setZooKeeper()
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{
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/// Every ReplicatedMergeTree table is using only one ZooKeeper session.
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/// But if several ReplicatedMergeTree tables are using different
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/// ZooKeeper sessions, some queries like ATTACH PARTITION FROM may have
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/// strange effects. So we always use only one session for all tables.
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/// (excluding auxiliary zookeepers)
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std::lock_guard lock(current_zookeeper_mutex);
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if (zookeeper_name == default_zookeeper_name)
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{
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current_zookeeper = getContext()->getZooKeeper();
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}
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else
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{
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current_zookeeper = getContext()->getAuxiliaryZooKeeper(zookeeper_name);
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}
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}
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zkutil::ZooKeeperPtr StorageReplicatedMergeTree::tryGetZooKeeper() const
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{
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std::lock_guard lock(current_zookeeper_mutex);
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return current_zookeeper;
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}
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zkutil::ZooKeeperPtr StorageReplicatedMergeTree::getZooKeeper() const
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{
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auto res = tryGetZooKeeper();
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if (!res)
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throw Exception("Cannot get ZooKeeper", ErrorCodes::NO_ZOOKEEPER);
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return res;
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}
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zkutil::ZooKeeperPtr StorageReplicatedMergeTree::getZooKeeperAndAssertNotReadonly() const
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{
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/// There's a short period of time after connection loss when new session is created,
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/// but replication queue is not reinitialized. We must ensure that table is not readonly anymore
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/// before using new ZooKeeper session to write something (except maybe GET_PART) into replication log.
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auto res = getZooKeeper();
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assertNotReadonly();
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return res;
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}
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static MergeTreePartInfo makeDummyDropRangeForMovePartitionOrAttachPartitionFrom(const String & partition_id)
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{
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/// NOTE We don't have special log entry type for MOVE PARTITION/ATTACH PARTITION FROM,
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/// so we use REPLACE_RANGE with dummy range of one block, which means "attach, not replace".
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/// It's safe to fill drop range for MOVE PARTITION/ATTACH PARTITION FROM with zeros,
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/// because drop range for REPLACE PARTITION must contain at least 2 blocks,
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/// so we can distinguish dummy drop range from any real or virtual part.
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/// But we should never construct such part name, even for virtual part,
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/// because it can be confused with real part <partition>_0_0_0.
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/// TODO get rid of this.
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MergeTreePartInfo drop_range;
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drop_range.partition_id = partition_id;
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drop_range.min_block = 0;
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drop_range.max_block = 0;
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drop_range.level = 0;
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drop_range.mutation = 0;
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return drop_range;
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}
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StorageReplicatedMergeTree::StorageReplicatedMergeTree(
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const String & zookeeper_path_,
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const String & replica_name_,
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bool attach,
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const StorageID & table_id_,
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const String & relative_data_path_,
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const StorageInMemoryMetadata & metadata_,
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ContextMutablePtr context_,
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const String & date_column_name,
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const MergingParams & merging_params_,
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std::unique_ptr<MergeTreeSettings> settings_,
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bool has_force_restore_data_flag,
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bool allow_renaming_)
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: MergeTreeData(table_id_,
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relative_data_path_,
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metadata_,
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context_,
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date_column_name,
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merging_params_,
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std::move(settings_),
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true, /// require_part_metadata
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attach,
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[this] (const std::string & name) { enqueuePartForCheck(name); })
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, zookeeper_name(zkutil::extractZooKeeperName(zookeeper_path_))
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, zookeeper_path(zkutil::extractZooKeeperPath(zookeeper_path_, /* check_starts_with_slash */ !attach, log))
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, replica_name(replica_name_)
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, replica_path(fs::path(zookeeper_path) / "replicas" / replica_name_)
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, reader(*this)
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, writer(*this)
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, merger_mutator(*this,
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getContext()->getSettingsRef().background_merges_mutations_concurrency_ratio *
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getContext()->getSettingsRef().background_pool_size)
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, merge_strategy_picker(*this)
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, queue(*this, merge_strategy_picker)
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, fetcher(*this)
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, cleanup_thread(*this)
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, part_check_thread(*this)
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, restarting_thread(*this)
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, part_moves_between_shards_orchestrator(*this)
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, allow_renaming(allow_renaming_)
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, replicated_fetches_pool_size(getContext()->getSettingsRef().background_fetches_pool_size)
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, replicated_fetches_throttler(std::make_shared<Throttler>(getSettings()->max_replicated_fetches_network_bandwidth, getContext()->getReplicatedFetchesThrottler()))
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, replicated_sends_throttler(std::make_shared<Throttler>(getSettings()->max_replicated_sends_network_bandwidth, getContext()->getReplicatedSendsThrottler()))
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{
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queue_updating_task = getContext()->getSchedulePool().createTask(
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getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::queueUpdatingTask)", [this]{ queueUpdatingTask(); });
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mutations_updating_task = getContext()->getSchedulePool().createTask(
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getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::mutationsUpdatingTask)", [this]{ mutationsUpdatingTask(); });
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merge_selecting_task = getContext()->getSchedulePool().createTask(
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getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::mergeSelectingTask)", [this] { mergeSelectingTask(); });
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/// Will be activated if we win leader election.
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merge_selecting_task->deactivate();
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mutations_finalizing_task = getContext()->getSchedulePool().createTask(
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getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::mutationsFinalizingTask)", [this] { mutationsFinalizingTask(); });
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if (getContext()->hasZooKeeper() || getContext()->hasAuxiliaryZooKeeper(zookeeper_name))
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{
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/// It's possible for getZooKeeper() to timeout if zookeeper host(s) can't
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/// be reached. In such cases Poco::Exception is thrown after a connection
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/// timeout - refer to src/Common/ZooKeeper/ZooKeeperImpl.cpp:866 for more info.
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///
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/// Side effect of this is that the CreateQuery gets interrupted and it exits.
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/// But the data Directories for the tables being created aren't cleaned up.
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/// This unclean state will hinder table creation on any retries and will
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/// complain that the Directory for table already exists.
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///
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/// To achieve a clean state on failed table creations, catch this error and
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/// call dropIfEmpty() method only if the operation isn't ATTACH then proceed
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/// throwing the exception. Without this, the Directory for the tables need
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/// to be manually deleted before retrying the CreateQuery.
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try
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{
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if (zookeeper_name == default_zookeeper_name)
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{
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current_zookeeper = getContext()->getZooKeeper();
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}
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else
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{
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current_zookeeper = getContext()->getAuxiliaryZooKeeper(zookeeper_name);
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}
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}
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catch (...)
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{
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if (!attach)
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dropIfEmpty();
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throw;
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}
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}
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bool skip_sanity_checks = false;
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if (current_zookeeper && current_zookeeper->exists(replica_path + "/flags/force_restore_data"))
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{
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skip_sanity_checks = true;
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current_zookeeper->remove(replica_path + "/flags/force_restore_data");
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LOG_WARNING(log, "Skipping the limits on severity of changes to data parts and columns (flag {}/flags/force_restore_data).", replica_path);
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}
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else if (has_force_restore_data_flag)
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{
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skip_sanity_checks = true;
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LOG_WARNING(log, "Skipping the limits on severity of changes to data parts and columns (flag force_restore_data).");
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}
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loadDataParts(skip_sanity_checks);
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if (!current_zookeeper)
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{
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if (!attach)
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{
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dropIfEmpty();
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throw Exception("Can't create replicated table without ZooKeeper", ErrorCodes::NO_ZOOKEEPER);
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}
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/// Do not activate the replica. It will be readonly.
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LOG_ERROR(log, "No ZooKeeper: table will be in readonly mode.");
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has_metadata_in_zookeeper = std::nullopt;
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return;
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}
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if (attach && !current_zookeeper->exists(zookeeper_path + "/metadata"))
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{
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LOG_WARNING(log, "No metadata in ZooKeeper for {}: table will be in readonly mode.", zookeeper_path);
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has_metadata_in_zookeeper = false;
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return;
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}
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auto metadata_snapshot = getInMemoryMetadataPtr();
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/// May it be ZK lost not the whole root, so the upper check passed, but only the /replicas/replica
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/// folder.
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if (attach && !current_zookeeper->exists(replica_path))
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{
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LOG_WARNING(log, "No metadata in ZooKeeper for {}: table will be in readonly mode", replica_path);
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has_metadata_in_zookeeper = false;
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return;
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}
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has_metadata_in_zookeeper = true;
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if (!attach)
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{
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if (!getDataParts().empty())
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throw Exception("Data directory for table already contains data parts"
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" - probably it was unclean DROP table or manual intervention."
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" You must either clear directory by hand or use ATTACH TABLE"
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" instead of CREATE TABLE if you need to use that parts.", ErrorCodes::INCORRECT_DATA);
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try
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{
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bool is_first_replica = createTableIfNotExists(metadata_snapshot);
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try
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{
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/// NOTE If it's the first replica, these requests to ZooKeeper look redundant, we already know everything.
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/// We have to check granularity on other replicas. If it's fixed we
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/// must create our new replica with fixed granularity and store this
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/// information in /replica/metadata.
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other_replicas_fixed_granularity = checkFixedGranularityInZookeeper();
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checkTableStructure(zookeeper_path, metadata_snapshot);
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Coordination::Stat metadata_stat;
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current_zookeeper->get(zookeeper_path + "/metadata", &metadata_stat);
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metadata_version = metadata_stat.version;
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}
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catch (Coordination::Exception & e)
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{
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if (!is_first_replica && e.code == Coordination::Error::ZNONODE)
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throw Exception("Table " + zookeeper_path + " was suddenly removed.", ErrorCodes::ALL_REPLICAS_LOST);
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else
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throw;
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}
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if (!is_first_replica)
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createReplica(metadata_snapshot);
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}
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catch (...)
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{
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/// If replica was not created, rollback creation of data directory.
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dropIfEmpty();
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throw;
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}
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}
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else
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{
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/// In old tables this node may missing or be empty
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String replica_metadata;
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const bool replica_metadata_exists = current_zookeeper->tryGet(replica_path + "/metadata", replica_metadata);
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if (!replica_metadata_exists || replica_metadata.empty())
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{
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/// We have to check shared node granularity before we create ours.
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other_replicas_fixed_granularity = checkFixedGranularityInZookeeper();
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ReplicatedMergeTreeTableMetadata current_metadata(*this, metadata_snapshot);
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current_zookeeper->createOrUpdate(replica_path + "/metadata", current_metadata.toString(),
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zkutil::CreateMode::Persistent);
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}
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checkTableStructure(replica_path, metadata_snapshot);
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checkParts(skip_sanity_checks);
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if (current_zookeeper->exists(replica_path + "/metadata_version"))
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{
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metadata_version = parse<int>(current_zookeeper->get(replica_path + "/metadata_version"));
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}
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else
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{
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/// This replica was created with old clickhouse version, so we have
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/// to take version of global node. If somebody will alter our
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/// table, then we will fill /metadata_version node in zookeeper.
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/// Otherwise on the next restart we can again use version from
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/// shared metadata node because it was not changed.
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Coordination::Stat metadata_stat;
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current_zookeeper->get(zookeeper_path + "/metadata", &metadata_stat);
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metadata_version = metadata_stat.version;
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}
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/// Temporary directories contain uninitialized results of Merges or Fetches (after forced restart),
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/// don't allow to reinitialize them, delete each of them immediately.
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clearOldTemporaryDirectories(0);
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clearOldWriteAheadLogs();
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}
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createNewZooKeeperNodes();
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syncPinnedPartUUIDs();
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createTableSharedID();
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|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::checkFixedGranularityInZookeeper()
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
String metadata_str = zookeeper->get(zookeeper_path + "/metadata");
|
|
auto metadata_from_zk = ReplicatedMergeTreeTableMetadata::parse(metadata_str);
|
|
return metadata_from_zk.index_granularity_bytes == 0;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::waitMutationToFinishOnReplicas(
|
|
const Strings & replicas, const String & mutation_id) const
|
|
{
|
|
if (replicas.empty())
|
|
return;
|
|
|
|
|
|
std::set<String> inactive_replicas;
|
|
for (const String & replica : replicas)
|
|
{
|
|
LOG_DEBUG(log, "Waiting for {} to apply mutation {}", replica, mutation_id);
|
|
zkutil::EventPtr wait_event = std::make_shared<Poco::Event>();
|
|
|
|
while (!partial_shutdown_called)
|
|
{
|
|
/// Mutation maybe killed or whole replica was deleted.
|
|
/// Wait event will unblock at this moment.
|
|
Coordination::Stat exists_stat;
|
|
if (!getZooKeeper()->exists(fs::path(zookeeper_path) / "mutations" / mutation_id, &exists_stat, wait_event))
|
|
{
|
|
throw Exception(ErrorCodes::UNFINISHED, "Mutation {} was killed, manually removed or table was dropped", mutation_id);
|
|
}
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
/// Replica could be inactive.
|
|
if (!zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active"))
|
|
{
|
|
LOG_WARNING(log, "Replica {} is not active during mutation. Mutation will be done asynchronously when replica becomes active.", replica);
|
|
|
|
inactive_replicas.emplace(replica);
|
|
break;
|
|
}
|
|
|
|
String mutation_pointer = fs::path(zookeeper_path) / "replicas" / replica / "mutation_pointer";
|
|
std::string mutation_pointer_value;
|
|
/// Replica could be removed
|
|
if (!zookeeper->tryGet(mutation_pointer, mutation_pointer_value, nullptr, wait_event))
|
|
{
|
|
LOG_WARNING(log, "Replica {} was removed", replica);
|
|
break;
|
|
}
|
|
else if (mutation_pointer_value >= mutation_id) /// Maybe we already processed more fresh mutation
|
|
break; /// (numbers like 0000000000 and 0000000001)
|
|
|
|
/// Replica can become inactive, so wait with timeout and recheck it
|
|
if (wait_event->tryWait(1000))
|
|
continue;
|
|
|
|
/// Here we check mutation for errors on local replica. If they happen on this replica
|
|
/// they will happen on each replica, so we can check only in-memory info.
|
|
auto mutation_status = queue.getIncompleteMutationsStatus(mutation_id);
|
|
/// If mutation status is empty, than local replica may just not loaded it into memory.
|
|
if (mutation_status && !mutation_status->latest_fail_reason.empty())
|
|
break;
|
|
}
|
|
|
|
/// This replica inactive, don't check anything
|
|
if (!inactive_replicas.empty() && inactive_replicas.count(replica))
|
|
break;
|
|
|
|
/// It maybe already removed from zk, but local in-memory mutations
|
|
/// state was not updated.
|
|
if (!getZooKeeper()->exists(fs::path(zookeeper_path) / "mutations" / mutation_id))
|
|
{
|
|
throw Exception(ErrorCodes::UNFINISHED, "Mutation {} was killed, manually removed or table was dropped", mutation_id);
|
|
}
|
|
|
|
if (partial_shutdown_called)
|
|
throw Exception("Mutation is not finished because table shutdown was called. It will be done after table restart.",
|
|
ErrorCodes::UNFINISHED);
|
|
|
|
/// Replica inactive, don't check mutation status
|
|
if (!inactive_replicas.empty() && inactive_replicas.count(replica))
|
|
continue;
|
|
|
|
/// At least we have our current mutation
|
|
std::set<String> mutation_ids;
|
|
mutation_ids.insert(mutation_id);
|
|
|
|
/// Here we check mutation for errors or kill on local replica. If they happen on this replica
|
|
/// they will happen on each replica, so we can check only in-memory info.
|
|
auto mutation_status = queue.getIncompleteMutationsStatus(mutation_id, &mutation_ids);
|
|
checkMutationStatus(mutation_status, mutation_ids);
|
|
}
|
|
|
|
if (!inactive_replicas.empty())
|
|
{
|
|
throw Exception(ErrorCodes::UNFINISHED,
|
|
"Mutation is not finished because some replicas are inactive right now: {}. Mutation will be done asynchronously",
|
|
boost::algorithm::join(inactive_replicas, ", "));
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::createNewZooKeeperNodes()
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
/// Working with quorum.
|
|
zookeeper->createIfNotExists(zookeeper_path + "/quorum", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/quorum/parallel", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/quorum/last_part", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/quorum/failed_parts", String());
|
|
|
|
/// Tracking lag of replicas.
|
|
zookeeper->createIfNotExists(replica_path + "/min_unprocessed_insert_time", String());
|
|
zookeeper->createIfNotExists(replica_path + "/max_processed_insert_time", String());
|
|
|
|
/// Mutations
|
|
zookeeper->createIfNotExists(zookeeper_path + "/mutations", String());
|
|
zookeeper->createIfNotExists(replica_path + "/mutation_pointer", String());
|
|
|
|
/// Nodes for remote fs zero-copy replication
|
|
const auto settings = getSettings();
|
|
if (settings->allow_remote_fs_zero_copy_replication)
|
|
{
|
|
zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_s3", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_s3/shared", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_hdfs", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_hdfs/shared", String());
|
|
}
|
|
|
|
/// Part movement.
|
|
zookeeper->createIfNotExists(zookeeper_path + "/part_moves_shard", String());
|
|
zookeeper->createIfNotExists(zookeeper_path + "/pinned_part_uuids", getPinnedPartUUIDs()->toString());
|
|
/// For ALTER PARTITION with multi-leaders
|
|
zookeeper->createIfNotExists(zookeeper_path + "/alter_partition_version", String());
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::createTableIfNotExists(const StorageMetadataPtr & metadata_snapshot)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
zookeeper->createAncestors(zookeeper_path);
|
|
|
|
for (size_t i = 0; i < 1000; ++i)
|
|
{
|
|
/// Invariant: "replicas" does not exist if there is no table or if there are leftovers from incompletely dropped table.
|
|
if (zookeeper->exists(zookeeper_path + "/replicas"))
|
|
{
|
|
LOG_DEBUG(log, "This table {} is already created, will add new replica", zookeeper_path);
|
|
return false;
|
|
}
|
|
|
|
/// There are leftovers from incompletely dropped table.
|
|
if (zookeeper->exists(zookeeper_path + "/dropped"))
|
|
{
|
|
/// This condition may happen when the previous drop attempt was not completed
|
|
/// or when table is dropped by another replica right now.
|
|
/// This is Ok because another replica is definitely going to drop the table.
|
|
|
|
LOG_WARNING(log, "Removing leftovers from table {} (this might take several minutes)", zookeeper_path);
|
|
String drop_lock_path = zookeeper_path + "/dropped/lock";
|
|
Coordination::Error code = zookeeper->tryCreate(drop_lock_path, "", zkutil::CreateMode::Ephemeral);
|
|
|
|
if (code == Coordination::Error::ZNONODE || code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_WARNING(log, "The leftovers from table {} were removed by another replica", zookeeper_path);
|
|
}
|
|
else if (code != Coordination::Error::ZOK)
|
|
{
|
|
throw Coordination::Exception(code, drop_lock_path);
|
|
}
|
|
else
|
|
{
|
|
auto metadata_drop_lock = zkutil::EphemeralNodeHolder::existing(drop_lock_path, *zookeeper);
|
|
if (!removeTableNodesFromZooKeeper(zookeeper, zookeeper_path, metadata_drop_lock, log))
|
|
{
|
|
/// Someone is recursively removing table right now, we cannot create new table until old one is removed
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
LOG_DEBUG(log, "Creating table {}", zookeeper_path);
|
|
|
|
/// We write metadata of table so that the replicas can check table parameters with them.
|
|
String metadata_str = ReplicatedMergeTreeTableMetadata(*this, metadata_snapshot).toString();
|
|
|
|
Coordination::Requests ops;
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path, "", zkutil::CreateMode::Persistent));
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/metadata", metadata_str,
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/columns", metadata_snapshot->getColumns().toString(),
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/log", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/blocks", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/block_numbers", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/nonincrement_block_numbers", "",
|
|
zkutil::CreateMode::Persistent)); /// /nonincrement_block_numbers dir is unused, but is created nonetheless for backwards compatibility.
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/leader_election", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/temp", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/replicas", "last added replica: " + replica_name,
|
|
zkutil::CreateMode::Persistent));
|
|
|
|
/// And create first replica atomically. See also "createReplica" method that is used to create not the first replicas.
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path, "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/host", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/log_pointer", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/queue", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/parts", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/flags", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/is_lost", "0",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/metadata", metadata_str,
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/columns", metadata_snapshot->getColumns().toString(),
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/metadata_version", std::to_string(metadata_version),
|
|
zkutil::CreateMode::Persistent));
|
|
|
|
Coordination::Responses responses;
|
|
auto code = zookeeper->tryMulti(ops, responses);
|
|
if (code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_WARNING(log, "It looks like the table {} was created by another server at the same moment, will retry", zookeeper_path);
|
|
continue;
|
|
}
|
|
else if (code != Coordination::Error::ZOK)
|
|
{
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// Do not use LOGICAL_ERROR code, because it may happen if user has specified wrong zookeeper_path
|
|
throw Exception("Cannot create table, because it is created concurrently every time "
|
|
"or because of wrong zookeeper_path "
|
|
"or because of logical error", ErrorCodes::REPLICA_IS_ALREADY_EXIST);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::createReplica(const StorageMetadataPtr & metadata_snapshot)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
LOG_DEBUG(log, "Creating replica {}", replica_path);
|
|
|
|
Coordination::Error code;
|
|
|
|
do
|
|
{
|
|
Coordination::Stat replicas_stat;
|
|
String replicas_value;
|
|
|
|
if (!zookeeper->tryGet(zookeeper_path + "/replicas", replicas_value, &replicas_stat))
|
|
throw Exception(ErrorCodes::ALL_REPLICAS_LOST,
|
|
"Cannot create a replica of the table {}, because the last replica of the table was dropped right now",
|
|
zookeeper_path);
|
|
|
|
/// It is not the first replica, we will mark it as "lost", to immediately repair (clone) from existing replica.
|
|
/// By the way, it's possible that the replica will be first, if all previous replicas were removed concurrently.
|
|
const String is_lost_value = replicas_stat.numChildren ? "1" : "0";
|
|
|
|
Coordination::Requests ops;
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path, "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/host", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/log_pointer", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/queue", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/parts", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/flags", "",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/is_lost", is_lost_value,
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/metadata", ReplicatedMergeTreeTableMetadata(*this, metadata_snapshot).toString(),
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/columns", metadata_snapshot->getColumns().toString(),
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/metadata_version", std::to_string(metadata_version),
|
|
zkutil::CreateMode::Persistent));
|
|
|
|
/// Check version of /replicas to see if there are any replicas created at the same moment of time.
|
|
ops.emplace_back(zkutil::makeSetRequest(zookeeper_path + "/replicas", "last added replica: " + replica_name, replicas_stat.version));
|
|
|
|
Coordination::Responses responses;
|
|
code = zookeeper->tryMulti(ops, responses);
|
|
|
|
switch (code)
|
|
{
|
|
case Coordination::Error::ZNODEEXISTS:
|
|
throw Exception(ErrorCodes::REPLICA_IS_ALREADY_EXIST, "Replica {} already exists", replica_path);
|
|
case Coordination::Error::ZBADVERSION:
|
|
LOG_ERROR(log, "Retrying createReplica(), because some other replicas were created at the same time");
|
|
break;
|
|
case Coordination::Error::ZNONODE:
|
|
throw Exception(ErrorCodes::ALL_REPLICAS_LOST, "Table {} was suddenly removed", zookeeper_path);
|
|
default:
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
} while (code == Coordination::Error::ZBADVERSION);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::drop()
|
|
{
|
|
/// There is also the case when user has configured ClickHouse to wrong ZooKeeper cluster
|
|
/// or metadata of staled replica were removed manually,
|
|
/// in this case, has_metadata_in_zookeeper = false, and we also permit to drop the table.
|
|
|
|
bool maybe_has_metadata_in_zookeeper = !has_metadata_in_zookeeper.has_value() || *has_metadata_in_zookeeper;
|
|
if (maybe_has_metadata_in_zookeeper)
|
|
{
|
|
/// Table can be shut down, restarting thread is not active
|
|
/// and calling StorageReplicatedMergeTree::getZooKeeper()/getAuxiliaryZooKeeper() won't suffice.
|
|
zkutil::ZooKeeperPtr zookeeper;
|
|
if (zookeeper_name == default_zookeeper_name)
|
|
zookeeper = getContext()->getZooKeeper();
|
|
else
|
|
zookeeper = getContext()->getAuxiliaryZooKeeper(zookeeper_name);
|
|
|
|
/// If probably there is metadata in ZooKeeper, we don't allow to drop the table.
|
|
if (!zookeeper)
|
|
throw Exception("Can't drop readonly replicated table (need to drop data in ZooKeeper as well)", ErrorCodes::TABLE_IS_READ_ONLY);
|
|
|
|
shutdown();
|
|
dropReplica(zookeeper, zookeeper_path, replica_name, log);
|
|
}
|
|
|
|
dropAllData();
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::dropReplica(zkutil::ZooKeeperPtr zookeeper, const String & zookeeper_path, const String & replica, Poco::Logger * logger)
|
|
{
|
|
if (zookeeper->expired())
|
|
throw Exception("Table was not dropped because ZooKeeper session has expired.", ErrorCodes::TABLE_WAS_NOT_DROPPED);
|
|
|
|
auto remote_replica_path = zookeeper_path + "/replicas/" + replica;
|
|
|
|
LOG_INFO(logger, "Removing replica {}, marking it as lost", remote_replica_path);
|
|
/// Mark itself lost before removing, because the following recursive removal may fail
|
|
/// and partially dropped replica may be considered as alive one (until someone will mark it lost)
|
|
zookeeper->trySet(remote_replica_path + "/is_lost", "1");
|
|
|
|
/// NOTE: we should check for remote_replica_path existence,
|
|
/// since otherwise DROP REPLICA will fail if the replica had been already removed.
|
|
if (!zookeeper->exists(remote_replica_path))
|
|
{
|
|
LOG_INFO(logger, "Removing replica {} does not exist", remote_replica_path);
|
|
return;
|
|
}
|
|
|
|
/// Analog of removeRecursive(remote_replica_path)
|
|
/// but it removes "metadata" firstly.
|
|
///
|
|
/// This will allow to mark table as readonly
|
|
/// and skip any checks of parts between on-disk and in the zookeeper.
|
|
///
|
|
/// Without this removeRecursive() may remove "parts" first
|
|
/// and on DETACH/ATTACH (or server restart) it will trigger the following error:
|
|
///
|
|
/// "The local set of parts of table X doesn't look like the set of parts in ZooKeeper"
|
|
///
|
|
{
|
|
Strings children = zookeeper->getChildren(remote_replica_path);
|
|
|
|
if (std::find(children.begin(), children.end(), "metadata") != children.end())
|
|
zookeeper->remove(fs::path(remote_replica_path) / "metadata");
|
|
|
|
for (const auto & child : children)
|
|
{
|
|
if (child != "metadata")
|
|
zookeeper->removeRecursive(fs::path(remote_replica_path) / child);
|
|
}
|
|
|
|
zookeeper->remove(remote_replica_path);
|
|
}
|
|
|
|
/// It may left some garbage if replica_path subtree are concurrently modified
|
|
if (zookeeper->exists(remote_replica_path))
|
|
LOG_ERROR(logger, "Replica was not completely removed from ZooKeeper, {} still exists and may contain some garbage.", remote_replica_path);
|
|
|
|
/// Check that `zookeeper_path` exists: it could have been deleted by another replica after execution of previous line.
|
|
Strings replicas;
|
|
if (Coordination::Error::ZOK != zookeeper->tryGetChildren(zookeeper_path + "/replicas", replicas) || !replicas.empty())
|
|
return;
|
|
|
|
LOG_INFO(logger, "{} is the last replica, will remove table", remote_replica_path);
|
|
|
|
/** At this moment, another replica can be created and we cannot remove the table.
|
|
* Try to remove /replicas node first. If we successfully removed it,
|
|
* it guarantees that we are the only replica that proceed to remove the table
|
|
* and no new replicas can be created after that moment (it requires the existence of /replicas node).
|
|
* and table cannot be recreated with new /replicas node on another servers while we are removing data,
|
|
* because table creation is executed in single transaction that will conflict with remaining nodes.
|
|
*/
|
|
|
|
/// Node /dropped works like a lock that protects from concurrent removal of old table and creation of new table.
|
|
/// But recursive removal may fail in the middle of operation leaving some garbage in zookeeper_path, so
|
|
/// we remove it on table creation if there is /dropped node. Creating thread may remove /dropped node created by
|
|
/// removing thread, and it causes race condition if removing thread is not finished yet.
|
|
/// To avoid this we also create ephemeral child before starting recursive removal.
|
|
/// (The existence of child node does not allow to remove parent node).
|
|
Coordination::Requests ops;
|
|
Coordination::Responses responses;
|
|
String drop_lock_path = zookeeper_path + "/dropped/lock";
|
|
ops.emplace_back(zkutil::makeRemoveRequest(zookeeper_path + "/replicas", -1));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/dropped", "", zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(drop_lock_path, "", zkutil::CreateMode::Ephemeral));
|
|
Coordination::Error code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZNONODE || code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_WARNING(logger, "Table {} is already started to be removing by another replica right now", remote_replica_path);
|
|
}
|
|
else if (code == Coordination::Error::ZNOTEMPTY)
|
|
{
|
|
LOG_WARNING(logger, "Another replica was suddenly created, will keep the table {}", remote_replica_path);
|
|
}
|
|
else if (code != Coordination::Error::ZOK)
|
|
{
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
else
|
|
{
|
|
auto metadata_drop_lock = zkutil::EphemeralNodeHolder::existing(drop_lock_path, *zookeeper);
|
|
LOG_INFO(logger, "Removing table {} (this might take several minutes)", zookeeper_path);
|
|
removeTableNodesFromZooKeeper(zookeeper, zookeeper_path, metadata_drop_lock, logger);
|
|
}
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::removeTableNodesFromZooKeeper(zkutil::ZooKeeperPtr zookeeper,
|
|
const String & zookeeper_path, const zkutil::EphemeralNodeHolder::Ptr & metadata_drop_lock, Poco::Logger * logger)
|
|
{
|
|
bool completely_removed = false;
|
|
Strings children;
|
|
Coordination::Error code = zookeeper->tryGetChildren(zookeeper_path, children);
|
|
if (code == Coordination::Error::ZNONODE)
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "There is a race condition between creation and removal of replicated table. It's a bug");
|
|
|
|
|
|
for (const auto & child : children)
|
|
if (child != "dropped")
|
|
zookeeper->tryRemoveRecursive(fs::path(zookeeper_path) / child);
|
|
|
|
Coordination::Requests ops;
|
|
Coordination::Responses responses;
|
|
ops.emplace_back(zkutil::makeRemoveRequest(metadata_drop_lock->getPath(), -1));
|
|
ops.emplace_back(zkutil::makeRemoveRequest(fs::path(zookeeper_path) / "dropped", -1));
|
|
ops.emplace_back(zkutil::makeRemoveRequest(zookeeper_path, -1));
|
|
code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZNONODE)
|
|
{
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "There is a race condition between creation and removal of replicated table. It's a bug");
|
|
}
|
|
else if (code == Coordination::Error::ZNOTEMPTY)
|
|
{
|
|
LOG_ERROR(logger, "Table was not completely removed from ZooKeeper, {} still exists and may contain some garbage,"
|
|
"but someone is removing it right now.", zookeeper_path);
|
|
}
|
|
else if (code != Coordination::Error::ZOK)
|
|
{
|
|
/// It is still possible that ZooKeeper session is expired or server is killed in the middle of the delete operation.
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
else
|
|
{
|
|
metadata_drop_lock->setAlreadyRemoved();
|
|
completely_removed = true;
|
|
LOG_INFO(logger, "Table {} was successfully removed from ZooKeeper", zookeeper_path);
|
|
}
|
|
|
|
return completely_removed;
|
|
}
|
|
|
|
|
|
/** Verify that list of columns and table storage_settings_ptr match those specified in ZK (/metadata).
|
|
* If not, throw an exception.
|
|
*/
|
|
void StorageReplicatedMergeTree::checkTableStructure(const String & zookeeper_prefix, const StorageMetadataPtr & metadata_snapshot)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
ReplicatedMergeTreeTableMetadata old_metadata(*this, metadata_snapshot);
|
|
|
|
Coordination::Stat metadata_stat;
|
|
String metadata_str = zookeeper->get(fs::path(zookeeper_prefix) / "metadata", &metadata_stat);
|
|
auto metadata_from_zk = ReplicatedMergeTreeTableMetadata::parse(metadata_str);
|
|
old_metadata.checkEquals(metadata_from_zk, metadata_snapshot->getColumns(), getContext());
|
|
|
|
Coordination::Stat columns_stat;
|
|
auto columns_from_zk = ColumnsDescription::parse(zookeeper->get(fs::path(zookeeper_prefix) / "columns", &columns_stat));
|
|
|
|
const ColumnsDescription & old_columns = metadata_snapshot->getColumns();
|
|
if (columns_from_zk != old_columns)
|
|
{
|
|
throw Exception(ErrorCodes::INCOMPATIBLE_COLUMNS,
|
|
"Table columns structure in ZooKeeper is different from local table structure. Local columns:\n"
|
|
"{}\nZookeeper columns:\n{}", old_columns.toString(), columns_from_zk.toString());
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::setTableStructure(
|
|
ColumnsDescription new_columns, const ReplicatedMergeTreeTableMetadata::Diff & metadata_diff)
|
|
{
|
|
StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
|
|
StorageInMemoryMetadata old_metadata = getInMemoryMetadata();
|
|
|
|
new_metadata.columns = new_columns;
|
|
|
|
if (!metadata_diff.empty())
|
|
{
|
|
auto parse_key_expr = [] (const String & key_expr)
|
|
{
|
|
ParserNotEmptyExpressionList parser(false);
|
|
auto new_sorting_key_expr_list = parseQuery(parser, key_expr, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
|
|
|
|
ASTPtr order_by_ast;
|
|
if (new_sorting_key_expr_list->children.size() == 1)
|
|
order_by_ast = new_sorting_key_expr_list->children[0];
|
|
else
|
|
{
|
|
auto tuple = makeASTFunction("tuple");
|
|
tuple->arguments->children = new_sorting_key_expr_list->children;
|
|
order_by_ast = tuple;
|
|
}
|
|
return order_by_ast;
|
|
};
|
|
|
|
if (metadata_diff.sorting_key_changed)
|
|
{
|
|
auto order_by_ast = parse_key_expr(metadata_diff.new_sorting_key);
|
|
auto & sorting_key = new_metadata.sorting_key;
|
|
auto & primary_key = new_metadata.primary_key;
|
|
|
|
sorting_key.recalculateWithNewAST(order_by_ast, new_metadata.columns, getContext());
|
|
|
|
if (primary_key.definition_ast == nullptr)
|
|
{
|
|
/// Primary and sorting key become independent after this ALTER so we have to
|
|
/// save the old ORDER BY expression as the new primary key.
|
|
auto old_sorting_key_ast = old_metadata.getSortingKey().definition_ast;
|
|
primary_key = KeyDescription::getKeyFromAST(
|
|
old_sorting_key_ast, new_metadata.columns, getContext());
|
|
}
|
|
}
|
|
|
|
if (metadata_diff.sampling_expression_changed)
|
|
{
|
|
if (!metadata_diff.new_sampling_expression.empty())
|
|
{
|
|
auto sample_by_ast = parse_key_expr(metadata_diff.new_sampling_expression);
|
|
new_metadata.sampling_key.recalculateWithNewAST(sample_by_ast, new_metadata.columns, getContext());
|
|
}
|
|
else /// SAMPLE BY was removed
|
|
{
|
|
new_metadata.sampling_key = {};
|
|
}
|
|
}
|
|
|
|
if (metadata_diff.skip_indices_changed)
|
|
new_metadata.secondary_indices = IndicesDescription::parse(metadata_diff.new_skip_indices, new_columns, getContext());
|
|
|
|
if (metadata_diff.constraints_changed)
|
|
new_metadata.constraints = ConstraintsDescription::parse(metadata_diff.new_constraints);
|
|
|
|
if (metadata_diff.projections_changed)
|
|
new_metadata.projections = ProjectionsDescription::parse(metadata_diff.new_projections, new_columns, getContext());
|
|
|
|
if (metadata_diff.ttl_table_changed)
|
|
{
|
|
if (!metadata_diff.new_ttl_table.empty())
|
|
{
|
|
ParserTTLExpressionList parser;
|
|
auto ttl_for_table_ast = parseQuery(parser, metadata_diff.new_ttl_table, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
|
|
new_metadata.table_ttl = TTLTableDescription::getTTLForTableFromAST(
|
|
ttl_for_table_ast, new_metadata.columns, getContext(), new_metadata.primary_key);
|
|
}
|
|
else /// TTL was removed
|
|
{
|
|
new_metadata.table_ttl = TTLTableDescription{};
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Changes in columns may affect following metadata fields
|
|
new_metadata.column_ttls_by_name.clear();
|
|
for (const auto & [name, ast] : new_metadata.columns.getColumnTTLs())
|
|
{
|
|
auto new_ttl_entry = TTLDescription::getTTLFromAST(ast, new_metadata.columns, getContext(), new_metadata.primary_key);
|
|
new_metadata.column_ttls_by_name[name] = new_ttl_entry;
|
|
}
|
|
|
|
if (new_metadata.partition_key.definition_ast != nullptr)
|
|
new_metadata.partition_key.recalculateWithNewColumns(new_metadata.columns, getContext());
|
|
|
|
if (!metadata_diff.sorting_key_changed) /// otherwise already updated
|
|
new_metadata.sorting_key.recalculateWithNewColumns(new_metadata.columns, getContext());
|
|
|
|
/// Primary key is special, it exists even if not defined
|
|
if (new_metadata.primary_key.definition_ast != nullptr)
|
|
{
|
|
new_metadata.primary_key.recalculateWithNewColumns(new_metadata.columns, getContext());
|
|
}
|
|
else
|
|
{
|
|
new_metadata.primary_key = KeyDescription::getKeyFromAST(new_metadata.sorting_key.definition_ast, new_metadata.columns, getContext());
|
|
new_metadata.primary_key.definition_ast = nullptr;
|
|
}
|
|
|
|
if (!metadata_diff.sampling_expression_changed && new_metadata.sampling_key.definition_ast != nullptr)
|
|
new_metadata.sampling_key.recalculateWithNewColumns(new_metadata.columns, getContext());
|
|
|
|
if (!metadata_diff.skip_indices_changed) /// otherwise already updated
|
|
{
|
|
for (auto & index : new_metadata.secondary_indices)
|
|
index.recalculateWithNewColumns(new_metadata.columns, getContext());
|
|
}
|
|
|
|
if (!metadata_diff.ttl_table_changed && new_metadata.table_ttl.definition_ast != nullptr)
|
|
new_metadata.table_ttl = TTLTableDescription::getTTLForTableFromAST(
|
|
new_metadata.table_ttl.definition_ast, new_metadata.columns, getContext(), new_metadata.primary_key);
|
|
|
|
/// Even if the primary/sorting/partition keys didn't change we must reinitialize it
|
|
/// because primary/partition key column types might have changed.
|
|
checkTTLExpressions(new_metadata, old_metadata);
|
|
setProperties(new_metadata, old_metadata);
|
|
|
|
auto table_id = getStorageID();
|
|
DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(getContext(), table_id, new_metadata);
|
|
}
|
|
|
|
|
|
/** If necessary, restore a part, replica itself adds a record for its receipt.
|
|
* What time should I put for this entry in the queue? Time is taken into account when calculating lag of replica.
|
|
* For these purposes, it makes sense to use creation time of missing part
|
|
* (that is, in calculating lag, it will be taken into account how old is the part we need to recover).
|
|
*/
|
|
static time_t tryGetPartCreateTime(zkutil::ZooKeeperPtr & zookeeper, const String & replica_path, const String & part_name)
|
|
{
|
|
time_t res = 0;
|
|
|
|
/// We get creation time of part, if it still exists (was not merged, for example).
|
|
Coordination::Stat stat;
|
|
String unused;
|
|
if (zookeeper->tryGet(fs::path(replica_path) / "parts" / part_name, unused, &stat))
|
|
res = stat.ctime / 1000;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::checkParts(bool skip_sanity_checks)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
Strings expected_parts_vec = zookeeper->getChildren(fs::path(replica_path) / "parts");
|
|
|
|
/// Parts in ZK.
|
|
NameSet expected_parts(expected_parts_vec.begin(), expected_parts_vec.end());
|
|
|
|
/// There are no PreActive parts at startup.
|
|
auto parts = getDataParts({MergeTreeDataPartState::Active, MergeTreeDataPartState::Outdated});
|
|
|
|
/** Local parts that are not in ZK.
|
|
* In very rare cases they may cover missing parts
|
|
* and someone may think that pushing them to zookeeper is good idea.
|
|
* But actually we can't precisely determine that ALL missing parts
|
|
* covered by this unexpected part. So missing parts will be downloaded.
|
|
*/
|
|
DataParts unexpected_parts;
|
|
|
|
/// Collect unexpected parts
|
|
for (const auto & part : parts)
|
|
if (!expected_parts.count(part->name))
|
|
unexpected_parts.insert(part); /// this parts we will place to detached with ignored_ prefix
|
|
|
|
/// Which parts should be taken from other replicas.
|
|
Strings parts_to_fetch;
|
|
|
|
for (const String & missing_name : expected_parts)
|
|
if (!getActiveContainingPart(missing_name))
|
|
parts_to_fetch.push_back(missing_name);
|
|
|
|
/** To check the adequacy, for the parts that are in the FS, but not in ZK, we will only consider not the most recent parts.
|
|
* Because unexpected new parts usually arise only because they did not have time to enroll in ZK with a rough restart of the server.
|
|
* It also occurs from deduplicated parts that did not have time to retire.
|
|
*/
|
|
size_t unexpected_parts_nonnew = 0;
|
|
UInt64 unexpected_parts_nonnew_rows = 0;
|
|
UInt64 unexpected_parts_rows = 0;
|
|
|
|
for (const auto & part : unexpected_parts)
|
|
{
|
|
if (part->info.level > 0)
|
|
{
|
|
++unexpected_parts_nonnew;
|
|
unexpected_parts_nonnew_rows += part->rows_count;
|
|
}
|
|
|
|
unexpected_parts_rows += part->rows_count;
|
|
}
|
|
|
|
const UInt64 parts_to_fetch_blocks = std::accumulate(parts_to_fetch.cbegin(), parts_to_fetch.cend(), 0,
|
|
[&](UInt64 acc, const String& part_name)
|
|
{
|
|
if (const auto part_info = MergeTreePartInfo::tryParsePartName(part_name, format_version))
|
|
return acc + part_info->getBlocksCount();
|
|
|
|
LOG_ERROR(log, "Unexpected part name: {}", part_name);
|
|
return acc;
|
|
});
|
|
|
|
/** We can automatically synchronize data,
|
|
* if the ratio of the total number of errors to the total number of parts (minimum - on the local filesystem or in ZK)
|
|
* is no more than some threshold (for example 50%).
|
|
*
|
|
* A large ratio of mismatches in the data on the filesystem and the expected data
|
|
* may indicate a configuration error (the server accidentally connected as a replica not from right shard).
|
|
* In this case, the protection mechanism does not allow the server to start.
|
|
*/
|
|
|
|
UInt64 total_rows_on_filesystem = 0;
|
|
for (const auto & part : parts)
|
|
total_rows_on_filesystem += part->rows_count;
|
|
|
|
const auto storage_settings_ptr = getSettings();
|
|
bool insane = unexpected_parts_rows > total_rows_on_filesystem * storage_settings_ptr->replicated_max_ratio_of_wrong_parts;
|
|
|
|
constexpr const char * sanity_report_fmt = "The local set of parts of table {} doesn't look like the set of parts in ZooKeeper: "
|
|
"{} rows of {} total rows in filesystem are suspicious. "
|
|
"There are {} unexpected parts with {} rows ({} of them is not just-written with {} rows), "
|
|
"{} missing parts (with {} blocks).";
|
|
|
|
if (insane && !skip_sanity_checks)
|
|
{
|
|
throw Exception(ErrorCodes::TOO_MANY_UNEXPECTED_DATA_PARTS, sanity_report_fmt, getStorageID().getNameForLogs(),
|
|
formatReadableQuantity(unexpected_parts_rows), formatReadableQuantity(total_rows_on_filesystem),
|
|
unexpected_parts.size(), unexpected_parts_rows, unexpected_parts_nonnew, unexpected_parts_nonnew_rows,
|
|
parts_to_fetch.size(), parts_to_fetch_blocks);
|
|
}
|
|
|
|
if (unexpected_parts_nonnew_rows > 0)
|
|
{
|
|
LOG_WARNING(log, fmt::runtime(sanity_report_fmt), getStorageID().getNameForLogs(),
|
|
formatReadableQuantity(unexpected_parts_rows), formatReadableQuantity(total_rows_on_filesystem),
|
|
unexpected_parts.size(), unexpected_parts_rows, unexpected_parts_nonnew, unexpected_parts_nonnew_rows,
|
|
parts_to_fetch.size(), parts_to_fetch_blocks);
|
|
}
|
|
|
|
/// Add to the queue jobs to pick up the missing parts from other replicas and remove from ZK the information that we have them.
|
|
queue.setBrokenPartsToEnqueueFetchesOnLoading(std::move(parts_to_fetch));
|
|
|
|
/// Remove extra local parts.
|
|
for (const DataPartPtr & part : unexpected_parts)
|
|
{
|
|
LOG_ERROR(log, "Renaming unexpected part {} to ignored_{}", part->name, part->name);
|
|
forgetPartAndMoveToDetached(part, "ignored", true);
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::syncPinnedPartUUIDs()
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
Coordination::Stat stat;
|
|
String s = zookeeper->get(zookeeper_path + "/pinned_part_uuids", &stat);
|
|
|
|
std::lock_guard lock(pinned_part_uuids_mutex);
|
|
|
|
/// Unsure whether or not this can be called concurrently.
|
|
if (pinned_part_uuids->stat.version < stat.version)
|
|
{
|
|
auto new_pinned_part_uuids = std::make_shared<PinnedPartUUIDs>();
|
|
new_pinned_part_uuids->fromString(s);
|
|
new_pinned_part_uuids->stat = stat;
|
|
|
|
pinned_part_uuids = new_pinned_part_uuids;
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::checkPartChecksumsAndAddCommitOps(const zkutil::ZooKeeperPtr & zookeeper,
|
|
const DataPartPtr & part, Coordination::Requests & ops, String part_name, NameSet * absent_replicas_paths)
|
|
{
|
|
if (part_name.empty())
|
|
part_name = part->name;
|
|
|
|
auto local_part_header = ReplicatedMergeTreePartHeader::fromColumnsAndChecksums(
|
|
part->getColumns(), part->checksums);
|
|
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
std::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
|
|
bool has_been_already_added = false;
|
|
|
|
for (const String & replica : replicas)
|
|
{
|
|
String current_part_path = fs::path(zookeeper_path) / "replicas" / replica / "parts" / part_name;
|
|
|
|
String part_zk_str;
|
|
if (!zookeeper->tryGet(current_part_path, part_zk_str))
|
|
{
|
|
if (absent_replicas_paths)
|
|
absent_replicas_paths->emplace(current_part_path);
|
|
|
|
continue;
|
|
}
|
|
|
|
ReplicatedMergeTreePartHeader replica_part_header;
|
|
if (part_zk_str.empty())
|
|
{
|
|
String columns_str;
|
|
String checksums_str;
|
|
|
|
if (zookeeper->tryGet(fs::path(current_part_path) / "columns", columns_str) &&
|
|
zookeeper->tryGet(fs::path(current_part_path) / "checksums", checksums_str))
|
|
{
|
|
replica_part_header = ReplicatedMergeTreePartHeader::fromColumnsAndChecksumsZNodes(columns_str, checksums_str);
|
|
}
|
|
else
|
|
{
|
|
if (zookeeper->exists(current_part_path))
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Part {} has empty header and does not have columns and checksums. "
|
|
"Looks like a bug.", current_part_path);
|
|
LOG_INFO(log, "Not checking checksums of part {} with replica {} because part was removed from ZooKeeper", part_name, replica);
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
replica_part_header = ReplicatedMergeTreePartHeader::fromString(part_zk_str);
|
|
}
|
|
|
|
if (replica_part_header.getColumnsHash() != local_part_header.getColumnsHash())
|
|
{
|
|
/// Currently there are two (known) cases when it may happen:
|
|
/// - KILL MUTATION query had removed mutation before all replicas have executed assigned MUTATE_PART entries.
|
|
/// Some replicas may skip this mutation and update part version without actually applying any changes.
|
|
/// It leads to mismatching checksum if changes were applied on other replicas.
|
|
/// - ALTER_METADATA and MERGE_PARTS were reordered on some replicas.
|
|
/// It may lead to different number of columns in merged parts on these replicas.
|
|
throw Exception(ErrorCodes::CHECKSUM_DOESNT_MATCH, "Part {} from {} has different columns hash "
|
|
"(it may rarely happen on race condition with KILL MUTATION or ALTER COLUMN).", part_name, replica);
|
|
}
|
|
|
|
replica_part_header.getChecksums().checkEqual(local_part_header.getChecksums(), true);
|
|
|
|
if (replica == replica_name)
|
|
has_been_already_added = true;
|
|
|
|
/// If we verify checksums in "sequential manner" (i.e. recheck absence of checksums on other replicas when commit)
|
|
/// then it is enough to verify checksums on at least one replica since checksums on other replicas must be the same.
|
|
if (absent_replicas_paths)
|
|
{
|
|
absent_replicas_paths->clear();
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!has_been_already_added)
|
|
{
|
|
const auto storage_settings_ptr = getSettings();
|
|
String part_path = fs::path(replica_path) / "parts" / part_name;
|
|
|
|
if (storage_settings_ptr->use_minimalistic_part_header_in_zookeeper)
|
|
{
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
part_path, local_part_header.toString(), zkutil::CreateMode::Persistent));
|
|
}
|
|
else
|
|
{
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
part_path, "", zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(part_path) / "columns", part->getColumns().toString(), zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(part_path) / "checksums", getChecksumsForZooKeeper(part->checksums), zkutil::CreateMode::Persistent));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LOG_WARNING(log, "checkPartAndAddToZooKeeper: node {} already exists. Will not commit any nodes.",
|
|
(fs::path(replica_path) / "parts" / part_name).string());
|
|
}
|
|
}
|
|
|
|
MergeTreeData::DataPartsVector StorageReplicatedMergeTree::checkPartChecksumsAndCommit(Transaction & transaction,
|
|
const DataPartPtr & part)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
while (true)
|
|
{
|
|
Coordination::Requests ops;
|
|
NameSet absent_part_paths_on_replicas;
|
|
|
|
/// Checksums are checked here and `ops` is filled. In fact, the part is added to ZK just below, when executing `multi`.
|
|
checkPartChecksumsAndAddCommitOps(zookeeper, part, ops, part->name, &absent_part_paths_on_replicas);
|
|
|
|
/// Do not commit if the part is obsolete, we have just briefly checked its checksums
|
|
if (transaction.isEmpty())
|
|
return {};
|
|
|
|
/// Will check that the part did not suddenly appear on skipped replicas
|
|
if (!absent_part_paths_on_replicas.empty())
|
|
{
|
|
Coordination::Requests new_ops;
|
|
for (const String & part_path : absent_part_paths_on_replicas)
|
|
{
|
|
/// NOTE Create request may fail with ZNONODE if replica is being dropped, we will throw an exception
|
|
new_ops.emplace_back(zkutil::makeCreateRequest(part_path, "", zkutil::CreateMode::Persistent));
|
|
new_ops.emplace_back(zkutil::makeRemoveRequest(part_path, -1));
|
|
}
|
|
|
|
/// Add check ops at the beginning
|
|
new_ops.insert(new_ops.end(), ops.begin(), ops.end());
|
|
ops = std::move(new_ops);
|
|
}
|
|
|
|
try
|
|
{
|
|
zookeeper->multi(ops);
|
|
return transaction.commit();
|
|
}
|
|
catch (const zkutil::KeeperMultiException & e)
|
|
{
|
|
size_t num_check_ops = 2 * absent_part_paths_on_replicas.size();
|
|
size_t failed_op_index = e.failed_op_index;
|
|
|
|
if (failed_op_index < num_check_ops && e.code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_INFO(log, "The part {} on a replica suddenly appeared, will recheck checksums", e.getPathForFirstFailedOp());
|
|
}
|
|
else
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
String StorageReplicatedMergeTree::getChecksumsForZooKeeper(const MergeTreeDataPartChecksums & checksums) const
|
|
{
|
|
return MinimalisticDataPartChecksums::getSerializedString(checksums,
|
|
getSettings()->use_minimalistic_checksums_in_zookeeper);
|
|
}
|
|
|
|
MergeTreeData::MutableDataPartPtr StorageReplicatedMergeTree::attachPartHelperFoundValidPart(const LogEntry& entry) const
|
|
{
|
|
const MergeTreePartInfo actual_part_info = MergeTreePartInfo::fromPartName(entry.new_part_name, format_version);
|
|
const String part_new_name = actual_part_info.getPartName();
|
|
|
|
for (const DiskPtr & disk : getStoragePolicy()->getDisks())
|
|
for (const auto it = disk->iterateDirectory(fs::path(relative_data_path) / "detached/"); it->isValid(); it->next())
|
|
{
|
|
const auto part_info = MergeTreePartInfo::tryParsePartName(it->name(), format_version);
|
|
|
|
if (!part_info || part_info->partition_id != actual_part_info.partition_id)
|
|
continue;
|
|
|
|
const String part_old_name = part_info->getPartName();
|
|
const String part_path = fs::path("detached") / part_old_name;
|
|
|
|
const VolumePtr volume = std::make_shared<SingleDiskVolume>("volume_" + part_old_name, disk);
|
|
|
|
/// actual_part_info is more recent than part_info so we use it
|
|
MergeTreeData::MutableDataPartPtr part = createPart(part_new_name, actual_part_info, volume, part_path);
|
|
|
|
try
|
|
{
|
|
part->loadColumnsChecksumsIndexes(true, true);
|
|
}
|
|
catch (const Exception&)
|
|
{
|
|
/// This method throws if the part data is corrupted or partly missing. In this case, we simply don't
|
|
/// process the part.
|
|
continue;
|
|
}
|
|
|
|
if (entry.part_checksum == part->checksums.getTotalChecksumHex())
|
|
{
|
|
part->modification_time = disk->getLastModified(part->getFullRelativePath()).epochTime();
|
|
return part;
|
|
}
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::executeLogEntry(LogEntry & entry)
|
|
{
|
|
if (entry.type == LogEntry::DROP_RANGE)
|
|
{
|
|
executeDropRange(entry);
|
|
return true;
|
|
}
|
|
|
|
if (entry.type == LogEntry::REPLACE_RANGE)
|
|
{
|
|
executeReplaceRange(entry);
|
|
return true;
|
|
}
|
|
|
|
const bool is_get_or_attach = entry.type == LogEntry::GET_PART || entry.type == LogEntry::ATTACH_PART;
|
|
|
|
if (is_get_or_attach || entry.type == LogEntry::MERGE_PARTS || entry.type == LogEntry::MUTATE_PART)
|
|
{
|
|
/// If we already have this part or a part covering it, we do not need to do anything.
|
|
/// The part may be still in the PreActive -> Active transition so we first search
|
|
/// among PreActive parts to definitely find the desired part if it exists.
|
|
DataPartPtr existing_part = getPartIfExists(entry.new_part_name, {MergeTreeDataPartState::PreActive});
|
|
|
|
if (!existing_part)
|
|
existing_part = getActiveContainingPart(entry.new_part_name);
|
|
|
|
/// Even if the part is local, it (in exceptional cases) may not be in ZooKeeper. Let's check that it is there.
|
|
if (existing_part && getZooKeeper()->exists(fs::path(replica_path) / "parts" / existing_part->name))
|
|
{
|
|
if (!is_get_or_attach || entry.source_replica != replica_name)
|
|
LOG_DEBUG(log, "Skipping action for part {} because part {} already exists.",
|
|
entry.new_part_name, existing_part->name);
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
if (entry.type == LogEntry::ATTACH_PART)
|
|
{
|
|
if (MutableDataPartPtr part = attachPartHelperFoundValidPart(entry); part)
|
|
{
|
|
LOG_TRACE(log, "Found valid local part for {}, preparing the transaction", part->name);
|
|
|
|
Transaction transaction(*this);
|
|
|
|
renameTempPartAndReplace(part, nullptr, &transaction);
|
|
checkPartChecksumsAndCommit(transaction, part);
|
|
|
|
writePartLog(PartLogElement::Type::NEW_PART, {}, 0 /** log entry is fake so we don't measure the time */,
|
|
part->name, part, {} /** log entry is fake so there are no initial parts */, nullptr);
|
|
|
|
return true;
|
|
}
|
|
|
|
LOG_TRACE(log, "Didn't find valid local part for {} ({}), will fetch it from other replica",
|
|
entry.new_part_name,
|
|
entry.actual_new_part_name);
|
|
}
|
|
|
|
if (is_get_or_attach && entry.source_replica == replica_name)
|
|
LOG_WARNING(log, "Part {} from own log doesn't exist.", entry.new_part_name);
|
|
|
|
/// Perhaps we don't need this part, because during write with quorum, the quorum has failed
|
|
/// (see below about `/quorum/failed_parts`).
|
|
if (entry.quorum && getZooKeeper()->exists(fs::path(zookeeper_path) / "quorum" / "failed_parts" / entry.new_part_name))
|
|
{
|
|
LOG_DEBUG(log, "Skipping action for part {} because quorum for that part was failed.", entry.new_part_name);
|
|
return true; /// NOTE Deletion from `virtual_parts` is not done, but it is only necessary for merge.
|
|
}
|
|
|
|
// bool do_fetch = false;
|
|
|
|
switch (entry.type)
|
|
{
|
|
case LogEntry::ATTACH_PART:
|
|
/// We surely don't have this part locally as we've checked it before, so download it.
|
|
[[fallthrough]];
|
|
case LogEntry::GET_PART:
|
|
return executeFetch(entry);
|
|
// do_fetch = true;
|
|
case LogEntry::MERGE_PARTS:
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Merge has to be executed by another function");
|
|
case LogEntry::MUTATE_PART:
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Mutation has to be executed by another function");
|
|
case LogEntry::ALTER_METADATA:
|
|
return executeMetadataAlter(entry);
|
|
case LogEntry::SYNC_PINNED_PART_UUIDS:
|
|
syncPinnedPartUUIDs();
|
|
return true;
|
|
case LogEntry::CLONE_PART_FROM_SHARD:
|
|
executeClonePartFromShard(entry);
|
|
return true;
|
|
default:
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Unexpected log entry type: {}", static_cast<int>(entry.type));
|
|
}
|
|
|
|
// return true;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::executeFetch(LogEntry & entry, bool need_to_check_missing_part)
|
|
{
|
|
/// Looking for covering part. After that entry.actual_new_part_name may be filled.
|
|
String replica = findReplicaHavingCoveringPart(entry, true);
|
|
const auto storage_settings_ptr = getSettings();
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
try
|
|
{
|
|
if (replica.empty())
|
|
{
|
|
/** If a part is to be written with a quorum and the quorum is not reached yet,
|
|
* then (due to the fact that a part is impossible to download right now),
|
|
* the quorum entry should be considered unsuccessful.
|
|
* TODO Complex code, extract separately.
|
|
*/
|
|
if (entry.quorum)
|
|
{
|
|
if (entry.type != LogEntry::GET_PART)
|
|
throw Exception("Logical error: log entry with quorum but type is not GET_PART", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
LOG_DEBUG(log, "No active replica has part {} which needs to be written with quorum. Will try to mark that quorum as failed.", entry.new_part_name);
|
|
|
|
/** Atomically:
|
|
* - if replicas do not become active;
|
|
* - if there is a `quorum` node with this part;
|
|
* - delete `quorum` node;
|
|
* - add a part to the list `quorum/failed_parts`;
|
|
* - if the part is not already removed from the list for deduplication `blocks/block_num`, then delete it;
|
|
*
|
|
* If something changes, then we will nothing - we'll get here again next time.
|
|
*/
|
|
|
|
/** We collect the `host` node versions from the replicas.
|
|
* When the replica becomes active, it changes the value of host in the same transaction (with the creation of `is_active`).
|
|
* This will ensure that the replicas do not become active.
|
|
*/
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
|
|
Coordination::Requests ops;
|
|
|
|
for (const auto & path_part : replicas)
|
|
{
|
|
Coordination::Stat stat;
|
|
String path = fs::path(zookeeper_path) / "replicas" / path_part / "host";
|
|
zookeeper->get(path, &stat);
|
|
ops.emplace_back(zkutil::makeCheckRequest(path, stat.version));
|
|
}
|
|
|
|
/// We verify that while we were collecting versions, the replica with the necessary part did not come alive.
|
|
replica = findReplicaHavingPart(entry.new_part_name, true);
|
|
|
|
/// Also during this time a completely new replica could be created.
|
|
/// But if a part does not appear on the old, then it can not be on the new one either.
|
|
|
|
if (replica.empty())
|
|
{
|
|
Coordination::Stat quorum_stat;
|
|
const String quorum_unparallel_path = fs::path(zookeeper_path) / "quorum" / "status";
|
|
const String quorum_parallel_path = fs::path(zookeeper_path) / "quorum" / "parallel" / entry.new_part_name;
|
|
String quorum_str, quorum_path;
|
|
ReplicatedMergeTreeQuorumEntry quorum_entry;
|
|
|
|
if (zookeeper->tryGet(quorum_unparallel_path, quorum_str, &quorum_stat))
|
|
quorum_path = quorum_unparallel_path;
|
|
else
|
|
{
|
|
quorum_str = zookeeper->get(quorum_parallel_path, &quorum_stat);
|
|
quorum_path = quorum_parallel_path;
|
|
}
|
|
|
|
quorum_entry.fromString(quorum_str);
|
|
|
|
if (quorum_entry.part_name == entry.new_part_name)
|
|
{
|
|
ops.emplace_back(zkutil::makeRemoveRequest(quorum_path, quorum_stat.version));
|
|
auto part_info = MergeTreePartInfo::fromPartName(entry.new_part_name, format_version);
|
|
|
|
if (part_info.min_block != part_info.max_block)
|
|
throw Exception("Logical error: log entry with quorum for part covering more than one block number",
|
|
ErrorCodes::LOGICAL_ERROR);
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(zookeeper_path) / "quorum" / "failed_parts" / entry.new_part_name,
|
|
"",
|
|
zkutil::CreateMode::Persistent));
|
|
|
|
/// Deleting from `blocks`.
|
|
if (!entry.block_id.empty() && zookeeper->exists(fs::path(zookeeper_path) / "blocks" / entry.block_id))
|
|
ops.emplace_back(zkutil::makeRemoveRequest(fs::path(zookeeper_path) / "blocks" / entry.block_id, -1));
|
|
|
|
Coordination::Responses responses;
|
|
auto code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZOK)
|
|
{
|
|
LOG_DEBUG(log, "Marked quorum for part {} as failed.", entry.new_part_name);
|
|
queue.removeFailedQuorumPart(part_info);
|
|
return true;
|
|
}
|
|
else if (code == Coordination::Error::ZBADVERSION || code == Coordination::Error::ZNONODE || code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "State was changed or isn't expected when trying to mark quorum for part {} as failed. Code: {}",
|
|
entry.new_part_name, Coordination::errorMessage(code));
|
|
}
|
|
else
|
|
throw Coordination::Exception(code);
|
|
}
|
|
else
|
|
{
|
|
LOG_WARNING(log, "No active replica has part {}, "
|
|
"but that part needs quorum and /quorum/status contains entry about another part {}. "
|
|
"It means that part was successfully written to {} replicas, but then all of them goes offline. "
|
|
"Or it is a bug.", entry.new_part_name, quorum_entry.part_name, entry.quorum);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (replica.empty())
|
|
{
|
|
ProfileEvents::increment(ProfileEvents::ReplicatedPartFailedFetches);
|
|
|
|
if (!need_to_check_missing_part)
|
|
return false;
|
|
|
|
throw Exception("No active replica has part " + entry.new_part_name + " or covering part", ErrorCodes::NO_REPLICA_HAS_PART);
|
|
}
|
|
}
|
|
|
|
try
|
|
{
|
|
String part_name = entry.actual_new_part_name.empty() ? entry.new_part_name : entry.actual_new_part_name;
|
|
|
|
if (!entry.actual_new_part_name.empty())
|
|
LOG_DEBUG(log, "Will fetch part {} instead of {}", entry.actual_new_part_name, entry.new_part_name);
|
|
|
|
if (!fetchPart(part_name, metadata_snapshot, fs::path(zookeeper_path) / "replicas" / replica, false, entry.quorum))
|
|
return false;
|
|
}
|
|
catch (Exception & e)
|
|
{
|
|
/// No stacktrace, just log message
|
|
if (e.code() == ErrorCodes::RECEIVED_ERROR_TOO_MANY_REQUESTS)
|
|
e.addMessage("Too busy replica. Will try later.");
|
|
throw;
|
|
}
|
|
|
|
if (entry.type == LogEntry::MERGE_PARTS)
|
|
ProfileEvents::increment(ProfileEvents::ReplicatedPartFetchesOfMerged);
|
|
}
|
|
catch (...)
|
|
{
|
|
/** If we can not download the part we need for some merge, it's better not to try to get other parts for this merge,
|
|
* but try to get already merged part. To do this, move the action to get the remaining parts
|
|
* for this merge at the end of the queue.
|
|
*/
|
|
try
|
|
{
|
|
auto parts_for_merge = queue.moveSiblingPartsForMergeToEndOfQueue(entry.new_part_name);
|
|
|
|
if (!parts_for_merge.empty() && replica.empty())
|
|
{
|
|
LOG_INFO(log, "No active replica has part {}. Will fetch merged part instead.", entry.new_part_name);
|
|
/// We should enqueue it for check, because merged part may never appear if source part is lost
|
|
enqueuePartForCheck(entry.new_part_name);
|
|
return false;
|
|
}
|
|
|
|
/** If no active replica has a part, and there is no merge in the queue with its participation,
|
|
* check to see if any (active or inactive) replica has such a part or covering it.
|
|
*/
|
|
if (replica.empty())
|
|
enqueuePartForCheck(entry.new_part_name);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::executeFetchShared(
|
|
const String & source_replica,
|
|
const String & new_part_name,
|
|
const DiskPtr & disk,
|
|
const String & path)
|
|
{
|
|
if (source_replica.empty())
|
|
{
|
|
LOG_INFO(log, "No active replica has part {} on shared storage.", new_part_name);
|
|
return false;
|
|
}
|
|
|
|
const auto storage_settings_ptr = getSettings();
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
try
|
|
{
|
|
if (!fetchExistsPart(new_part_name, metadata_snapshot, fs::path(zookeeper_path) / "replicas" / source_replica, disk, path))
|
|
return false;
|
|
}
|
|
catch (Exception & e)
|
|
{
|
|
if (e.code() == ErrorCodes::RECEIVED_ERROR_TOO_MANY_REQUESTS)
|
|
e.addMessage("Too busy replica. Will try later.");
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
throw;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::executeDropRange(const LogEntry & entry)
|
|
{
|
|
LOG_TRACE(log, "Executing DROP_RANGE {}", entry.new_part_name);
|
|
auto drop_range_info = MergeTreePartInfo::fromPartName(entry.new_part_name, format_version);
|
|
getContext()->getMergeList().cancelInPartition(getStorageID(), drop_range_info.partition_id, drop_range_info.max_block);
|
|
part_check_thread.cancelRemovedPartsCheck(drop_range_info);
|
|
queue.removePartProducingOpsInRange(getZooKeeper(), drop_range_info, entry);
|
|
|
|
/// Delete the parts contained in the range to be deleted.
|
|
/// It's important that no old parts remain (after the merge), because otherwise,
|
|
/// after adding a new replica, this new replica downloads them, but does not delete them.
|
|
/// And, if you do not, the parts will come to life after the server is restarted.
|
|
/// Therefore, we use all data parts.
|
|
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
DataPartsVector parts_to_remove;
|
|
{
|
|
auto data_parts_lock = lockParts();
|
|
parts_to_remove = removePartsInRangeFromWorkingSet(drop_range_info, true, data_parts_lock);
|
|
if (parts_to_remove.empty())
|
|
{
|
|
if (!drop_range_info.isFakeDropRangePart())
|
|
LOG_INFO(log, "Log entry {} tried to drop single part {}, but part does not exist", entry.znode_name, entry.new_part_name);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (entry.detach)
|
|
LOG_DEBUG(log, "Detaching parts.");
|
|
else
|
|
LOG_DEBUG(log, "Removing parts.");
|
|
|
|
if (entry.detach)
|
|
{
|
|
/// If DETACH clone parts to detached/ directory
|
|
for (const auto & part : parts_to_remove)
|
|
{
|
|
LOG_INFO(log, "Detaching {}", part->relative_path);
|
|
part->makeCloneInDetached("", metadata_snapshot);
|
|
}
|
|
}
|
|
|
|
/// Forcibly remove parts from ZooKeeper
|
|
removePartsFromZooKeeperWithRetries(parts_to_remove);
|
|
|
|
if (entry.detach)
|
|
LOG_DEBUG(log, "Detached {} parts inside {}.", parts_to_remove.size(), entry.new_part_name);
|
|
else
|
|
LOG_DEBUG(log, "Removed {} parts inside {}.", parts_to_remove.size(), entry.new_part_name);
|
|
|
|
/// We want to remove dropped parts from disk as soon as possible
|
|
/// To be removed a partition should have zero refcount, therefore call the cleanup thread at exit
|
|
parts_to_remove.clear();
|
|
cleanup_thread.wakeup();
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::executeReplaceRange(const LogEntry & entry)
|
|
{
|
|
Stopwatch watch;
|
|
auto & entry_replace = *entry.replace_range_entry;
|
|
LOG_DEBUG(log, "Executing log entry {} to replace parts range {} with {} parts from {}.{}",
|
|
entry.znode_name, entry_replace.drop_range_part_name, entry_replace.new_part_names.size(),
|
|
entry_replace.from_database, entry_replace.from_table);
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
MergeTreePartInfo drop_range = MergeTreePartInfo::fromPartName(entry_replace.drop_range_part_name, format_version);
|
|
/// Range with only one block has special meaning: it's ATTACH PARTITION or MOVE PARTITION, so there is no drop range
|
|
bool replace = !LogEntry::ReplaceRangeEntry::isMovePartitionOrAttachFrom(drop_range);
|
|
|
|
if (replace)
|
|
{
|
|
getContext()->getMergeList().cancelInPartition(getStorageID(), drop_range.partition_id, drop_range.max_block);
|
|
part_check_thread.cancelRemovedPartsCheck(drop_range);
|
|
queue.removePartProducingOpsInRange(getZooKeeper(), drop_range, entry);
|
|
}
|
|
else
|
|
{
|
|
drop_range = {};
|
|
}
|
|
|
|
struct PartDescription
|
|
{
|
|
PartDescription(
|
|
size_t index_,
|
|
const String & src_part_name_,
|
|
const String & new_part_name_,
|
|
const String & checksum_hex_,
|
|
MergeTreeDataFormatVersion format_version)
|
|
: index(index_)
|
|
, src_part_name(src_part_name_)
|
|
, src_part_info(MergeTreePartInfo::fromPartName(src_part_name_, format_version))
|
|
, new_part_name(new_part_name_)
|
|
, new_part_info(MergeTreePartInfo::fromPartName(new_part_name_, format_version))
|
|
, checksum_hex(checksum_hex_)
|
|
{
|
|
}
|
|
|
|
size_t index; // in log entry arrays
|
|
String src_part_name;
|
|
MergeTreePartInfo src_part_info;
|
|
String new_part_name;
|
|
MergeTreePartInfo new_part_info;
|
|
String checksum_hex;
|
|
|
|
/// Part which will be committed
|
|
MutableDataPartPtr res_part;
|
|
|
|
/// We could find a covering part
|
|
MergeTreePartInfo found_new_part_info;
|
|
String found_new_part_name;
|
|
|
|
/// Hold pointer to part in source table if will clone it from local table
|
|
DataPartPtr src_table_part;
|
|
|
|
/// A replica that will be used to fetch part
|
|
String replica;
|
|
};
|
|
|
|
using PartDescriptionPtr = std::shared_ptr<PartDescription>;
|
|
using PartDescriptions = std::vector<PartDescriptionPtr>;
|
|
|
|
PartDescriptions all_parts;
|
|
PartDescriptions parts_to_add;
|
|
DataPartsVector parts_to_remove;
|
|
|
|
auto table_lock_holder_dst_table = lockForShare(
|
|
RWLockImpl::NO_QUERY, getSettings()->lock_acquire_timeout_for_background_operations);
|
|
auto dst_metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
for (size_t i = 0; i < entry_replace.new_part_names.size(); ++i)
|
|
{
|
|
all_parts.emplace_back(std::make_shared<PartDescription>(i,
|
|
entry_replace.src_part_names.at(i),
|
|
entry_replace.new_part_names.at(i),
|
|
entry_replace.part_names_checksums.at(i),
|
|
format_version));
|
|
}
|
|
|
|
/// What parts we should add? Or we have already added all required parts (we an replica-initializer)
|
|
{
|
|
auto data_parts_lock = lockParts();
|
|
|
|
for (const PartDescriptionPtr & part_desc : all_parts)
|
|
{
|
|
if (!getActiveContainingPart(part_desc->new_part_info, MergeTreeDataPartState::Active, data_parts_lock))
|
|
parts_to_add.emplace_back(part_desc);
|
|
}
|
|
|
|
if (parts_to_add.empty() && replace)
|
|
{
|
|
parts_to_remove = removePartsInRangeFromWorkingSet(drop_range, true, data_parts_lock);
|
|
String parts_to_remove_str;
|
|
for (const auto & part : parts_to_remove)
|
|
{
|
|
parts_to_remove_str += part->name;
|
|
parts_to_remove_str += " ";
|
|
}
|
|
LOG_TRACE(log, "Replacing {} parts {}with empty set", parts_to_remove.size(), parts_to_remove_str);
|
|
}
|
|
}
|
|
|
|
if (parts_to_add.empty())
|
|
{
|
|
LOG_INFO(log, "All parts from REPLACE PARTITION command have been already attached");
|
|
removePartsFromZooKeeperWithRetries(parts_to_remove);
|
|
return true;
|
|
}
|
|
|
|
if (parts_to_add.size() < all_parts.size())
|
|
{
|
|
LOG_WARNING(log, "Some (but not all) parts from REPLACE PARTITION command already exist. REPLACE PARTITION will not be atomic.");
|
|
}
|
|
|
|
StoragePtr source_table;
|
|
TableLockHolder table_lock_holder_src_table;
|
|
StorageID source_table_id{entry_replace.from_database, entry_replace.from_table};
|
|
|
|
auto clone_data_parts_from_source_table = [&] () -> size_t
|
|
{
|
|
source_table = DatabaseCatalog::instance().tryGetTable(source_table_id, getContext());
|
|
if (!source_table)
|
|
{
|
|
LOG_DEBUG(log, "Can't use {} as source table for REPLACE PARTITION command. It does not exist.", source_table_id.getNameForLogs());
|
|
return 0;
|
|
}
|
|
|
|
auto src_metadata_snapshot = source_table->getInMemoryMetadataPtr();
|
|
MergeTreeData * src_data = nullptr;
|
|
try
|
|
{
|
|
src_data = &checkStructureAndGetMergeTreeData(source_table, src_metadata_snapshot, dst_metadata_snapshot);
|
|
}
|
|
catch (Exception &)
|
|
{
|
|
LOG_INFO(log, "Can't use {} as source table for REPLACE PARTITION command. Will fetch all parts. Reason: {}", source_table_id.getNameForLogs(), getCurrentExceptionMessage(false));
|
|
return 0;
|
|
}
|
|
|
|
table_lock_holder_src_table = source_table->lockForShare(
|
|
RWLockImpl::NO_QUERY, getSettings()->lock_acquire_timeout_for_background_operations);
|
|
|
|
DataPartStates valid_states{
|
|
MergeTreeDataPartState::PreActive, MergeTreeDataPartState::Active, MergeTreeDataPartState::Outdated};
|
|
|
|
size_t num_clonable_parts = 0;
|
|
for (PartDescriptionPtr & part_desc : parts_to_add)
|
|
{
|
|
auto src_part = src_data->getPartIfExists(part_desc->src_part_info, valid_states);
|
|
if (!src_part)
|
|
{
|
|
LOG_DEBUG(log, "There is no part {} in {}", part_desc->src_part_name, source_table_id.getNameForLogs());
|
|
continue;
|
|
}
|
|
|
|
String checksum_hex = src_part->checksums.getTotalChecksumHex();
|
|
|
|
if (checksum_hex != part_desc->checksum_hex)
|
|
{
|
|
LOG_DEBUG(log, "Part {} of {} has inappropriate checksum", part_desc->src_part_name, source_table_id.getNameForLogs());
|
|
/// TODO: check version
|
|
continue;
|
|
}
|
|
|
|
part_desc->found_new_part_name = part_desc->new_part_name;
|
|
part_desc->found_new_part_info = part_desc->new_part_info;
|
|
part_desc->src_table_part = src_part;
|
|
|
|
++num_clonable_parts;
|
|
}
|
|
|
|
return num_clonable_parts;
|
|
};
|
|
|
|
size_t num_clonable_parts = clone_data_parts_from_source_table();
|
|
LOG_DEBUG(log, "Found {} parts that could be cloned (of {} required parts)", num_clonable_parts, parts_to_add.size());
|
|
|
|
ActiveDataPartSet adding_parts_active_set(format_version);
|
|
std::unordered_map<String, PartDescriptionPtr> part_name_to_desc;
|
|
|
|
for (PartDescriptionPtr & part_desc : parts_to_add)
|
|
{
|
|
if (part_desc->src_table_part)
|
|
{
|
|
/// It is clonable part
|
|
adding_parts_active_set.add(part_desc->new_part_name);
|
|
part_name_to_desc.emplace(part_desc->new_part_name, part_desc);
|
|
continue;
|
|
}
|
|
|
|
/// Firstly, try find exact part to produce more accurate part set
|
|
String replica = findReplicaHavingPart(part_desc->new_part_name, true);
|
|
String found_part_name;
|
|
/// TODO: check version
|
|
|
|
if (replica.empty())
|
|
{
|
|
LOG_DEBUG(log, "Part {} is not found on remote replicas", part_desc->new_part_name);
|
|
|
|
/// Fallback to covering part
|
|
replica = findReplicaHavingCoveringPart(part_desc->new_part_name, true, found_part_name);
|
|
|
|
if (replica.empty())
|
|
{
|
|
/// It is not fail, since adjacent parts could cover current part
|
|
LOG_DEBUG(log, "Parts covering {} are not found on remote replicas", part_desc->new_part_name);
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
found_part_name = part_desc->new_part_name;
|
|
}
|
|
|
|
part_desc->found_new_part_name = found_part_name;
|
|
part_desc->found_new_part_info = MergeTreePartInfo::fromPartName(found_part_name, format_version);
|
|
part_desc->replica = replica;
|
|
|
|
adding_parts_active_set.add(part_desc->found_new_part_name);
|
|
part_name_to_desc.emplace(part_desc->found_new_part_name, part_desc);
|
|
}
|
|
|
|
/// Check that we could cover whole range
|
|
for (PartDescriptionPtr & part_desc : parts_to_add)
|
|
{
|
|
if (adding_parts_active_set.getContainingPart(part_desc->new_part_info).empty())
|
|
{
|
|
throw Exception("Not found part " + part_desc->new_part_name +
|
|
" (or part covering it) neither source table neither remote replicas" , ErrorCodes::NO_REPLICA_HAS_PART);
|
|
}
|
|
}
|
|
|
|
/// Filter covered parts
|
|
PartDescriptions final_parts;
|
|
Strings final_part_names;
|
|
{
|
|
final_part_names = adding_parts_active_set.getParts();
|
|
|
|
for (const String & final_part_name : final_part_names)
|
|
{
|
|
auto part_desc = part_name_to_desc[final_part_name];
|
|
if (!part_desc)
|
|
throw Exception("There is no final part " + final_part_name + ". This is a bug", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
final_parts.emplace_back(part_desc);
|
|
|
|
if (final_parts.size() > 1)
|
|
{
|
|
auto & prev = *final_parts[final_parts.size() - 2];
|
|
auto & curr = *final_parts[final_parts.size() - 1];
|
|
|
|
if (!prev.found_new_part_info.isDisjoint(curr.found_new_part_info))
|
|
{
|
|
throw Exception("Intersected final parts detected: " + prev.found_new_part_name
|
|
+ " and " + curr.found_new_part_name + ". It should be investigated.", ErrorCodes::LOGICAL_ERROR);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static const String TMP_PREFIX = "tmp_replace_from_";
|
|
|
|
auto obtain_part = [&] (PartDescriptionPtr & part_desc)
|
|
{
|
|
if (part_desc->src_table_part)
|
|
{
|
|
|
|
if (part_desc->checksum_hex != part_desc->src_table_part->checksums.getTotalChecksumHex())
|
|
throw Exception("Checksums of " + part_desc->src_table_part->name + " is suddenly changed", ErrorCodes::UNFINISHED);
|
|
|
|
part_desc->res_part = cloneAndLoadDataPartOnSameDisk(
|
|
part_desc->src_table_part, TMP_PREFIX + "clone_", part_desc->new_part_info, metadata_snapshot);
|
|
}
|
|
else if (!part_desc->replica.empty())
|
|
{
|
|
String source_replica_path = fs::path(zookeeper_path) / "replicas" / part_desc->replica;
|
|
ReplicatedMergeTreeAddress address(getZooKeeper()->get(fs::path(source_replica_path) / "host"));
|
|
auto timeouts = getFetchPartHTTPTimeouts(getContext());
|
|
|
|
auto credentials = getContext()->getInterserverCredentials();
|
|
String interserver_scheme = getContext()->getInterserverScheme();
|
|
|
|
if (interserver_scheme != address.scheme)
|
|
throw Exception("Interserver schemas are different '" + interserver_scheme + "' != '" + address.scheme + "', can't fetch part from " + address.host, ErrorCodes::LOGICAL_ERROR);
|
|
|
|
part_desc->res_part = fetcher.fetchPart(
|
|
metadata_snapshot, getContext(), part_desc->found_new_part_name, source_replica_path,
|
|
address.host, address.replication_port, timeouts, credentials->getUser(), credentials->getPassword(),
|
|
interserver_scheme, replicated_fetches_throttler, false, TMP_PREFIX + "fetch_");
|
|
|
|
/// TODO: check columns_version of fetched part
|
|
|
|
ProfileEvents::increment(ProfileEvents::ReplicatedPartFetches);
|
|
}
|
|
else
|
|
throw Exception("There is no receipt to produce part " + part_desc->new_part_name + ". This is bug", ErrorCodes::LOGICAL_ERROR);
|
|
};
|
|
|
|
/// Download or clone parts
|
|
/// TODO: make it in parallel
|
|
for (PartDescriptionPtr & part_desc : final_parts)
|
|
obtain_part(part_desc);
|
|
|
|
MutableDataPartsVector res_parts;
|
|
for (PartDescriptionPtr & part_desc : final_parts)
|
|
res_parts.emplace_back(part_desc->res_part);
|
|
|
|
try
|
|
{
|
|
/// Commit parts
|
|
auto zookeeper = getZooKeeper();
|
|
Transaction transaction(*this);
|
|
|
|
Coordination::Requests ops;
|
|
for (PartDescriptionPtr & part_desc : final_parts)
|
|
{
|
|
renameTempPartAndReplace(part_desc->res_part, nullptr, &transaction);
|
|
getCommitPartOps(ops, part_desc->res_part);
|
|
}
|
|
|
|
if (!ops.empty())
|
|
zookeeper->multi(ops);
|
|
|
|
{
|
|
auto data_parts_lock = lockParts();
|
|
|
|
transaction.commit(&data_parts_lock);
|
|
if (replace)
|
|
{
|
|
parts_to_remove = removePartsInRangeFromWorkingSet(drop_range, true, data_parts_lock);
|
|
String parts_to_remove_str;
|
|
for (const auto & part : parts_to_remove)
|
|
{
|
|
parts_to_remove_str += part->name;
|
|
parts_to_remove_str += " ";
|
|
}
|
|
LOG_TRACE(log, "Replacing {} parts {}with {} parts {}", parts_to_remove.size(), parts_to_remove_str,
|
|
final_parts.size(), boost::algorithm::join(final_part_names, ", "));
|
|
}
|
|
}
|
|
|
|
PartLog::addNewParts(getContext(), res_parts, watch.elapsed());
|
|
}
|
|
catch (...)
|
|
{
|
|
PartLog::addNewParts(getContext(), res_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
|
|
throw;
|
|
}
|
|
|
|
removePartsFromZooKeeperWithRetries(parts_to_remove);
|
|
res_parts.clear();
|
|
parts_to_remove.clear();
|
|
cleanup_thread.wakeup();
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::executeClonePartFromShard(const LogEntry & entry)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
Strings replicas = zookeeper->getChildren(entry.source_shard + "/replicas");
|
|
std::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
|
|
String replica;
|
|
for (const String & candidate : replicas)
|
|
{
|
|
if (zookeeper->exists(entry.source_shard + "/replicas/" + candidate + "/is_active"))
|
|
{
|
|
replica = candidate;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (replica.empty())
|
|
throw Exception(ErrorCodes::NO_REPLICA_HAS_PART, "Not found active replica on shard {} to clone part {}", entry.source_shard, entry.new_part_name);
|
|
|
|
LOG_INFO(log, "Will clone part from shard {} and replica {}", entry.source_shard, replica);
|
|
|
|
MutableDataPartPtr part;
|
|
|
|
{
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
String source_replica_path = entry.source_shard + "/replicas/" + replica;
|
|
ReplicatedMergeTreeAddress address(getZooKeeper()->get(source_replica_path + "/host"));
|
|
auto timeouts = ConnectionTimeouts::getHTTPTimeouts(getContext());
|
|
auto credentials = getContext()->getInterserverCredentials();
|
|
String interserver_scheme = getContext()->getInterserverScheme();
|
|
|
|
auto get_part = [&, address, timeouts, credentials, interserver_scheme]()
|
|
{
|
|
if (interserver_scheme != address.scheme)
|
|
throw Exception("Interserver schemes are different: '" + interserver_scheme
|
|
+ "' != '" + address.scheme + "', can't fetch part from " + address.host,
|
|
ErrorCodes::LOGICAL_ERROR);
|
|
|
|
return fetcher.fetchPart(
|
|
metadata_snapshot, getContext(), entry.new_part_name, source_replica_path,
|
|
address.host, address.replication_port,
|
|
timeouts, credentials->getUser(), credentials->getPassword(), interserver_scheme,
|
|
replicated_fetches_throttler, true);
|
|
};
|
|
|
|
part = get_part();
|
|
// The fetched part is valuable and should not be cleaned like a temp part.
|
|
part->is_temp = false;
|
|
part->renameTo("detached/" + entry.new_part_name, true);
|
|
LOG_INFO(log, "Cloned part {} to detached directory", part->name);
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::cloneReplica(const String & source_replica, Coordination::Stat source_is_lost_stat, zkutil::ZooKeeperPtr & zookeeper)
|
|
{
|
|
String source_path = fs::path(zookeeper_path) / "replicas" / source_replica;
|
|
|
|
/// The order of the following three actions is important.
|
|
|
|
Strings source_queue_names;
|
|
/// We are trying to get consistent /log_pointer and /queue state. Otherwise
|
|
/// we can possibly duplicate entries in queue of cloned replica.
|
|
while (true)
|
|
{
|
|
Coordination::Stat log_pointer_stat;
|
|
String raw_log_pointer = zookeeper->get(fs::path(source_path) / "log_pointer", &log_pointer_stat);
|
|
|
|
Coordination::Requests ops;
|
|
ops.push_back(zkutil::makeSetRequest(fs::path(replica_path) / "log_pointer", raw_log_pointer, -1));
|
|
|
|
/// For support old versions CH.
|
|
if (source_is_lost_stat.version == -1)
|
|
{
|
|
/// We check that it was not suddenly upgraded to new version.
|
|
/// Otherwise it can be upgraded and instantly become lost, but we cannot notice that.
|
|
ops.push_back(zkutil::makeCreateRequest(fs::path(source_path) / "is_lost", "0", zkutil::CreateMode::Persistent));
|
|
ops.push_back(zkutil::makeRemoveRequest(fs::path(source_path) / "is_lost", -1));
|
|
}
|
|
else /// The replica we clone should not suddenly become lost.
|
|
ops.push_back(zkutil::makeCheckRequest(fs::path(source_path) / "is_lost", source_is_lost_stat.version));
|
|
|
|
Coordination::Responses responses;
|
|
|
|
/// Let's remember the queue of the reference/master replica.
|
|
source_queue_names = zookeeper->getChildren(fs::path(source_path) / "queue");
|
|
|
|
/// Check that log pointer of source replica didn't changed while we read queue entries
|
|
ops.push_back(zkutil::makeCheckRequest(fs::path(source_path) / "log_pointer", log_pointer_stat.version));
|
|
|
|
auto rc = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (rc == Coordination::Error::ZOK)
|
|
{
|
|
break;
|
|
}
|
|
else if (rc == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
throw Exception(
|
|
"Can not clone replica, because the " + source_replica + " updated to new ClickHouse version",
|
|
ErrorCodes::REPLICA_STATUS_CHANGED);
|
|
}
|
|
else if (responses[1]->error == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// If is_lost node version changed than source replica also lost,
|
|
/// so we cannot clone from it.
|
|
throw Exception(
|
|
"Can not clone replica, because the " + source_replica + " became lost", ErrorCodes::REPLICA_STATUS_CHANGED);
|
|
}
|
|
else if (responses.back()->error == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// If source replica's log_pointer changed than we probably read
|
|
/// stale state of /queue and have to try one more time.
|
|
LOG_WARNING(log, "Log pointer of source replica {} changed while we loading queue nodes. Will retry.", source_replica);
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
zkutil::KeeperMultiException::check(rc, ops, responses);
|
|
}
|
|
}
|
|
|
|
::sort(source_queue_names.begin(), source_queue_names.end());
|
|
|
|
struct QueueEntryInfo
|
|
{
|
|
String data = {};
|
|
Coordination::Stat stat = {};
|
|
LogEntryPtr parsed_entry = {};
|
|
};
|
|
|
|
/// We got log pointer and list of queue entries of source replica.
|
|
/// At first we will get queue entries and then we will get list of active parts of source replica
|
|
/// to enqueue fetches for missing parts. If source replica executes and removes some entry concurrently
|
|
/// we will see produced part (or covering part) in replicas/source/parts and will enqueue fetch.
|
|
/// We will try to parse queue entries before copying them
|
|
/// to avoid creation of excessive and duplicating entries in our queue.
|
|
/// See also removePartAndEnqueueFetch(...)
|
|
std::vector<QueueEntryInfo> source_queue;
|
|
ActiveDataPartSet get_part_set{format_version};
|
|
ActiveDataPartSet drop_range_set{format_version};
|
|
|
|
{
|
|
std::vector<zkutil::ZooKeeper::FutureGet> queue_get_futures;
|
|
queue_get_futures.reserve(source_queue_names.size());
|
|
|
|
for (const String & entry_name : source_queue_names)
|
|
queue_get_futures.push_back(zookeeper->asyncTryGet(fs::path(source_path) / "queue" / entry_name));
|
|
|
|
source_queue.reserve(source_queue_names.size());
|
|
for (size_t i = 0; i < source_queue_names.size(); ++i)
|
|
{
|
|
auto res = queue_get_futures[i].get();
|
|
/// It's ok if entry is already executed and removed: we also will get source parts set.
|
|
if (res.error == Coordination::Error::ZNONODE)
|
|
continue;
|
|
|
|
assert(res.error == Coordination::Error::ZOK);
|
|
source_queue.emplace_back();
|
|
auto & info = source_queue.back();
|
|
info.data = std::move(res.data);
|
|
info.stat = std::move(res.stat);
|
|
try
|
|
{
|
|
info.parsed_entry = LogEntry::parse(info.data, info.stat);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "Cannot parse source queue entry " + source_queue_names[i]);
|
|
}
|
|
|
|
/// It may be ok if source replica has newer version. We will copy entry as is.
|
|
if (!info.parsed_entry)
|
|
continue;
|
|
|
|
info.parsed_entry->znode_name = source_queue_names[i];
|
|
|
|
if (info.parsed_entry->type == LogEntry::DROP_RANGE)
|
|
drop_range_set.add(info.parsed_entry->new_part_name);
|
|
|
|
if (info.parsed_entry->type == LogEntry::GET_PART)
|
|
{
|
|
String maybe_covering_drop_range = drop_range_set.getContainingPart(info.parsed_entry->new_part_name);
|
|
if (maybe_covering_drop_range.empty())
|
|
get_part_set.add(info.parsed_entry->new_part_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// We should do it after copying queue, because some ALTER_METADATA entries can be lost otherwise.
|
|
cloneMetadataIfNeeded(source_replica, source_path, zookeeper);
|
|
|
|
/// Add to the queue jobs to receive all the active parts that the reference/master replica has.
|
|
Strings source_replica_parts = zookeeper->getChildren(fs::path(source_path) / "parts");
|
|
for (const auto & active_part : source_replica_parts)
|
|
get_part_set.add(active_part);
|
|
|
|
Strings active_parts = get_part_set.getParts();
|
|
|
|
/// Remove local parts if source replica does not have them, because such parts will never be fetched by other replicas.
|
|
Strings local_parts_in_zk = zookeeper->getChildren(fs::path(replica_path) / "parts");
|
|
Strings parts_to_remove_from_zk;
|
|
|
|
for (const auto & part : local_parts_in_zk)
|
|
{
|
|
if (get_part_set.getContainingPart(part).empty())
|
|
{
|
|
parts_to_remove_from_zk.emplace_back(part);
|
|
LOG_WARNING(log, "Source replica does not have part {}. Removing it from ZooKeeper.", part);
|
|
}
|
|
}
|
|
|
|
{
|
|
/// Check "is_lost" version after retrieving queue and parts.
|
|
/// If version has changed, then replica most likely has been dropped and parts set is inconsistent,
|
|
/// so throw exception and retry cloning.
|
|
Coordination::Stat is_lost_stat_new;
|
|
zookeeper->get(fs::path(source_path) / "is_lost", &is_lost_stat_new);
|
|
if (is_lost_stat_new.version != source_is_lost_stat.version)
|
|
throw Exception(ErrorCodes::REPLICA_STATUS_CHANGED, "Cannot clone {}, because it suddenly become lost "
|
|
"or removed broken part from ZooKeeper", source_replica);
|
|
}
|
|
|
|
removePartsFromZooKeeperWithRetries(parts_to_remove_from_zk);
|
|
|
|
auto local_active_parts = getDataParts();
|
|
|
|
DataPartsVector parts_to_remove_from_working_set;
|
|
|
|
for (const auto & part : local_active_parts)
|
|
{
|
|
if (get_part_set.getContainingPart(part->name).empty())
|
|
{
|
|
parts_to_remove_from_working_set.emplace_back(part);
|
|
LOG_WARNING(log, "Source replica does not have part {}. Removing it from working set.", part->name);
|
|
}
|
|
}
|
|
|
|
if (getSettings()->detach_old_local_parts_when_cloning_replica)
|
|
{
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
for (const auto & part : parts_to_remove_from_working_set)
|
|
{
|
|
LOG_INFO(log, "Detaching {}", part->relative_path);
|
|
part->makeCloneInDetached("clone", metadata_snapshot);
|
|
}
|
|
}
|
|
|
|
removePartsFromWorkingSet(parts_to_remove_from_working_set, true);
|
|
|
|
std::unordered_set<String> created_get_parts;
|
|
|
|
/// Avoid creation of GET_PART entries which covered by another GET_PART or DROP_RANGE
|
|
/// and creation of multiple entries with the same new_part_name.
|
|
auto should_ignore_log_entry = [&drop_range_set, &get_part_set, this] (std::unordered_set<String> & created_gets,
|
|
const String & part_name, const String & log_msg_context) -> bool
|
|
{
|
|
/// We should not create entries covered by DROP_RANGE, because we will remove them anyway (kind of optimization).
|
|
String covering_drop_range = drop_range_set.getContainingPart(part_name);
|
|
if (!covering_drop_range.empty())
|
|
{
|
|
LOG_TRACE(log, "{} {}: it's covered by DROP_RANGE {}", log_msg_context, part_name, covering_drop_range);
|
|
return true;
|
|
}
|
|
|
|
/// We should not create entries covered by GET_PART,
|
|
/// because GET_PART entry has no source parts and we can execute it only by fetching.
|
|
/// Parts covered by GET_PART are useless and may cause replication to stuck if covered part is lost.
|
|
String covering_get_part_entry = get_part_set.getContainingPart(part_name);
|
|
|
|
if (covering_get_part_entry.empty())
|
|
return false;
|
|
|
|
if (covering_get_part_entry != part_name)
|
|
{
|
|
LOG_TRACE(log, "{} {}: it's covered by GET_PART {}", log_msg_context, part_name, covering_get_part_entry);
|
|
return true;
|
|
}
|
|
|
|
/// NOTE: It does not completely avoids duplication of GET_PART entries,
|
|
/// because it's possible that source replica has executed some GET_PART after we copied it's queue,
|
|
/// but before we copied its active parts set. In this case we will GET_PART entry in our queue
|
|
/// and later will pull the original GET_PART from replication log.
|
|
/// It should not cause any issues, but it does not allow to get rid of duplicated entries and add an assertion.
|
|
if (created_gets.count(part_name))
|
|
{
|
|
/// NOTE It would be better to copy log entry instead of creating GET_PART
|
|
/// if there are GET_PART and log entry of other type with the same new_part_name.
|
|
/// But it's a bit harder to implement, because it requires full-fledged virtual_parts set.
|
|
LOG_TRACE(log, "{} {}: GET_PART for it is already created", log_msg_context, part_name);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
};
|
|
|
|
for (const String & name : active_parts)
|
|
{
|
|
if (should_ignore_log_entry(created_get_parts, name, "Not fetching"))
|
|
continue;
|
|
|
|
LogEntry log_entry;
|
|
|
|
if (are_restoring_replica)
|
|
{
|
|
LOG_DEBUG(log, "Obtaining checksum for path {}", name);
|
|
|
|
// The part we want to fetch is probably present in detached/ folder.
|
|
// However, we need to get part's checksum to check if it's not corrupt.
|
|
log_entry.type = LogEntry::ATTACH_PART;
|
|
|
|
MinimalisticDataPartChecksums desired_checksums;
|
|
|
|
const fs::path part_path = fs::path(source_path) / "parts" / name;
|
|
|
|
const String part_znode = zookeeper->get(part_path);
|
|
|
|
if (!part_znode.empty())
|
|
desired_checksums = ReplicatedMergeTreePartHeader::fromString(part_znode).getChecksums();
|
|
else
|
|
{
|
|
String desired_checksums_str = zookeeper->get(part_path / "checksums");
|
|
desired_checksums = MinimalisticDataPartChecksums::deserializeFrom(desired_checksums_str);
|
|
}
|
|
|
|
const auto [lo, hi] = desired_checksums.hash_of_all_files;
|
|
log_entry.part_checksum = getHexUIntUppercase(hi) + getHexUIntUppercase(lo);
|
|
}
|
|
else
|
|
{
|
|
log_entry.type = LogEntry::GET_PART;
|
|
}
|
|
|
|
log_entry.source_replica = "";
|
|
log_entry.new_part_name = name;
|
|
log_entry.create_time = tryGetPartCreateTime(zookeeper, source_path, name);
|
|
|
|
LOG_TEST(log, "Enqueueing {} for fetch", name);
|
|
zookeeper->create(fs::path(replica_path) / "queue/queue-", log_entry.toString(), zkutil::CreateMode::PersistentSequential);
|
|
created_get_parts.insert(name);
|
|
}
|
|
|
|
size_t total_parts_to_fetch = created_get_parts.size();
|
|
LOG_DEBUG(log, "Queued {} parts to be fetched, {} parts ignored", total_parts_to_fetch, active_parts.size() - total_parts_to_fetch);
|
|
|
|
/// Add content of the reference/master replica queue to the queue.
|
|
size_t total_entries_to_copy = 0;
|
|
for (const auto & entry_info : source_queue)
|
|
{
|
|
assert(!entry_info.data.empty());
|
|
if (entry_info.parsed_entry && !entry_info.parsed_entry->new_part_name.empty())
|
|
{
|
|
const String & part_name = entry_info.parsed_entry->new_part_name;
|
|
const String & entry_name = entry_info.parsed_entry->znode_name;
|
|
const auto & entry_type = entry_info.parsed_entry->type;
|
|
|
|
if (should_ignore_log_entry(created_get_parts, part_name, fmt::format("Not copying {} {} ", entry_name, entry_type)))
|
|
continue;
|
|
|
|
if (entry_info.parsed_entry->type == LogEntry::GET_PART)
|
|
created_get_parts.insert(part_name);
|
|
}
|
|
|
|
LOG_TEST(log, "Copying entry {}", entry_info.data);
|
|
zookeeper->create(fs::path(replica_path) / "queue/queue-", entry_info.data, zkutil::CreateMode::PersistentSequential);
|
|
++total_entries_to_copy;
|
|
}
|
|
|
|
LOG_DEBUG(log, "Copied {} queue entries, {} entries ignored", total_entries_to_copy, source_queue.size() - total_entries_to_copy);
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::cloneMetadataIfNeeded(const String & source_replica, const String & source_path, zkutil::ZooKeeperPtr & zookeeper)
|
|
{
|
|
String source_metadata_version_str;
|
|
bool metadata_version_exists = zookeeper->tryGet(source_path + "/metadata_version", source_metadata_version_str);
|
|
if (!metadata_version_exists)
|
|
{
|
|
/// For compatibility with version older than 20.3
|
|
/// TODO fix tests and delete it
|
|
LOG_WARNING(log, "Node {} does not exist. "
|
|
"Most likely it's because too old version of ClickHouse is running on replica {}. "
|
|
"Will not check metadata consistency",
|
|
source_path + "/metadata_version", source_replica);
|
|
return;
|
|
}
|
|
|
|
Int32 source_metadata_version = parse<Int32>(source_metadata_version_str);
|
|
if (metadata_version == source_metadata_version)
|
|
return;
|
|
|
|
/// Our metadata it not up to date with source replica metadata.
|
|
/// Metadata is updated by ALTER_METADATA entries, but some entries are probably cleaned up from the log.
|
|
/// It's also possible that some newer ALTER_METADATA entries are present in source_queue list,
|
|
/// and source replica are executing such entry right now (or had executed recently).
|
|
/// More than that, /metadata_version update is not atomic with /columns and /metadata update...
|
|
|
|
/// Fortunately, ALTER_METADATA seems to be idempotent,
|
|
/// and older entries of such type can be replaced with newer entries.
|
|
/// Let's try to get consistent values of source replica's /columns and /metadata
|
|
/// and prepend dummy ALTER_METADATA to our replication queue.
|
|
/// It should not break anything if source_queue already contains ALTER_METADATA entry
|
|
/// with greater or equal metadata_version, but it will update our metadata
|
|
/// if all such entries were cleaned up from the log and source_queue.
|
|
|
|
LOG_WARNING(log, "Metadata version ({}) on replica is not up to date with metadata ({}) on source replica {}",
|
|
metadata_version, source_metadata_version, source_replica);
|
|
|
|
String source_metadata;
|
|
String source_columns;
|
|
while (true)
|
|
{
|
|
Coordination::Stat metadata_stat;
|
|
Coordination::Stat columns_stat;
|
|
source_metadata = zookeeper->get(source_path + "/metadata", &metadata_stat);
|
|
source_columns = zookeeper->get(source_path + "/columns", &columns_stat);
|
|
|
|
Coordination::Requests ops;
|
|
Coordination::Responses responses;
|
|
ops.emplace_back(zkutil::makeCheckRequest(source_path + "/metadata", metadata_stat.version));
|
|
ops.emplace_back(zkutil::makeCheckRequest(source_path + "/columns", columns_stat.version));
|
|
|
|
Coordination::Error code = zookeeper->tryMulti(ops, responses);
|
|
if (code == Coordination::Error::ZOK)
|
|
break;
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
LOG_WARNING(log, "Metadata of replica {} was changed", source_path);
|
|
else
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
|
|
ReplicatedMergeTreeLogEntryData dummy_alter;
|
|
dummy_alter.type = LogEntry::ALTER_METADATA;
|
|
dummy_alter.source_replica = source_replica;
|
|
dummy_alter.metadata_str = source_metadata;
|
|
dummy_alter.columns_str = source_columns;
|
|
dummy_alter.alter_version = source_metadata_version;
|
|
dummy_alter.create_time = time(nullptr);
|
|
|
|
zookeeper->create(replica_path + "/queue/queue-", dummy_alter.toString(), zkutil::CreateMode::PersistentSequential);
|
|
|
|
/// We don't need to do anything with mutation_pointer, because mutation log cleanup process is different from
|
|
/// replication log cleanup. A mutation is removed from ZooKeeper only if all replicas had executed the mutation,
|
|
/// so all mutations which are greater or equal to our mutation pointer are still present in ZooKeeper.
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::cloneReplicaIfNeeded(zkutil::ZooKeeperPtr zookeeper)
|
|
{
|
|
Coordination::Stat is_lost_stat;
|
|
bool is_new_replica = true;
|
|
String res;
|
|
|
|
if (zookeeper->tryGet(fs::path(replica_path) / "is_lost", res, &is_lost_stat))
|
|
{
|
|
if (res == "0")
|
|
return;
|
|
if (is_lost_stat.version)
|
|
is_new_replica = false;
|
|
}
|
|
else
|
|
{
|
|
/// Replica was created by old version of CH, so me must create "/is_lost".
|
|
/// Note that in old version of CH there was no "lost" replicas possible.
|
|
/// TODO is_lost node should always exist since v18.12, maybe we can replace `tryGet` with `get` and remove old code?
|
|
zookeeper->create(fs::path(replica_path) / "is_lost", "0", zkutil::CreateMode::Persistent);
|
|
return;
|
|
}
|
|
|
|
/// is_lost is "1": it means that we are in repair mode.
|
|
/// Try choose source replica to clone.
|
|
/// Source replica must not be lost and should have minimal queue size and maximal log pointer.
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
std::vector<zkutil::ZooKeeper::FutureGet> futures;
|
|
for (const String & source_replica_name : replicas)
|
|
{
|
|
/// Do not clone from myself.
|
|
if (source_replica_name == replica_name)
|
|
continue;
|
|
|
|
String source_replica_path = fs::path(zookeeper_path) / "replicas" / source_replica_name;
|
|
|
|
/// Obviously the following get operations are not atomic, but it's ok to choose good enough replica, not the best one.
|
|
/// NOTE: We may count some entries twice if log_pointer is moved.
|
|
futures.emplace_back(zookeeper->asyncTryGet(fs::path(source_replica_path) / "is_lost"));
|
|
futures.emplace_back(zookeeper->asyncTryGet(fs::path(source_replica_path) / "log_pointer"));
|
|
futures.emplace_back(zookeeper->asyncTryGet(fs::path(source_replica_path) / "queue"));
|
|
}
|
|
|
|
/// Wait for results before getting log entries
|
|
for (auto & future : futures)
|
|
future.wait();
|
|
|
|
Strings log_entries = zookeeper->getChildren(fs::path(zookeeper_path) / "log");
|
|
size_t max_log_entry = 0;
|
|
if (!log_entries.empty())
|
|
{
|
|
String last_entry = *std::max_element(log_entries.begin(), log_entries.end());
|
|
max_log_entry = parse<UInt64>(last_entry.substr(strlen("log-")));
|
|
}
|
|
/// log_pointer can point to future entry, which was not created yet
|
|
++max_log_entry;
|
|
|
|
size_t min_replication_lag = std::numeric_limits<size_t>::max();
|
|
String source_replica;
|
|
Coordination::Stat source_is_lost_stat;
|
|
size_t future_num = 0;
|
|
|
|
for (const String & source_replica_name : replicas)
|
|
{
|
|
if (source_replica_name == replica_name)
|
|
continue;
|
|
|
|
auto get_is_lost = futures[future_num++].get();
|
|
auto get_log_pointer = futures[future_num++].get();
|
|
auto get_queue = futures[future_num++].get();
|
|
|
|
if (get_is_lost.error != Coordination::Error::ZOK)
|
|
{
|
|
LOG_INFO(log, "Not cloning {}, cannot get '/is_lost': {}", source_replica_name, Coordination::errorMessage(get_is_lost.error));
|
|
continue;
|
|
}
|
|
else if (get_is_lost.data != "0")
|
|
{
|
|
LOG_INFO(log, "Not cloning {}, it's lost", source_replica_name);
|
|
continue;
|
|
}
|
|
|
|
if (get_log_pointer.error != Coordination::Error::ZOK)
|
|
{
|
|
LOG_INFO(log, "Not cloning {}, cannot get '/log_pointer': {}", source_replica_name, Coordination::errorMessage(get_log_pointer.error));
|
|
continue;
|
|
}
|
|
if (get_queue.error != Coordination::Error::ZOK)
|
|
{
|
|
LOG_INFO(log, "Not cloning {}, cannot get '/queue': {}", source_replica_name, Coordination::errorMessage(get_queue.error));
|
|
continue;
|
|
}
|
|
|
|
/// Replica is not lost and we can clone it. Let's calculate approx replication lag.
|
|
size_t source_log_pointer = get_log_pointer.data.empty() ? 0 : parse<UInt64>(get_log_pointer.data);
|
|
assert(source_log_pointer <= max_log_entry);
|
|
size_t replica_queue_lag = max_log_entry - source_log_pointer;
|
|
size_t replica_queue_size = get_queue.stat.numChildren;
|
|
size_t replication_lag = replica_queue_lag + replica_queue_size;
|
|
LOG_INFO(log, "Replica {} has log pointer '{}', approximate {} queue lag and {} queue size",
|
|
source_replica_name, get_log_pointer.data, replica_queue_lag, replica_queue_size);
|
|
if (replication_lag < min_replication_lag)
|
|
{
|
|
source_replica = source_replica_name;
|
|
source_is_lost_stat = get_is_lost.stat;
|
|
min_replication_lag = replication_lag;
|
|
}
|
|
}
|
|
|
|
if (source_replica.empty())
|
|
throw Exception("All replicas are lost", ErrorCodes::ALL_REPLICAS_LOST);
|
|
|
|
if (is_new_replica)
|
|
LOG_INFO(log, "Will mimic {}", source_replica);
|
|
else
|
|
LOG_WARNING(log, "Will mimic {}", source_replica);
|
|
|
|
/// Clear obsolete queue that we no longer need.
|
|
zookeeper->removeChildren(fs::path(replica_path) / "queue");
|
|
queue.clear();
|
|
|
|
/// Will do repair from the selected replica.
|
|
cloneReplica(source_replica, source_is_lost_stat, zookeeper);
|
|
/// If repair fails to whatever reason, the exception is thrown, is_lost will remain "1" and the replica will be repaired later.
|
|
|
|
/// If replica is repaired successfully, we remove is_lost flag.
|
|
zookeeper->set(fs::path(replica_path) / "is_lost", "0");
|
|
}
|
|
|
|
String StorageReplicatedMergeTree::getLastQueueUpdateException() const
|
|
{
|
|
std::unique_lock lock(last_queue_update_exception_lock);
|
|
return last_queue_update_exception;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::queueUpdatingTask()
|
|
{
|
|
if (!queue_update_in_progress)
|
|
{
|
|
last_queue_update_start_time.store(time(nullptr));
|
|
queue_update_in_progress = true;
|
|
}
|
|
try
|
|
{
|
|
queue.pullLogsToQueue(getZooKeeperAndAssertNotReadonly(), queue_updating_task->getWatchCallback(), ReplicatedMergeTreeQueue::UPDATE);
|
|
last_queue_update_finish_time.store(time(nullptr));
|
|
queue_update_in_progress = false;
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
|
|
std::unique_lock lock(last_queue_update_exception_lock);
|
|
last_queue_update_exception = getCurrentExceptionMessage(false);
|
|
|
|
if (e.code == Coordination::Error::ZSESSIONEXPIRED)
|
|
{
|
|
restarting_thread.wakeup();
|
|
return;
|
|
}
|
|
|
|
queue_updating_task->scheduleAfter(QUEUE_UPDATE_ERROR_SLEEP_MS);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
|
|
std::unique_lock lock(last_queue_update_exception_lock);
|
|
last_queue_update_exception = getCurrentExceptionMessage(false);
|
|
|
|
queue_updating_task->scheduleAfter(QUEUE_UPDATE_ERROR_SLEEP_MS);
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::mutationsUpdatingTask()
|
|
{
|
|
try
|
|
{
|
|
queue.updateMutations(getZooKeeper(), mutations_updating_task->getWatchCallback());
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
|
|
if (e.code == Coordination::Error::ZSESSIONEXPIRED)
|
|
return;
|
|
|
|
mutations_updating_task->scheduleAfter(QUEUE_UPDATE_ERROR_SLEEP_MS);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
mutations_updating_task->scheduleAfter(QUEUE_UPDATE_ERROR_SLEEP_MS);
|
|
}
|
|
}
|
|
|
|
ReplicatedMergeTreeQueue::SelectedEntryPtr StorageReplicatedMergeTree::selectQueueEntry()
|
|
{
|
|
/// This object will mark the element of the queue as running.
|
|
ReplicatedMergeTreeQueue::SelectedEntryPtr selected;
|
|
|
|
try
|
|
{
|
|
selected = queue.selectEntryToProcess(merger_mutator, *this);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
}
|
|
|
|
return selected;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::processQueueEntry(ReplicatedMergeTreeQueue::SelectedEntryPtr selected_entry)
|
|
{
|
|
LogEntryPtr & entry = selected_entry->log_entry;
|
|
return queue.processEntry([this]{ return getZooKeeper(); }, entry, [&](LogEntryPtr & entry_to_process)
|
|
{
|
|
try
|
|
{
|
|
return executeLogEntry(*entry_to_process);
|
|
}
|
|
catch (const Exception & e)
|
|
{
|
|
if (e.code() == ErrorCodes::NO_REPLICA_HAS_PART)
|
|
{
|
|
/// If no one has the right part, probably not all replicas work; We will not write to log with Error level.
|
|
LOG_INFO(log, fmt::runtime(e.displayText()));
|
|
}
|
|
else if (e.code() == ErrorCodes::ABORTED)
|
|
{
|
|
/// Interrupted merge or downloading a part is not an error.
|
|
LOG_INFO(log, fmt::runtime(e.message()));
|
|
}
|
|
else if (e.code() == ErrorCodes::PART_IS_TEMPORARILY_LOCKED)
|
|
{
|
|
/// Part cannot be added temporarily
|
|
LOG_INFO(log, fmt::runtime(e.displayText()));
|
|
cleanup_thread.wakeup();
|
|
}
|
|
else
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
|
|
/** This exception will be written to the queue element, and it can be looked up using `system.replication_queue` table.
|
|
* The thread that performs this action will sleep a few seconds after the exception.
|
|
* See `queue.processEntry` function.
|
|
*/
|
|
throw;
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
throw;
|
|
}
|
|
});
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::scheduleDataProcessingJob(BackgroundJobsAssignee & assignee)
|
|
{
|
|
/// If replication queue is stopped exit immediately as we successfully executed the task
|
|
if (queue.actions_blocker.isCancelled())
|
|
return false;
|
|
|
|
/// This object will mark the element of the queue as running.
|
|
ReplicatedMergeTreeQueue::SelectedEntryPtr selected_entry = selectQueueEntry();
|
|
|
|
if (!selected_entry)
|
|
return false;
|
|
|
|
auto job_type = selected_entry->log_entry->type;
|
|
|
|
/// Depending on entry type execute in fetches (small) pool or big merge_mutate pool
|
|
if (job_type == LogEntry::GET_PART)
|
|
{
|
|
assignee.scheduleFetchTask(ExecutableLambdaAdapter::create(
|
|
[this, selected_entry] () mutable
|
|
{
|
|
return processQueueEntry(selected_entry);
|
|
}, common_assignee_trigger, getStorageID()));
|
|
return true;
|
|
}
|
|
else if (job_type == LogEntry::MERGE_PARTS)
|
|
{
|
|
auto task = MergeFromLogEntryTask::create(selected_entry, *this, common_assignee_trigger);
|
|
assignee.scheduleMergeMutateTask(task);
|
|
return true;
|
|
}
|
|
else if (job_type == LogEntry::MUTATE_PART)
|
|
{
|
|
auto task = MutateFromLogEntryTask::create(selected_entry, *this, common_assignee_trigger);
|
|
assignee.scheduleMergeMutateTask(task);
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
assignee.scheduleCommonTask(ExecutableLambdaAdapter::create(
|
|
[this, selected_entry] () mutable
|
|
{
|
|
return processQueueEntry(selected_entry);
|
|
}, common_assignee_trigger, getStorageID()), /* need_trigger */ true);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::canExecuteFetch(const ReplicatedMergeTreeLogEntry & entry, String & disable_reason) const
|
|
{
|
|
if (fetcher.blocker.isCancelled())
|
|
{
|
|
disable_reason = fmt::format("Not executing fetch of part {} because replicated fetches are cancelled now.", entry.new_part_name);
|
|
return false;
|
|
}
|
|
|
|
size_t busy_threads_in_pool = CurrentMetrics::values[CurrentMetrics::BackgroundFetchesPoolTask].load(std::memory_order_relaxed);
|
|
if (busy_threads_in_pool >= replicated_fetches_pool_size)
|
|
{
|
|
disable_reason = fmt::format("Not executing fetch of part {} because {} fetches already executing, max {}.", entry.new_part_name, busy_threads_in_pool, replicated_fetches_pool_size);
|
|
return false;
|
|
}
|
|
|
|
if (replicated_fetches_throttler->isThrottling())
|
|
{
|
|
disable_reason = fmt::format("Not executing fetch of part {} because fetches have already throttled by network settings "
|
|
"<max_replicated_fetches_network_bandwidth> or <max_replicated_fetches_network_bandwidth_for_server>.", entry.new_part_name);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::partIsAssignedToBackgroundOperation(const DataPartPtr & part) const
|
|
{
|
|
return queue.isVirtualPart(part);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::mergeSelectingTask()
|
|
{
|
|
if (!is_leader)
|
|
return;
|
|
|
|
const auto storage_settings_ptr = getSettings();
|
|
const bool deduplicate = false; /// TODO: read deduplicate option from table config
|
|
const Names deduplicate_by_columns = {};
|
|
CreateMergeEntryResult create_result = CreateMergeEntryResult::Other;
|
|
|
|
try
|
|
{
|
|
/// We must select parts for merge under merge_selecting_mutex because other threads
|
|
/// (OPTIMIZE queries) can assign new merges.
|
|
std::lock_guard merge_selecting_lock(merge_selecting_mutex);
|
|
|
|
auto zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
|
|
ReplicatedMergeTreeMergePredicate merge_pred = queue.getMergePredicate(zookeeper);
|
|
|
|
/// If many merges is already queued, then will queue only small enough merges.
|
|
/// Otherwise merge queue could be filled with only large merges,
|
|
/// and in the same time, many small parts could be created and won't be merged.
|
|
|
|
auto merges_and_mutations_queued = queue.countMergesAndPartMutations();
|
|
size_t merges_and_mutations_sum = merges_and_mutations_queued.merges + merges_and_mutations_queued.mutations;
|
|
if (merges_and_mutations_sum >= storage_settings_ptr->max_replicated_merges_in_queue)
|
|
{
|
|
LOG_TRACE(log, "Number of queued merges ({}) and part mutations ({})"
|
|
" is greater than max_replicated_merges_in_queue ({}), so won't select new parts to merge or mutate.",
|
|
merges_and_mutations_queued.merges,
|
|
merges_and_mutations_queued.mutations,
|
|
storage_settings_ptr->max_replicated_merges_in_queue);
|
|
}
|
|
else
|
|
{
|
|
UInt64 max_source_parts_size_for_merge = merger_mutator.getMaxSourcePartsSizeForMerge(
|
|
storage_settings_ptr->max_replicated_merges_in_queue, merges_and_mutations_sum);
|
|
|
|
UInt64 max_source_part_size_for_mutation = merger_mutator.getMaxSourcePartSizeForMutation();
|
|
|
|
bool merge_with_ttl_allowed = merges_and_mutations_queued.merges_with_ttl < storage_settings_ptr->max_replicated_merges_with_ttl_in_queue &&
|
|
getTotalMergesWithTTLInMergeList() < storage_settings_ptr->max_number_of_merges_with_ttl_in_pool;
|
|
|
|
auto future_merged_part = std::make_shared<FutureMergedMutatedPart>();
|
|
if (storage_settings.get()->assign_part_uuids)
|
|
future_merged_part->uuid = UUIDHelpers::generateV4();
|
|
|
|
if (max_source_parts_size_for_merge > 0 &&
|
|
merger_mutator.selectPartsToMerge(future_merged_part, false, max_source_parts_size_for_merge, merge_pred, merge_with_ttl_allowed, nullptr) == SelectPartsDecision::SELECTED)
|
|
{
|
|
create_result = createLogEntryToMergeParts(
|
|
zookeeper,
|
|
future_merged_part->parts,
|
|
future_merged_part->name,
|
|
future_merged_part->uuid,
|
|
future_merged_part->type,
|
|
deduplicate,
|
|
deduplicate_by_columns,
|
|
nullptr,
|
|
merge_pred.getVersion(),
|
|
future_merged_part->merge_type);
|
|
}
|
|
/// If there are many mutations in queue, it may happen, that we cannot enqueue enough merges to merge all new parts
|
|
else if (max_source_part_size_for_mutation > 0 && queue.countMutations() > 0
|
|
&& merges_and_mutations_queued.mutations < storage_settings_ptr->max_replicated_mutations_in_queue)
|
|
{
|
|
/// Choose a part to mutate.
|
|
DataPartsVector data_parts = getDataPartsVector();
|
|
for (const auto & part : data_parts)
|
|
{
|
|
if (part->getBytesOnDisk() > max_source_part_size_for_mutation)
|
|
continue;
|
|
|
|
std::optional<std::pair<Int64, int>> desired_mutation_version = merge_pred.getDesiredMutationVersion(part);
|
|
if (!desired_mutation_version)
|
|
continue;
|
|
|
|
create_result = createLogEntryToMutatePart(
|
|
*part,
|
|
future_merged_part->uuid,
|
|
desired_mutation_version->first,
|
|
desired_mutation_version->second,
|
|
merge_pred.getVersion());
|
|
|
|
if (create_result == CreateMergeEntryResult::Ok ||
|
|
create_result == CreateMergeEntryResult::LogUpdated)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
}
|
|
|
|
if (!is_leader)
|
|
return;
|
|
|
|
if (create_result != CreateMergeEntryResult::Ok
|
|
&& create_result != CreateMergeEntryResult::LogUpdated)
|
|
{
|
|
merge_selecting_task->scheduleAfter(storage_settings_ptr->merge_selecting_sleep_ms);
|
|
}
|
|
else
|
|
{
|
|
merge_selecting_task->schedule();
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::mutationsFinalizingTask()
|
|
{
|
|
bool needs_reschedule = false;
|
|
|
|
try
|
|
{
|
|
needs_reschedule = queue.tryFinalizeMutations(getZooKeeperAndAssertNotReadonly());
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
needs_reschedule = true;
|
|
}
|
|
|
|
if (needs_reschedule)
|
|
{
|
|
mutations_finalizing_task->scheduleAfter(MUTATIONS_FINALIZING_SLEEP_MS);
|
|
}
|
|
else
|
|
{
|
|
/// Even if no mutations seems to be done or appeared we are trying to
|
|
/// finalize them in background because manual control the launch of
|
|
/// this function is error prone. This can lead to mutations that
|
|
/// processed all the parts but have is_done=0 state for a long time. Or
|
|
/// killed mutations, which are also considered as undone.
|
|
mutations_finalizing_task->scheduleAfter(MUTATIONS_FINALIZING_IDLE_SLEEP_MS);
|
|
}
|
|
}
|
|
|
|
|
|
StorageReplicatedMergeTree::CreateMergeEntryResult StorageReplicatedMergeTree::createLogEntryToMergeParts(
|
|
zkutil::ZooKeeperPtr & zookeeper,
|
|
const DataPartsVector & parts,
|
|
const String & merged_name,
|
|
const UUID & merged_part_uuid,
|
|
const MergeTreeDataPartType & merged_part_type,
|
|
bool deduplicate,
|
|
const Names & deduplicate_by_columns,
|
|
ReplicatedMergeTreeLogEntryData * out_log_entry,
|
|
int32_t log_version,
|
|
MergeType merge_type)
|
|
{
|
|
std::vector<std::future<Coordination::ExistsResponse>> exists_futures;
|
|
exists_futures.reserve(parts.size());
|
|
for (const auto & part : parts)
|
|
exists_futures.emplace_back(zookeeper->asyncExists(fs::path(replica_path) / "parts" / part->name));
|
|
|
|
bool all_in_zk = true;
|
|
for (size_t i = 0; i < parts.size(); ++i)
|
|
{
|
|
/// If there is no information about part in ZK, we will not merge it.
|
|
if (exists_futures[i].get().error == Coordination::Error::ZNONODE)
|
|
{
|
|
all_in_zk = false;
|
|
|
|
const auto & part = parts[i];
|
|
if (part->modification_time + MAX_AGE_OF_LOCAL_PART_THAT_WASNT_ADDED_TO_ZOOKEEPER < time(nullptr))
|
|
{
|
|
LOG_WARNING(log, "Part {} (that was selected for merge) with age {} seconds exists locally but not in ZooKeeper. Won't do merge with that part and will check it.", part->name, (time(nullptr) - part->modification_time));
|
|
enqueuePartForCheck(part->name);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!all_in_zk)
|
|
return CreateMergeEntryResult::MissingPart;
|
|
|
|
ReplicatedMergeTreeLogEntryData entry;
|
|
entry.type = LogEntry::MERGE_PARTS;
|
|
entry.source_replica = replica_name;
|
|
entry.new_part_name = merged_name;
|
|
entry.new_part_uuid = merged_part_uuid;
|
|
entry.new_part_type = merged_part_type;
|
|
entry.merge_type = merge_type;
|
|
entry.deduplicate = deduplicate;
|
|
entry.deduplicate_by_columns = deduplicate_by_columns;
|
|
entry.create_time = time(nullptr);
|
|
|
|
for (const auto & part : parts)
|
|
entry.source_parts.push_back(part->name);
|
|
|
|
Coordination::Requests ops;
|
|
Coordination::Responses responses;
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(zookeeper_path) / "log/log-", entry.toString(),
|
|
zkutil::CreateMode::PersistentSequential));
|
|
|
|
ops.emplace_back(zkutil::makeSetRequest(
|
|
fs::path(zookeeper_path) / "log", "", log_version)); /// Check and update version.
|
|
|
|
Coordination::Error code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZOK)
|
|
{
|
|
String path_created = dynamic_cast<const Coordination::CreateResponse &>(*responses.front()).path_created;
|
|
entry.znode_name = path_created.substr(path_created.find_last_of('/') + 1);
|
|
|
|
ProfileEvents::increment(ProfileEvents::CreatedLogEntryForMerge);
|
|
LOG_TRACE(log, "Created log entry {} for merge {}", path_created, merged_name);
|
|
}
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
ProfileEvents::increment(ProfileEvents::NotCreatedLogEntryForMerge);
|
|
LOG_TRACE(log, "Log entry is not created for merge {} because log was updated", merged_name);
|
|
return CreateMergeEntryResult::LogUpdated;
|
|
}
|
|
else
|
|
{
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
|
|
if (out_log_entry)
|
|
*out_log_entry = entry;
|
|
|
|
return CreateMergeEntryResult::Ok;
|
|
}
|
|
|
|
|
|
StorageReplicatedMergeTree::CreateMergeEntryResult StorageReplicatedMergeTree::createLogEntryToMutatePart(
|
|
const IMergeTreeDataPart & part, const UUID & new_part_uuid, Int64 mutation_version, int32_t alter_version, int32_t log_version)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
/// If there is no information about part in ZK, we will not mutate it.
|
|
if (!zookeeper->exists(fs::path(replica_path) / "parts" / part.name))
|
|
{
|
|
if (part.modification_time + MAX_AGE_OF_LOCAL_PART_THAT_WASNT_ADDED_TO_ZOOKEEPER < time(nullptr))
|
|
{
|
|
LOG_WARNING(log, "Part {} (that was selected for mutation) with age {} seconds exists locally but not in ZooKeeper."
|
|
" Won't mutate that part and will check it.", part.name, (time(nullptr) - part.modification_time));
|
|
enqueuePartForCheck(part.name);
|
|
}
|
|
|
|
return CreateMergeEntryResult::MissingPart;
|
|
}
|
|
|
|
MergeTreePartInfo new_part_info = part.info;
|
|
new_part_info.mutation = mutation_version;
|
|
|
|
String new_part_name = part.getNewName(new_part_info);
|
|
|
|
ReplicatedMergeTreeLogEntryData entry;
|
|
entry.type = LogEntry::MUTATE_PART;
|
|
entry.source_replica = replica_name;
|
|
entry.source_parts.push_back(part.name);
|
|
entry.new_part_name = new_part_name;
|
|
entry.new_part_uuid = new_part_uuid;
|
|
entry.create_time = time(nullptr);
|
|
entry.alter_version = alter_version;
|
|
|
|
Coordination::Requests ops;
|
|
Coordination::Responses responses;
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(zookeeper_path) / "log/log-", entry.toString(),
|
|
zkutil::CreateMode::PersistentSequential));
|
|
|
|
ops.emplace_back(zkutil::makeSetRequest(
|
|
fs::path(zookeeper_path) / "log", "", log_version)); /// Check and update version.
|
|
|
|
Coordination::Error code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
ProfileEvents::increment(ProfileEvents::NotCreatedLogEntryForMutation);
|
|
LOG_TRACE(log, "Log entry is not created for mutation {} because log was updated", new_part_name);
|
|
return CreateMergeEntryResult::LogUpdated;
|
|
}
|
|
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
|
|
ProfileEvents::increment(ProfileEvents::CreatedLogEntryForMutation);
|
|
LOG_TRACE(log, "Created log entry for mutation {}", new_part_name);
|
|
return CreateMergeEntryResult::Ok;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::removePartFromZooKeeper(const String & part_name, Coordination::Requests & ops, bool has_children)
|
|
{
|
|
String part_path = fs::path(replica_path) / "parts" / part_name;
|
|
|
|
if (has_children)
|
|
{
|
|
ops.emplace_back(zkutil::makeRemoveRequest(fs::path(part_path) / "checksums", -1));
|
|
ops.emplace_back(zkutil::makeRemoveRequest(fs::path(part_path) / "columns", -1));
|
|
}
|
|
ops.emplace_back(zkutil::makeRemoveRequest(part_path, -1));
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::removePartFromZooKeeper(const String & part_name)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
String part_path = fs::path(replica_path) / "parts" / part_name;
|
|
Coordination::Stat stat;
|
|
|
|
/// Part doesn't exist, nothing to remove
|
|
if (!zookeeper->exists(part_path, &stat))
|
|
return;
|
|
|
|
Coordination::Requests ops;
|
|
|
|
removePartFromZooKeeper(part_name, ops, stat.numChildren > 0);
|
|
zookeeper->multi(ops);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::removePartAndEnqueueFetch(const String & part_name)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
/// We don't know exactly what happened to broken part
|
|
/// and we are going to remove all covered log entries.
|
|
/// It's quite dangerous, so clone covered parts to detached.
|
|
auto broken_part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
|
|
|
|
auto partition_range = getDataPartsVectorInPartition(MergeTreeDataPartState::Active, broken_part_info.partition_id);
|
|
for (const auto & part : partition_range)
|
|
{
|
|
if (!broken_part_info.contains(part->info))
|
|
continue;
|
|
|
|
/// Broken part itself ether already moved to detached or does not exist.
|
|
assert(broken_part_info != part->info);
|
|
part->makeCloneInDetached("covered-by-broken", getInMemoryMetadataPtr());
|
|
}
|
|
|
|
/// It's possible that queue contains entries covered by part_name.
|
|
/// For example, we had GET_PART all_1_42_5 and MUTATE_PART all_1_42_5_63,
|
|
/// then all_1_42_5_63 was executed by fetching, but part was written to disk incorrectly.
|
|
/// In this case we have to remove it as broken and create GET_PART all_1_42_5_63 to fetch it again,
|
|
/// but GET_PART all_1_42_5 may be still in the queue.
|
|
/// We should remove all covered entries before creating GET_PART entry, because:
|
|
/// 1. In the situation described above, we do not know how to merge/mutate all_1_42_5_63 from all_1_42_5,
|
|
/// so GET_PART all_1_42_5 (and all source parts) is useless. The only thing we can do is to fetch all_1_42_5_63.
|
|
/// 2. If all_1_42_5_63 is lost, then replication may stuck waiting for all_1_42_5_63 to appear,
|
|
/// because we may have some covered parts (more precisely, parts with the same min and max blocks)
|
|
queue.removePartProducingOpsInRange(zookeeper, broken_part_info, {});
|
|
|
|
String part_path = fs::path(replica_path) / "parts" / part_name;
|
|
|
|
Coordination::Requests ops;
|
|
|
|
time_t part_create_time = 0;
|
|
Coordination::Stat stat;
|
|
if (zookeeper->exists(part_path, &stat))
|
|
{
|
|
/// Update version of /is_lost node to avoid race condition with cloneReplica(...).
|
|
/// cloneReplica(...) expects that if some entry was executed, then its new_part_name is added to /parts,
|
|
/// but we are going to remove it from /parts and add to queue again.
|
|
Coordination::Stat is_lost_stat;
|
|
String is_lost_value = zookeeper->get(replica_path + "/is_lost", &is_lost_stat);
|
|
assert(is_lost_value == "0");
|
|
ops.emplace_back(zkutil::makeSetRequest(replica_path + "/is_lost", is_lost_value, is_lost_stat.version));
|
|
|
|
part_create_time = stat.ctime / 1000;
|
|
removePartFromZooKeeper(part_name, ops, stat.numChildren > 0);
|
|
}
|
|
|
|
LogEntryPtr log_entry = std::make_shared<LogEntry>();
|
|
log_entry->type = LogEntry::GET_PART;
|
|
log_entry->create_time = part_create_time;
|
|
log_entry->source_replica = "";
|
|
log_entry->new_part_name = part_name;
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(replica_path) / "queue/queue-", log_entry->toString(),
|
|
zkutil::CreateMode::PersistentSequential));
|
|
|
|
auto results = zookeeper->multi(ops);
|
|
|
|
String path_created = dynamic_cast<const Coordination::CreateResponse &>(*results.back()).path_created;
|
|
log_entry->znode_name = path_created.substr(path_created.find_last_of('/') + 1);
|
|
queue.insert(zookeeper, log_entry);
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::startBeingLeader()
|
|
{
|
|
if (!getSettings()->replicated_can_become_leader)
|
|
{
|
|
LOG_INFO(log, "Will not enter leader election because replicated_can_become_leader=0");
|
|
return;
|
|
}
|
|
|
|
zkutil::checkNoOldLeaders(log, *current_zookeeper, fs::path(zookeeper_path) / "leader_election");
|
|
|
|
LOG_INFO(log, "Became leader");
|
|
is_leader = true;
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::stopBeingLeader()
|
|
{
|
|
if (!is_leader)
|
|
return;
|
|
|
|
LOG_INFO(log, "Stopped being leader");
|
|
is_leader = false;
|
|
}
|
|
|
|
ConnectionTimeouts StorageReplicatedMergeTree::getFetchPartHTTPTimeouts(ContextPtr local_context)
|
|
{
|
|
auto timeouts = ConnectionTimeouts::getHTTPTimeouts(local_context);
|
|
auto settings = getSettings();
|
|
|
|
if (settings->replicated_fetches_http_connection_timeout.changed)
|
|
timeouts.connection_timeout = settings->replicated_fetches_http_connection_timeout;
|
|
|
|
if (settings->replicated_fetches_http_send_timeout.changed)
|
|
timeouts.send_timeout = settings->replicated_fetches_http_send_timeout;
|
|
|
|
if (settings->replicated_fetches_http_receive_timeout.changed)
|
|
timeouts.receive_timeout = settings->replicated_fetches_http_receive_timeout;
|
|
|
|
return timeouts;
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::checkReplicaHavePart(const String & replica, const String & part_name)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
return zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "parts" / part_name);
|
|
}
|
|
|
|
String StorageReplicatedMergeTree::findReplicaHavingPart(const String & part_name, bool active)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
|
|
/// Select replicas in uniformly random order.
|
|
std::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
|
|
|
|
LOG_TRACE(log, "Candidate replicas: {}", replicas.size());
|
|
|
|
for (const String & replica : replicas)
|
|
{
|
|
/// We aren't interested in ourself.
|
|
if (replica == replica_name)
|
|
continue;
|
|
|
|
LOG_TRACE(log, "Candidate replica: {}", replica);
|
|
|
|
if (checkReplicaHavePart(replica, part_name) &&
|
|
(!active || zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active")))
|
|
return replica;
|
|
|
|
/// Obviously, replica could become inactive or even vanish after return from this method.
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
String StorageReplicatedMergeTree::findReplicaHavingCoveringPart(LogEntry & entry, bool active)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
|
|
/// Select replicas in uniformly random order.
|
|
std::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
|
|
|
|
for (const String & replica : replicas)
|
|
{
|
|
if (replica == replica_name)
|
|
continue;
|
|
|
|
if (active && !zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active"))
|
|
continue;
|
|
|
|
String largest_part_found;
|
|
Strings parts = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas" / replica / "parts");
|
|
for (const String & part_on_replica : parts)
|
|
{
|
|
if (part_on_replica == entry.new_part_name
|
|
|| MergeTreePartInfo::contains(part_on_replica, entry.new_part_name, format_version))
|
|
{
|
|
if (largest_part_found.empty()
|
|
|| MergeTreePartInfo::contains(part_on_replica, largest_part_found, format_version))
|
|
{
|
|
largest_part_found = part_on_replica;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!largest_part_found.empty())
|
|
{
|
|
bool the_same_part = largest_part_found == entry.new_part_name;
|
|
|
|
/// Make a check in case if selected part differs from source part
|
|
if (!the_same_part)
|
|
{
|
|
String reject_reason;
|
|
if (!queue.addFuturePartIfNotCoveredByThem(largest_part_found, entry, reject_reason))
|
|
{
|
|
LOG_INFO(log, "Will not fetch part {} covering {}. {}", largest_part_found, entry.new_part_name, reject_reason);
|
|
return {};
|
|
}
|
|
}
|
|
|
|
return replica;
|
|
}
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
|
|
String StorageReplicatedMergeTree::findReplicaHavingCoveringPart(
|
|
const String & part_name, bool active, String & found_part_name)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
|
|
/// Select replicas in uniformly random order.
|
|
std::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
|
|
|
|
String largest_part_found;
|
|
String largest_replica_found;
|
|
|
|
for (const String & replica : replicas)
|
|
{
|
|
if (replica == replica_name)
|
|
continue;
|
|
|
|
if (active && !zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active"))
|
|
continue;
|
|
|
|
Strings parts = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas" / replica / "parts");
|
|
for (const String & part_on_replica : parts)
|
|
{
|
|
if (part_on_replica == part_name
|
|
|| MergeTreePartInfo::contains(part_on_replica, part_name, format_version))
|
|
{
|
|
if (largest_part_found.empty()
|
|
|| MergeTreePartInfo::contains(part_on_replica, largest_part_found, format_version))
|
|
{
|
|
largest_part_found = part_on_replica;
|
|
largest_replica_found = replica;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
found_part_name = largest_part_found;
|
|
return largest_replica_found;
|
|
}
|
|
|
|
|
|
/** If a quorum is tracked for a part, update information about it in ZK.
|
|
*/
|
|
void StorageReplicatedMergeTree::updateQuorum(const String & part_name, bool is_parallel)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
/// Information on which replicas a part has been added, if the quorum has not yet been reached.
|
|
String quorum_status_path = fs::path(zookeeper_path) / "quorum" / "status";
|
|
if (is_parallel)
|
|
quorum_status_path = fs::path(zookeeper_path) / "quorum" / "parallel" / part_name;
|
|
/// The name of the previous part for which the quorum was reached.
|
|
const String quorum_last_part_path = fs::path(zookeeper_path) / "quorum" / "last_part";
|
|
|
|
String value;
|
|
Coordination::Stat stat;
|
|
|
|
/// If there is no node, then all quorum INSERTs have already reached the quorum, and nothing is needed.
|
|
while (zookeeper->tryGet(quorum_status_path, value, &stat))
|
|
{
|
|
ReplicatedMergeTreeQuorumEntry quorum_entry(value);
|
|
if (quorum_entry.part_name != part_name)
|
|
{
|
|
LOG_TRACE(log, "Quorum {}, already achieved for part {} current part {}",
|
|
quorum_status_path, part_name, quorum_entry.part_name);
|
|
/// The quorum has already been achieved. Moreover, another INSERT with a quorum has already started.
|
|
break;
|
|
}
|
|
|
|
quorum_entry.replicas.insert(replica_name);
|
|
|
|
if (quorum_entry.replicas.size() >= quorum_entry.required_number_of_replicas)
|
|
{
|
|
/// The quorum is reached. Delete the node, and update information about the last part that was successfully written with quorum.
|
|
LOG_TRACE(log, "Got {} replicas confirmed quorum {}, going to remove node",
|
|
quorum_entry.replicas.size(), quorum_status_path);
|
|
|
|
Coordination::Requests ops;
|
|
Coordination::Responses responses;
|
|
|
|
if (!is_parallel)
|
|
{
|
|
Coordination::Stat added_parts_stat;
|
|
String old_added_parts = zookeeper->get(quorum_last_part_path, &added_parts_stat);
|
|
|
|
ReplicatedMergeTreeQuorumAddedParts parts_with_quorum(format_version);
|
|
|
|
if (!old_added_parts.empty())
|
|
parts_with_quorum.fromString(old_added_parts);
|
|
|
|
auto part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
|
|
/// We store one last part which reached quorum for each partition.
|
|
parts_with_quorum.added_parts[part_info.partition_id] = part_name;
|
|
|
|
String new_added_parts = parts_with_quorum.toString();
|
|
|
|
ops.emplace_back(zkutil::makeRemoveRequest(quorum_status_path, stat.version));
|
|
ops.emplace_back(zkutil::makeSetRequest(quorum_last_part_path, new_added_parts, added_parts_stat.version));
|
|
}
|
|
else
|
|
ops.emplace_back(zkutil::makeRemoveRequest(quorum_status_path, stat.version));
|
|
|
|
auto code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZOK)
|
|
{
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZNONODE)
|
|
{
|
|
/// The quorum has already been achieved.
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// Node was updated meanwhile. We must re-read it and repeat all the actions.
|
|
continue;
|
|
}
|
|
else
|
|
throw Coordination::Exception(code, quorum_status_path);
|
|
}
|
|
else
|
|
{
|
|
LOG_TRACE(log, "Quorum {} still not satisfied (have only {} replicas), updating node",
|
|
quorum_status_path, quorum_entry.replicas.size());
|
|
/// We update the node, registering there one more replica.
|
|
auto code = zookeeper->trySet(quorum_status_path, quorum_entry.toString(), stat.version);
|
|
|
|
if (code == Coordination::Error::ZOK)
|
|
{
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZNONODE)
|
|
{
|
|
/// The quorum has already been achieved.
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// Node was updated meanwhile. We must re-read it and repeat all the actions.
|
|
continue;
|
|
}
|
|
else
|
|
throw Coordination::Exception(code, quorum_status_path);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::cleanLastPartNode(const String & partition_id)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
/// The name of the previous part for which the quorum was reached.
|
|
const String quorum_last_part_path = fs::path(zookeeper_path) / "quorum" / "last_part";
|
|
|
|
/// Delete information from "last_part" node.
|
|
|
|
while (true)
|
|
{
|
|
Coordination::Stat added_parts_stat;
|
|
String old_added_parts = zookeeper->get(quorum_last_part_path, &added_parts_stat);
|
|
|
|
ReplicatedMergeTreeQuorumAddedParts parts_with_quorum(format_version);
|
|
|
|
if (!old_added_parts.empty())
|
|
parts_with_quorum.fromString(old_added_parts);
|
|
|
|
/// Delete information about particular partition.
|
|
if (!parts_with_quorum.added_parts.count(partition_id))
|
|
{
|
|
/// There is no information about interested part.
|
|
break;
|
|
}
|
|
|
|
parts_with_quorum.added_parts.erase(partition_id);
|
|
|
|
String new_added_parts = parts_with_quorum.toString();
|
|
|
|
auto code = zookeeper->trySet(quorum_last_part_path, new_added_parts, added_parts_stat.version);
|
|
|
|
if (code == Coordination::Error::ZOK)
|
|
{
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZNONODE)
|
|
{
|
|
/// Node is deleted. It is impossible, but it is Ok.
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// Node was updated meanwhile. We must re-read it and repeat all the actions.
|
|
continue;
|
|
}
|
|
else
|
|
throw Coordination::Exception(code, quorum_last_part_path);
|
|
}
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::partIsInsertingWithParallelQuorum(const MergeTreePartInfo & part_info) const
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
return zookeeper->exists(fs::path(zookeeper_path) / "quorum" / "parallel" / part_info.getPartName());
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::partIsLastQuorumPart(const MergeTreePartInfo & part_info) const
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
const String parts_with_quorum_path = fs::path(zookeeper_path) / "quorum" / "last_part";
|
|
|
|
String parts_with_quorum_str = zookeeper->get(parts_with_quorum_path);
|
|
|
|
if (parts_with_quorum_str.empty())
|
|
return false;
|
|
|
|
ReplicatedMergeTreeQuorumAddedParts parts_with_quorum(format_version);
|
|
parts_with_quorum.fromString(parts_with_quorum_str);
|
|
|
|
auto partition_it = parts_with_quorum.added_parts.find(part_info.partition_id);
|
|
if (partition_it == parts_with_quorum.added_parts.end())
|
|
return false;
|
|
|
|
return partition_it->second == part_info.getPartName();
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::fetchPart(const String & part_name, const StorageMetadataPtr & metadata_snapshot,
|
|
const String & source_replica_path, bool to_detached, size_t quorum, zkutil::ZooKeeper::Ptr zookeeper_)
|
|
{
|
|
auto zookeeper = zookeeper_ ? zookeeper_ : getZooKeeper();
|
|
const auto part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
|
|
|
|
if (!to_detached)
|
|
{
|
|
if (auto part = getPartIfExists(part_info, {IMergeTreeDataPart::State::Outdated, IMergeTreeDataPart::State::Deleting}))
|
|
{
|
|
LOG_DEBUG(log, "Part {} should be deleted after previous attempt before fetch", part->name);
|
|
/// Force immediate parts cleanup to delete the part that was left from the previous fetch attempt.
|
|
cleanup_thread.wakeup();
|
|
return false;
|
|
}
|
|
}
|
|
|
|
{
|
|
std::lock_guard lock(currently_fetching_parts_mutex);
|
|
if (!currently_fetching_parts.insert(part_name).second)
|
|
{
|
|
LOG_DEBUG(log, "Part {} is already fetching right now", part_name);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
SCOPE_EXIT_MEMORY
|
|
({
|
|
std::lock_guard lock(currently_fetching_parts_mutex);
|
|
currently_fetching_parts.erase(part_name);
|
|
});
|
|
|
|
LOG_DEBUG(log, "Fetching part {} from {}", part_name, source_replica_path);
|
|
|
|
TableLockHolder table_lock_holder;
|
|
if (!to_detached)
|
|
table_lock_holder = lockForShare(RWLockImpl::NO_QUERY, getSettings()->lock_acquire_timeout_for_background_operations);
|
|
|
|
/// Logging
|
|
Stopwatch stopwatch;
|
|
MutableDataPartPtr part;
|
|
DataPartsVector replaced_parts;
|
|
|
|
auto write_part_log = [&] (const ExecutionStatus & execution_status)
|
|
{
|
|
writePartLog(
|
|
PartLogElement::DOWNLOAD_PART, execution_status, stopwatch.elapsed(),
|
|
part_name, part, replaced_parts, nullptr);
|
|
};
|
|
|
|
DataPartPtr part_to_clone;
|
|
{
|
|
/// If the desired part is a result of a part mutation, try to find the source part and compare
|
|
/// its checksums to the checksums of the desired part. If they match, we can just clone the local part.
|
|
|
|
/// If we have the source part, its part_info will contain covered_part_info.
|
|
auto covered_part_info = part_info;
|
|
covered_part_info.mutation = 0;
|
|
auto source_part = getActiveContainingPart(covered_part_info);
|
|
|
|
if (source_part)
|
|
{
|
|
auto source_part_header = ReplicatedMergeTreePartHeader::fromColumnsAndChecksums(
|
|
source_part->getColumns(), source_part->checksums);
|
|
|
|
String part_path = fs::path(source_replica_path) / "parts" / part_name;
|
|
String part_znode = zookeeper->get(part_path);
|
|
|
|
std::optional<ReplicatedMergeTreePartHeader> desired_part_header;
|
|
if (!part_znode.empty())
|
|
{
|
|
desired_part_header = ReplicatedMergeTreePartHeader::fromString(part_znode);
|
|
}
|
|
else
|
|
{
|
|
String columns_str;
|
|
String checksums_str;
|
|
|
|
if (zookeeper->tryGet(fs::path(part_path) / "columns", columns_str) &&
|
|
zookeeper->tryGet(fs::path(part_path) / "checksums", checksums_str))
|
|
{
|
|
desired_part_header = ReplicatedMergeTreePartHeader::fromColumnsAndChecksumsZNodes(columns_str, checksums_str);
|
|
}
|
|
else
|
|
{
|
|
LOG_INFO(log, "Not checking checksums of part {} with replica {} because part was removed from ZooKeeper", part_name, source_replica_path);
|
|
}
|
|
}
|
|
|
|
/// Checking both checksums and columns hash. For example we can have empty part
|
|
/// with same checksums but different columns. And we attaching it exception will
|
|
/// be thrown.
|
|
if (desired_part_header
|
|
&& source_part_header.getColumnsHash() == desired_part_header->getColumnsHash()
|
|
&& source_part_header.getChecksums() == desired_part_header->getChecksums())
|
|
{
|
|
LOG_TRACE(log, "Found local part {} with the same checksums and columns hash as {}", source_part->name, part_name);
|
|
part_to_clone = source_part;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
ReplicatedMergeTreeAddress address;
|
|
ConnectionTimeouts timeouts;
|
|
String interserver_scheme;
|
|
InterserverCredentialsPtr credentials;
|
|
std::optional<CurrentlySubmergingEmergingTagger> tagger_ptr;
|
|
std::function<MutableDataPartPtr()> get_part;
|
|
|
|
if (part_to_clone)
|
|
{
|
|
get_part = [&, part_to_clone]()
|
|
{
|
|
return cloneAndLoadDataPartOnSameDisk(part_to_clone, "tmp_clone_", part_info, metadata_snapshot);
|
|
};
|
|
}
|
|
else
|
|
{
|
|
address.fromString(zookeeper->get(fs::path(source_replica_path) / "host"));
|
|
timeouts = getFetchPartHTTPTimeouts(getContext());
|
|
|
|
credentials = getContext()->getInterserverCredentials();
|
|
interserver_scheme = getContext()->getInterserverScheme();
|
|
|
|
get_part = [&, address, timeouts, credentials, interserver_scheme]()
|
|
{
|
|
if (interserver_scheme != address.scheme)
|
|
throw Exception("Interserver schemes are different: '" + interserver_scheme
|
|
+ "' != '" + address.scheme + "', can't fetch part from " + address.host,
|
|
ErrorCodes::INTERSERVER_SCHEME_DOESNT_MATCH);
|
|
|
|
return fetcher.fetchPart(
|
|
metadata_snapshot,
|
|
getContext(),
|
|
part_name,
|
|
source_replica_path,
|
|
address.host,
|
|
address.replication_port,
|
|
timeouts,
|
|
credentials->getUser(),
|
|
credentials->getPassword(),
|
|
interserver_scheme,
|
|
replicated_fetches_throttler,
|
|
to_detached,
|
|
"",
|
|
&tagger_ptr,
|
|
true);
|
|
};
|
|
}
|
|
|
|
try
|
|
{
|
|
part = get_part();
|
|
|
|
if (!to_detached)
|
|
{
|
|
Transaction transaction(*this);
|
|
renameTempPartAndReplace(part, nullptr, &transaction);
|
|
|
|
replaced_parts = checkPartChecksumsAndCommit(transaction, part);
|
|
|
|
/** If a quorum is tracked for this part, you must update it.
|
|
* If you do not have time, in case of losing the session, when you restart the server - see the `ReplicatedMergeTreeRestartingThread::updateQuorumIfWeHavePart` method.
|
|
*/
|
|
if (quorum)
|
|
{
|
|
/// Check if this quorum insert is parallel or not
|
|
if (zookeeper->exists(fs::path(zookeeper_path) / "quorum" / "parallel" / part_name))
|
|
updateQuorum(part_name, true);
|
|
else if (zookeeper->exists(fs::path(zookeeper_path) / "quorum" / "status"))
|
|
updateQuorum(part_name, false);
|
|
}
|
|
|
|
/// merged parts that are still inserted with quorum. if it only contains one block, it hasn't been merged before
|
|
if (part_info.level != 0 || part_info.mutation != 0)
|
|
{
|
|
Strings quorum_parts = zookeeper->getChildren(fs::path(zookeeper_path) / "quorum" / "parallel");
|
|
for (const String & quorum_part : quorum_parts)
|
|
{
|
|
auto quorum_part_info = MergeTreePartInfo::fromPartName(quorum_part, format_version);
|
|
if (part_info.contains(quorum_part_info))
|
|
updateQuorum(quorum_part, true);
|
|
}
|
|
}
|
|
|
|
merge_selecting_task->schedule();
|
|
|
|
for (const auto & replaced_part : replaced_parts)
|
|
{
|
|
LOG_DEBUG(log, "Part {} is rendered obsolete by fetching part {}", replaced_part->name, part_name);
|
|
ProfileEvents::increment(ProfileEvents::ObsoleteReplicatedParts);
|
|
}
|
|
|
|
write_part_log({});
|
|
}
|
|
else
|
|
{
|
|
// The fetched part is valuable and should not be cleaned like a temp part.
|
|
part->is_temp = false;
|
|
part->renameTo(fs::path("detached") / part_name, true);
|
|
}
|
|
}
|
|
catch (const Exception & e)
|
|
{
|
|
/// The same part is being written right now (but probably it's not committed yet).
|
|
/// We will check the need for fetch later.
|
|
if (e.code() == ErrorCodes::DIRECTORY_ALREADY_EXISTS)
|
|
return false;
|
|
|
|
throw;
|
|
}
|
|
catch (...)
|
|
{
|
|
if (!to_detached)
|
|
write_part_log(ExecutionStatus::fromCurrentException());
|
|
|
|
throw;
|
|
}
|
|
|
|
ProfileEvents::increment(ProfileEvents::ReplicatedPartFetches);
|
|
|
|
if (part_to_clone)
|
|
LOG_DEBUG(log, "Cloned part {} from {}{}", part_name, part_to_clone->name, to_detached ? " (to 'detached' directory)" : "");
|
|
else
|
|
LOG_DEBUG(log, "Fetched part {} from {}{}", part_name, source_replica_path, to_detached ? " (to 'detached' directory)" : "");
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::fetchExistsPart(const String & part_name, const StorageMetadataPtr & metadata_snapshot,
|
|
const String & source_replica_path, DiskPtr replaced_disk, String replaced_part_path)
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
const auto part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
|
|
|
|
if (auto part = getPartIfExists(part_info, {IMergeTreeDataPart::State::Outdated, IMergeTreeDataPart::State::Deleting}))
|
|
{
|
|
LOG_DEBUG(log, "Part {} should be deleted after previous attempt before fetch", part->name);
|
|
/// Force immediate parts cleanup to delete the part that was left from the previous fetch attempt.
|
|
cleanup_thread.wakeup();
|
|
return false;
|
|
}
|
|
|
|
{
|
|
std::lock_guard lock(currently_fetching_parts_mutex);
|
|
if (!currently_fetching_parts.insert(part_name).second)
|
|
{
|
|
LOG_DEBUG(log, "Part {} is already fetching right now", part_name);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
SCOPE_EXIT_MEMORY
|
|
({
|
|
std::lock_guard lock(currently_fetching_parts_mutex);
|
|
currently_fetching_parts.erase(part_name);
|
|
});
|
|
|
|
LOG_DEBUG(log, "Fetching part {} from {}", part_name, source_replica_path);
|
|
|
|
TableLockHolder table_lock_holder = lockForShare(RWLockImpl::NO_QUERY, getSettings()->lock_acquire_timeout_for_background_operations);
|
|
|
|
/// Logging
|
|
Stopwatch stopwatch;
|
|
MutableDataPartPtr part;
|
|
DataPartsVector replaced_parts;
|
|
|
|
auto write_part_log = [&] (const ExecutionStatus & execution_status)
|
|
{
|
|
writePartLog(
|
|
PartLogElement::DOWNLOAD_PART, execution_status, stopwatch.elapsed(),
|
|
part_name, part, replaced_parts, nullptr);
|
|
};
|
|
|
|
std::function<MutableDataPartPtr()> get_part;
|
|
|
|
ReplicatedMergeTreeAddress address(zookeeper->get(fs::path(source_replica_path) / "host"));
|
|
auto timeouts = ConnectionTimeouts::getHTTPTimeouts(getContext());
|
|
auto credentials = getContext()->getInterserverCredentials();
|
|
String interserver_scheme = getContext()->getInterserverScheme();
|
|
|
|
get_part = [&, address, timeouts, interserver_scheme, credentials]()
|
|
{
|
|
if (interserver_scheme != address.scheme)
|
|
throw Exception("Interserver schemes are different: '" + interserver_scheme
|
|
+ "' != '" + address.scheme + "', can't fetch part from " + address.host,
|
|
ErrorCodes::INTERSERVER_SCHEME_DOESNT_MATCH);
|
|
|
|
return fetcher.fetchPart(
|
|
metadata_snapshot, getContext(), part_name, source_replica_path,
|
|
address.host, address.replication_port,
|
|
timeouts, credentials->getUser(), credentials->getPassword(),
|
|
interserver_scheme, replicated_fetches_throttler, false, "", nullptr, true,
|
|
replaced_disk);
|
|
};
|
|
|
|
try
|
|
{
|
|
part = get_part();
|
|
|
|
if (part->volume->getDisk()->getName() != replaced_disk->getName())
|
|
throw Exception("Part " + part->name + " fetched on wrong disk " + part->volume->getDisk()->getName(), ErrorCodes::LOGICAL_ERROR);
|
|
replaced_disk->removeFileIfExists(replaced_part_path);
|
|
replaced_disk->moveDirectory(part->getFullRelativePath(), replaced_part_path);
|
|
}
|
|
catch (const Exception & e)
|
|
{
|
|
/// The same part is being written right now (but probably it's not committed yet).
|
|
/// We will check the need for fetch later.
|
|
if (e.code() == ErrorCodes::DIRECTORY_ALREADY_EXISTS)
|
|
return false;
|
|
|
|
throw;
|
|
}
|
|
catch (...)
|
|
{
|
|
write_part_log(ExecutionStatus::fromCurrentException());
|
|
throw;
|
|
}
|
|
|
|
ProfileEvents::increment(ProfileEvents::ReplicatedPartFetches);
|
|
|
|
LOG_DEBUG(log, "Fetched part {} from {}", part_name, source_replica_path);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::startup()
|
|
{
|
|
/// Do not start replication if ZooKeeper is not configured or there is no metadata in zookeeper
|
|
if (!has_metadata_in_zookeeper.has_value() || !*has_metadata_in_zookeeper)
|
|
return;
|
|
|
|
try
|
|
{
|
|
InterserverIOEndpointPtr data_parts_exchange_ptr = std::make_shared<DataPartsExchange::Service>(*this);
|
|
[[maybe_unused]] auto prev_ptr = std::atomic_exchange(&data_parts_exchange_endpoint, data_parts_exchange_ptr);
|
|
assert(prev_ptr == nullptr);
|
|
getContext()->getInterserverIOHandler().addEndpoint(data_parts_exchange_ptr->getId(replica_path), data_parts_exchange_ptr);
|
|
|
|
startBeingLeader();
|
|
|
|
/// In this thread replica will be activated.
|
|
restarting_thread.start();
|
|
|
|
/// Wait while restarting_thread finishing initialization.
|
|
/// NOTE It does not mean that replication is actually started after receiving this event.
|
|
/// It only means that an attempt to startup replication was made.
|
|
/// Table may be still in readonly mode if this attempt failed for any reason.
|
|
startup_event.wait();
|
|
|
|
startBackgroundMovesIfNeeded();
|
|
|
|
part_moves_between_shards_orchestrator.start();
|
|
}
|
|
catch (...)
|
|
{
|
|
/// Exception safety: failed "startup" does not require a call to "shutdown" from the caller.
|
|
/// And it should be able to safely destroy table after exception in "startup" method.
|
|
/// It means that failed "startup" must not create any background tasks that we will have to wait.
|
|
try
|
|
{
|
|
shutdown();
|
|
}
|
|
catch (...)
|
|
{
|
|
std::terminate();
|
|
}
|
|
|
|
/// Note: after failed "startup", the table will be in a state that only allows to destroy the object.
|
|
throw;
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::flush()
|
|
{
|
|
if (flush_called.exchange(true))
|
|
return;
|
|
|
|
flushAllInMemoryPartsIfNeeded();
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::shutdown()
|
|
{
|
|
if (shutdown_called.exchange(true))
|
|
return;
|
|
|
|
/// Cancel fetches, merges and mutations to force the queue_task to finish ASAP.
|
|
fetcher.blocker.cancelForever();
|
|
merger_mutator.merges_blocker.cancelForever();
|
|
parts_mover.moves_blocker.cancelForever();
|
|
stopBeingLeader();
|
|
|
|
restarting_thread.shutdown();
|
|
background_operations_assignee.finish();
|
|
part_moves_between_shards_orchestrator.shutdown();
|
|
|
|
{
|
|
auto lock = queue.lockQueue();
|
|
/// Cancel logs pulling after background task were cancelled. It's still
|
|
/// required because we can trigger pullLogsToQueue during manual OPTIMIZE,
|
|
/// MUTATE, etc. query.
|
|
queue.pull_log_blocker.cancelForever();
|
|
}
|
|
background_moves_assignee.finish();
|
|
|
|
auto data_parts_exchange_ptr = std::atomic_exchange(&data_parts_exchange_endpoint, InterserverIOEndpointPtr{});
|
|
if (data_parts_exchange_ptr)
|
|
{
|
|
getContext()->getInterserverIOHandler().removeEndpointIfExists(data_parts_exchange_ptr->getId(replica_path));
|
|
/// Ask all parts exchange handlers to finish asap. New ones will fail to start
|
|
data_parts_exchange_ptr->blocker.cancelForever();
|
|
/// Wait for all of them
|
|
std::unique_lock lock(data_parts_exchange_ptr->rwlock);
|
|
}
|
|
}
|
|
|
|
|
|
StorageReplicatedMergeTree::~StorageReplicatedMergeTree()
|
|
{
|
|
try
|
|
{
|
|
shutdown();
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(__PRETTY_FUNCTION__);
|
|
}
|
|
}
|
|
|
|
|
|
ReplicatedMergeTreeQuorumAddedParts::PartitionIdToMaxBlock StorageReplicatedMergeTree::getMaxAddedBlocks() const
|
|
{
|
|
ReplicatedMergeTreeQuorumAddedParts::PartitionIdToMaxBlock max_added_blocks;
|
|
|
|
for (const auto & data_part : getDataParts())
|
|
{
|
|
max_added_blocks[data_part->info.partition_id]
|
|
= std::max(max_added_blocks[data_part->info.partition_id], data_part->info.max_block);
|
|
}
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
const String quorum_status_path = fs::path(zookeeper_path) / "quorum" / "status";
|
|
|
|
String value;
|
|
Coordination::Stat stat;
|
|
|
|
if (zookeeper->tryGet(quorum_status_path, value, &stat))
|
|
{
|
|
ReplicatedMergeTreeQuorumEntry quorum_entry;
|
|
quorum_entry.fromString(value);
|
|
|
|
auto part_info = MergeTreePartInfo::fromPartName(quorum_entry.part_name, format_version);
|
|
|
|
max_added_blocks[part_info.partition_id] = part_info.max_block - 1;
|
|
}
|
|
|
|
String added_parts_str;
|
|
if (zookeeper->tryGet(fs::path(zookeeper_path) / "quorum" / "last_part", added_parts_str))
|
|
{
|
|
if (!added_parts_str.empty())
|
|
{
|
|
ReplicatedMergeTreeQuorumAddedParts part_with_quorum(format_version);
|
|
part_with_quorum.fromString(added_parts_str);
|
|
|
|
auto added_parts = part_with_quorum.added_parts;
|
|
|
|
for (const auto & added_part : added_parts)
|
|
if (!getActiveContainingPart(added_part.second))
|
|
throw Exception(
|
|
"Replica doesn't have part " + added_part.second
|
|
+ " which was successfully written to quorum of other replicas."
|
|
" Send query to another replica or disable 'select_sequential_consistency' setting.",
|
|
ErrorCodes::REPLICA_IS_NOT_IN_QUORUM);
|
|
|
|
for (const auto & max_block : part_with_quorum.getMaxInsertedBlocks())
|
|
max_added_blocks[max_block.first] = max_block.second;
|
|
}
|
|
}
|
|
return max_added_blocks;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::read(
|
|
QueryPlan & query_plan,
|
|
const Names & column_names,
|
|
const StorageSnapshotPtr & storage_snapshot,
|
|
SelectQueryInfo & query_info,
|
|
ContextPtr local_context,
|
|
QueryProcessingStage::Enum processed_stage,
|
|
const size_t max_block_size,
|
|
const unsigned num_streams)
|
|
{
|
|
/// If true, then we will ask initiator if we can read chosen ranges
|
|
const bool enable_parallel_reading = local_context->getClientInfo().collaborate_with_initiator;
|
|
|
|
/** The `select_sequential_consistency` setting has two meanings:
|
|
* 1. To throw an exception if on a replica there are not all parts which have been written down on quorum of remaining replicas.
|
|
* 2. Do not read parts that have not yet been written to the quorum of the replicas.
|
|
* For this you have to synchronously go to ZooKeeper.
|
|
*/
|
|
if (local_context->getSettingsRef().select_sequential_consistency)
|
|
{
|
|
auto max_added_blocks = std::make_shared<ReplicatedMergeTreeQuorumAddedParts::PartitionIdToMaxBlock>(getMaxAddedBlocks());
|
|
if (auto plan = reader.read(
|
|
column_names, storage_snapshot, query_info, local_context,
|
|
max_block_size, num_streams, processed_stage, std::move(max_added_blocks), enable_parallel_reading))
|
|
query_plan = std::move(*plan);
|
|
return;
|
|
}
|
|
|
|
if (auto plan = reader.read(
|
|
column_names, storage_snapshot, query_info, local_context,
|
|
max_block_size, num_streams, processed_stage, nullptr, enable_parallel_reading))
|
|
{
|
|
query_plan = std::move(*plan);
|
|
}
|
|
}
|
|
|
|
Pipe StorageReplicatedMergeTree::read(
|
|
const Names & column_names,
|
|
const StorageSnapshotPtr & storage_snapshot,
|
|
SelectQueryInfo & query_info,
|
|
ContextPtr local_context,
|
|
QueryProcessingStage::Enum processed_stage,
|
|
const size_t max_block_size,
|
|
const unsigned num_streams)
|
|
{
|
|
QueryPlan plan;
|
|
read(plan, column_names, storage_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
|
|
return plan.convertToPipe(
|
|
QueryPlanOptimizationSettings::fromContext(local_context),
|
|
BuildQueryPipelineSettings::fromContext(local_context));
|
|
}
|
|
|
|
|
|
template <class Func>
|
|
void StorageReplicatedMergeTree::foreachActiveParts(Func && func, bool select_sequential_consistency) const
|
|
{
|
|
std::optional<ReplicatedMergeTreeQuorumAddedParts::PartitionIdToMaxBlock> max_added_blocks = {};
|
|
|
|
/**
|
|
* Synchronously go to ZooKeeper when select_sequential_consistency enabled
|
|
*/
|
|
if (select_sequential_consistency)
|
|
max_added_blocks = getMaxAddedBlocks();
|
|
|
|
auto lock = lockParts();
|
|
for (const auto & part : getDataPartsStateRange(DataPartState::Active))
|
|
{
|
|
if (part->isEmpty())
|
|
continue;
|
|
|
|
if (max_added_blocks)
|
|
{
|
|
auto blocks_iterator = max_added_blocks->find(part->info.partition_id);
|
|
if (blocks_iterator == max_added_blocks->end() || part->info.max_block > blocks_iterator->second)
|
|
continue;
|
|
}
|
|
|
|
func(part);
|
|
}
|
|
}
|
|
|
|
std::optional<UInt64> StorageReplicatedMergeTree::totalRows(const Settings & settings) const
|
|
{
|
|
UInt64 res = 0;
|
|
foreachActiveParts([&res](auto & part) { res += part->rows_count; }, settings.select_sequential_consistency);
|
|
return res;
|
|
}
|
|
|
|
std::optional<UInt64> StorageReplicatedMergeTree::totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, ContextPtr local_context) const
|
|
{
|
|
DataPartsVector parts;
|
|
foreachActiveParts([&](auto & part) { parts.push_back(part); }, local_context->getSettingsRef().select_sequential_consistency);
|
|
return totalRowsByPartitionPredicateImpl(query_info, local_context, parts);
|
|
}
|
|
|
|
std::optional<UInt64> StorageReplicatedMergeTree::totalBytes(const Settings & settings) const
|
|
{
|
|
UInt64 res = 0;
|
|
foreachActiveParts([&res](auto & part) { res += part->getBytesOnDisk(); }, settings.select_sequential_consistency);
|
|
return res;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::assertNotReadonly() const
|
|
{
|
|
if (is_readonly)
|
|
throw Exception(ErrorCodes::TABLE_IS_READ_ONLY, "Table is in readonly mode (zookeeper path: {})", zookeeper_path);
|
|
}
|
|
|
|
|
|
SinkToStoragePtr StorageReplicatedMergeTree::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
|
|
{
|
|
const auto storage_settings_ptr = getSettings();
|
|
assertNotReadonly();
|
|
|
|
const Settings & query_settings = local_context->getSettingsRef();
|
|
bool deduplicate = storage_settings_ptr->replicated_deduplication_window != 0 && query_settings.insert_deduplicate;
|
|
|
|
// TODO: should we also somehow pass list of columns to deduplicate on to the ReplicatedMergeTreeBlockOutputStream ?
|
|
return std::make_shared<ReplicatedMergeTreeSink>(
|
|
*this, metadata_snapshot, query_settings.insert_quorum,
|
|
query_settings.insert_quorum_timeout.totalMilliseconds(),
|
|
query_settings.max_partitions_per_insert_block,
|
|
query_settings.insert_quorum_parallel,
|
|
deduplicate,
|
|
local_context);
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::optimize(
|
|
const ASTPtr &,
|
|
const StorageMetadataPtr &,
|
|
const ASTPtr & partition,
|
|
bool final,
|
|
bool deduplicate,
|
|
const Names & deduplicate_by_columns,
|
|
ContextPtr query_context)
|
|
{
|
|
/// NOTE: exclusive lock cannot be used here, since this may lead to deadlock (see comments below),
|
|
/// but it should be safe to use non-exclusive to avoid dropping parts that may be required for processing queue.
|
|
auto table_lock = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
|
|
|
|
assertNotReadonly();
|
|
|
|
if (!is_leader)
|
|
throw Exception("OPTIMIZE cannot be done on this replica because it is not a leader", ErrorCodes::NOT_A_LEADER);
|
|
|
|
auto handle_noop = [&] (const String & message)
|
|
{
|
|
if (query_context->getSettingsRef().optimize_throw_if_noop)
|
|
throw Exception(message, ErrorCodes::CANNOT_ASSIGN_OPTIMIZE);
|
|
return false;
|
|
};
|
|
|
|
auto zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
const auto storage_settings_ptr = getSettings();
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
std::vector<ReplicatedMergeTreeLogEntryData> merge_entries;
|
|
|
|
auto try_assign_merge = [&](const String & partition_id) -> bool
|
|
{
|
|
constexpr size_t max_retries = 10;
|
|
size_t try_no = 0;
|
|
for (; try_no < max_retries; ++try_no)
|
|
{
|
|
/// We must select parts for merge under merge_selecting_mutex because other threads
|
|
/// (merge_selecting_thread or OPTIMIZE queries) could assign new merges.
|
|
std::lock_guard merge_selecting_lock(merge_selecting_mutex);
|
|
ReplicatedMergeTreeMergePredicate can_merge = queue.getMergePredicate(zookeeper);
|
|
|
|
auto future_merged_part = std::make_shared<FutureMergedMutatedPart>();
|
|
if (storage_settings.get()->assign_part_uuids)
|
|
future_merged_part->uuid = UUIDHelpers::generateV4();
|
|
|
|
constexpr const char * unknown_disable_reason = "unknown reason";
|
|
String disable_reason = unknown_disable_reason;
|
|
SelectPartsDecision select_decision = SelectPartsDecision::CANNOT_SELECT;
|
|
|
|
if (partition_id.empty())
|
|
{
|
|
select_decision = merger_mutator.selectPartsToMerge(
|
|
future_merged_part, /* aggressive */ true, storage_settings_ptr->max_bytes_to_merge_at_max_space_in_pool,
|
|
can_merge, /* merge_with_ttl_allowed */ false, &disable_reason);
|
|
}
|
|
else
|
|
{
|
|
select_decision = merger_mutator.selectAllPartsToMergeWithinPartition(
|
|
future_merged_part, can_merge, partition_id, final, metadata_snapshot,
|
|
&disable_reason, query_context->getSettingsRef().optimize_skip_merged_partitions);
|
|
}
|
|
|
|
/// If there is nothing to merge then we treat this merge as successful (needed for optimize final optimization)
|
|
if (select_decision == SelectPartsDecision::NOTHING_TO_MERGE)
|
|
return false;
|
|
|
|
if (select_decision != SelectPartsDecision::SELECTED)
|
|
{
|
|
constexpr const char * message_fmt = "Cannot select parts for optimization: {}";
|
|
assert(disable_reason != unknown_disable_reason);
|
|
if (!partition_id.empty())
|
|
disable_reason += fmt::format(" (in partition {})", partition_id);
|
|
String message = fmt::format(message_fmt, disable_reason);
|
|
LOG_INFO(log, fmt::runtime(message));
|
|
return handle_noop(message);
|
|
}
|
|
|
|
ReplicatedMergeTreeLogEntryData merge_entry;
|
|
CreateMergeEntryResult create_result = createLogEntryToMergeParts(
|
|
zookeeper, future_merged_part->parts,
|
|
future_merged_part->name, future_merged_part->uuid, future_merged_part->type,
|
|
deduplicate, deduplicate_by_columns,
|
|
&merge_entry, can_merge.getVersion(), future_merged_part->merge_type);
|
|
|
|
if (create_result == CreateMergeEntryResult::MissingPart)
|
|
{
|
|
String message = "Can't create merge queue node in ZooKeeper, because some parts are missing";
|
|
LOG_TRACE(log, fmt::runtime(message));
|
|
return handle_noop(message);
|
|
}
|
|
|
|
if (create_result == CreateMergeEntryResult::LogUpdated)
|
|
continue;
|
|
|
|
merge_entries.push_back(std::move(merge_entry));
|
|
return true;
|
|
}
|
|
|
|
assert(try_no == max_retries);
|
|
String message = fmt::format("Can't create merge queue node in ZooKeeper, because log was updated in every of {} tries", try_no);
|
|
LOG_TRACE(log, fmt::runtime(message));
|
|
return handle_noop(message);
|
|
};
|
|
|
|
bool assigned = false;
|
|
if (!partition && final)
|
|
{
|
|
DataPartsVector data_parts = getDataPartsVector();
|
|
std::unordered_set<String> partition_ids;
|
|
|
|
for (const DataPartPtr & part : data_parts)
|
|
partition_ids.emplace(part->info.partition_id);
|
|
|
|
for (const String & partition_id : partition_ids)
|
|
{
|
|
assigned = try_assign_merge(partition_id);
|
|
if (!assigned)
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
String partition_id;
|
|
if (partition)
|
|
partition_id = getPartitionIDFromQuery(partition, query_context);
|
|
assigned = try_assign_merge(partition_id);
|
|
}
|
|
|
|
table_lock.reset();
|
|
|
|
for (auto & merge_entry : merge_entries)
|
|
waitForLogEntryToBeProcessedIfNecessary(merge_entry, query_context);
|
|
|
|
return assigned;
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::executeMetadataAlter(const StorageReplicatedMergeTree::LogEntry & entry)
|
|
{
|
|
if (entry.alter_version < metadata_version)
|
|
{
|
|
/// TODO Can we replace it with LOGICAL_ERROR?
|
|
/// As for now, it may rerely happen due to reordering of ALTER_METADATA entries in the queue of
|
|
/// non-initial replica and also may happen after stale replica recovery.
|
|
LOG_WARNING(log, "Attempt to update metadata of version {} "
|
|
"to older version {} when processing log entry {}: {}",
|
|
metadata_version, entry.alter_version, entry.znode_name, entry.toString());
|
|
return true;
|
|
}
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
auto columns_from_entry = ColumnsDescription::parse(entry.columns_str);
|
|
auto metadata_from_entry = ReplicatedMergeTreeTableMetadata::parse(entry.metadata_str);
|
|
|
|
MergeTreeData::DataParts parts;
|
|
|
|
/// If metadata nodes have changed, we will update table structure locally.
|
|
Coordination::Requests requests;
|
|
requests.emplace_back(zkutil::makeSetRequest(fs::path(replica_path) / "columns", entry.columns_str, -1));
|
|
requests.emplace_back(zkutil::makeSetRequest(fs::path(replica_path) / "metadata", entry.metadata_str, -1));
|
|
|
|
zookeeper->multi(requests);
|
|
|
|
{
|
|
auto table_lock_holder = lockForShare(RWLockImpl::NO_QUERY, getSettings()->lock_acquire_timeout_for_background_operations);
|
|
auto alter_lock_holder = lockForAlter(getSettings()->lock_acquire_timeout_for_background_operations);
|
|
LOG_INFO(log, "Metadata changed in ZooKeeper. Applying changes locally.");
|
|
|
|
auto metadata_diff = ReplicatedMergeTreeTableMetadata(*this, getInMemoryMetadataPtr()).checkAndFindDiff(metadata_from_entry, getInMemoryMetadataPtr()->getColumns(), getContext());
|
|
setTableStructure(std::move(columns_from_entry), metadata_diff);
|
|
metadata_version = entry.alter_version;
|
|
|
|
LOG_INFO(log, "Applied changes to the metadata of the table. Current metadata version: {}", metadata_version);
|
|
}
|
|
|
|
/// This transaction may not happen, but it's OK, because on the next retry we will eventually create/update this node
|
|
zookeeper->createOrUpdate(fs::path(replica_path) / "metadata_version", std::to_string(metadata_version), zkutil::CreateMode::Persistent);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
PartitionBlockNumbersHolder StorageReplicatedMergeTree::allocateBlockNumbersInAffectedPartitions(
|
|
const MutationCommands & commands, ContextPtr query_context, const zkutil::ZooKeeperPtr & zookeeper) const
|
|
{
|
|
const std::set<String> mutation_affected_partition_ids = getPartitionIdsAffectedByCommands(commands, query_context);
|
|
|
|
if (mutation_affected_partition_ids.size() == 1)
|
|
{
|
|
const auto & affected_partition_id = *mutation_affected_partition_ids.cbegin();
|
|
auto block_number_holder = allocateBlockNumber(affected_partition_id, zookeeper);
|
|
if (!block_number_holder.has_value())
|
|
return {};
|
|
auto block_number = block_number_holder->getNumber(); /// Avoid possible UB due to std::move
|
|
return {{{affected_partition_id, block_number}}, std::move(block_number_holder)};
|
|
}
|
|
else
|
|
{
|
|
/// TODO: Implement optimal block number aqcuisition algorithm in multiple (but not all) partitions
|
|
EphemeralLocksInAllPartitions lock_holder(
|
|
fs::path(zookeeper_path) / "block_numbers", "block-", fs::path(zookeeper_path) / "temp", *zookeeper);
|
|
|
|
PartitionBlockNumbersHolder::BlockNumbersType block_numbers;
|
|
for (const auto & lock : lock_holder.getLocks())
|
|
{
|
|
if (mutation_affected_partition_ids.empty() || mutation_affected_partition_ids.count(lock.partition_id))
|
|
block_numbers[lock.partition_id] = lock.number;
|
|
}
|
|
|
|
return {std::move(block_numbers), std::move(lock_holder)};
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::alter(
|
|
const AlterCommands & commands, ContextPtr query_context, AlterLockHolder & table_lock_holder)
|
|
{
|
|
assertNotReadonly();
|
|
|
|
auto table_id = getStorageID();
|
|
|
|
if (commands.isSettingsAlter())
|
|
{
|
|
/// We don't replicate storage_settings_ptr ALTER. It's local operation.
|
|
/// Also we don't upgrade alter lock to table structure lock.
|
|
StorageInMemoryMetadata future_metadata = getInMemoryMetadata();
|
|
commands.apply(future_metadata, query_context);
|
|
|
|
merge_strategy_picker.refreshState();
|
|
|
|
changeSettings(future_metadata.settings_changes, table_lock_holder);
|
|
|
|
DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(query_context, table_id, future_metadata);
|
|
return;
|
|
}
|
|
|
|
auto ast_to_str = [](ASTPtr query) -> String
|
|
{
|
|
if (!query)
|
|
return "";
|
|
return queryToString(query);
|
|
};
|
|
|
|
const auto zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
|
|
std::optional<ReplicatedMergeTreeLogEntryData> alter_entry;
|
|
std::optional<String> mutation_znode;
|
|
|
|
while (true)
|
|
{
|
|
/// Clear nodes from previous iteration
|
|
alter_entry.emplace();
|
|
mutation_znode.reset();
|
|
|
|
auto current_metadata = getInMemoryMetadataPtr();
|
|
|
|
StorageInMemoryMetadata future_metadata = *current_metadata;
|
|
commands.apply(future_metadata, query_context);
|
|
|
|
ReplicatedMergeTreeTableMetadata future_metadata_in_zk(*this, current_metadata);
|
|
if (ast_to_str(future_metadata.sorting_key.definition_ast) != ast_to_str(current_metadata->sorting_key.definition_ast))
|
|
{
|
|
/// We serialize definition_ast as list, because code which apply ALTER (setTableStructure) expect serialized non empty expression
|
|
/// list here and we cannot change this representation for compatibility. Also we have preparsed AST `sorting_key.expression_list_ast`
|
|
/// in KeyDescription, but it contain version column for VersionedCollapsingMergeTree, which shouldn't be defined as a part of key definition AST.
|
|
/// So the best compatible way is just to convert definition_ast to list and serialize it. In all other places key.expression_list_ast should be used.
|
|
future_metadata_in_zk.sorting_key = serializeAST(*extractKeyExpressionList(future_metadata.sorting_key.definition_ast));
|
|
}
|
|
|
|
if (ast_to_str(future_metadata.sampling_key.definition_ast) != ast_to_str(current_metadata->sampling_key.definition_ast))
|
|
future_metadata_in_zk.sampling_expression = serializeAST(*extractKeyExpressionList(future_metadata.sampling_key.definition_ast));
|
|
|
|
if (ast_to_str(future_metadata.partition_key.definition_ast) != ast_to_str(current_metadata->partition_key.definition_ast))
|
|
future_metadata_in_zk.partition_key = serializeAST(*extractKeyExpressionList(future_metadata.partition_key.definition_ast));
|
|
|
|
if (ast_to_str(future_metadata.table_ttl.definition_ast) != ast_to_str(current_metadata->table_ttl.definition_ast))
|
|
{
|
|
if (future_metadata.table_ttl.definition_ast)
|
|
future_metadata_in_zk.ttl_table = serializeAST(*future_metadata.table_ttl.definition_ast);
|
|
else /// TTL was removed
|
|
future_metadata_in_zk.ttl_table = "";
|
|
}
|
|
|
|
String new_indices_str = future_metadata.secondary_indices.toString();
|
|
if (new_indices_str != current_metadata->secondary_indices.toString())
|
|
future_metadata_in_zk.skip_indices = new_indices_str;
|
|
|
|
String new_projections_str = future_metadata.projections.toString();
|
|
if (new_projections_str != current_metadata->projections.toString())
|
|
future_metadata_in_zk.projections = new_projections_str;
|
|
|
|
String new_constraints_str = future_metadata.constraints.toString();
|
|
if (new_constraints_str != current_metadata->constraints.toString())
|
|
future_metadata_in_zk.constraints = new_constraints_str;
|
|
|
|
Coordination::Requests ops;
|
|
size_t alter_path_idx = std::numeric_limits<size_t>::max();
|
|
size_t mutation_path_idx = std::numeric_limits<size_t>::max();
|
|
|
|
String new_metadata_str = future_metadata_in_zk.toString();
|
|
ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "metadata", new_metadata_str, metadata_version));
|
|
|
|
String new_columns_str = future_metadata.columns.toString();
|
|
ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "columns", new_columns_str, -1));
|
|
|
|
if (ast_to_str(current_metadata->settings_changes) != ast_to_str(future_metadata.settings_changes))
|
|
{
|
|
/// Just change settings
|
|
StorageInMemoryMetadata metadata_copy = *current_metadata;
|
|
metadata_copy.settings_changes = future_metadata.settings_changes;
|
|
changeSettings(metadata_copy.settings_changes, table_lock_holder);
|
|
DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(query_context, table_id, metadata_copy);
|
|
}
|
|
|
|
/// We can be sure, that in case of successful commit in zookeeper our
|
|
/// version will increments by 1. Because we update with version check.
|
|
int new_metadata_version = metadata_version + 1;
|
|
|
|
alter_entry->type = LogEntry::ALTER_METADATA;
|
|
alter_entry->source_replica = replica_name;
|
|
alter_entry->metadata_str = new_metadata_str;
|
|
alter_entry->columns_str = new_columns_str;
|
|
alter_entry->alter_version = new_metadata_version;
|
|
alter_entry->create_time = time(nullptr);
|
|
|
|
auto maybe_mutation_commands = commands.getMutationCommands(
|
|
*current_metadata, query_context->getSettingsRef().materialize_ttl_after_modify, query_context);
|
|
bool have_mutation = !maybe_mutation_commands.empty();
|
|
alter_entry->have_mutation = have_mutation;
|
|
|
|
alter_path_idx = ops.size();
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(zookeeper_path) / "log/log-", alter_entry->toString(), zkutil::CreateMode::PersistentSequential));
|
|
|
|
PartitionBlockNumbersHolder partition_block_numbers_holder;
|
|
if (have_mutation)
|
|
{
|
|
const String mutations_path(fs::path(zookeeper_path) / "mutations");
|
|
|
|
ReplicatedMergeTreeMutationEntry mutation_entry;
|
|
mutation_entry.alter_version = new_metadata_version;
|
|
mutation_entry.source_replica = replica_name;
|
|
mutation_entry.commands = std::move(maybe_mutation_commands);
|
|
|
|
Coordination::Stat mutations_stat;
|
|
zookeeper->get(mutations_path, &mutations_stat);
|
|
|
|
partition_block_numbers_holder =
|
|
allocateBlockNumbersInAffectedPartitions(mutation_entry.commands, query_context, zookeeper);
|
|
|
|
mutation_entry.block_numbers = partition_block_numbers_holder.getBlockNumbers();
|
|
mutation_entry.create_time = time(nullptr);
|
|
|
|
ops.emplace_back(zkutil::makeSetRequest(mutations_path, String(), mutations_stat.version));
|
|
mutation_path_idx = ops.size();
|
|
ops.emplace_back(
|
|
zkutil::makeCreateRequest(fs::path(mutations_path) / "", mutation_entry.toString(), zkutil::CreateMode::PersistentSequential));
|
|
}
|
|
|
|
if (auto txn = query_context->getZooKeeperMetadataTransaction())
|
|
{
|
|
/// It would be better to clone ops instead of moving, so we could retry on ZBADVERSION,
|
|
/// but clone() is not implemented for Coordination::Request.
|
|
txn->moveOpsTo(ops);
|
|
/// NOTE: IDatabase::alterTable(...) is called when executing ALTER_METADATA queue entry without query context,
|
|
/// so we have to update metadata of DatabaseReplicated here.
|
|
String metadata_zk_path = fs::path(txn->getDatabaseZooKeeperPath()) / "metadata" / escapeForFileName(table_id.table_name);
|
|
auto ast = DatabaseCatalog::instance().getDatabase(table_id.database_name)->getCreateTableQuery(table_id.table_name, query_context);
|
|
applyMetadataChangesToCreateQuery(ast, future_metadata);
|
|
ops.emplace_back(zkutil::makeSetRequest(metadata_zk_path, getObjectDefinitionFromCreateQuery(ast), -1));
|
|
}
|
|
|
|
Coordination::Responses results;
|
|
Coordination::Error rc = zookeeper->tryMulti(ops, results);
|
|
|
|
/// For the sake of constitency with mechanics of concurrent background process of assigning parts merge tasks
|
|
/// this placeholder must be held up until the moment of committing into ZK of the mutation entry
|
|
/// See ReplicatedMergeTreeMergePredicate::canMergeTwoParts() method
|
|
partition_block_numbers_holder.reset();
|
|
|
|
if (rc == Coordination::Error::ZOK)
|
|
{
|
|
if (have_mutation)
|
|
{
|
|
/// ALTER_METADATA record in replication /log
|
|
String alter_path = dynamic_cast<const Coordination::CreateResponse &>(*results[alter_path_idx]).path_created;
|
|
alter_entry->znode_name = alter_path.substr(alter_path.find_last_of('/') + 1);
|
|
|
|
/// ReplicatedMergeTreeMutationEntry record in /mutations
|
|
String mutation_path = dynamic_cast<const Coordination::CreateResponse &>(*results[mutation_path_idx]).path_created;
|
|
mutation_znode = mutation_path.substr(mutation_path.find_last_of('/') + 1);
|
|
}
|
|
else
|
|
{
|
|
/// ALTER_METADATA record in replication /log
|
|
String alter_path = dynamic_cast<const Coordination::CreateResponse &>(*results[alter_path_idx]).path_created;
|
|
alter_entry->znode_name = alter_path.substr(alter_path.find_last_of('/') + 1);
|
|
}
|
|
break;
|
|
}
|
|
else if (rc == Coordination::Error::ZBADVERSION)
|
|
{
|
|
if (results[0]->error != Coordination::Error::ZOK)
|
|
throw Exception("Metadata on replica is not up to date with common metadata in Zookeeper. It means that this replica still not applied some of previous alters."
|
|
" Probably too many alters executing concurrently (highly not recommended). You can retry this error",
|
|
ErrorCodes::CANNOT_ASSIGN_ALTER);
|
|
|
|
/// Cannot retry automatically, because some zookeeper ops were lost on the first attempt. Will retry on DDLWorker-level.
|
|
if (query_context->getZooKeeperMetadataTransaction())
|
|
throw Exception("Cannot execute alter, because mutations version was suddenly changed due to concurrent alter",
|
|
ErrorCodes::CANNOT_ASSIGN_ALTER);
|
|
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
throw Coordination::Exception("Alter cannot be assigned because of Zookeeper error", rc);
|
|
}
|
|
}
|
|
|
|
table_lock_holder.unlock();
|
|
|
|
LOG_DEBUG(log, "Updated shared metadata nodes in ZooKeeper. Waiting for replicas to apply changes.");
|
|
waitForLogEntryToBeProcessedIfNecessary(*alter_entry, query_context, "Some replicas doesn't finish metadata alter: ");
|
|
|
|
if (mutation_znode)
|
|
{
|
|
LOG_DEBUG(log, "Metadata changes applied. Will wait for data changes.");
|
|
waitMutation(*mutation_znode, query_context->getSettingsRef().replication_alter_partitions_sync);
|
|
LOG_DEBUG(log, "Data changes applied.");
|
|
}
|
|
}
|
|
|
|
/// If new version returns ordinary name, else returns part name containing the first and last month of the month
|
|
/// NOTE: use it in pair with getFakePartCoveringAllPartsInPartition(...)
|
|
String getPartNamePossiblyFake(MergeTreeDataFormatVersion format_version, const MergeTreePartInfo & part_info)
|
|
{
|
|
if (format_version < MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING)
|
|
{
|
|
/// The date range is all month long.
|
|
const auto & lut = DateLUT::instance();
|
|
time_t start_time = lut.YYYYMMDDToDate(parse<UInt32>(part_info.partition_id + "01"));
|
|
DayNum left_date = DayNum(lut.toDayNum(start_time).toUnderType());
|
|
DayNum right_date = DayNum(static_cast<size_t>(left_date) + lut.daysInMonth(start_time) - 1);
|
|
return part_info.getPartNameV0(left_date, right_date);
|
|
}
|
|
|
|
return part_info.getPartName();
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::getFakePartCoveringAllPartsInPartition(const String & partition_id, MergeTreePartInfo & part_info,
|
|
std::optional<EphemeralLockInZooKeeper> & delimiting_block_lock, bool for_replace_range)
|
|
{
|
|
/// Even if there is no data in the partition, you still need to mark the range for deletion.
|
|
/// - Because before executing DETACH, tasks for downloading parts to this partition can be executed.
|
|
Int64 left = 0;
|
|
|
|
/** Let's skip one number in `block_numbers` for the partition being deleted, and we will only delete parts until this number.
|
|
* This prohibits merges of deleted parts with the new inserted
|
|
* Invariant: merges of deleted parts with other parts do not appear in the log.
|
|
* NOTE: If you need to similarly support a `DROP PART` request, you will have to think of some new mechanism for it,
|
|
* to guarantee this invariant.
|
|
*/
|
|
Int64 right;
|
|
Int64 mutation_version;
|
|
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
delimiting_block_lock = allocateBlockNumber(partition_id, zookeeper);
|
|
right = delimiting_block_lock->getNumber();
|
|
/// Make sure we cover all parts in drop range.
|
|
/// There might be parts with mutation version greater than current block number
|
|
/// if some part mutation has been assigned after block number allocation, but before creation of DROP_RANGE entry.
|
|
mutation_version = MergeTreePartInfo::MAX_BLOCK_NUMBER;
|
|
}
|
|
|
|
if (for_replace_range)
|
|
{
|
|
/// NOTE Do not decrement max block number for REPLACE_RANGE, because there are invariants:
|
|
/// - drop range for REPLACE PARTITION must contain at least 2 blocks (1 skipped block and at least 1 real block)
|
|
/// - drop range for MOVE PARTITION/ATTACH PARTITION FROM always contains 1 block
|
|
|
|
/// NOTE UINT_MAX was previously used as max level for REPLACE/MOVE PARTITION (it was incorrect)
|
|
part_info = MergeTreePartInfo(partition_id, left, right, MergeTreePartInfo::MAX_LEVEL, mutation_version);
|
|
return right != 0;
|
|
}
|
|
|
|
/// Empty partition.
|
|
if (right == 0)
|
|
return false;
|
|
|
|
--right;
|
|
|
|
/// Artificial high level is chosen, to make this part "covering" all parts inside.
|
|
part_info = MergeTreePartInfo(partition_id, left, right, MergeTreePartInfo::MAX_LEVEL, mutation_version);
|
|
return true;
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::restoreMetadataInZooKeeper()
|
|
{
|
|
LOG_INFO(log, "Restoring replica metadata");
|
|
if (!is_readonly)
|
|
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Replica must be readonly");
|
|
|
|
if (getZooKeeper()->exists(replica_path))
|
|
throw Exception(ErrorCodes::BAD_ARGUMENTS,
|
|
"Replica path is present at {} - nothing to restore. "
|
|
"If you are sure that metadata is lost and that replica path contains some garbage, "
|
|
"then use SYSTEM DROP REPLICA query first.", replica_path);
|
|
|
|
if (has_metadata_in_zookeeper.has_value() && *has_metadata_in_zookeeper)
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Replica has metadata in ZooKeeper: "
|
|
"it's either a bug or it's a result of manual intervention to ZooKeeper");
|
|
|
|
if (are_restoring_replica.exchange(true))
|
|
throw Exception(ErrorCodes::CONCURRENT_ACCESS_NOT_SUPPORTED, "Replica restoration in progress");
|
|
SCOPE_EXIT({ are_restoring_replica.store(false); });
|
|
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
const DataPartsVector all_parts = getAllDataPartsVector();
|
|
Strings active_parts_names;
|
|
|
|
/// Why all parts (not only Active) are moved to detached/:
|
|
/// After ZK metadata restoration ZK resets sequential counters (including block number counters), so one may
|
|
/// potentially encounter a situation that a part we want to attach already exists.
|
|
for (const auto & part : all_parts)
|
|
{
|
|
if (part->getState() == DataPartState::Active)
|
|
active_parts_names.push_back(part->name);
|
|
|
|
forgetPartAndMoveToDetached(part);
|
|
}
|
|
|
|
LOG_INFO(log, "Moved all parts to detached/");
|
|
|
|
const bool is_first_replica = createTableIfNotExists(metadata_snapshot);
|
|
|
|
LOG_INFO(log, "Created initial ZK nodes, replica is first: {}", is_first_replica);
|
|
|
|
if (!is_first_replica)
|
|
createReplica(metadata_snapshot);
|
|
|
|
createNewZooKeeperNodes();
|
|
|
|
LOG_INFO(log, "Created ZK nodes for table");
|
|
|
|
has_metadata_in_zookeeper = true;
|
|
|
|
if (is_first_replica)
|
|
for (const String& part_name : active_parts_names)
|
|
attachPartition(std::make_shared<ASTLiteral>(part_name), metadata_snapshot, true, getContext());
|
|
|
|
LOG_INFO(log, "Attached all partitions, starting table");
|
|
|
|
startup();
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::dropPartNoWaitNoThrow(const String & part_name)
|
|
{
|
|
assertNotReadonly();
|
|
if (!is_leader)
|
|
throw Exception("DROP PART cannot be done on this replica because it is not a leader", ErrorCodes::NOT_A_LEADER);
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
LogEntry entry;
|
|
|
|
dropPartImpl(zookeeper, part_name, entry, /*detach=*/ false, /*throw_if_noop=*/ false);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::dropPart(const String & part_name, bool detach, ContextPtr query_context)
|
|
{
|
|
assertNotReadonly();
|
|
if (!is_leader)
|
|
throw Exception("DROP PART cannot be done on this replica because it is not a leader", ErrorCodes::NOT_A_LEADER);
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
LogEntry entry;
|
|
|
|
dropPartImpl(zookeeper, part_name, entry, detach, /*throw_if_noop=*/ true);
|
|
|
|
waitForLogEntryToBeProcessedIfNecessary(entry, query_context);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::dropPartition(const ASTPtr & partition, bool detach, ContextPtr query_context)
|
|
{
|
|
assertNotReadonly();
|
|
if (!is_leader)
|
|
throw Exception("DROP PARTITION cannot be done on this replica because it is not a leader", ErrorCodes::NOT_A_LEADER);
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
LogEntry entry;
|
|
|
|
String partition_id = getPartitionIDFromQuery(partition, query_context);
|
|
bool did_drop = dropAllPartsInPartition(*zookeeper, partition_id, entry, query_context, detach);
|
|
|
|
if (did_drop)
|
|
{
|
|
waitForLogEntryToBeProcessedIfNecessary(entry, query_context);
|
|
cleanLastPartNode(partition_id);
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::truncate(
|
|
const ASTPtr &, const StorageMetadataPtr &, ContextPtr query_context, TableExclusiveLockHolder & table_lock)
|
|
{
|
|
table_lock.release(); /// Truncate is done asynchronously.
|
|
|
|
assertNotReadonly();
|
|
if (!is_leader)
|
|
throw Exception("TRUNCATE cannot be done on this replica because it is not a leader", ErrorCodes::NOT_A_LEADER);
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
|
|
Strings partitions = zookeeper->getChildren(fs::path(zookeeper_path) / "block_numbers");
|
|
|
|
std::vector<std::unique_ptr<LogEntry>> entries_to_wait;
|
|
entries_to_wait.reserve(partitions.size());
|
|
for (String & partition_id : partitions)
|
|
{
|
|
auto entry = std::make_unique<LogEntry>();
|
|
if (dropAllPartsInPartition(*zookeeper, partition_id, *entry, query_context, false))
|
|
entries_to_wait.push_back(std::move(entry));
|
|
}
|
|
|
|
for (const auto & entry : entries_to_wait)
|
|
waitForLogEntryToBeProcessedIfNecessary(*entry, query_context);
|
|
}
|
|
|
|
|
|
PartitionCommandsResultInfo StorageReplicatedMergeTree::attachPartition(
|
|
const ASTPtr & partition,
|
|
const StorageMetadataPtr & metadata_snapshot,
|
|
bool attach_part,
|
|
ContextPtr query_context)
|
|
{
|
|
/// Allow ATTACH PARTITION on readonly replica when restoring it.
|
|
if (!are_restoring_replica)
|
|
assertNotReadonly();
|
|
|
|
PartitionCommandsResultInfo results;
|
|
PartsTemporaryRename renamed_parts(*this, "detached/");
|
|
MutableDataPartsVector loaded_parts = tryLoadPartsToAttach(partition, attach_part, query_context, renamed_parts);
|
|
|
|
/// TODO Allow to use quorum here.
|
|
ReplicatedMergeTreeSink output(*this, metadata_snapshot, 0, 0, 0, false, false, query_context,
|
|
/*is_attach*/true);
|
|
|
|
for (size_t i = 0; i < loaded_parts.size(); ++i)
|
|
{
|
|
const String old_name = loaded_parts[i]->name;
|
|
|
|
output.writeExistingPart(loaded_parts[i]);
|
|
|
|
renamed_parts.old_and_new_names[i].old_name.clear();
|
|
|
|
LOG_DEBUG(log, "Attached part {} as {}", old_name, loaded_parts[i]->name);
|
|
|
|
results.push_back(PartitionCommandResultInfo{
|
|
.partition_id = loaded_parts[i]->info.partition_id,
|
|
.part_name = loaded_parts[i]->name,
|
|
.old_part_name = old_name,
|
|
});
|
|
}
|
|
return results;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::checkTableCanBeDropped() const
|
|
{
|
|
auto table_id = getStorageID();
|
|
getContext()->checkTableCanBeDropped(table_id.database_name, table_id.table_name, getTotalActiveSizeInBytes());
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::checkTableCanBeRenamed() const
|
|
{
|
|
if (!allow_renaming)
|
|
throw Exception("Cannot rename Replicated table, because zookeeper_path contains implicit 'database' or 'table' macro. "
|
|
"We cannot rename path in ZooKeeper, so path may become inconsistent with table name. If you really want to rename table, "
|
|
"you should edit metadata file first and restart server or reattach the table.", ErrorCodes::NOT_IMPLEMENTED);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::rename(const String & new_path_to_table_data, const StorageID & new_table_id)
|
|
{
|
|
checkTableCanBeRenamed();
|
|
MergeTreeData::rename(new_path_to_table_data, new_table_id);
|
|
|
|
/// Update table name in zookeeper
|
|
if (!is_readonly)
|
|
{
|
|
/// We don't do it for readonly tables, because it will be updated on next table startup.
|
|
/// It is also Ok to skip ZK error for the same reason.
|
|
try
|
|
{
|
|
auto zookeeper = getZooKeeper();
|
|
zookeeper->set(fs::path(replica_path) / "host", getReplicatedMergeTreeAddress().toString());
|
|
}
|
|
catch (Coordination::Exception & e)
|
|
{
|
|
LOG_WARNING(log, "Cannot update the value of 'host' node (replica address) in ZooKeeper: {}", e.displayText());
|
|
}
|
|
}
|
|
|
|
/// TODO: You can update names of loggers.
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::existsNodeCached(const std::string & path) const
|
|
{
|
|
{
|
|
std::lock_guard lock(existing_nodes_cache_mutex);
|
|
if (existing_nodes_cache.count(path))
|
|
return true;
|
|
}
|
|
|
|
bool res = getZooKeeper()->exists(path);
|
|
|
|
if (res)
|
|
{
|
|
std::lock_guard lock(existing_nodes_cache_mutex);
|
|
existing_nodes_cache.insert(path);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
std::optional<EphemeralLockInZooKeeper>
|
|
StorageReplicatedMergeTree::allocateBlockNumber(
|
|
const String & partition_id, const zkutil::ZooKeeperPtr & zookeeper, const String & zookeeper_block_id_path, const String & zookeeper_path_prefix) const
|
|
{
|
|
String zookeeper_table_path;
|
|
if (zookeeper_path_prefix.empty())
|
|
zookeeper_table_path = zookeeper_path;
|
|
else
|
|
zookeeper_table_path = zookeeper_path_prefix;
|
|
|
|
/// Lets check for duplicates in advance, to avoid superfluous block numbers allocation
|
|
Coordination::Requests deduplication_check_ops;
|
|
if (!zookeeper_block_id_path.empty())
|
|
{
|
|
deduplication_check_ops.emplace_back(zkutil::makeCreateRequest(zookeeper_block_id_path, "", zkutil::CreateMode::Persistent));
|
|
deduplication_check_ops.emplace_back(zkutil::makeRemoveRequest(zookeeper_block_id_path, -1));
|
|
}
|
|
|
|
String block_numbers_path = fs::path(zookeeper_table_path) / "block_numbers";
|
|
String partition_path = fs::path(block_numbers_path) / partition_id;
|
|
|
|
if (!existsNodeCached(partition_path))
|
|
{
|
|
Coordination::Requests ops;
|
|
ops.push_back(zkutil::makeCreateRequest(partition_path, "", zkutil::CreateMode::Persistent));
|
|
/// We increment data version of the block_numbers node so that it becomes possible
|
|
/// to check in a ZK transaction that the set of partitions didn't change
|
|
/// (unfortunately there is no CheckChildren op).
|
|
ops.push_back(zkutil::makeSetRequest(block_numbers_path, "", -1));
|
|
|
|
Coordination::Responses responses;
|
|
Coordination::Error code = zookeeper->tryMulti(ops, responses);
|
|
if (code != Coordination::Error::ZOK && code != Coordination::Error::ZNODEEXISTS)
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
|
|
EphemeralLockInZooKeeper lock;
|
|
/// 2 RTT
|
|
try
|
|
{
|
|
lock = EphemeralLockInZooKeeper(
|
|
fs::path(partition_path) / "block-", fs::path(zookeeper_table_path) / "temp", *zookeeper, &deduplication_check_ops);
|
|
}
|
|
catch (const zkutil::KeeperMultiException & e)
|
|
{
|
|
if (e.code == Coordination::Error::ZNODEEXISTS && e.getPathForFirstFailedOp() == zookeeper_block_id_path)
|
|
return {};
|
|
|
|
throw Exception("Cannot allocate block number in ZooKeeper: " + e.displayText(), ErrorCodes::KEEPER_EXCEPTION);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
throw Exception("Cannot allocate block number in ZooKeeper: " + e.displayText(), ErrorCodes::KEEPER_EXCEPTION);
|
|
}
|
|
|
|
return {std::move(lock)};
|
|
}
|
|
|
|
|
|
Strings StorageReplicatedMergeTree::tryWaitForAllReplicasToProcessLogEntry(
|
|
const String & table_zookeeper_path, const ReplicatedMergeTreeLogEntryData & entry, Int64 wait_for_inactive_timeout)
|
|
{
|
|
LOG_DEBUG(log, "Waiting for all replicas to process {}", entry.znode_name);
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
Strings replicas = zookeeper->getChildren(fs::path(table_zookeeper_path) / "replicas");
|
|
Strings unwaited;
|
|
bool wait_for_inactive = wait_for_inactive_timeout != 0;
|
|
for (const String & replica : replicas)
|
|
{
|
|
if (wait_for_inactive || zookeeper->exists(fs::path(table_zookeeper_path) / "replicas" / replica / "is_active"))
|
|
{
|
|
if (!tryWaitForReplicaToProcessLogEntry(table_zookeeper_path, replica, entry, wait_for_inactive_timeout))
|
|
unwaited.push_back(replica);
|
|
}
|
|
else
|
|
{
|
|
unwaited.push_back(replica);
|
|
}
|
|
}
|
|
|
|
LOG_DEBUG(log, "Finished waiting for all replicas to process {}", entry.znode_name);
|
|
return unwaited;
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::waitForAllReplicasToProcessLogEntry(
|
|
const String & table_zookeeper_path, const ReplicatedMergeTreeLogEntryData & entry, Int64 wait_for_inactive_timeout, const String & error_context)
|
|
{
|
|
Strings unfinished_replicas = tryWaitForAllReplicasToProcessLogEntry(table_zookeeper_path, entry, wait_for_inactive_timeout);
|
|
if (unfinished_replicas.empty())
|
|
return;
|
|
|
|
throw Exception(ErrorCodes::UNFINISHED, "{}Timeout exceeded while waiting for replicas {} to process entry {}. "
|
|
"Probably some replicas are inactive", error_context, fmt::join(unfinished_replicas, ", "), entry.znode_name);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::waitForLogEntryToBeProcessedIfNecessary(const ReplicatedMergeTreeLogEntryData & entry, ContextPtr query_context, const String & error_context)
|
|
{
|
|
/// If necessary, wait until the operation is performed on itself or on all replicas.
|
|
Int64 wait_for_inactive_timeout = query_context->getSettingsRef().replication_wait_for_inactive_replica_timeout;
|
|
if (query_context->getSettingsRef().replication_alter_partitions_sync == 1)
|
|
{
|
|
bool finished = tryWaitForReplicaToProcessLogEntry(zookeeper_path, replica_name, entry, wait_for_inactive_timeout);
|
|
if (!finished)
|
|
{
|
|
throw Exception(ErrorCodes::UNFINISHED, "{}Log entry {} is not precessed on local replica, "
|
|
"most likely because the replica was shut down.", error_context, entry.znode_name);
|
|
}
|
|
}
|
|
else if (query_context->getSettingsRef().replication_alter_partitions_sync == 2)
|
|
{
|
|
waitForAllReplicasToProcessLogEntry(zookeeper_path, entry, wait_for_inactive_timeout, error_context);
|
|
}
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::tryWaitForReplicaToProcessLogEntry(
|
|
const String & table_zookeeper_path, const String & replica, const ReplicatedMergeTreeLogEntryData & entry, Int64 wait_for_inactive_timeout)
|
|
{
|
|
String entry_str = entry.toString();
|
|
String log_node_name;
|
|
|
|
/** Wait for entries from `log` directory (a common log, from where replicas copy entries to their queue) to be processed.
|
|
*
|
|
* The problem is that the numbers (`sequential` node) of the queue elements in `log` and in `queue` do not match.
|
|
* (And the numbers of the same log element for different replicas do not match in the `queue`.)
|
|
*/
|
|
|
|
/** First, you need to wait until replica takes `queue` element from the `log` to its queue,
|
|
* if it has not been done already (see the `pullLogsToQueue` function).
|
|
*
|
|
* To do this, check its node `log_pointer` - the maximum number of the element taken from `log` + 1.
|
|
*/
|
|
|
|
bool waiting_itself = replica == replica_name;
|
|
/// Do not wait if timeout is zero
|
|
bool wait_for_inactive = wait_for_inactive_timeout != 0;
|
|
/// Wait for unlimited time if timeout is negative
|
|
bool check_timeout = wait_for_inactive_timeout > 0;
|
|
Stopwatch time_waiting;
|
|
|
|
const auto & stop_waiting = [&]()
|
|
{
|
|
bool stop_waiting_itself = waiting_itself && partial_shutdown_called;
|
|
bool timeout_exceeded = check_timeout && wait_for_inactive_timeout < time_waiting.elapsedSeconds();
|
|
bool stop_waiting_inactive = (!wait_for_inactive || timeout_exceeded)
|
|
&& !getZooKeeper()->exists(fs::path(table_zookeeper_path) / "replicas" / replica / "is_active");
|
|
return is_dropped || stop_waiting_itself || stop_waiting_inactive;
|
|
};
|
|
|
|
/// Don't recheck ZooKeeper too often
|
|
constexpr auto event_wait_timeout_ms = 3000;
|
|
|
|
LOG_DEBUG(log, "Waiting for {} to process log entry", replica);
|
|
|
|
if (startsWith(entry.znode_name, "log-"))
|
|
{
|
|
/// Take the number from the node name `log-xxxxxxxxxx`.
|
|
UInt64 log_index = parse<UInt64>(entry.znode_name.substr(entry.znode_name.size() - 10));
|
|
log_node_name = entry.znode_name;
|
|
|
|
LOG_DEBUG(log, "Waiting for {} to pull {} to queue", replica, log_node_name);
|
|
|
|
/// Let's wait until entry gets into the replica queue.
|
|
bool pulled_to_queue = false;
|
|
do
|
|
{
|
|
zkutil::EventPtr event = std::make_shared<Poco::Event>();
|
|
|
|
String log_pointer = getZooKeeper()->get(fs::path(table_zookeeper_path) / "replicas" / replica / "log_pointer", nullptr, event);
|
|
if (!log_pointer.empty() && parse<UInt64>(log_pointer) > log_index)
|
|
{
|
|
pulled_to_queue = true;
|
|
break;
|
|
}
|
|
|
|
/// Wait with timeout because we can be already shut down, but not dropped.
|
|
/// So log_pointer node will exist, but we will never update it because all background threads already stopped.
|
|
/// It can lead to query hung because table drop query can wait for some query (alter, optimize, etc) which called this method,
|
|
/// but the query will never finish because the drop already shut down the table.
|
|
if (!stop_waiting())
|
|
event->tryWait(event_wait_timeout_ms);
|
|
} while (!stop_waiting());
|
|
|
|
if (!pulled_to_queue)
|
|
return false;
|
|
|
|
LOG_DEBUG(log, "Looking for node corresponding to {} in {} queue", log_node_name, replica);
|
|
}
|
|
else if (!entry.log_entry_id.empty())
|
|
{
|
|
/// First pass, check the table log.
|
|
/// If found in the log, wait for replica to fetch it to the queue.
|
|
/// If not found in the log, it is already in the queue.
|
|
LOG_DEBUG(log, "Looking for log entry with id `{}` in the log", entry.log_entry_id);
|
|
|
|
String log_pointer = getZooKeeper()->get(fs::path(table_zookeeper_path) / "replicas" / replica / "log_pointer");
|
|
|
|
Strings log_entries = getZooKeeper()->getChildren(fs::path(table_zookeeper_path) / "log");
|
|
UInt64 log_index = 0;
|
|
bool found = false;
|
|
|
|
for (const String & log_entry_name : log_entries)
|
|
{
|
|
log_index = parse<UInt64>(log_entry_name.substr(log_entry_name.size() - 10));
|
|
|
|
if (!log_pointer.empty() && log_index < parse<UInt64>(log_pointer))
|
|
continue;
|
|
|
|
String log_entry_str;
|
|
Coordination::Stat log_entry_stat;
|
|
bool exists = getZooKeeper()->tryGet(fs::path(table_zookeeper_path) / "log" / log_entry_name, log_entry_str, &log_entry_stat);
|
|
ReplicatedMergeTreeLogEntryData log_entry = *ReplicatedMergeTreeLogEntry::parse(log_entry_str, log_entry_stat);
|
|
if (exists && entry.log_entry_id == log_entry.log_entry_id)
|
|
{
|
|
LOG_DEBUG(log, "Found log entry with id `{}` in the log", entry.log_entry_id);
|
|
|
|
found = true;
|
|
log_node_name = log_entry_name;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found)
|
|
{
|
|
LOG_DEBUG(log, "Waiting for {} to pull {} to queue", replica, log_node_name);
|
|
|
|
/// Let's wait until entry gets into the replica queue.
|
|
bool pulled_to_queue = false;
|
|
do
|
|
{
|
|
zkutil::EventPtr event = std::make_shared<Poco::Event>();
|
|
|
|
log_pointer = getZooKeeper()->get(fs::path(table_zookeeper_path) / "replicas" / replica / "log_pointer", nullptr, event);
|
|
if (!log_pointer.empty() && parse<UInt64>(log_pointer) > log_index)
|
|
{
|
|
pulled_to_queue = true;
|
|
break;
|
|
}
|
|
|
|
/// Wait with timeout because we can be already shut down, but not dropped.
|
|
/// So log_pointer node will exist, but we will never update it because all background threads already stopped.
|
|
/// It can lead to query hung because table drop query can wait for some query (alter, optimize, etc) which called this method,
|
|
/// but the query will never finish because the drop already shut down the table.
|
|
if (!stop_waiting())
|
|
event->tryWait(event_wait_timeout_ms);
|
|
} while (!stop_waiting());
|
|
|
|
if (!pulled_to_queue)
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
throw Exception("Logical error: unexpected name of log node: " + entry.znode_name, ErrorCodes::LOGICAL_ERROR);
|
|
}
|
|
|
|
/** Second - find the corresponding entry in the queue of the specified replica.
|
|
* Its number may not match the `log` node. Therefore, we search by comparing the content.
|
|
*/
|
|
|
|
Strings queue_entries = getZooKeeper()->getChildren(fs::path(table_zookeeper_path) / "replicas" / replica / "queue");
|
|
String queue_entry_to_wait_for;
|
|
|
|
for (const String & entry_name : queue_entries)
|
|
{
|
|
String queue_entry_str;
|
|
Coordination::Stat queue_entry_stat;
|
|
bool exists = getZooKeeper()->tryGet(fs::path(table_zookeeper_path) / "replicas" / replica / "queue" / entry_name, queue_entry_str, &queue_entry_stat);
|
|
if (exists && queue_entry_str == entry_str)
|
|
{
|
|
queue_entry_to_wait_for = entry_name;
|
|
break;
|
|
}
|
|
else if (!entry.log_entry_id.empty())
|
|
{
|
|
/// Check if the id matches rather than just contents. This entry
|
|
/// might have been written by different ClickHouse versions and
|
|
/// it is hard to guarantee same text representation.
|
|
ReplicatedMergeTreeLogEntryData queue_entry = *ReplicatedMergeTreeLogEntry::parse(queue_entry_str, queue_entry_stat);
|
|
if (entry.log_entry_id == queue_entry.log_entry_id)
|
|
{
|
|
queue_entry_to_wait_for = entry_name;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// While looking for the record, it has already been executed and deleted.
|
|
if (queue_entry_to_wait_for.empty())
|
|
{
|
|
LOG_DEBUG(log, "No corresponding node found. Assuming it has been already processed. Found {} nodes", queue_entries.size());
|
|
return true;
|
|
}
|
|
|
|
LOG_DEBUG(log, "Waiting for {} to disappear from {} queue", queue_entry_to_wait_for, replica);
|
|
|
|
/// Third - wait until the entry disappears from the replica queue or replica become inactive.
|
|
String path_to_wait_on = fs::path(table_zookeeper_path) / "replicas" / replica / "queue" / queue_entry_to_wait_for;
|
|
|
|
return getZooKeeper()->waitForDisappear(path_to_wait_on, stop_waiting);
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::getStatus(Status & res, bool with_zk_fields)
|
|
{
|
|
auto zookeeper = tryGetZooKeeper();
|
|
const auto storage_settings_ptr = getSettings();
|
|
|
|
res.is_leader = is_leader;
|
|
res.can_become_leader = storage_settings_ptr->replicated_can_become_leader;
|
|
res.is_readonly = is_readonly;
|
|
res.is_session_expired = !zookeeper || zookeeper->expired();
|
|
|
|
res.queue = queue.getStatus();
|
|
res.absolute_delay = getAbsoluteDelay(); /// NOTE: may be slightly inconsistent with queue status.
|
|
|
|
res.parts_to_check = part_check_thread.size();
|
|
|
|
res.zookeeper_path = zookeeper_path;
|
|
res.replica_name = replica_name;
|
|
res.replica_path = replica_path;
|
|
res.columns_version = -1;
|
|
|
|
res.log_max_index = 0;
|
|
res.log_pointer = 0;
|
|
res.total_replicas = 0;
|
|
res.active_replicas = 0;
|
|
res.last_queue_update_exception = getLastQueueUpdateException();
|
|
|
|
if (with_zk_fields && !res.is_session_expired)
|
|
{
|
|
try
|
|
{
|
|
auto log_entries = zookeeper->getChildren(fs::path(zookeeper_path) / "log");
|
|
|
|
if (!log_entries.empty())
|
|
{
|
|
const String & last_log_entry = *std::max_element(log_entries.begin(), log_entries.end());
|
|
res.log_max_index = parse<UInt64>(last_log_entry.substr(strlen("log-")));
|
|
}
|
|
|
|
String log_pointer_str = zookeeper->get(fs::path(replica_path) / "log_pointer");
|
|
res.log_pointer = log_pointer_str.empty() ? 0 : parse<UInt64>(log_pointer_str);
|
|
|
|
auto all_replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
res.total_replicas = all_replicas.size();
|
|
|
|
for (const String & replica : all_replicas)
|
|
{
|
|
bool is_replica_active = zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active");
|
|
res.active_replicas += static_cast<UInt8>(is_replica_active);
|
|
res.replica_is_active.emplace(replica, is_replica_active);
|
|
}
|
|
}
|
|
catch (const Coordination::Exception &)
|
|
{
|
|
res.zookeeper_exception = getCurrentExceptionMessage(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::getQueue(LogEntriesData & res, String & replica_name_)
|
|
{
|
|
replica_name_ = replica_name;
|
|
queue.getEntries(res);
|
|
}
|
|
|
|
std::vector<PartMovesBetweenShardsOrchestrator::Entry> StorageReplicatedMergeTree::getPartMovesBetweenShardsEntries()
|
|
{
|
|
return part_moves_between_shards_orchestrator.getEntries();
|
|
}
|
|
|
|
time_t StorageReplicatedMergeTree::getAbsoluteDelay() const
|
|
{
|
|
time_t min_unprocessed_insert_time = 0;
|
|
time_t max_processed_insert_time = 0;
|
|
queue.getInsertTimes(min_unprocessed_insert_time, max_processed_insert_time);
|
|
|
|
/// Load start time, then finish time to avoid reporting false delay when start time is updated
|
|
/// between loading of two variables.
|
|
time_t queue_update_start_time = last_queue_update_start_time.load();
|
|
time_t queue_update_finish_time = last_queue_update_finish_time.load();
|
|
|
|
time_t current_time = time(nullptr);
|
|
|
|
if (!queue_update_finish_time)
|
|
{
|
|
/// We have not updated queue even once yet (perhaps replica is readonly).
|
|
/// As we have no info about the current state of replication log, return effectively infinite delay.
|
|
return current_time;
|
|
}
|
|
else if (min_unprocessed_insert_time)
|
|
{
|
|
/// There are some unprocessed insert entries in queue.
|
|
return (current_time > min_unprocessed_insert_time) ? (current_time - min_unprocessed_insert_time) : 0;
|
|
}
|
|
else if (queue_update_start_time > queue_update_finish_time)
|
|
{
|
|
/// Queue is empty, but there are some in-flight or failed queue update attempts
|
|
/// (likely because of problems with connecting to ZooKeeper).
|
|
/// Return the time passed since last attempt.
|
|
return (current_time > queue_update_start_time) ? (current_time - queue_update_start_time) : 0;
|
|
}
|
|
else
|
|
{
|
|
/// Everything is up-to-date.
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::getReplicaDelays(time_t & out_absolute_delay, time_t & out_relative_delay)
|
|
{
|
|
assertNotReadonly();
|
|
|
|
time_t current_time = time(nullptr);
|
|
|
|
out_absolute_delay = getAbsoluteDelay();
|
|
out_relative_delay = 0;
|
|
const auto storage_settings_ptr = getSettings();
|
|
|
|
/** Relative delay is the maximum difference of absolute delay from any other replica,
|
|
* (if this replica lags behind any other live replica, or zero, otherwise).
|
|
* Calculated only if the absolute delay is large enough.
|
|
*/
|
|
|
|
if (out_absolute_delay < static_cast<time_t>(storage_settings_ptr->min_relative_delay_to_measure))
|
|
return;
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
time_t max_replicas_unprocessed_insert_time = 0;
|
|
bool have_replica_with_nothing_unprocessed = false;
|
|
|
|
Strings replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
|
|
for (const auto & replica : replicas)
|
|
{
|
|
if (replica == replica_name)
|
|
continue;
|
|
|
|
/// Skip dead replicas.
|
|
if (!zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active"))
|
|
continue;
|
|
|
|
String value;
|
|
if (!zookeeper->tryGet(fs::path(zookeeper_path) / "replicas" / replica / "min_unprocessed_insert_time", value))
|
|
continue;
|
|
|
|
time_t replica_time = value.empty() ? 0 : parse<time_t>(value);
|
|
|
|
if (replica_time == 0)
|
|
{
|
|
/** Note
|
|
* The conclusion that the replica does not lag may be incorrect,
|
|
* because the information about `min_unprocessed_insert_time` is taken
|
|
* only from that part of the log that has been moved to the queue.
|
|
* If the replica for some reason has stalled `queueUpdatingTask`,
|
|
* then `min_unprocessed_insert_time` will be incorrect.
|
|
*/
|
|
|
|
have_replica_with_nothing_unprocessed = true;
|
|
break;
|
|
}
|
|
|
|
if (replica_time > max_replicas_unprocessed_insert_time)
|
|
max_replicas_unprocessed_insert_time = replica_time;
|
|
}
|
|
|
|
if (have_replica_with_nothing_unprocessed)
|
|
out_relative_delay = out_absolute_delay;
|
|
else
|
|
{
|
|
max_replicas_unprocessed_insert_time = std::min(current_time, max_replicas_unprocessed_insert_time);
|
|
time_t min_replicas_delay = current_time - max_replicas_unprocessed_insert_time;
|
|
if (out_absolute_delay > min_replicas_delay)
|
|
out_relative_delay = out_absolute_delay - min_replicas_delay;
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::fetchPartition(
|
|
const ASTPtr & partition,
|
|
const StorageMetadataPtr & metadata_snapshot,
|
|
const String & from_,
|
|
bool fetch_part,
|
|
ContextPtr query_context)
|
|
{
|
|
Macros::MacroExpansionInfo info;
|
|
info.expand_special_macros_only = false; //-V1048
|
|
info.table_id = getStorageID();
|
|
info.table_id.uuid = UUIDHelpers::Nil;
|
|
auto expand_from = query_context->getMacros()->expand(from_, info);
|
|
String auxiliary_zookeeper_name = zkutil::extractZooKeeperName(expand_from);
|
|
String from = zkutil::extractZooKeeperPath(expand_from, /* check_starts_with_slash */ true);
|
|
if (from.empty())
|
|
throw Exception("ZooKeeper path should not be empty", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
|
|
|
zkutil::ZooKeeperPtr zookeeper;
|
|
if (auxiliary_zookeeper_name != default_zookeeper_name)
|
|
zookeeper = getContext()->getAuxiliaryZooKeeper(auxiliary_zookeeper_name);
|
|
else
|
|
zookeeper = getZooKeeper();
|
|
|
|
if (from.back() == '/')
|
|
from.resize(from.size() - 1);
|
|
|
|
if (fetch_part)
|
|
{
|
|
String part_name = partition->as<ASTLiteral &>().value.safeGet<String>();
|
|
auto part_path = findReplicaHavingPart(part_name, from, zookeeper);
|
|
|
|
if (part_path.empty())
|
|
throw Exception(ErrorCodes::NO_REPLICA_HAS_PART, "Part {} does not exist on any replica", part_name);
|
|
/** Let's check that there is no such part in the `detached` directory (where we will write the downloaded parts).
|
|
* Unreliable (there is a race condition) - such a part may appear a little later.
|
|
*/
|
|
if (checkIfDetachedPartExists(part_name))
|
|
throw Exception(ErrorCodes::DUPLICATE_DATA_PART, "Detached part " + part_name + " already exists.");
|
|
LOG_INFO(log, "Will fetch part {} from shard {} (zookeeper '{}')", part_name, from_, auxiliary_zookeeper_name);
|
|
|
|
try
|
|
{
|
|
/// part name , metadata, part_path , true, 0, zookeeper
|
|
if (!fetchPart(part_name, metadata_snapshot, part_path, true, 0, zookeeper))
|
|
throw Exception(ErrorCodes::UNFINISHED, "Failed to fetch part {} from {}", part_name, from_);
|
|
}
|
|
catch (const DB::Exception & e)
|
|
{
|
|
if (e.code() != ErrorCodes::RECEIVED_ERROR_FROM_REMOTE_IO_SERVER && e.code() != ErrorCodes::RECEIVED_ERROR_TOO_MANY_REQUESTS
|
|
&& e.code() != ErrorCodes::CANNOT_READ_ALL_DATA)
|
|
throw;
|
|
|
|
LOG_INFO(log, fmt::runtime(e.displayText()));
|
|
}
|
|
return;
|
|
}
|
|
|
|
String partition_id = getPartitionIDFromQuery(partition, query_context);
|
|
LOG_INFO(log, "Will fetch partition {} from shard {} (zookeeper '{}')", partition_id, from_, auxiliary_zookeeper_name);
|
|
|
|
/** Let's check that there is no such partition in the `detached` directory (where we will write the downloaded parts).
|
|
* Unreliable (there is a race condition) - such a partition may appear a little later.
|
|
*/
|
|
if (checkIfDetachedPartitionExists(partition_id))
|
|
throw Exception("Detached partition " + partition_id + " already exists.", ErrorCodes::PARTITION_ALREADY_EXISTS);
|
|
|
|
zkutil::Strings replicas;
|
|
zkutil::Strings active_replicas;
|
|
String best_replica;
|
|
|
|
{
|
|
|
|
/// List of replicas of source shard.
|
|
replicas = zookeeper->getChildren(fs::path(from) / "replicas");
|
|
|
|
/// Leave only active replicas.
|
|
active_replicas.reserve(replicas.size());
|
|
|
|
for (const String & replica : replicas)
|
|
if (zookeeper->exists(fs::path(from) / "replicas" / replica / "is_active"))
|
|
active_replicas.push_back(replica);
|
|
|
|
if (active_replicas.empty())
|
|
throw Exception("No active replicas for shard " + from, ErrorCodes::NO_ACTIVE_REPLICAS);
|
|
|
|
/** You must select the best (most relevant) replica.
|
|
* This is a replica with the maximum `log_pointer`, then with the minimum `queue` size.
|
|
* NOTE This is not exactly the best criteria. It does not make sense to download old partitions,
|
|
* and it would be nice to be able to choose the replica closest by network.
|
|
* NOTE Of course, there are data races here. You can solve it by retrying.
|
|
*/
|
|
Int64 max_log_pointer = -1;
|
|
UInt64 min_queue_size = std::numeric_limits<UInt64>::max();
|
|
|
|
for (const String & replica : active_replicas)
|
|
{
|
|
String current_replica_path = fs::path(from) / "replicas" / replica;
|
|
|
|
String log_pointer_str = zookeeper->get(fs::path(current_replica_path) / "log_pointer");
|
|
Int64 log_pointer = log_pointer_str.empty() ? 0 : parse<UInt64>(log_pointer_str);
|
|
|
|
Coordination::Stat stat;
|
|
zookeeper->get(fs::path(current_replica_path) / "queue", &stat);
|
|
size_t queue_size = stat.numChildren;
|
|
|
|
if (log_pointer > max_log_pointer
|
|
|| (log_pointer == max_log_pointer && queue_size < min_queue_size))
|
|
{
|
|
max_log_pointer = log_pointer;
|
|
min_queue_size = queue_size;
|
|
best_replica = replica;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (best_replica.empty())
|
|
throw Exception("Logical error: cannot choose best replica.", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
LOG_INFO(log, "Found {} replicas, {} of them are active. Selected {} to fetch from.", replicas.size(), active_replicas.size(), best_replica);
|
|
|
|
String best_replica_path = fs::path(from) / "replicas" / best_replica;
|
|
|
|
/// Let's find out which parts are on the best replica.
|
|
|
|
/** Trying to download these parts.
|
|
* Some of them could be deleted due to the merge.
|
|
* In this case, update the information about the available parts and try again.
|
|
*/
|
|
|
|
unsigned try_no = 0;
|
|
Strings missing_parts;
|
|
do
|
|
{
|
|
if (try_no)
|
|
LOG_INFO(log, "Some of parts ({}) are missing. Will try to fetch covering parts.", missing_parts.size());
|
|
|
|
if (try_no >= query_context->getSettings().max_fetch_partition_retries_count)
|
|
throw Exception("Too many retries to fetch parts from " + best_replica_path, ErrorCodes::TOO_MANY_RETRIES_TO_FETCH_PARTS);
|
|
|
|
Strings parts = zookeeper->getChildren(fs::path(best_replica_path) / "parts");
|
|
ActiveDataPartSet active_parts_set(format_version, parts);
|
|
Strings parts_to_fetch;
|
|
|
|
if (missing_parts.empty())
|
|
{
|
|
parts_to_fetch = active_parts_set.getParts();
|
|
|
|
/// Leaving only the parts of the desired partition.
|
|
Strings parts_to_fetch_partition;
|
|
for (const String & part : parts_to_fetch)
|
|
{
|
|
if (MergeTreePartInfo::fromPartName(part, format_version).partition_id == partition_id)
|
|
parts_to_fetch_partition.push_back(part);
|
|
}
|
|
|
|
parts_to_fetch = std::move(parts_to_fetch_partition);
|
|
|
|
if (parts_to_fetch.empty())
|
|
throw Exception("Partition " + partition_id + " on " + best_replica_path + " doesn't exist", ErrorCodes::PARTITION_DOESNT_EXIST);
|
|
}
|
|
else
|
|
{
|
|
for (const String & missing_part : missing_parts)
|
|
{
|
|
String containing_part = active_parts_set.getContainingPart(missing_part);
|
|
if (!containing_part.empty())
|
|
parts_to_fetch.push_back(containing_part);
|
|
else
|
|
LOG_WARNING(log, "Part {} on replica {} has been vanished.", missing_part, best_replica_path);
|
|
}
|
|
}
|
|
|
|
LOG_INFO(log, "Parts to fetch: {}", parts_to_fetch.size());
|
|
|
|
missing_parts.clear();
|
|
for (const String & part : parts_to_fetch)
|
|
{
|
|
bool fetched = false;
|
|
|
|
try
|
|
{
|
|
fetched = fetchPart(part, metadata_snapshot, best_replica_path, true, 0, zookeeper);
|
|
}
|
|
catch (const DB::Exception & e)
|
|
{
|
|
if (e.code() != ErrorCodes::RECEIVED_ERROR_FROM_REMOTE_IO_SERVER && e.code() != ErrorCodes::RECEIVED_ERROR_TOO_MANY_REQUESTS
|
|
&& e.code() != ErrorCodes::CANNOT_READ_ALL_DATA)
|
|
throw;
|
|
|
|
LOG_INFO(log, fmt::runtime(e.displayText()));
|
|
}
|
|
|
|
if (!fetched)
|
|
missing_parts.push_back(part);
|
|
}
|
|
|
|
++try_no;
|
|
} while (!missing_parts.empty());
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::mutate(const MutationCommands & commands, ContextPtr query_context)
|
|
{
|
|
/// Overview of the mutation algorithm.
|
|
///
|
|
/// When the client executes a mutation, this method is called. It acquires block numbers in all
|
|
/// partitions, saves them in the mutation entry and writes the mutation entry to a new ZK node in
|
|
/// the /mutations folder. This block numbers are needed to determine which parts should be mutated and
|
|
/// which shouldn't (parts inserted after the mutation will have the block number higher than the
|
|
/// block number acquired by the mutation in that partition and so will not be mutatied).
|
|
/// This block number is called "mutation version" in that partition.
|
|
///
|
|
/// Mutation versions are acquired atomically in all partitions, so the case when an insert in some
|
|
/// partition has the block number higher than the mutation version but the following insert into another
|
|
/// partition acquires the block number lower than the mutation version in that partition is impossible.
|
|
/// Another important invariant: mutation entries appear in /mutations in the order of their mutation
|
|
/// versions (in any partition). This means that mutations form a sequence and we can execute them in
|
|
/// the order of their mutation versions and not worry that some mutation with the smaller version
|
|
/// will suddenly appear.
|
|
///
|
|
/// During mutations individual parts are immutable - when we want to change the contents of a part
|
|
/// we prepare the new part and add it to MergeTreeData (the original part gets replaced). The fact that
|
|
/// we have mutated the part is recorded in the part->info.mutation field of MergeTreePartInfo.
|
|
/// The relation with the original part is preserved because the new part covers the same block range
|
|
/// as the original one.
|
|
///
|
|
/// We then can for each part determine its "mutation version": the version of the last mutation in
|
|
/// the mutation sequence that we regard as already applied to that part. All mutations with the greater
|
|
/// version number will still need to be applied to that part.
|
|
///
|
|
/// Execution of mutations is done asynchronously. All replicas watch the /mutations directory and
|
|
/// load new mutation entries as they appear (see mutationsUpdatingTask()). Next we need to determine
|
|
/// how to mutate individual parts consistently with part merges. This is done by the leader replica
|
|
/// (see mergeSelectingTask() and class ReplicatedMergeTreeMergePredicate for details). Important
|
|
/// invariants here are that a) all source parts for a single merge must have the same mutation version
|
|
/// and b) any part can be mutated only once or merged only once (e.g. once we have decided to mutate
|
|
/// a part then we need to execute that mutation and can assign merges only to the new part and not to the
|
|
/// original part). Multiple consecutive mutations can be executed at once (without writing the
|
|
/// intermediate result to a part).
|
|
///
|
|
/// Leader replica records its decisions to the replication log (/log directory in ZK) in the form of
|
|
/// MUTATE_PART entries and all replicas then execute them in the background pool
|
|
/// (see MutateTask class). When a replica encounters a MUTATE_PART command, it is
|
|
/// guaranteed that the corresponding mutation entry is already loaded (when we pull entries from
|
|
/// replication log into the replica queue, we also load mutation entries). Note that just as with merges
|
|
/// the replica can decide not to do the mutation locally and fetch the mutated part from another replica
|
|
/// instead.
|
|
///
|
|
/// Mutations of individual parts are in fact pretty similar to merges, e.g. their assignment and execution
|
|
/// is governed by the same storage_settings. TODO: support a single "merge-mutation" operation when the data
|
|
/// read from the the source parts is first mutated on the fly to some uniform mutation version and then
|
|
/// merged to a resulting part.
|
|
///
|
|
/// After all needed parts are mutated (i.e. all active parts have the mutation version greater than
|
|
/// the version of this mutation), the mutation is considered done and can be deleted.
|
|
|
|
ReplicatedMergeTreeMutationEntry mutation_entry;
|
|
mutation_entry.source_replica = replica_name;
|
|
mutation_entry.commands = commands;
|
|
|
|
const String mutations_path = fs::path(zookeeper_path) / "mutations";
|
|
const auto zookeeper = getZooKeeper();
|
|
|
|
/// Update the mutations_path node when creating the mutation and check its version to ensure that
|
|
/// nodes for mutations are created in the same order as the corresponding block numbers.
|
|
/// Should work well if the number of concurrent mutation requests is small.
|
|
while (true)
|
|
{
|
|
Coordination::Stat mutations_stat;
|
|
zookeeper->get(mutations_path, &mutations_stat);
|
|
|
|
PartitionBlockNumbersHolder partition_block_numbers_holder =
|
|
allocateBlockNumbersInAffectedPartitions(mutation_entry.commands, query_context, zookeeper);
|
|
|
|
mutation_entry.block_numbers = partition_block_numbers_holder.getBlockNumbers();
|
|
mutation_entry.create_time = time(nullptr);
|
|
|
|
/// The following version check guarantees the linearizability property for any pair of mutations:
|
|
/// mutation with higher sequence number is guaranteed to have higher block numbers in every partition
|
|
/// (and thus will be applied strictly according to sequence numbers of mutations)
|
|
Coordination::Requests requests;
|
|
requests.emplace_back(zkutil::makeSetRequest(mutations_path, String(), mutations_stat.version));
|
|
requests.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(mutations_path) / "", mutation_entry.toString(), zkutil::CreateMode::PersistentSequential));
|
|
|
|
if (auto txn = query_context->getZooKeeperMetadataTransaction())
|
|
txn->moveOpsTo(requests);
|
|
|
|
Coordination::Responses responses;
|
|
Coordination::Error rc = zookeeper->tryMulti(requests, responses);
|
|
|
|
partition_block_numbers_holder.reset();
|
|
|
|
if (rc == Coordination::Error::ZOK)
|
|
{
|
|
const String & path_created =
|
|
dynamic_cast<const Coordination::CreateResponse *>(responses[1].get())->path_created;
|
|
mutation_entry.znode_name = path_created.substr(path_created.find_last_of('/') + 1);
|
|
LOG_TRACE(log, "Created mutation with ID {}", mutation_entry.znode_name);
|
|
break;
|
|
}
|
|
else if (rc == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// Cannot retry automatically, because some zookeeper ops were lost on the first attempt. Will retry on DDLWorker-level.
|
|
if (query_context->getZooKeeperMetadataTransaction())
|
|
throw Exception("Cannot execute alter, because mutations version was suddenly changed due to concurrent alter",
|
|
ErrorCodes::CANNOT_ASSIGN_ALTER);
|
|
LOG_TRACE(log, "Version conflict when trying to create a mutation node, retrying...");
|
|
continue;
|
|
}
|
|
else
|
|
throw Coordination::Exception("Unable to create a mutation znode", rc);
|
|
}
|
|
|
|
waitMutation(mutation_entry.znode_name, query_context->getSettingsRef().mutations_sync);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::waitMutation(const String & znode_name, size_t mutations_sync) const
|
|
{
|
|
if (!mutations_sync)
|
|
return;
|
|
|
|
/// we have to wait
|
|
auto zookeeper = getZooKeeper();
|
|
Strings replicas;
|
|
if (mutations_sync == 2) /// wait for all replicas
|
|
{
|
|
replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
|
|
/// This replica should be first, to ensure that the mutation will be loaded into memory
|
|
for (auto it = replicas.begin(); it != replicas.end(); ++it)
|
|
{
|
|
if (*it == replica_name)
|
|
{
|
|
std::iter_swap(it, replicas.rbegin());
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else if (mutations_sync == 1) /// just wait for ourself
|
|
replicas.push_back(replica_name);
|
|
|
|
waitMutationToFinishOnReplicas(replicas, znode_name);
|
|
}
|
|
|
|
std::vector<MergeTreeMutationStatus> StorageReplicatedMergeTree::getMutationsStatus() const
|
|
{
|
|
return queue.getMutationsStatus();
|
|
}
|
|
|
|
CancellationCode StorageReplicatedMergeTree::killMutation(const String & mutation_id)
|
|
{
|
|
assertNotReadonly();
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
|
|
LOG_INFO(log, "Killing mutation {}", mutation_id);
|
|
|
|
auto mutation_entry = queue.removeMutation(zookeeper, mutation_id);
|
|
if (!mutation_entry)
|
|
return CancellationCode::NotFound;
|
|
|
|
/// After this point no new part mutations will start and part mutations that still exist
|
|
/// in the queue will be skipped.
|
|
|
|
/// Cancel already running part mutations.
|
|
for (const auto & pair : mutation_entry->block_numbers)
|
|
{
|
|
const String & partition_id = pair.first;
|
|
Int64 block_number = pair.second;
|
|
getContext()->getMergeList().cancelPartMutations(getStorageID(), partition_id, block_number);
|
|
}
|
|
return CancellationCode::CancelSent;
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::clearOldPartsAndRemoveFromZK()
|
|
{
|
|
auto table_lock = lockForShare(
|
|
RWLockImpl::NO_QUERY, getSettings()->lock_acquire_timeout_for_background_operations);
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
DataPartsVector parts = grabOldParts();
|
|
if (parts.empty())
|
|
return;
|
|
|
|
DataPartsVector parts_to_delete_only_from_filesystem; // Only duplicates
|
|
DataPartsVector parts_to_delete_completely; // All parts except duplicates
|
|
DataPartsVector parts_to_retry_deletion; // Parts that should be retried due to network problems
|
|
DataPartsVector parts_to_remove_from_filesystem; // Parts removed from ZK
|
|
|
|
for (const auto & part : parts)
|
|
{
|
|
if (!part->is_duplicate)
|
|
parts_to_delete_completely.emplace_back(part);
|
|
else
|
|
parts_to_delete_only_from_filesystem.emplace_back(part);
|
|
}
|
|
parts.clear();
|
|
|
|
/// Delete duplicate parts from filesystem
|
|
if (!parts_to_delete_only_from_filesystem.empty())
|
|
{
|
|
clearPartsFromFilesystem(parts_to_delete_only_from_filesystem);
|
|
removePartsFinally(parts_to_delete_only_from_filesystem);
|
|
|
|
LOG_DEBUG(log, "Removed {} old duplicate parts", parts_to_delete_only_from_filesystem.size());
|
|
}
|
|
|
|
/// Delete normal parts from ZooKeeper
|
|
NameSet part_names_to_retry_deletion;
|
|
try
|
|
{
|
|
Strings part_names_to_delete_completely;
|
|
for (const auto & part : parts_to_delete_completely)
|
|
part_names_to_delete_completely.emplace_back(part->name);
|
|
|
|
LOG_DEBUG(log, "Removing {} old parts from ZooKeeper", parts_to_delete_completely.size());
|
|
removePartsFromZooKeeper(zookeeper, part_names_to_delete_completely, &part_names_to_retry_deletion);
|
|
}
|
|
catch (...)
|
|
{
|
|
LOG_ERROR(log, "There is a problem with deleting parts from ZooKeeper: {}", getCurrentExceptionMessage(true));
|
|
}
|
|
|
|
/// Part names that were reliably deleted from ZooKeeper should be deleted from filesystem
|
|
auto num_reliably_deleted_parts = parts_to_delete_completely.size() - part_names_to_retry_deletion.size();
|
|
LOG_DEBUG(log, "Removed {} old parts from ZooKeeper. Removing them from filesystem.", num_reliably_deleted_parts);
|
|
|
|
/// Delete normal parts on two sets
|
|
for (auto & part : parts_to_delete_completely)
|
|
{
|
|
if (part_names_to_retry_deletion.count(part->name) == 0)
|
|
parts_to_remove_from_filesystem.emplace_back(part);
|
|
else
|
|
parts_to_retry_deletion.emplace_back(part);
|
|
}
|
|
|
|
/// Will retry deletion
|
|
if (!parts_to_retry_deletion.empty())
|
|
{
|
|
rollbackDeletingParts(parts_to_retry_deletion);
|
|
LOG_DEBUG(log, "Will retry deletion of {} parts in the next time", parts_to_retry_deletion.size());
|
|
}
|
|
|
|
/// Remove parts from filesystem and finally from data_parts
|
|
if (!parts_to_remove_from_filesystem.empty())
|
|
{
|
|
clearPartsFromFilesystem(parts_to_remove_from_filesystem);
|
|
removePartsFinally(parts_to_remove_from_filesystem);
|
|
|
|
LOG_DEBUG(log, "Removed {} old parts", parts_to_remove_from_filesystem.size());
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::removePartsFromZooKeeperWithRetries(DataPartsVector & parts, size_t max_retries)
|
|
{
|
|
Strings part_names_to_remove;
|
|
for (const auto & part : parts)
|
|
part_names_to_remove.emplace_back(part->name);
|
|
|
|
return removePartsFromZooKeeperWithRetries(part_names_to_remove, max_retries);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::removePartsFromZooKeeperWithRetries(const Strings & part_names, size_t max_retries)
|
|
{
|
|
size_t num_tries = 0;
|
|
bool success = false;
|
|
|
|
while (!success && (max_retries == 0 || num_tries < max_retries))
|
|
{
|
|
try
|
|
{
|
|
++num_tries;
|
|
success = true;
|
|
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
std::vector<std::future<Coordination::ExistsResponse>> exists_futures;
|
|
exists_futures.reserve(part_names.size());
|
|
for (const String & part_name : part_names)
|
|
{
|
|
String part_path = fs::path(replica_path) / "parts" / part_name;
|
|
exists_futures.emplace_back(zookeeper->asyncExists(part_path));
|
|
}
|
|
|
|
std::vector<std::future<Coordination::MultiResponse>> remove_futures;
|
|
remove_futures.reserve(part_names.size());
|
|
for (size_t i = 0; i < part_names.size(); ++i)
|
|
{
|
|
Coordination::ExistsResponse exists_resp = exists_futures[i].get();
|
|
if (exists_resp.error == Coordination::Error::ZOK)
|
|
{
|
|
Coordination::Requests ops;
|
|
removePartFromZooKeeper(part_names[i], ops, exists_resp.stat.numChildren > 0);
|
|
remove_futures.emplace_back(zookeeper->asyncTryMultiNoThrow(ops));
|
|
}
|
|
}
|
|
|
|
for (auto & future : remove_futures)
|
|
{
|
|
auto response = future.get();
|
|
|
|
if (response.error == Coordination::Error::ZOK || response.error == Coordination::Error::ZNONODE)
|
|
continue;
|
|
|
|
if (Coordination::isHardwareError(response.error))
|
|
{
|
|
success = false;
|
|
continue;
|
|
}
|
|
|
|
throw Coordination::Exception(response.error);
|
|
}
|
|
}
|
|
catch (Coordination::Exception & e)
|
|
{
|
|
success = false;
|
|
|
|
if (Coordination::isHardwareError(e.code))
|
|
tryLogCurrentException(log, __PRETTY_FUNCTION__);
|
|
else
|
|
throw;
|
|
}
|
|
|
|
if (!success && num_tries < max_retries)
|
|
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
|
|
}
|
|
|
|
if (!success)
|
|
throw Exception(ErrorCodes::UNFINISHED, "Failed to remove parts from ZooKeeper after {} retries", num_tries);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::removePartsFromZooKeeper(
|
|
zkutil::ZooKeeperPtr & zookeeper, const Strings & part_names, NameSet * parts_should_be_retried)
|
|
{
|
|
std::vector<std::future<Coordination::ExistsResponse>> exists_futures;
|
|
std::vector<std::future<Coordination::MultiResponse>> remove_futures;
|
|
exists_futures.reserve(part_names.size());
|
|
remove_futures.reserve(part_names.size());
|
|
try
|
|
{
|
|
/// Exception can be thrown from loop
|
|
/// if zk session will be dropped
|
|
for (const String & part_name : part_names)
|
|
{
|
|
String part_path = fs::path(replica_path) / "parts" / part_name;
|
|
exists_futures.emplace_back(zookeeper->asyncExists(part_path));
|
|
}
|
|
|
|
for (size_t i = 0; i < part_names.size(); ++i)
|
|
{
|
|
Coordination::ExistsResponse exists_resp = exists_futures[i].get();
|
|
if (exists_resp.error == Coordination::Error::ZOK)
|
|
{
|
|
Coordination::Requests ops;
|
|
removePartFromZooKeeper(part_names[i], ops, exists_resp.stat.numChildren > 0);
|
|
remove_futures.emplace_back(zookeeper->asyncTryMultiNoThrow(ops));
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "There is no part {} in ZooKeeper, it was only in filesystem", part_names[i]);
|
|
// emplace invalid future so that the total number of futures is the same as part_names.size();
|
|
remove_futures.emplace_back();
|
|
}
|
|
}
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (parts_should_be_retried && Coordination::isHardwareError(e.code))
|
|
parts_should_be_retried->insert(part_names.begin(), part_names.end());
|
|
throw;
|
|
}
|
|
|
|
for (size_t i = 0; i < remove_futures.size(); ++i)
|
|
{
|
|
auto & future = remove_futures[i];
|
|
|
|
if (!future.valid())
|
|
continue;
|
|
|
|
auto response = future.get();
|
|
if (response.error == Coordination::Error::ZOK)
|
|
continue;
|
|
else if (response.error == Coordination::Error::ZNONODE)
|
|
{
|
|
LOG_DEBUG(log, "There is no part {} in ZooKeeper, it was only in filesystem", part_names[i]);
|
|
continue;
|
|
}
|
|
else if (Coordination::isHardwareError(response.error))
|
|
{
|
|
if (parts_should_be_retried)
|
|
parts_should_be_retried->insert(part_names[i]);
|
|
continue;
|
|
}
|
|
else
|
|
LOG_WARNING(log, "Cannot remove part {} from ZooKeeper: {}", part_names[i], Coordination::errorMessage(response.error));
|
|
}
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::getClearBlocksInPartitionOps(
|
|
Coordination::Requests & ops, zkutil::ZooKeeper & zookeeper, const String & partition_id, Int64 min_block_num, Int64 max_block_num)
|
|
{
|
|
Strings blocks;
|
|
if (Coordination::Error::ZOK != zookeeper.tryGetChildren(fs::path(zookeeper_path) / "blocks", blocks))
|
|
throw Exception(zookeeper_path + "/blocks doesn't exist", ErrorCodes::NOT_FOUND_NODE);
|
|
|
|
String partition_prefix = partition_id + "_";
|
|
zkutil::AsyncResponses<Coordination::GetResponse> get_futures;
|
|
|
|
for (const String & block_id : blocks)
|
|
{
|
|
if (startsWith(block_id, partition_prefix))
|
|
{
|
|
String path = fs::path(zookeeper_path) / "blocks" / block_id;
|
|
get_futures.emplace_back(path, zookeeper.asyncTryGet(path));
|
|
}
|
|
}
|
|
|
|
for (auto & pair : get_futures)
|
|
{
|
|
const String & path = pair.first;
|
|
auto result = pair.second.get();
|
|
|
|
if (result.error == Coordination::Error::ZNONODE)
|
|
continue;
|
|
|
|
ReadBufferFromString buf(result.data);
|
|
|
|
const auto part_info = MergeTreePartInfo::tryParsePartName(result.data, format_version);
|
|
|
|
if (!part_info || (min_block_num <= part_info->min_block && part_info->max_block <= max_block_num))
|
|
ops.emplace_back(zkutil::makeRemoveRequest(path, -1));
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::clearBlocksInPartition(
|
|
zkutil::ZooKeeper & zookeeper, const String & partition_id, Int64 min_block_num, Int64 max_block_num)
|
|
{
|
|
Coordination::Requests delete_requests;
|
|
getClearBlocksInPartitionOps(delete_requests, zookeeper, partition_id, min_block_num, max_block_num);
|
|
Coordination::Responses delete_responses;
|
|
auto code = zookeeper.tryMulti(delete_requests, delete_responses);
|
|
if (code != Coordination::Error::ZOK)
|
|
{
|
|
for (size_t i = 0; i < delete_requests.size(); ++i)
|
|
if (delete_responses[i]->error != Coordination::Error::ZOK)
|
|
LOG_WARNING(log, "Error while deleting ZooKeeper path `{}`: {}, ignoring.", delete_requests[i]->getPath(), Coordination::errorMessage(delete_responses[i]->error));
|
|
}
|
|
|
|
LOG_TRACE(log, "Deleted {} deduplication block IDs in partition ID {}", delete_requests.size(), partition_id);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::replacePartitionFrom(
|
|
const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr query_context)
|
|
{
|
|
/// First argument is true, because we possibly will add new data to current table.
|
|
auto lock1 = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
|
|
auto lock2 = source_table->lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
|
|
|
|
auto source_metadata_snapshot = source_table->getInMemoryMetadataPtr();
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
Stopwatch watch;
|
|
MergeTreeData & src_data = checkStructureAndGetMergeTreeData(source_table, source_metadata_snapshot, metadata_snapshot);
|
|
String partition_id = getPartitionIDFromQuery(partition, query_context);
|
|
|
|
/// NOTE: Some covered parts may be missing in src_all_parts if corresponding log entries are not executed yet.
|
|
DataPartsVector src_all_parts = src_data.getDataPartsVectorInPartition(MergeTreeDataPartState::Active, partition_id);
|
|
|
|
LOG_DEBUG(log, "Cloning {} parts", src_all_parts.size());
|
|
|
|
static const String TMP_PREFIX = "tmp_replace_from_";
|
|
auto zookeeper = getZooKeeper();
|
|
|
|
/// Retry if alter_partition_version changes
|
|
for (size_t retry = 0; retry < 1000; ++retry)
|
|
{
|
|
DataPartsVector src_parts;
|
|
MutableDataPartsVector dst_parts;
|
|
Strings block_id_paths;
|
|
Strings part_checksums;
|
|
std::vector<EphemeralLockInZooKeeper> ephemeral_locks;
|
|
String alter_partition_version_path = zookeeper_path + "/alter_partition_version";
|
|
Coordination::Stat alter_partition_version_stat;
|
|
zookeeper->get(alter_partition_version_path, &alter_partition_version_stat);
|
|
|
|
/// Firstly, generate last block number and compute drop_range
|
|
/// NOTE: Even if we make ATTACH PARTITION instead of REPLACE PARTITION drop_range will not be empty, it will contain a block.
|
|
/// So, such case has special meaning, if drop_range contains only one block it means that nothing to drop.
|
|
/// TODO why not to add normal DROP_RANGE entry to replication queue if `replace` is true?
|
|
MergeTreePartInfo drop_range;
|
|
std::optional<EphemeralLockInZooKeeper> delimiting_block_lock;
|
|
bool partition_was_empty = !getFakePartCoveringAllPartsInPartition(partition_id, drop_range, delimiting_block_lock, true);
|
|
if (replace && partition_was_empty)
|
|
{
|
|
/// Nothing to drop, will just attach new parts
|
|
LOG_INFO(log, "Partition {} was empty, REPLACE PARTITION will work as ATTACH PARTITION FROM", drop_range.partition_id);
|
|
replace = false;
|
|
}
|
|
|
|
if (!replace)
|
|
{
|
|
/// It's ATTACH PARTITION FROM, not REPLACE PARTITION. We have to reset drop range
|
|
drop_range = makeDummyDropRangeForMovePartitionOrAttachPartitionFrom(partition_id);
|
|
}
|
|
|
|
assert(replace == !LogEntry::ReplaceRangeEntry::isMovePartitionOrAttachFrom(drop_range));
|
|
|
|
String drop_range_fake_part_name = getPartNamePossiblyFake(format_version, drop_range);
|
|
|
|
for (const auto & src_part : src_all_parts)
|
|
{
|
|
/// We also make some kind of deduplication to avoid duplicated parts in case of ATTACH PARTITION
|
|
/// Assume that merges in the partition are quite rare
|
|
/// Save deduplication block ids with special prefix replace_partition
|
|
|
|
if (!canReplacePartition(src_part))
|
|
throw Exception(
|
|
"Cannot replace partition '" + partition_id + "' because part '" + src_part->name + "' has inconsistent granularity with table",
|
|
ErrorCodes::LOGICAL_ERROR);
|
|
|
|
String hash_hex = src_part->checksums.getTotalChecksumHex();
|
|
|
|
if (replace)
|
|
LOG_INFO(log, "Trying to replace {} with hash_hex {}", src_part->name, hash_hex);
|
|
else
|
|
LOG_INFO(log, "Trying to attach {} with hash_hex {}", src_part->name, hash_hex);
|
|
|
|
String block_id_path = replace ? "" : (fs::path(zookeeper_path) / "blocks" / (partition_id + "_replace_from_" + hash_hex));
|
|
|
|
auto lock = allocateBlockNumber(partition_id, zookeeper, block_id_path);
|
|
if (!lock)
|
|
{
|
|
LOG_INFO(log, "Part {} (hash {}) has been already attached", src_part->name, hash_hex);
|
|
continue;
|
|
}
|
|
|
|
UInt64 index = lock->getNumber();
|
|
MergeTreePartInfo dst_part_info(partition_id, index, index, src_part->info.level);
|
|
auto dst_part = cloneAndLoadDataPartOnSameDisk(src_part, TMP_PREFIX, dst_part_info, metadata_snapshot);
|
|
|
|
src_parts.emplace_back(src_part);
|
|
dst_parts.emplace_back(dst_part);
|
|
ephemeral_locks.emplace_back(std::move(*lock));
|
|
block_id_paths.emplace_back(block_id_path);
|
|
part_checksums.emplace_back(hash_hex);
|
|
}
|
|
|
|
ReplicatedMergeTreeLogEntryData entry;
|
|
{
|
|
auto src_table_id = src_data.getStorageID();
|
|
entry.type = ReplicatedMergeTreeLogEntryData::REPLACE_RANGE;
|
|
entry.source_replica = replica_name;
|
|
entry.create_time = time(nullptr);
|
|
entry.replace_range_entry = std::make_shared<ReplicatedMergeTreeLogEntryData::ReplaceRangeEntry>();
|
|
|
|
auto & entry_replace = *entry.replace_range_entry;
|
|
entry_replace.drop_range_part_name = drop_range_fake_part_name;
|
|
entry_replace.from_database = src_table_id.database_name;
|
|
entry_replace.from_table = src_table_id.table_name;
|
|
for (const auto & part : src_parts)
|
|
entry_replace.src_part_names.emplace_back(part->name);
|
|
for (const auto & part : dst_parts)
|
|
entry_replace.new_part_names.emplace_back(part->name);
|
|
for (const String & checksum : part_checksums)
|
|
entry_replace.part_names_checksums.emplace_back(checksum);
|
|
entry_replace.columns_version = -1;
|
|
}
|
|
|
|
/// Remove deduplication block_ids of replacing parts
|
|
if (replace)
|
|
clearBlocksInPartition(*zookeeper, drop_range.partition_id, drop_range.max_block, drop_range.max_block);
|
|
|
|
DataPartsVector parts_to_remove;
|
|
Coordination::Responses op_results;
|
|
|
|
try
|
|
{
|
|
Coordination::Requests ops;
|
|
for (size_t i = 0; i < dst_parts.size(); ++i)
|
|
{
|
|
getCommitPartOps(ops, dst_parts[i], block_id_paths[i]);
|
|
ephemeral_locks[i].getUnlockOps(ops);
|
|
}
|
|
|
|
if (auto txn = query_context->getZooKeeperMetadataTransaction())
|
|
txn->moveOpsTo(ops);
|
|
|
|
delimiting_block_lock->getUnlockOps(ops);
|
|
/// Check and update version to avoid race with DROP_RANGE
|
|
ops.emplace_back(zkutil::makeSetRequest(alter_partition_version_path, "", alter_partition_version_stat.version));
|
|
/// Just update version, because merges assignment relies on it
|
|
ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "log", "", -1));
|
|
ops.emplace_back(zkutil::makeCreateRequest(fs::path(zookeeper_path) / "log/log-", entry.toString(), zkutil::CreateMode::PersistentSequential));
|
|
|
|
Transaction transaction(*this);
|
|
{
|
|
auto data_parts_lock = lockParts();
|
|
|
|
for (MutableDataPartPtr & part : dst_parts)
|
|
renameTempPartAndReplace(part, nullptr, &transaction, data_parts_lock);
|
|
}
|
|
|
|
Coordination::Error code = zookeeper->tryMulti(ops, op_results);
|
|
if (code == Coordination::Error::ZOK)
|
|
delimiting_block_lock->assumeUnlocked();
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// Cannot retry automatically, because some zookeeper ops were lost on the first attempt. Will retry on DDLWorker-level.
|
|
if (query_context->getZooKeeperMetadataTransaction())
|
|
throw Exception(
|
|
"Cannot execute alter, because alter partition version was suddenly changed due to concurrent alter",
|
|
ErrorCodes::CANNOT_ASSIGN_ALTER);
|
|
continue;
|
|
}
|
|
else
|
|
zkutil::KeeperMultiException::check(code, ops, op_results);
|
|
|
|
{
|
|
auto data_parts_lock = lockParts();
|
|
|
|
transaction.commit(&data_parts_lock);
|
|
if (replace)
|
|
parts_to_remove = removePartsInRangeFromWorkingSet(drop_range, true, data_parts_lock);
|
|
}
|
|
|
|
PartLog::addNewParts(getContext(), dst_parts, watch.elapsed());
|
|
}
|
|
catch (...)
|
|
{
|
|
PartLog::addNewParts(getContext(), dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
|
|
throw;
|
|
}
|
|
|
|
String log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*op_results.back()).path_created;
|
|
entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
|
|
|
|
for (auto & lock : ephemeral_locks)
|
|
lock.assumeUnlocked();
|
|
|
|
/// Forcibly remove replaced parts from ZooKeeper
|
|
removePartsFromZooKeeperWithRetries(parts_to_remove);
|
|
|
|
/// Speedup removing of replaced parts from filesystem
|
|
parts_to_remove.clear();
|
|
cleanup_thread.wakeup();
|
|
|
|
lock2.reset();
|
|
lock1.reset();
|
|
|
|
waitForLogEntryToBeProcessedIfNecessary(entry, query_context);
|
|
|
|
return;
|
|
}
|
|
|
|
throw Exception(
|
|
ErrorCodes::CANNOT_ASSIGN_ALTER, "Cannot assign ALTER PARTITION, because another ALTER PARTITION query was concurrently executed");
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr query_context)
|
|
{
|
|
auto lock1 = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
|
|
auto lock2 = dest_table->lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
|
|
|
|
auto dest_table_storage = std::dynamic_pointer_cast<StorageReplicatedMergeTree>(dest_table);
|
|
if (!dest_table_storage)
|
|
throw Exception("Table " + getStorageID().getNameForLogs() + " supports movePartitionToTable only for ReplicatedMergeTree family of table engines."
|
|
" Got " + dest_table->getName(), ErrorCodes::NOT_IMPLEMENTED);
|
|
if (dest_table_storage->getStoragePolicy() != this->getStoragePolicy())
|
|
throw Exception("Destination table " + dest_table_storage->getStorageID().getNameForLogs() +
|
|
" should have the same storage policy of source table " + getStorageID().getNameForLogs() + ". " +
|
|
getStorageID().getNameForLogs() + ": " + this->getStoragePolicy()->getName() + ", " +
|
|
getStorageID().getNameForLogs() + ": " + dest_table_storage->getStoragePolicy()->getName(), ErrorCodes::UNKNOWN_POLICY);
|
|
|
|
auto dest_metadata_snapshot = dest_table->getInMemoryMetadataPtr();
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
|
|
Stopwatch watch;
|
|
MergeTreeData & src_data = dest_table_storage->checkStructureAndGetMergeTreeData(*this, metadata_snapshot, dest_metadata_snapshot);
|
|
auto src_data_id = src_data.getStorageID();
|
|
String partition_id = getPartitionIDFromQuery(partition, query_context);
|
|
|
|
/// A range for log entry to remove parts from the source table (myself).
|
|
auto zookeeper = getZooKeeper();
|
|
/// Retry if alter_partition_version changes
|
|
for (size_t retry = 0; retry < 1000; ++retry)
|
|
{
|
|
String alter_partition_version_path = zookeeper_path + "/alter_partition_version";
|
|
Coordination::Stat alter_partition_version_stat;
|
|
zookeeper->get(alter_partition_version_path, &alter_partition_version_stat);
|
|
|
|
MergeTreePartInfo drop_range;
|
|
std::optional<EphemeralLockInZooKeeper> delimiting_block_lock;
|
|
getFakePartCoveringAllPartsInPartition(partition_id, drop_range, delimiting_block_lock, true);
|
|
String drop_range_fake_part_name = getPartNamePossiblyFake(format_version, drop_range);
|
|
|
|
DataPartPtr covering_part;
|
|
DataPartsVector src_all_parts;
|
|
{
|
|
/// NOTE: Some covered parts may be missing in src_all_parts if corresponding log entries are not executed yet.
|
|
auto parts_lock = src_data.lockParts();
|
|
src_all_parts = src_data.getActivePartsToReplace(drop_range, drop_range_fake_part_name, covering_part, parts_lock);
|
|
}
|
|
|
|
if (covering_part)
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Got part {} covering drop range {}, it's a bug",
|
|
covering_part->name, drop_range_fake_part_name);
|
|
|
|
/// After allocating block number for drop_range we must ensure that it does not intersect block numbers
|
|
/// allocated by concurrent REPLACE query.
|
|
/// We could check it in multi-request atomically with creation of DROP_RANGE entry in source table log,
|
|
/// but it's better to check it here and fail as early as possible (before we have done something to destination table).
|
|
Coordination::Error version_check_code = zookeeper->trySet(alter_partition_version_path, "", alter_partition_version_stat.version);
|
|
if (version_check_code != Coordination::Error::ZOK)
|
|
throw Exception(ErrorCodes::CANNOT_ASSIGN_ALTER, "Cannot DROP PARTITION in {} after copying partition to {}, "
|
|
"because another ALTER PARTITION query was concurrently executed",
|
|
getStorageID().getFullTableName(), dest_table_storage->getStorageID().getFullTableName());
|
|
|
|
DataPartsVector src_parts;
|
|
MutableDataPartsVector dst_parts;
|
|
Strings block_id_paths;
|
|
Strings part_checksums;
|
|
std::vector<EphemeralLockInZooKeeper> ephemeral_locks;
|
|
|
|
LOG_DEBUG(log, "Cloning {} parts", src_all_parts.size());
|
|
|
|
static const String TMP_PREFIX = "tmp_move_from_";
|
|
|
|
/// Clone parts into destination table.
|
|
String dest_alter_partition_version_path = dest_table_storage->zookeeper_path + "/alter_partition_version";
|
|
Coordination::Stat dest_alter_partition_version_stat;
|
|
zookeeper->get(dest_alter_partition_version_path, &dest_alter_partition_version_stat);
|
|
for (const auto & src_part : src_all_parts)
|
|
{
|
|
if (!dest_table_storage->canReplacePartition(src_part))
|
|
throw Exception(
|
|
"Cannot move partition '" + partition_id + "' because part '" + src_part->name + "' has inconsistent granularity with table",
|
|
ErrorCodes::LOGICAL_ERROR);
|
|
|
|
String hash_hex = src_part->checksums.getTotalChecksumHex();
|
|
String block_id_path;
|
|
|
|
auto lock = dest_table_storage->allocateBlockNumber(partition_id, zookeeper, block_id_path);
|
|
if (!lock)
|
|
{
|
|
LOG_INFO(log, "Part {} (hash {}) has been already attached", src_part->name, hash_hex);
|
|
continue;
|
|
}
|
|
|
|
UInt64 index = lock->getNumber();
|
|
MergeTreePartInfo dst_part_info(partition_id, index, index, src_part->info.level);
|
|
auto dst_part = dest_table_storage->cloneAndLoadDataPartOnSameDisk(src_part, TMP_PREFIX, dst_part_info, dest_metadata_snapshot);
|
|
|
|
src_parts.emplace_back(src_part);
|
|
dst_parts.emplace_back(dst_part);
|
|
ephemeral_locks.emplace_back(std::move(*lock));
|
|
block_id_paths.emplace_back(block_id_path);
|
|
part_checksums.emplace_back(hash_hex);
|
|
}
|
|
|
|
ReplicatedMergeTreeLogEntryData entry_delete;
|
|
{
|
|
entry_delete.type = LogEntry::DROP_RANGE;
|
|
entry_delete.source_replica = replica_name;
|
|
entry_delete.new_part_name = drop_range_fake_part_name;
|
|
entry_delete.detach = false; //-V1048
|
|
entry_delete.create_time = time(nullptr);
|
|
}
|
|
|
|
ReplicatedMergeTreeLogEntryData entry;
|
|
{
|
|
MergeTreePartInfo drop_range_dest = makeDummyDropRangeForMovePartitionOrAttachPartitionFrom(partition_id);
|
|
|
|
entry.type = ReplicatedMergeTreeLogEntryData::REPLACE_RANGE;
|
|
entry.source_replica = dest_table_storage->replica_name;
|
|
entry.create_time = time(nullptr);
|
|
entry.replace_range_entry = std::make_shared<ReplicatedMergeTreeLogEntryData::ReplaceRangeEntry>();
|
|
|
|
auto & entry_replace = *entry.replace_range_entry;
|
|
entry_replace.drop_range_part_name = getPartNamePossiblyFake(format_version, drop_range_dest);
|
|
entry_replace.from_database = src_data_id.database_name;
|
|
entry_replace.from_table = src_data_id.table_name;
|
|
for (const auto & part : src_parts)
|
|
entry_replace.src_part_names.emplace_back(part->name);
|
|
for (const auto & part : dst_parts)
|
|
entry_replace.new_part_names.emplace_back(part->name);
|
|
for (const String & checksum : part_checksums)
|
|
entry_replace.part_names_checksums.emplace_back(checksum);
|
|
entry_replace.columns_version = -1;
|
|
}
|
|
|
|
clearBlocksInPartition(*zookeeper, drop_range.partition_id, drop_range.max_block, drop_range.max_block);
|
|
|
|
DataPartsVector parts_to_remove;
|
|
Coordination::Responses op_results;
|
|
|
|
try
|
|
{
|
|
Coordination::Requests ops;
|
|
for (size_t i = 0; i < dst_parts.size(); ++i)
|
|
{
|
|
dest_table_storage->getCommitPartOps(ops, dst_parts[i], block_id_paths[i]);
|
|
ephemeral_locks[i].getUnlockOps(ops);
|
|
}
|
|
|
|
/// Check and update version to avoid race with DROP_RANGE
|
|
ops.emplace_back(zkutil::makeSetRequest(dest_alter_partition_version_path, "", dest_alter_partition_version_stat.version));
|
|
/// Just update version, because merges assignment relies on it
|
|
ops.emplace_back(zkutil::makeSetRequest(fs::path(dest_table_storage->zookeeper_path) / "log", "", -1));
|
|
ops.emplace_back(zkutil::makeCreateRequest(fs::path(dest_table_storage->zookeeper_path) / "log/log-",
|
|
entry.toString(), zkutil::CreateMode::PersistentSequential));
|
|
|
|
{
|
|
Transaction transaction(*dest_table_storage);
|
|
|
|
auto src_data_parts_lock = lockParts();
|
|
auto dest_data_parts_lock = dest_table_storage->lockParts();
|
|
|
|
std::mutex mutex;
|
|
DataPartsLock lock(mutex);
|
|
|
|
for (MutableDataPartPtr & part : dst_parts)
|
|
dest_table_storage->renameTempPartAndReplace(part, nullptr, &transaction, lock);
|
|
|
|
Coordination::Error code = zookeeper->tryMulti(ops, op_results);
|
|
if (code == Coordination::Error::ZBADVERSION)
|
|
continue;
|
|
else
|
|
zkutil::KeeperMultiException::check(code, ops, op_results);
|
|
|
|
parts_to_remove = removePartsInRangeFromWorkingSet(drop_range, true, lock);
|
|
transaction.commit(&lock);
|
|
}
|
|
|
|
PartLog::addNewParts(getContext(), dst_parts, watch.elapsed());
|
|
}
|
|
catch (...)
|
|
{
|
|
PartLog::addNewParts(getContext(), dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
|
|
throw;
|
|
}
|
|
|
|
String log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*op_results.back()).path_created;
|
|
entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
|
|
|
|
for (auto & lock : ephemeral_locks)
|
|
lock.assumeUnlocked();
|
|
|
|
removePartsFromZooKeeperWithRetries(parts_to_remove);
|
|
|
|
parts_to_remove.clear();
|
|
cleanup_thread.wakeup();
|
|
lock2.reset();
|
|
|
|
dest_table_storage->waitForLogEntryToBeProcessedIfNecessary(entry, query_context);
|
|
|
|
/// Create DROP_RANGE for the source table
|
|
Coordination::Requests ops_src;
|
|
ops_src.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(zookeeper_path) / "log/log-", entry_delete.toString(), zkutil::CreateMode::PersistentSequential));
|
|
/// Just update version, because merges assignment relies on it
|
|
ops_src.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "log", "", -1));
|
|
delimiting_block_lock->getUnlockOps(ops_src);
|
|
|
|
op_results = zookeeper->multi(ops_src);
|
|
|
|
log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*op_results.front()).path_created;
|
|
entry_delete.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
|
|
|
|
lock1.reset();
|
|
waitForLogEntryToBeProcessedIfNecessary(entry_delete, query_context);
|
|
|
|
/// Cleaning possibly stored information about parts from /quorum/last_part node in ZooKeeper.
|
|
cleanLastPartNode(partition_id);
|
|
|
|
return;
|
|
}
|
|
|
|
throw Exception(ErrorCodes::CANNOT_ASSIGN_ALTER, "Cannot assign ALTER PARTITION, because another ALTER PARTITION query was concurrently executed");
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::movePartitionToShard(
|
|
const ASTPtr & partition, bool move_part, const String & to, ContextPtr /*query_context*/)
|
|
{
|
|
/// This is a lightweight operation that only optimistically checks if it could succeed and queues tasks.
|
|
|
|
if (!move_part)
|
|
throw Exception("MOVE PARTITION TO SHARD is not supported, use MOVE PART instead", ErrorCodes::NOT_IMPLEMENTED);
|
|
|
|
if (zkutil::normalizeZooKeeperPath(zookeeper_path, /* check_starts_with_slash */ true) == zkutil::normalizeZooKeeperPath(to, /* check_starts_with_slash */ true))
|
|
throw Exception("Source and destination are the same", ErrorCodes::BAD_ARGUMENTS);
|
|
|
|
auto zookeeper = getZooKeeperAndAssertNotReadonly();
|
|
|
|
String part_name = partition->as<ASTLiteral &>().value.safeGet<String>();
|
|
auto part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
|
|
|
|
auto part = getPartIfExists(part_info, {MergeTreeDataPartState::Active});
|
|
if (!part)
|
|
throw Exception(ErrorCodes::NO_SUCH_DATA_PART, "Part {} not found locally", part_name);
|
|
|
|
if (part->uuid == UUIDHelpers::Nil)
|
|
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Part {} does not have an uuid assigned and it can't be moved between shards", part_name);
|
|
|
|
|
|
ReplicatedMergeTreeMergePredicate merge_pred = queue.getMergePredicate(zookeeper);
|
|
|
|
/// The following block is pretty much copy & paste from StorageReplicatedMergeTree::dropPart to avoid conflicts while this is WIP.
|
|
/// Extract it to a common method and re-use it before merging.
|
|
{
|
|
if (partIsLastQuorumPart(part->info))
|
|
{
|
|
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Part {} is last inserted part with quorum in partition. Would not be able to drop", part_name);
|
|
}
|
|
|
|
/// canMergeSinglePart is overlapping with dropPart, let's try to use the same code.
|
|
String out_reason;
|
|
if (!merge_pred.canMergeSinglePart(part, &out_reason))
|
|
throw Exception(ErrorCodes::PART_IS_TEMPORARILY_LOCKED, "Part is busy, reason: " + out_reason);
|
|
}
|
|
|
|
{
|
|
/// Optimistic check that for compatible destination table structure.
|
|
checkTableStructure(to, getInMemoryMetadataPtr());
|
|
}
|
|
|
|
PinnedPartUUIDs src_pins;
|
|
PinnedPartUUIDs dst_pins;
|
|
|
|
{
|
|
String s = zookeeper->get(zookeeper_path + "/pinned_part_uuids", &src_pins.stat);
|
|
src_pins.fromString(s);
|
|
}
|
|
|
|
{
|
|
String s = zookeeper->get(to + "/pinned_part_uuids", &dst_pins.stat);
|
|
dst_pins.fromString(s);
|
|
}
|
|
|
|
if (src_pins.part_uuids.contains(part->uuid) || dst_pins.part_uuids.contains(part->uuid))
|
|
throw Exception(ErrorCodes::PART_IS_TEMPORARILY_LOCKED, "Part {} has it's uuid ({}) already pinned.", part_name, toString(part->uuid));
|
|
|
|
src_pins.part_uuids.insert(part->uuid);
|
|
dst_pins.part_uuids.insert(part->uuid);
|
|
|
|
PartMovesBetweenShardsOrchestrator::Entry part_move_entry;
|
|
part_move_entry.state = PartMovesBetweenShardsOrchestrator::EntryState::SYNC_SOURCE;
|
|
part_move_entry.create_time = std::time(nullptr);
|
|
part_move_entry.update_time = part_move_entry.create_time;
|
|
part_move_entry.task_uuid = UUIDHelpers::generateV4();
|
|
part_move_entry.part_name = part->name;
|
|
part_move_entry.part_uuid = part->uuid;
|
|
part_move_entry.to_shard = to;
|
|
|
|
Coordination::Requests ops;
|
|
ops.emplace_back(zkutil::makeCheckRequest(zookeeper_path + "/log", merge_pred.getVersion())); /// Make sure no new events were added to the log.
|
|
ops.emplace_back(zkutil::makeSetRequest(zookeeper_path + "/pinned_part_uuids", src_pins.toString(), src_pins.stat.version));
|
|
ops.emplace_back(zkutil::makeSetRequest(to + "/pinned_part_uuids", dst_pins.toString(), dst_pins.stat.version));
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
part_moves_between_shards_orchestrator.entries_znode_path + "/task-",
|
|
part_move_entry.toString(),
|
|
zkutil::CreateMode::PersistentSequential));
|
|
|
|
Coordination::Responses responses;
|
|
Coordination::Error rc = zookeeper->tryMulti(ops, responses);
|
|
zkutil::KeeperMultiException::check(rc, ops, responses);
|
|
|
|
String task_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*responses.back()).path_created;
|
|
LOG_DEBUG(log, "Created task for part movement between shards at {}", task_znode_path);
|
|
|
|
/// TODO(nv): Nice to have support for `replication_alter_partitions_sync`.
|
|
/// For now use the system.part_moves_between_shards table for status.
|
|
}
|
|
|
|
CancellationCode StorageReplicatedMergeTree::killPartMoveToShard(const UUID & task_uuid)
|
|
{
|
|
return part_moves_between_shards_orchestrator.killPartMoveToShard(task_uuid);
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::getCommitPartOps(
|
|
Coordination::Requests & ops,
|
|
MutableDataPartPtr & part,
|
|
const String & block_id_path) const
|
|
{
|
|
const String & part_name = part->name;
|
|
const auto storage_settings_ptr = getSettings();
|
|
|
|
if (!block_id_path.empty())
|
|
{
|
|
/// Make final duplicate check and commit block_id
|
|
ops.emplace_back(
|
|
zkutil::makeCreateRequest(
|
|
block_id_path,
|
|
part_name, /// We will be able to know original part number for duplicate blocks, if we want.
|
|
zkutil::CreateMode::Persistent));
|
|
}
|
|
|
|
/// Information about the part, in the replica
|
|
if (storage_settings_ptr->use_minimalistic_part_header_in_zookeeper)
|
|
{
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(replica_path) / "parts" / part->name,
|
|
ReplicatedMergeTreePartHeader::fromColumnsAndChecksums(part->getColumns(), part->checksums).toString(),
|
|
zkutil::CreateMode::Persistent));
|
|
}
|
|
else
|
|
{
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(replica_path) / "parts" / part->name,
|
|
"",
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(replica_path) / "parts" / part->name / "columns",
|
|
part->getColumns().toString(),
|
|
zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeCreateRequest(
|
|
fs::path(replica_path) / "parts" / part->name / "checksums",
|
|
getChecksumsForZooKeeper(part->checksums),
|
|
zkutil::CreateMode::Persistent));
|
|
}
|
|
}
|
|
|
|
ReplicatedMergeTreeAddress StorageReplicatedMergeTree::getReplicatedMergeTreeAddress() const
|
|
{
|
|
auto host_port = getContext()->getInterserverIOAddress();
|
|
auto table_id = getStorageID();
|
|
|
|
ReplicatedMergeTreeAddress res;
|
|
res.host = host_port.first;
|
|
res.replication_port = host_port.second;
|
|
res.queries_port = getContext()->getTCPPort();
|
|
res.database = table_id.database_name;
|
|
res.table = table_id.table_name;
|
|
res.scheme = getContext()->getInterserverScheme();
|
|
return res;
|
|
}
|
|
|
|
ActionLock StorageReplicatedMergeTree::getActionLock(StorageActionBlockType action_type)
|
|
{
|
|
if (action_type == ActionLocks::PartsMerge)
|
|
return merger_mutator.merges_blocker.cancel();
|
|
|
|
if (action_type == ActionLocks::PartsTTLMerge)
|
|
return merger_mutator.ttl_merges_blocker.cancel();
|
|
|
|
if (action_type == ActionLocks::PartsFetch)
|
|
return fetcher.blocker.cancel();
|
|
|
|
if (action_type == ActionLocks::PartsSend)
|
|
{
|
|
auto data_parts_exchange_ptr = std::atomic_load(&data_parts_exchange_endpoint);
|
|
return data_parts_exchange_ptr ? data_parts_exchange_ptr->blocker.cancel() : ActionLock();
|
|
}
|
|
|
|
if (action_type == ActionLocks::ReplicationQueue)
|
|
return queue.actions_blocker.cancel();
|
|
|
|
if (action_type == ActionLocks::PartsMove)
|
|
return parts_mover.moves_blocker.cancel();
|
|
|
|
return {};
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::onActionLockRemove(StorageActionBlockType action_type)
|
|
{
|
|
if (action_type == ActionLocks::PartsMerge || action_type == ActionLocks::PartsTTLMerge
|
|
|| action_type == ActionLocks::PartsFetch || action_type == ActionLocks::PartsSend
|
|
|| action_type == ActionLocks::ReplicationQueue)
|
|
background_operations_assignee.trigger();
|
|
else if (action_type == ActionLocks::PartsMove)
|
|
background_moves_assignee.trigger();
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::waitForShrinkingQueueSize(size_t queue_size, UInt64 max_wait_milliseconds)
|
|
{
|
|
Stopwatch watch;
|
|
|
|
/// Let's fetch new log entries firstly
|
|
queue.pullLogsToQueue(getZooKeeperAndAssertNotReadonly(), {}, ReplicatedMergeTreeQueue::SYNC);
|
|
|
|
/// This is significant, because the execution of this task could be delayed at BackgroundPool.
|
|
/// And we force it to be executed.
|
|
background_operations_assignee.trigger();
|
|
|
|
Poco::Event target_size_event;
|
|
auto callback = [&target_size_event, queue_size] (size_t new_queue_size)
|
|
{
|
|
if (new_queue_size <= queue_size)
|
|
target_size_event.set();
|
|
};
|
|
const auto handler = queue.addSubscriber(std::move(callback));
|
|
|
|
while (!target_size_event.tryWait(50))
|
|
{
|
|
if (max_wait_milliseconds && watch.elapsedMilliseconds() > max_wait_milliseconds)
|
|
return false;
|
|
|
|
if (partial_shutdown_called)
|
|
throw Exception("Shutdown is called for table", ErrorCodes::ABORTED);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::dropPartImpl(
|
|
zkutil::ZooKeeperPtr & zookeeper, String part_name, LogEntry & entry, bool detach, bool throw_if_noop)
|
|
{
|
|
LOG_TRACE(log, "Will try to insert a log entry to DROP_RANGE for part {}", part_name);
|
|
|
|
auto part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
|
|
|
|
while (true)
|
|
{
|
|
ReplicatedMergeTreeMergePredicate merge_pred = queue.getMergePredicate(zookeeper);
|
|
|
|
auto part = getPartIfExists(part_info, {MergeTreeDataPartState::Active});
|
|
|
|
if (!part)
|
|
{
|
|
if (throw_if_noop)
|
|
throw Exception("Part " + part_name + " not found locally, won't try to drop it.", ErrorCodes::NO_SUCH_DATA_PART);
|
|
return false;
|
|
}
|
|
|
|
if (merge_pred.hasDropRange(part->info))
|
|
{
|
|
if (throw_if_noop)
|
|
throw Exception("Already has DROP RANGE for part " + part_name + " in queue.", ErrorCodes::PART_IS_TEMPORARILY_LOCKED);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// There isn't a lot we can do otherwise. Can't cancel merges because it is possible that a replica already
|
|
/// finished the merge.
|
|
if (partIsAssignedToBackgroundOperation(part))
|
|
{
|
|
if (throw_if_noop)
|
|
throw Exception("Part " + part_name
|
|
+ " is currently participating in a background operation (mutation/merge)"
|
|
+ ", try again later", ErrorCodes::PART_IS_TEMPORARILY_LOCKED);
|
|
return false;
|
|
}
|
|
|
|
if (partIsLastQuorumPart(part->info))
|
|
{
|
|
if (throw_if_noop)
|
|
throw Exception("Part " + part_name + " is last inserted part with quorum in partition. Cannot drop",
|
|
ErrorCodes::NOT_IMPLEMENTED);
|
|
return false;
|
|
}
|
|
|
|
if (partIsInsertingWithParallelQuorum(part->info))
|
|
{
|
|
if (throw_if_noop)
|
|
throw Exception("Part " + part_name + " is inserting with parallel quorum. Cannot drop",
|
|
ErrorCodes::NOT_IMPLEMENTED);
|
|
return false;
|
|
}
|
|
|
|
Coordination::Requests ops;
|
|
getClearBlocksInPartitionOps(ops, *zookeeper, part_info.partition_id, part_info.min_block, part_info.max_block);
|
|
size_t clear_block_ops_size = ops.size();
|
|
|
|
/// If `part_name` is result of a recent merge and source parts are still available then
|
|
/// DROP_RANGE with detach will move this part together with source parts to `detached/` dir.
|
|
entry.type = LogEntry::DROP_RANGE;
|
|
entry.source_replica = replica_name;
|
|
/// We don't set fake drop level (999999999) for the single part DROP_RANGE.
|
|
/// First of all we don't guarantee anything other than the part will not be
|
|
/// active after DROP PART, but covering part (without data of dropped part) can exist.
|
|
/// If we add part with 9999999 level than we can break invariant in virtual_parts of
|
|
/// the queue.
|
|
entry.new_part_name = getPartNamePossiblyFake(format_version, part->info);
|
|
entry.detach = detach;
|
|
entry.create_time = time(nullptr);
|
|
|
|
ops.emplace_back(zkutil::makeCheckRequest(fs::path(zookeeper_path) / "log", merge_pred.getVersion())); /// Make sure no new events were added to the log.
|
|
ops.emplace_back(zkutil::makeCreateRequest(fs::path(zookeeper_path) / "log/log-", entry.toString(), zkutil::CreateMode::PersistentSequential));
|
|
/// Just update version, because merges assignment relies on it
|
|
ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "log", "", -1));
|
|
Coordination::Responses responses;
|
|
Coordination::Error rc = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (rc == Coordination::Error::ZBADVERSION)
|
|
{
|
|
LOG_TRACE(log, "A new log entry appeared while trying to commit DROP RANGE. Retry.");
|
|
continue;
|
|
}
|
|
else if (rc == Coordination::Error::ZNONODE)
|
|
{
|
|
LOG_TRACE(log, "Other replica already removing same part {} or part deduplication node was removed by background thread. Retry.", part_name);
|
|
continue;
|
|
}
|
|
else
|
|
zkutil::KeeperMultiException::check(rc, ops, responses);
|
|
|
|
String log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*responses[clear_block_ops_size + 1]).path_created;
|
|
entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::dropAllPartsInPartition(
|
|
zkutil::ZooKeeper & zookeeper, String & partition_id, LogEntry & entry, ContextPtr query_context, bool detach)
|
|
{
|
|
/// Retry if alter_partition_version changes
|
|
for (size_t retry = 0; retry < 1000; ++retry)
|
|
{
|
|
String alter_partition_version_path = zookeeper_path + "/alter_partition_version";
|
|
Coordination::Stat alter_partition_version_stat;
|
|
zookeeper.get(alter_partition_version_path, &alter_partition_version_stat);
|
|
|
|
MergeTreePartInfo drop_range_info;
|
|
|
|
/// It would prevent other replicas from assigning merges which intersect locked block number.
|
|
std::optional<EphemeralLockInZooKeeper> delimiting_block_lock;
|
|
|
|
if (!getFakePartCoveringAllPartsInPartition(partition_id, drop_range_info, delimiting_block_lock))
|
|
{
|
|
LOG_INFO(log, "Will not drop partition {}, it is empty.", partition_id);
|
|
return false;
|
|
}
|
|
|
|
clearBlocksInPartition(zookeeper, partition_id, drop_range_info.min_block, drop_range_info.max_block);
|
|
|
|
String drop_range_fake_part_name = getPartNamePossiblyFake(format_version, drop_range_info);
|
|
|
|
LOG_DEBUG(log, "Disabled merges covered by range {}", drop_range_fake_part_name);
|
|
|
|
/// Finally, having achieved the necessary invariants, you can put an entry in the log.
|
|
entry.type = LogEntry::DROP_RANGE;
|
|
entry.source_replica = replica_name;
|
|
entry.new_part_name = drop_range_fake_part_name;
|
|
entry.detach = detach;
|
|
entry.create_time = time(nullptr);
|
|
|
|
Coordination::Requests ops;
|
|
|
|
ops.emplace_back(zkutil::makeCreateRequest(fs::path(zookeeper_path) / "log/log-", entry.toString(),
|
|
zkutil::CreateMode::PersistentSequential));
|
|
|
|
/// Check and update version to avoid race with REPLACE_RANGE.
|
|
/// Otherwise new parts covered by drop_range_info may appear after execution of current DROP_RANGE entry
|
|
/// as a result of execution of concurrently created REPLACE_RANGE entry.
|
|
ops.emplace_back(zkutil::makeSetRequest(alter_partition_version_path, "", alter_partition_version_stat.version));
|
|
|
|
/// Just update version, because merges assignment relies on it
|
|
ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "log", "", -1));
|
|
delimiting_block_lock->getUnlockOps(ops);
|
|
|
|
if (auto txn = query_context->getZooKeeperMetadataTransaction())
|
|
txn->moveOpsTo(ops);
|
|
|
|
Coordination::Responses responses;
|
|
Coordination::Error code = zookeeper.tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::Error::ZOK)
|
|
delimiting_block_lock->assumeUnlocked();
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
/// Cannot retry automatically, because some zookeeper ops were lost on the first attempt. Will retry on DDLWorker-level.
|
|
if (query_context->getZooKeeperMetadataTransaction())
|
|
throw Exception(
|
|
"Cannot execute alter, because alter partition version was suddenly changed due to concurrent alter",
|
|
ErrorCodes::CANNOT_ASSIGN_ALTER);
|
|
continue;
|
|
}
|
|
else
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
|
|
String log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*responses.front()).path_created;
|
|
entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
|
|
|
|
getContext()->getMergeList().cancelInPartition(getStorageID(), partition_id, drop_range_info.max_block);
|
|
|
|
return true;
|
|
}
|
|
throw Exception(ErrorCodes::CANNOT_ASSIGN_ALTER,
|
|
"Cannot assign ALTER PARTITION because another ALTER PARTITION query was concurrently executed");
|
|
}
|
|
|
|
|
|
CheckResults StorageReplicatedMergeTree::checkData(const ASTPtr & query, ContextPtr local_context)
|
|
{
|
|
CheckResults results;
|
|
DataPartsVector data_parts;
|
|
if (const auto & check_query = query->as<ASTCheckQuery &>(); check_query.partition)
|
|
{
|
|
String partition_id = getPartitionIDFromQuery(check_query.partition, local_context);
|
|
data_parts = getDataPartsVectorInPartition(MergeTreeDataPartState::Active, partition_id);
|
|
}
|
|
else
|
|
data_parts = getDataPartsVector();
|
|
|
|
for (auto & part : data_parts)
|
|
{
|
|
try
|
|
{
|
|
results.push_back(part_check_thread.checkPart(part->name));
|
|
}
|
|
catch (const Exception & ex)
|
|
{
|
|
results.emplace_back(part->name, false, "Check of part finished with error: '" + ex.message() + "'");
|
|
}
|
|
}
|
|
return results;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::checkBrokenDisks()
|
|
{
|
|
auto disks = getStoragePolicy()->getDisks();
|
|
std::unique_ptr<DataPartsVector> parts;
|
|
|
|
for (auto disk_it = disks.rbegin(); disk_it != disks.rend(); ++disk_it)
|
|
{
|
|
auto disk_ptr = *disk_it;
|
|
if (disk_ptr->isBroken())
|
|
{
|
|
{
|
|
std::unique_lock lock(last_broken_disks_mutex);
|
|
if (!last_broken_disks.insert(disk_ptr->getName()).second)
|
|
continue;
|
|
}
|
|
|
|
LOG_INFO(log, "Scanning parts to recover on broken disk {} with path {}", disk_ptr->getName(), disk_ptr->getPath());
|
|
|
|
if (!parts)
|
|
parts = std::make_unique<DataPartsVector>(getDataPartsVector());
|
|
|
|
for (auto & part : *parts)
|
|
{
|
|
if (part->volume && part->volume->getDisk()->getName() == disk_ptr->getName())
|
|
broken_part_callback(part->name);
|
|
}
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
{
|
|
std::unique_lock lock(last_broken_disks_mutex);
|
|
if (last_broken_disks.erase(disk_ptr->getName()) > 0)
|
|
LOG_INFO(
|
|
log,
|
|
"Disk {} with path {} is recovered. Exclude it from last_broken_disks",
|
|
disk_ptr->getName(),
|
|
disk_ptr->getPath());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::canUseAdaptiveGranularity() const
|
|
{
|
|
const auto storage_settings_ptr = getSettings();
|
|
return storage_settings_ptr->index_granularity_bytes != 0 &&
|
|
(storage_settings_ptr->enable_mixed_granularity_parts ||
|
|
(!has_non_adaptive_index_granularity_parts && !other_replicas_fixed_granularity));
|
|
}
|
|
|
|
|
|
MutationCommands StorageReplicatedMergeTree::getFirstAlterMutationCommandsForPart(const DataPartPtr & part) const
|
|
{
|
|
return queue.getFirstAlterMutationCommandsForPart(part);
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::startBackgroundMovesIfNeeded()
|
|
{
|
|
if (areBackgroundMovesNeeded())
|
|
background_moves_assignee.start();
|
|
}
|
|
|
|
|
|
std::unique_ptr<MergeTreeSettings> StorageReplicatedMergeTree::getDefaultSettings() const
|
|
{
|
|
return std::make_unique<MergeTreeSettings>(getContext()->getReplicatedMergeTreeSettings());
|
|
}
|
|
|
|
|
|
String StorageReplicatedMergeTree::getTableSharedID() const
|
|
{
|
|
return toString(table_shared_id);
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::createTableSharedID()
|
|
{
|
|
if (table_shared_id != UUIDHelpers::Nil)
|
|
throw Exception(ErrorCodes::LOGICAL_ERROR, "Table shared id already initialized");
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeper();
|
|
String zookeeper_table_id_path = fs::path(zookeeper_path) / "table_shared_id";
|
|
String id;
|
|
if (!zookeeper->tryGet(zookeeper_table_id_path, id))
|
|
{
|
|
UUID table_id_candidate;
|
|
auto local_storage_id = getStorageID();
|
|
if (local_storage_id.uuid != UUIDHelpers::Nil)
|
|
table_id_candidate = local_storage_id.uuid;
|
|
else
|
|
table_id_candidate = UUIDHelpers::generateV4();
|
|
|
|
id = toString(table_id_candidate);
|
|
|
|
auto code = zookeeper->tryCreate(zookeeper_table_id_path, id, zkutil::CreateMode::Persistent);
|
|
if (code == Coordination::Error::ZNODEEXISTS)
|
|
{ /// Other replica create node early
|
|
id = zookeeper->get(zookeeper_table_id_path);
|
|
}
|
|
else if (code != Coordination::Error::ZOK)
|
|
{
|
|
throw zkutil::KeeperException(code, zookeeper_table_id_path);
|
|
}
|
|
}
|
|
|
|
table_shared_id = parseFromString<UUID>(id);
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::lockSharedDataTemporary(const String & part_name, const String & part_id, const DiskPtr & disk) const
|
|
{
|
|
if (!disk || !disk->supportZeroCopyReplication())
|
|
return;
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = tryGetZooKeeper();
|
|
if (!zookeeper)
|
|
return;
|
|
|
|
String id = part_id;
|
|
boost::replace_all(id, "/", "_");
|
|
|
|
Strings zc_zookeeper_paths = getZeroCopyPartPath(*getSettings(), disk->getType(), getTableSharedID(),
|
|
part_name, zookeeper_path);
|
|
|
|
for (const auto & zc_zookeeper_path : zc_zookeeper_paths)
|
|
{
|
|
String zookeeper_node = fs::path(zc_zookeeper_path) / id / replica_name;
|
|
|
|
LOG_TRACE(log, "Set zookeeper temporary ephemeral lock {}", zookeeper_node);
|
|
createZeroCopyLockNode(zookeeper, zookeeper_node, zkutil::CreateMode::Ephemeral, false);
|
|
}
|
|
}
|
|
|
|
void StorageReplicatedMergeTree::lockSharedData(const IMergeTreeDataPart & part, bool replace_existing_lock) const
|
|
{
|
|
if (!part.volume || !part.isStoredOnDisk())
|
|
return;
|
|
|
|
DiskPtr disk = part.volume->getDisk();
|
|
if (!disk || !disk->supportZeroCopyReplication())
|
|
return;
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = tryGetZooKeeper();
|
|
if (!zookeeper)
|
|
return;
|
|
|
|
String id = part.getUniqueId();
|
|
boost::replace_all(id, "/", "_");
|
|
|
|
Strings zc_zookeeper_paths = getZeroCopyPartPath(*getSettings(), disk->getType(), getTableSharedID(),
|
|
part.name, zookeeper_path);
|
|
for (const auto & zc_zookeeper_path : zc_zookeeper_paths)
|
|
{
|
|
String zookeeper_node = fs::path(zc_zookeeper_path) / id / replica_name;
|
|
|
|
LOG_TRACE(log, "Set zookeeper persistent lock {}", zookeeper_node);
|
|
|
|
createZeroCopyLockNode(zookeeper, zookeeper_node, zkutil::CreateMode::Persistent, replace_existing_lock);
|
|
}
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::unlockSharedData(const IMergeTreeDataPart & part) const
|
|
{
|
|
return unlockSharedData(part, part.name);
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::unlockSharedData(const IMergeTreeDataPart & part, const String & name) const
|
|
{
|
|
if (!part.volume || !part.isStoredOnDisk())
|
|
return true;
|
|
|
|
DiskPtr disk = part.volume->getDisk();
|
|
if (!disk || !disk->supportZeroCopyReplication())
|
|
return true;
|
|
|
|
/// If part is temporary refcount file may be absent
|
|
auto ref_count_path = fs::path(part.getFullRelativePath()) / IMergeTreeDataPart::FILE_FOR_REFERENCES_CHECK;
|
|
if (disk->exists(ref_count_path))
|
|
{
|
|
auto ref_count = disk->getRefCount(ref_count_path);
|
|
if (ref_count > 0) /// Keep part shard info for frozen backups
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
/// Temporary part with some absent file cannot be locked in shared mode
|
|
return true;
|
|
}
|
|
|
|
return unlockSharedDataByID(part.getUniqueId(), getTableSharedID(), name, replica_name, disk, getZooKeeper(), *getSettings(), log,
|
|
zookeeper_path);
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::unlockSharedDataByID(String part_id, const String & table_uuid, const String & part_name,
|
|
const String & replica_name_, DiskPtr disk, zkutil::ZooKeeperPtr zookeeper_ptr, const MergeTreeSettings & settings,
|
|
Poco::Logger * logger, const String & zookeeper_path_old)
|
|
{
|
|
boost::replace_all(part_id, "/", "_");
|
|
|
|
Strings zc_zookeeper_paths = getZeroCopyPartPath(settings, disk->getType(), table_uuid, part_name, zookeeper_path_old);
|
|
|
|
bool part_has_no_more_locks = true;
|
|
|
|
for (const auto & zc_zookeeper_path : zc_zookeeper_paths)
|
|
{
|
|
String zookeeper_part_uniq_node = fs::path(zc_zookeeper_path) / part_id;
|
|
|
|
/// Delete our replica node for part from zookeeper (we are not interested in it anymore)
|
|
String zookeeper_part_replica_node = fs::path(zookeeper_part_uniq_node) / replica_name_;
|
|
|
|
LOG_TRACE(logger, "Remove zookeeper lock {}", zookeeper_part_replica_node);
|
|
|
|
zookeeper_ptr->tryRemove(zookeeper_part_replica_node);
|
|
|
|
/// Check, maybe we were the last replica and can remove part forever
|
|
Strings children;
|
|
zookeeper_ptr->tryGetChildren(zookeeper_part_uniq_node, children);
|
|
|
|
if (!children.empty())
|
|
{
|
|
LOG_TRACE(logger, "Found zookeper locks for {}", zookeeper_part_uniq_node);
|
|
part_has_no_more_locks = false;
|
|
continue;
|
|
}
|
|
|
|
auto error_code = zookeeper_ptr->tryRemove(zookeeper_part_uniq_node);
|
|
|
|
LOG_TRACE(logger, "Remove parent zookeeper lock {} : {}", zookeeper_part_uniq_node, error_code != Coordination::Error::ZNOTEMPTY);
|
|
|
|
/// Even when we have lock with same part name, but with different uniq, we can remove files on S3
|
|
children.clear();
|
|
String zookeeper_part_node = fs::path(zookeeper_part_uniq_node).parent_path();
|
|
zookeeper_ptr->tryGetChildren(zookeeper_part_node, children);
|
|
if (children.empty())
|
|
{
|
|
/// Cleanup after last uniq removing
|
|
error_code = zookeeper_ptr->tryRemove(zookeeper_part_node);
|
|
|
|
LOG_TRACE(logger, "Remove parent zookeeper lock {} : {}", zookeeper_part_node, error_code != Coordination::Error::ZNOTEMPTY);
|
|
}
|
|
else
|
|
{
|
|
LOG_TRACE(logger, "Can't remove parent zookeeper lock {} : {}", zookeeper_part_node, children.size());
|
|
for (auto & c : children)
|
|
{
|
|
LOG_TRACE(logger, "Child node {}", c);
|
|
}
|
|
}
|
|
}
|
|
|
|
return part_has_no_more_locks;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::tryToFetchIfShared(
|
|
const IMergeTreeDataPart & part,
|
|
const DiskPtr & disk,
|
|
const String & path)
|
|
{
|
|
const auto settings = getSettings();
|
|
auto disk_type = disk->getType();
|
|
if (!(disk->supportZeroCopyReplication() && settings->allow_remote_fs_zero_copy_replication))
|
|
return false;
|
|
|
|
String replica = getSharedDataReplica(part, disk_type);
|
|
|
|
/// We can't fetch part when none replicas have this part on a same type remote disk
|
|
if (replica.empty())
|
|
return false;
|
|
|
|
return executeFetchShared(replica, part.name, disk, path);
|
|
}
|
|
|
|
|
|
String StorageReplicatedMergeTree::getSharedDataReplica(
|
|
const IMergeTreeDataPart & part, DiskType disk_type) const
|
|
{
|
|
String best_replica;
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = tryGetZooKeeper();
|
|
if (!zookeeper)
|
|
return "";
|
|
|
|
Strings zc_zookeeper_paths = getZeroCopyPartPath(*getSettings(), disk_type, getTableSharedID(), part.name,
|
|
zookeeper_path);
|
|
|
|
std::set<String> replicas;
|
|
|
|
for (const auto & zc_zookeeper_path : zc_zookeeper_paths)
|
|
{
|
|
Strings ids;
|
|
zookeeper->tryGetChildren(zc_zookeeper_path, ids);
|
|
|
|
for (const auto & id : ids)
|
|
{
|
|
String zookeeper_part_uniq_node = fs::path(zc_zookeeper_path) / id;
|
|
Strings id_replicas;
|
|
zookeeper->tryGetChildren(zookeeper_part_uniq_node, id_replicas);
|
|
LOG_TRACE(log, "Found zookeper replicas for {}: {}", zookeeper_part_uniq_node, id_replicas.size());
|
|
replicas.insert(id_replicas.begin(), id_replicas.end());
|
|
}
|
|
}
|
|
|
|
LOG_TRACE(log, "Found zookeper replicas for part {}: {}", part.name, replicas.size());
|
|
|
|
Strings active_replicas;
|
|
|
|
/// TODO: Move best replica choose in common method (here is the same code as in StorageReplicatedMergeTree::fetchPartition)
|
|
|
|
/// Leave only active replicas.
|
|
active_replicas.reserve(replicas.size());
|
|
|
|
for (const String & replica : replicas)
|
|
if ((replica != replica_name) && (zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active")))
|
|
active_replicas.push_back(replica);
|
|
|
|
LOG_TRACE(log, "Found zookeper active replicas for part {}: {}", part.name, active_replicas.size());
|
|
|
|
if (active_replicas.empty())
|
|
return "";
|
|
|
|
/** You must select the best (most relevant) replica.
|
|
* This is a replica with the maximum `log_pointer`, then with the minimum `queue` size.
|
|
* NOTE This is not exactly the best criteria. It does not make sense to download old partitions,
|
|
* and it would be nice to be able to choose the replica closest by network.
|
|
* NOTE Of course, there are data races here. You can solve it by retrying.
|
|
*/
|
|
Int64 max_log_pointer = -1;
|
|
UInt64 min_queue_size = std::numeric_limits<UInt64>::max();
|
|
|
|
for (const String & replica : active_replicas)
|
|
{
|
|
String current_replica_path = fs::path(zookeeper_path) / "replicas" / replica;
|
|
|
|
String log_pointer_str = zookeeper->get(fs::path(current_replica_path) / "log_pointer");
|
|
Int64 log_pointer = log_pointer_str.empty() ? 0 : parse<UInt64>(log_pointer_str);
|
|
|
|
Coordination::Stat stat;
|
|
zookeeper->get(fs::path(current_replica_path) / "queue", &stat);
|
|
size_t queue_size = stat.numChildren;
|
|
|
|
if (log_pointer > max_log_pointer
|
|
|| (log_pointer == max_log_pointer && queue_size < min_queue_size))
|
|
{
|
|
max_log_pointer = log_pointer;
|
|
min_queue_size = queue_size;
|
|
best_replica = replica;
|
|
}
|
|
}
|
|
|
|
return best_replica;
|
|
}
|
|
|
|
|
|
Strings StorageReplicatedMergeTree::getZeroCopyPartPath(const MergeTreeSettings & settings, DiskType disk_type, const String & table_uuid,
|
|
const String & part_name, const String & zookeeper_path_old)
|
|
{
|
|
Strings res;
|
|
|
|
String zero_copy = fmt::format("zero_copy_{}", toString(disk_type));
|
|
|
|
String new_path = fs::path(settings.remote_fs_zero_copy_zookeeper_path.toString()) / zero_copy / table_uuid / part_name;
|
|
res.push_back(new_path);
|
|
if (settings.remote_fs_zero_copy_path_compatible_mode && !zookeeper_path_old.empty())
|
|
{ /// Compatibility mode for cluster with old and new versions
|
|
String old_path = fs::path(zookeeper_path_old) / zero_copy / "shared" / part_name;
|
|
res.push_back(old_path);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::checkZeroCopyLockExists(const String & part_name, const DiskPtr & disk)
|
|
{
|
|
auto path = getZeroCopyPartPath(part_name, disk);
|
|
if (path)
|
|
{
|
|
/// FIXME
|
|
auto lock_path = fs::path(*path) / "part_exclusive_lock";
|
|
if (getZooKeeper()->exists(lock_path))
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
std::optional<String> StorageReplicatedMergeTree::getZeroCopyPartPath(const String & part_name, const DiskPtr & disk)
|
|
{
|
|
if (!disk || !disk->supportZeroCopyReplication())
|
|
return std::nullopt;
|
|
|
|
return getZeroCopyPartPath(*getSettings(), disk->getType(), getTableSharedID(), part_name, zookeeper_path)[0];
|
|
}
|
|
|
|
std::optional<ZeroCopyLock> StorageReplicatedMergeTree::tryCreateZeroCopyExclusiveLock(const String & part_name, const DiskPtr & disk)
|
|
{
|
|
if (!disk || !disk->supportZeroCopyReplication())
|
|
return std::nullopt;
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = tryGetZooKeeper();
|
|
if (!zookeeper)
|
|
return std::nullopt;
|
|
|
|
String zc_zookeeper_path = *getZeroCopyPartPath(part_name, disk);
|
|
|
|
/// Just recursively create ancestors for lock
|
|
zookeeper->createAncestors(zc_zookeeper_path);
|
|
zookeeper->createIfNotExists(zc_zookeeper_path, "");
|
|
|
|
/// Create actual lock
|
|
ZeroCopyLock lock(zookeeper, zc_zookeeper_path);
|
|
if (lock.lock->tryLock())
|
|
return lock;
|
|
else
|
|
return std::nullopt;
|
|
}
|
|
|
|
String StorageReplicatedMergeTree::findReplicaHavingPart(
|
|
const String & part_name, const String & zookeeper_path_, zkutil::ZooKeeper::Ptr zookeeper_ptr)
|
|
{
|
|
Strings replicas = zookeeper_ptr->getChildren(fs::path(zookeeper_path_) / "replicas");
|
|
|
|
/// Select replicas in uniformly random order.
|
|
std::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
|
|
|
|
for (const String & replica : replicas)
|
|
{
|
|
if (zookeeper_ptr->exists(fs::path(zookeeper_path_) / "replicas" / replica / "parts" / part_name)
|
|
&& zookeeper_ptr->exists(fs::path(zookeeper_path_) / "replicas" / replica / "is_active"))
|
|
return fs::path(zookeeper_path_) / "replicas" / replica;
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::checkIfDetachedPartExists(const String & part_name)
|
|
{
|
|
fs::directory_iterator dir_end;
|
|
for (const std::string & path : getDataPaths())
|
|
for (fs::directory_iterator dir_it{fs::path(path) / "detached/"}; dir_it != dir_end; ++dir_it)
|
|
if (dir_it->path().filename().string() == part_name)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::checkIfDetachedPartitionExists(const String & partition_name)
|
|
{
|
|
fs::directory_iterator dir_end;
|
|
|
|
for (const std::string & path : getDataPaths())
|
|
{
|
|
for (fs::directory_iterator dir_it{fs::path(path) / "detached/"}; dir_it != dir_end; ++dir_it)
|
|
{
|
|
const String file_name = dir_it->path().filename().string();
|
|
auto part_info = MergeTreePartInfo::tryParsePartName(file_name, format_version);
|
|
|
|
if (part_info && part_info->partition_id == partition_name)
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::createEmptyPartInsteadOfLost(zkutil::ZooKeeperPtr zookeeper, const String & lost_part_name)
|
|
{
|
|
LOG_INFO(log, "Going to replace lost part {} with empty part", lost_part_name);
|
|
auto metadata_snapshot = getInMemoryMetadataPtr();
|
|
auto settings = getSettings();
|
|
|
|
constexpr static auto TMP_PREFIX = "tmp_empty_";
|
|
|
|
auto new_part_info = MergeTreePartInfo::fromPartName(lost_part_name, format_version);
|
|
auto block = metadata_snapshot->getSampleBlock();
|
|
|
|
DB::IMergeTreeDataPart::TTLInfos move_ttl_infos;
|
|
|
|
NamesAndTypesList columns = metadata_snapshot->getColumns().getAllPhysical().filter(block.getNames());
|
|
ReservationPtr reservation = reserveSpacePreferringTTLRules(metadata_snapshot, 0, move_ttl_infos, time(nullptr), 0, true);
|
|
VolumePtr volume = getStoragePolicy()->getVolume(0);
|
|
|
|
auto minmax_idx = std::make_shared<IMergeTreeDataPart::MinMaxIndex>();
|
|
minmax_idx->update(block, getMinMaxColumnsNames(metadata_snapshot->getPartitionKey()));
|
|
|
|
auto new_data_part = createPart(
|
|
lost_part_name,
|
|
choosePartType(0, block.rows()),
|
|
new_part_info,
|
|
createVolumeFromReservation(reservation, volume),
|
|
TMP_PREFIX + lost_part_name);
|
|
|
|
if (settings->assign_part_uuids)
|
|
new_data_part->uuid = UUIDHelpers::generateV4();
|
|
|
|
new_data_part->setColumns(columns);
|
|
new_data_part->rows_count = block.rows();
|
|
|
|
{
|
|
auto lock = lockParts();
|
|
auto parts_in_partition = getDataPartsPartitionRange(new_part_info.partition_id);
|
|
if (!parts_in_partition.empty())
|
|
{
|
|
new_data_part->partition = (*parts_in_partition.begin())->partition;
|
|
}
|
|
else if (auto parsed_partition = MergeTreePartition::tryParseValueFromID(
|
|
new_part_info.partition_id,
|
|
metadata_snapshot->getPartitionKey().sample_block))
|
|
{
|
|
new_data_part->partition = MergeTreePartition(*parsed_partition);
|
|
}
|
|
else
|
|
{
|
|
LOG_WARNING(log, "Empty part {} is not created instead of lost part because there are no parts in partition {} (it's empty), "
|
|
"resolve this manually using DROP/DETACH PARTITION.", lost_part_name, new_part_info.partition_id);
|
|
return false;
|
|
}
|
|
|
|
}
|
|
|
|
new_data_part->minmax_idx = std::move(minmax_idx);
|
|
new_data_part->is_temp = true;
|
|
|
|
SyncGuardPtr sync_guard;
|
|
if (new_data_part->isStoredOnDisk())
|
|
{
|
|
/// The name could be non-unique in case of stale files from previous runs.
|
|
String full_path = new_data_part->getFullRelativePath();
|
|
|
|
if (new_data_part->volume->getDisk()->exists(full_path))
|
|
{
|
|
LOG_WARNING(log, "Removing old temporary directory {}", fullPath(new_data_part->volume->getDisk(), full_path));
|
|
new_data_part->volume->getDisk()->removeRecursive(full_path);
|
|
}
|
|
|
|
const auto disk = new_data_part->volume->getDisk();
|
|
disk->createDirectories(full_path);
|
|
|
|
if (getSettings()->fsync_part_directory)
|
|
sync_guard = disk->getDirectorySyncGuard(full_path);
|
|
}
|
|
|
|
/// This effectively chooses minimal compression method:
|
|
/// either default lz4 or compression method with zero thresholds on absolute and relative part size.
|
|
auto compression_codec = getContext()->chooseCompressionCodec(0, 0);
|
|
|
|
const auto & index_factory = MergeTreeIndexFactory::instance();
|
|
MergedBlockOutputStream out(new_data_part, metadata_snapshot, columns,
|
|
index_factory.getMany(metadata_snapshot->getSecondaryIndices()), compression_codec);
|
|
|
|
bool sync_on_insert = settings->fsync_after_insert;
|
|
|
|
out.write(block);
|
|
/// TODO(ab): What projections should we add to the empty part? How can we make sure that it
|
|
/// won't block future merges? Perhaps we should also check part emptiness when selecting parts
|
|
/// to merge.
|
|
out.finalizePart(new_data_part, sync_on_insert);
|
|
|
|
try
|
|
{
|
|
MergeTreeData::Transaction transaction(*this);
|
|
auto replaced_parts = renameTempPartAndReplace(new_data_part, nullptr, &transaction);
|
|
|
|
if (!replaced_parts.empty())
|
|
{
|
|
Strings part_names;
|
|
for (const auto & part : replaced_parts)
|
|
part_names.emplace_back(part->name);
|
|
|
|
/// Why this exception is not a LOGICAL_ERROR? Because it's possible
|
|
/// to have some source parts for the lost part if replica currently
|
|
/// cloning from another replica, but source replica lost covering
|
|
/// part and finished MERGE_PARTS before clone. It's an extremely
|
|
/// rare case and it's unclear how to resolve it better. Eventually
|
|
/// source replica will replace lost part with empty part and we
|
|
/// will fetch this empty part instead of our source parts. This
|
|
/// will make replicas consistent, but some data will be lost.
|
|
throw Exception(ErrorCodes::INCORRECT_DATA, "Tried to create empty part {}, but it replaces existing parts {}.", lost_part_name, fmt::join(part_names, ", "));
|
|
}
|
|
|
|
while (true)
|
|
{
|
|
|
|
Coordination::Requests ops;
|
|
Coordination::Stat replicas_stat;
|
|
auto replicas_path = fs::path(zookeeper_path) / "replicas";
|
|
Strings replicas = zookeeper->getChildren(replicas_path, &replicas_stat);
|
|
|
|
/// In rare cases new replica can appear during check
|
|
ops.emplace_back(zkutil::makeCheckRequest(replicas_path, replicas_stat.version));
|
|
|
|
for (const String & replica : replicas)
|
|
{
|
|
String current_part_path = fs::path(zookeeper_path) / "replicas" / replica / "parts" / lost_part_name;
|
|
|
|
/// We must be sure that this part doesn't exist on other replicas
|
|
if (!zookeeper->exists(current_part_path))
|
|
{
|
|
ops.emplace_back(zkutil::makeCreateRequest(current_part_path, "", zkutil::CreateMode::Persistent));
|
|
ops.emplace_back(zkutil::makeRemoveRequest(current_part_path, -1));
|
|
}
|
|
else
|
|
{
|
|
throw Exception(ErrorCodes::DUPLICATE_DATA_PART, "Part {} already exists on replica {} on path {}", lost_part_name, replica, current_part_path);
|
|
}
|
|
}
|
|
|
|
getCommitPartOps(ops, new_data_part);
|
|
|
|
Coordination::Responses responses;
|
|
if (auto code = zookeeper->tryMulti(ops, responses); code == Coordination::Error::ZOK)
|
|
{
|
|
transaction.commit();
|
|
break;
|
|
}
|
|
else if (code == Coordination::Error::ZBADVERSION)
|
|
{
|
|
LOG_INFO(log, "Looks like new replica appearead while creating new empty part, will retry");
|
|
}
|
|
else
|
|
{
|
|
zkutil::KeeperMultiException::check(code, ops, responses);
|
|
}
|
|
}
|
|
}
|
|
catch (const Exception & ex)
|
|
{
|
|
LOG_WARNING(log, "Cannot commit empty part {} with error {}", lost_part_name, ex.displayText());
|
|
return false;
|
|
}
|
|
|
|
LOG_INFO(log, "Created empty part {} instead of lost part", lost_part_name);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::createZeroCopyLockNode(const zkutil::ZooKeeperPtr & zookeeper, const String & zookeeper_node, int32_t mode, bool replace_existing_lock)
|
|
{
|
|
/// In rare case other replica can remove path between createAncestors and createIfNotExists
|
|
/// So we make up to 5 attempts
|
|
|
|
for (int attempts = 5; attempts > 0; --attempts)
|
|
{
|
|
try
|
|
{
|
|
/// Ephemeral locks can be created only when we fetch shared data.
|
|
/// So it never require to create ancestors. If we create them
|
|
/// race condition with source replica drop is possible.
|
|
if (mode == zkutil::CreateMode::Persistent)
|
|
zookeeper->createAncestors(zookeeper_node);
|
|
|
|
if (replace_existing_lock && zookeeper->exists(zookeeper_node))
|
|
{
|
|
Coordination::Requests ops;
|
|
ops.emplace_back(zkutil::makeRemoveRequest(zookeeper_node, -1));
|
|
ops.emplace_back(zkutil::makeCreateRequest(zookeeper_node, "", mode));
|
|
Coordination::Responses responses;
|
|
auto error = zookeeper->tryMulti(ops, responses);
|
|
if (error == Coordination::Error::ZOK)
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
auto error = zookeeper->tryCreate(zookeeper_node, "", mode);
|
|
if (error == Coordination::Error::ZOK || error == Coordination::Error::ZNODEEXISTS)
|
|
break;
|
|
}
|
|
}
|
|
catch (const zkutil::KeeperException & e)
|
|
{
|
|
if (e.code == Coordination::Error::ZNONODE)
|
|
continue;
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
namespace
|
|
{
|
|
|
|
/// Special metadata used during freeze table. Required for zero-copy
|
|
/// replication.
|
|
struct FreezeMetaData
|
|
{
|
|
public:
|
|
void fill(const StorageReplicatedMergeTree & storage)
|
|
{
|
|
is_replicated = storage.supportsReplication();
|
|
is_remote = storage.isRemote();
|
|
replica_name = storage.getReplicaName();
|
|
zookeeper_name = storage.getZooKeeperName();
|
|
table_shared_id = storage.getTableSharedID();
|
|
}
|
|
|
|
void save(DiskPtr data_disk, const String & path) const
|
|
{
|
|
auto metadata_disk = data_disk->getMetadataDiskIfExistsOrSelf();
|
|
|
|
auto file_path = getFileName(path);
|
|
auto buffer = metadata_disk->writeFile(file_path, DBMS_DEFAULT_BUFFER_SIZE, WriteMode::Rewrite);
|
|
writeIntText(version, *buffer);
|
|
buffer->write("\n", 1);
|
|
writeBoolText(is_replicated, *buffer);
|
|
buffer->write("\n", 1);
|
|
writeBoolText(is_remote, *buffer);
|
|
buffer->write("\n", 1);
|
|
writeString(replica_name, *buffer);
|
|
buffer->write("\n", 1);
|
|
writeString(zookeeper_name, *buffer);
|
|
buffer->write("\n", 1);
|
|
writeString(table_shared_id, *buffer);
|
|
buffer->write("\n", 1);
|
|
}
|
|
|
|
bool load(DiskPtr data_disk, const String & path)
|
|
{
|
|
auto metadata_disk = data_disk->getMetadataDiskIfExistsOrSelf();
|
|
auto file_path = getFileName(path);
|
|
|
|
if (!metadata_disk->exists(file_path))
|
|
return false;
|
|
auto buffer = metadata_disk->readFile(file_path, ReadSettings(), {});
|
|
readIntText(version, *buffer);
|
|
if (version != 1)
|
|
{
|
|
LOG_ERROR(&Poco::Logger::get("FreezeMetaData"), "Unknown freezed metadata version: {}", version);
|
|
return false;
|
|
}
|
|
DB::assertChar('\n', *buffer);
|
|
readBoolText(is_replicated, *buffer);
|
|
DB::assertChar('\n', *buffer);
|
|
readBoolText(is_remote, *buffer);
|
|
DB::assertChar('\n', *buffer);
|
|
readString(replica_name, *buffer);
|
|
DB::assertChar('\n', *buffer);
|
|
readString(zookeeper_name, *buffer);
|
|
DB::assertChar('\n', *buffer);
|
|
readString(table_shared_id, *buffer);
|
|
DB::assertChar('\n', *buffer);
|
|
return true;
|
|
}
|
|
|
|
static void clean(DiskPtr data_disk, const String & path)
|
|
{
|
|
auto metadata_disk = data_disk->getMetadataDiskIfExistsOrSelf();
|
|
metadata_disk->removeFileIfExists(getFileName(path));
|
|
}
|
|
|
|
private:
|
|
static String getFileName(const String & path)
|
|
{
|
|
return fs::path(path) / "frozen_metadata.txt";
|
|
}
|
|
|
|
public:
|
|
int version = 1;
|
|
bool is_replicated;
|
|
bool is_remote;
|
|
String replica_name;
|
|
String zookeeper_name;
|
|
String table_shared_id;
|
|
};
|
|
|
|
}
|
|
|
|
bool StorageReplicatedMergeTree::removeDetachedPart(DiskPtr disk, const String & path, const String & part_name, bool is_freezed)
|
|
{
|
|
if (disk->supportZeroCopyReplication())
|
|
{
|
|
if (is_freezed)
|
|
{
|
|
FreezeMetaData meta;
|
|
if (meta.load(disk, path))
|
|
{
|
|
FreezeMetaData::clean(disk, path);
|
|
return removeSharedDetachedPart(disk, path, part_name, meta.table_shared_id, meta.zookeeper_name, meta.replica_name, "");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
String table_id = getTableSharedID();
|
|
|
|
return removeSharedDetachedPart(disk, path, part_name, table_id, zookeeper_name, replica_name, zookeeper_path);
|
|
}
|
|
}
|
|
|
|
disk->removeRecursive(path);
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
bool StorageReplicatedMergeTree::removeSharedDetachedPart(DiskPtr disk, const String & path, const String & part_name, const String & table_uuid,
|
|
const String &, const String & detached_replica_name, const String & detached_zookeeper_path)
|
|
{
|
|
bool keep_shared = false;
|
|
|
|
zkutil::ZooKeeperPtr zookeeper = getZooKeeper();
|
|
|
|
fs::path checksums = fs::path(path) / IMergeTreeDataPart::FILE_FOR_REFERENCES_CHECK;
|
|
if (disk->exists(checksums))
|
|
{
|
|
if (disk->getRefCount(checksums) == 0)
|
|
{
|
|
String id = disk->getUniqueId(checksums);
|
|
keep_shared = !StorageReplicatedMergeTree::unlockSharedDataByID(id, table_uuid, part_name,
|
|
detached_replica_name, disk, zookeeper, getContext()->getReplicatedMergeTreeSettings(), log,
|
|
detached_zookeeper_path);
|
|
}
|
|
else
|
|
keep_shared = true;
|
|
}
|
|
|
|
disk->removeSharedRecursive(path, keep_shared);
|
|
|
|
return keep_shared;
|
|
}
|
|
|
|
|
|
void StorageReplicatedMergeTree::createAndStoreFreezeMetadata(DiskPtr disk, DataPartPtr, String backup_part_path) const
|
|
{
|
|
if (disk->supportZeroCopyReplication())
|
|
{
|
|
FreezeMetaData meta;
|
|
meta.fill(*this);
|
|
meta.save(disk, backup_part_path);
|
|
}
|
|
}
|
|
|
|
|
|
}
|