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264cff6415
TODO (suggested by Nikolai) 1. Build query plan fro current query (inside storage::read) up to WithMergableState 2. Check, that plan is simple enough: Aggregating - Expression - Filter - ReadFromStorage (or simplier) 3. Check, that filter is the same as filter in projection, and also expression calculates the same aggregation keys as in projection 4. Return WithMergableState if projection applies 3 will be easier to do with ActionsDAG, cause it sees all functions, and dependencies are direct (but it is possible with ExpressionActions also) Also need to figure out how prewhere works for projections, and row_filter_policies. wip
1982 lines
82 KiB
C++
1982 lines
82 KiB
C++
#include "ClusterCopier.h"
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#include "Internals.h"
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#include <Common/ZooKeeper/ZooKeeper.h>
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#include <Common/ZooKeeper/KeeperException.h>
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#include <Common/setThreadName.h>
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#include <IO/ConnectionTimeoutsContext.h>
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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 NOT_IMPLEMENTED;
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extern const int LOGICAL_ERROR;
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extern const int UNFINISHED;
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extern const int BAD_ARGUMENTS;
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}
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void ClusterCopier::init()
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{
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auto zookeeper = getContext()->getZooKeeper();
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task_description_watch_callback = [this] (const Coordination::WatchResponse & response)
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{
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if (response.error != Coordination::Error::ZOK)
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return;
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UInt64 version = ++task_description_version;
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LOG_DEBUG(log, "Task description should be updated, local version {}", version);
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};
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task_description_path = task_zookeeper_path + "/description";
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task_cluster = std::make_unique<TaskCluster>(task_zookeeper_path, working_database_name);
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reloadTaskDescription();
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task_cluster_initial_config = task_cluster_current_config;
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task_cluster->loadTasks(*task_cluster_initial_config);
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getContext()->setClustersConfig(task_cluster_initial_config, task_cluster->clusters_prefix);
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/// Set up shards and their priority
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task_cluster->random_engine.seed(task_cluster->random_device());
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for (auto & task_table : task_cluster->table_tasks)
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{
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task_table.cluster_pull = getContext()->getCluster(task_table.cluster_pull_name);
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task_table.cluster_push = getContext()->getCluster(task_table.cluster_push_name);
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task_table.initShards(task_cluster->random_engine);
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}
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LOG_DEBUG(log, "Will process {} table tasks", task_cluster->table_tasks.size());
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/// Do not initialize tables, will make deferred initialization in process()
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zookeeper->createAncestors(getWorkersPathVersion() + "/");
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zookeeper->createAncestors(getWorkersPath() + "/");
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}
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template <typename T>
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decltype(auto) ClusterCopier::retry(T && func, UInt64 max_tries)
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{
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std::exception_ptr exception;
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if (max_tries == 0)
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throw Exception("Cannot perform zero retries", ErrorCodes::LOGICAL_ERROR);
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for (UInt64 try_number = 1; try_number <= max_tries; ++try_number)
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{
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try
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{
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return func();
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}
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catch (...)
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{
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exception = std::current_exception();
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if (try_number < max_tries)
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{
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tryLogCurrentException(log, "Will retry");
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std::this_thread::sleep_for(default_sleep_time);
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}
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}
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}
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std::rethrow_exception(exception);
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}
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void ClusterCopier::discoverShardPartitions(const ConnectionTimeouts & timeouts, const TaskShardPtr & task_shard)
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{
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TaskTable & task_table = task_shard->task_table;
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LOG_INFO(log, "Discover partitions of shard {}", task_shard->getDescription());
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auto get_partitions = [&] () { return getShardPartitions(timeouts, *task_shard); };
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auto existing_partitions_names = retry(get_partitions, 60);
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Strings filtered_partitions_names;
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Strings missing_partitions;
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/// Check that user specified correct partition names
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auto check_partition_format = [] (const DataTypePtr & type, const String & partition_text_quoted)
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{
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MutableColumnPtr column_dummy = type->createColumn();
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ReadBufferFromString rb(partition_text_quoted);
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try
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{
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type->getDefaultSerialization()->deserializeTextQuoted(*column_dummy, rb, FormatSettings());
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}
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catch (Exception & e)
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{
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throw Exception("Partition " + partition_text_quoted + " has incorrect format. " + e.displayText(), ErrorCodes::BAD_ARGUMENTS);
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}
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};
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if (task_table.has_enabled_partitions)
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{
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/// Process partition in order specified by <enabled_partitions/>
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for (const String & partition_name : task_table.enabled_partitions)
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{
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/// Check that user specified correct partition names
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check_partition_format(task_shard->partition_key_column.type, partition_name);
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auto it = existing_partitions_names.find(partition_name);
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/// Do not process partition if it is not in enabled_partitions list
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if (it == existing_partitions_names.end())
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{
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missing_partitions.emplace_back(partition_name);
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continue;
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}
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filtered_partitions_names.emplace_back(*it);
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}
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for (const String & partition_name : existing_partitions_names)
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{
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if (!task_table.enabled_partitions_set.count(partition_name))
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{
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LOG_DEBUG(log, "Partition {} will not be processed, since it is not in enabled_partitions of {}", partition_name, task_table.table_id);
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}
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}
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}
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else
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{
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for (const String & partition_name : existing_partitions_names)
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filtered_partitions_names.emplace_back(partition_name);
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}
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for (const String & partition_name : filtered_partitions_names)
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{
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const size_t number_of_splits = task_table.number_of_splits;
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task_shard->partition_tasks.emplace(partition_name, ShardPartition(*task_shard, partition_name, number_of_splits));
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task_shard->checked_partitions.emplace(partition_name, true);
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auto shard_partition_it = task_shard->partition_tasks.find(partition_name);
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PartitionPieces & shard_partition_pieces = shard_partition_it->second.pieces;
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for (size_t piece_number = 0; piece_number < number_of_splits; ++piece_number)
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{
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bool res = checkPresentPartitionPiecesOnCurrentShard(timeouts, *task_shard, partition_name, piece_number);
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shard_partition_pieces.emplace_back(shard_partition_it->second, piece_number, res);
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}
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}
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if (!missing_partitions.empty())
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{
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WriteBufferFromOwnString ss;
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for (const String & missing_partition : missing_partitions)
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ss << " " << missing_partition;
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LOG_WARNING(log, "There are no {} partitions from enabled_partitions in shard {} :{}", missing_partitions.size(), task_shard->getDescription(), ss.str());
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}
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LOG_DEBUG(log, "Will copy {} partitions from shard {}", task_shard->partition_tasks.size(), task_shard->getDescription());
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}
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void ClusterCopier::discoverTablePartitions(const ConnectionTimeouts & timeouts, TaskTable & task_table, UInt64 num_threads)
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{
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/// Fetch partitions list from a shard
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{
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ThreadPool thread_pool(num_threads ? num_threads : 2 * getNumberOfPhysicalCPUCores());
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for (const TaskShardPtr & task_shard : task_table.all_shards)
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thread_pool.scheduleOrThrowOnError([this, timeouts, task_shard]()
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{
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setThreadName("DiscoverPartns");
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discoverShardPartitions(timeouts, task_shard);
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});
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LOG_DEBUG(log, "Waiting for {} setup jobs", thread_pool.active());
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thread_pool.wait();
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}
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}
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void ClusterCopier::uploadTaskDescription(const std::string & task_path, const std::string & task_file, const bool force)
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{
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auto local_task_description_path = task_path + "/description";
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String task_config_str;
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{
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ReadBufferFromFile in(task_file);
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readStringUntilEOF(task_config_str, in);
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}
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if (task_config_str.empty())
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return;
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auto zookeeper = getContext()->getZooKeeper();
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zookeeper->createAncestors(local_task_description_path);
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auto code = zookeeper->tryCreate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
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if (code != Coordination::Error::ZOK && force)
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zookeeper->createOrUpdate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
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LOG_DEBUG(log, "Task description {} uploaded to {} with result {} ({})",
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((code != Coordination::Error::ZOK && !force) ? "not " : ""), local_task_description_path, code, Coordination::errorMessage(code));
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}
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void ClusterCopier::reloadTaskDescription()
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{
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auto zookeeper = getContext()->getZooKeeper();
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task_description_watch_zookeeper = zookeeper;
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String task_config_str;
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Coordination::Stat stat{};
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Coordination::Error code;
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zookeeper->tryGetWatch(task_description_path, task_config_str, &stat, task_description_watch_callback, &code);
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if (code != Coordination::Error::ZOK)
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throw Exception("Can't get description node " + task_description_path, ErrorCodes::BAD_ARGUMENTS);
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LOG_DEBUG(log, "Loading description, zxid={}", task_description_current_stat.czxid);
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auto config = getConfigurationFromXMLString(task_config_str);
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/// Setup settings
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task_cluster->reloadSettings(*config);
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getContext()->setSettings(task_cluster->settings_common);
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task_cluster_current_config = config;
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task_description_current_stat = stat;
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}
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void ClusterCopier::updateConfigIfNeeded()
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{
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UInt64 version_to_update = task_description_version;
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bool is_outdated_version = task_description_current_version != version_to_update;
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bool is_expired_session = !task_description_watch_zookeeper || task_description_watch_zookeeper->expired();
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if (!is_outdated_version && !is_expired_session)
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return;
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LOG_DEBUG(log, "Updating task description");
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reloadTaskDescription();
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task_description_current_version = version_to_update;
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}
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void ClusterCopier::process(const ConnectionTimeouts & timeouts)
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{
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for (TaskTable & task_table : task_cluster->table_tasks)
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{
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LOG_INFO(log, "Process table task {} with {} shards, {} of them are local ones", task_table.table_id, task_table.all_shards.size(), task_table.local_shards.size());
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if (task_table.all_shards.empty())
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continue;
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/// Discover partitions of each shard and total set of partitions
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if (!task_table.has_enabled_partitions)
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{
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/// If there are no specified enabled_partitions, we must discover them manually
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discoverTablePartitions(timeouts, task_table);
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/// After partitions of each shard are initialized, initialize cluster partitions
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for (const TaskShardPtr & task_shard : task_table.all_shards)
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{
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for (const auto & partition_elem : task_shard->partition_tasks)
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{
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const String & partition_name = partition_elem.first;
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task_table.cluster_partitions.emplace(partition_name, ClusterPartition{});
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}
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}
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for (auto & partition_elem : task_table.cluster_partitions)
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{
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const String & partition_name = partition_elem.first;
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for (const TaskShardPtr & task_shard : task_table.all_shards)
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task_shard->checked_partitions.emplace(partition_name);
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task_table.ordered_partition_names.emplace_back(partition_name);
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}
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}
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else
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{
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/// If enabled_partitions are specified, assume that each shard has all partitions
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/// We will refine partition set of each shard in future
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for (const String & partition_name : task_table.enabled_partitions)
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{
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task_table.cluster_partitions.emplace(partition_name, ClusterPartition{});
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task_table.ordered_partition_names.emplace_back(partition_name);
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}
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}
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task_table.watch.restart();
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/// Retry table processing
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bool table_is_done = false;
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for (UInt64 num_table_tries = 0; num_table_tries < max_table_tries; ++num_table_tries)
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{
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if (tryProcessTable(timeouts, task_table))
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{
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table_is_done = true;
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break;
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}
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}
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if (!table_is_done)
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{
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throw Exception("Too many tries to process table " + task_table.table_id + ". Abort remaining execution",
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ErrorCodes::UNFINISHED);
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}
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}
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}
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/// Protected section
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/*
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* Creates task worker node and checks maximum number of workers not to exceed the limit.
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* To achieve this we have to check version of workers_version_path node and create current_worker_path
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* node atomically.
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* */
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zkutil::EphemeralNodeHolder::Ptr ClusterCopier::createTaskWorkerNodeAndWaitIfNeed(
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const zkutil::ZooKeeperPtr & zookeeper,
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const String & description,
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bool unprioritized)
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{
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std::chrono::milliseconds current_sleep_time = default_sleep_time;
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static constexpr std::chrono::milliseconds max_sleep_time(30000); // 30 sec
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if (unprioritized)
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std::this_thread::sleep_for(current_sleep_time);
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String workers_version_path = getWorkersPathVersion();
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String workers_path = getWorkersPath();
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String current_worker_path = getCurrentWorkerNodePath();
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UInt64 num_bad_version_errors = 0;
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while (true)
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{
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updateConfigIfNeeded();
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Coordination::Stat stat;
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zookeeper->get(workers_version_path, &stat);
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auto version = stat.version;
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zookeeper->get(workers_path, &stat);
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if (static_cast<UInt64>(stat.numChildren) >= task_cluster->max_workers)
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{
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LOG_DEBUG(log, "Too many workers ({}, maximum {}). Postpone processing {}", stat.numChildren, task_cluster->max_workers, description);
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if (unprioritized)
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current_sleep_time = std::min(max_sleep_time, current_sleep_time + default_sleep_time);
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std::this_thread::sleep_for(current_sleep_time);
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num_bad_version_errors = 0;
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}
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else
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{
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Coordination::Requests ops;
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ops.emplace_back(zkutil::makeSetRequest(workers_version_path, description, version));
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ops.emplace_back(zkutil::makeCreateRequest(current_worker_path, description, zkutil::CreateMode::Ephemeral));
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Coordination::Responses responses;
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auto code = zookeeper->tryMulti(ops, responses);
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if (code == Coordination::Error::ZOK || code == Coordination::Error::ZNODEEXISTS)
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return std::make_shared<zkutil::EphemeralNodeHolder>(current_worker_path, *zookeeper, false, false, description);
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if (code == Coordination::Error::ZBADVERSION)
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{
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++num_bad_version_errors;
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/// Try to make fast retries
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if (num_bad_version_errors > 3)
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{
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LOG_DEBUG(log, "A concurrent worker has just been added, will check free worker slots again");
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std::chrono::milliseconds random_sleep_time(std::uniform_int_distribution<int>(1, 1000)(task_cluster->random_engine));
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std::this_thread::sleep_for(random_sleep_time);
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num_bad_version_errors = 0;
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}
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}
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else
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throw Coordination::Exception(code);
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}
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}
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}
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bool ClusterCopier::checkPartitionPieceIsClean(
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const zkutil::ZooKeeperPtr & zookeeper,
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const CleanStateClock & clean_state_clock,
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const String & task_status_path)
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{
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LogicalClock task_start_clock;
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Coordination::Stat stat{};
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if (zookeeper->exists(task_status_path, &stat))
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task_start_clock = LogicalClock(stat.mzxid);
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return clean_state_clock.is_clean() && (!task_start_clock.hasHappened() || clean_state_clock.discovery_zxid <= task_start_clock);
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}
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bool ClusterCopier::checkAllPiecesInPartitionAreDone(const TaskTable & task_table, const String & partition_name, const TasksShard & shards_with_partition)
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{
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bool answer = true;
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for (size_t piece_number = 0; piece_number < task_table.number_of_splits; ++piece_number)
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{
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bool piece_is_done = checkPartitionPieceIsDone(task_table, partition_name, piece_number, shards_with_partition);
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if (!piece_is_done)
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LOG_DEBUG(log, "Partition {} piece {} is not already done.", partition_name, piece_number);
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answer &= piece_is_done;
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}
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return answer;
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}
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/* The same as function above
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* Assume that we don't know on which shards do we have partition certain piece.
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* We'll check them all (I mean shards that contain the whole partition)
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* And shards that don't have certain piece MUST mark that piece is_done true.
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* */
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bool ClusterCopier::checkPartitionPieceIsDone(const TaskTable & task_table, const String & partition_name,
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size_t piece_number, const TasksShard & shards_with_partition)
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{
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LOG_DEBUG(log, "Check that all shards processed partition {} piece {} successfully", partition_name, piece_number);
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auto zookeeper = getContext()->getZooKeeper();
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/// Collect all shards that contain partition piece number piece_number.
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Strings piece_status_paths;
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for (const auto & shard : shards_with_partition)
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{
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ShardPartition & task_shard_partition = shard->partition_tasks.find(partition_name)->second;
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ShardPartitionPiece & shard_partition_piece = task_shard_partition.pieces[piece_number];
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piece_status_paths.emplace_back(shard_partition_piece.getShardStatusPath());
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}
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std::vector<int64_t> zxid1, zxid2;
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try
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{
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std::vector<zkutil::ZooKeeper::FutureGet> get_futures;
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for (const String & path : piece_status_paths)
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get_futures.emplace_back(zookeeper->asyncGet(path));
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// Check that state is Finished and remember zxid
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for (auto & future : get_futures)
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{
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auto res = future.get();
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TaskStateWithOwner status = TaskStateWithOwner::fromString(res.data);
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if (status.state != TaskState::Finished)
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{
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LOG_INFO(log, "The task {} is being rewritten by {}. Partition piece will be rechecked", res.data, status.owner);
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return false;
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}
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zxid1.push_back(res.stat.pzxid);
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}
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const String piece_is_dirty_flag_path = task_table.getCertainPartitionPieceIsDirtyPath(partition_name, piece_number);
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const String piece_is_dirty_cleaned_path = task_table.getCertainPartitionPieceIsCleanedPath(partition_name, piece_number);
|
|
const String piece_task_status_path = task_table.getCertainPartitionPieceTaskStatusPath(partition_name, piece_number);
|
|
|
|
CleanStateClock clean_state_clock (zookeeper, piece_is_dirty_flag_path, piece_is_dirty_cleaned_path);
|
|
|
|
const bool is_clean = checkPartitionPieceIsClean(zookeeper, clean_state_clock, piece_task_status_path);
|
|
|
|
|
|
if (!is_clean)
|
|
{
|
|
LOG_INFO(log, "Partition {} become dirty", partition_name);
|
|
return false;
|
|
}
|
|
|
|
get_futures.clear();
|
|
for (const String & path : piece_status_paths)
|
|
get_futures.emplace_back(zookeeper->asyncGet(path));
|
|
|
|
// Remember zxid of states again
|
|
for (auto & future : get_futures)
|
|
{
|
|
auto res = future.get();
|
|
zxid2.push_back(res.stat.pzxid);
|
|
}
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
LOG_INFO(log, "A ZooKeeper error occurred while checking partition {} piece number {}. Will recheck the partition. Error: {}", partition_name, toString(piece_number), e.displayText());
|
|
return false;
|
|
}
|
|
|
|
// If all task is finished and zxid is not changed then partition could not become dirty again
|
|
for (UInt64 shard_num = 0; shard_num < piece_status_paths.size(); ++shard_num)
|
|
{
|
|
if (zxid1[shard_num] != zxid2[shard_num])
|
|
{
|
|
LOG_INFO(log, "The task {} is being modified now. Partition piece will be rechecked", piece_status_paths[shard_num]);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
LOG_INFO(log, "Partition {} piece number {} is copied successfully", partition_name, toString(piece_number));
|
|
return true;
|
|
}
|
|
|
|
|
|
TaskStatus ClusterCopier::tryMoveAllPiecesToDestinationTable(const TaskTable & task_table, const String & partition_name)
|
|
{
|
|
bool inject_fault = false;
|
|
if (move_fault_probability > 0)
|
|
{
|
|
double value = std::uniform_real_distribution<>(0, 1)(task_table.task_cluster.random_engine);
|
|
inject_fault = value < move_fault_probability;
|
|
}
|
|
|
|
LOG_DEBUG(log, "Try to move {} to destination table", partition_name);
|
|
|
|
auto zookeeper = getContext()->getZooKeeper();
|
|
|
|
const auto current_partition_attach_is_active = task_table.getPartitionAttachIsActivePath(partition_name);
|
|
const auto current_partition_attach_is_done = task_table.getPartitionAttachIsDonePath(partition_name);
|
|
|
|
/// Create ephemeral node to mark that we are active and process the partition
|
|
zookeeper->createAncestors(current_partition_attach_is_active);
|
|
zkutil::EphemeralNodeHolderPtr partition_attach_node_holder;
|
|
try
|
|
{
|
|
partition_attach_node_holder = zkutil::EphemeralNodeHolder::create(current_partition_attach_is_active, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Someone is already moving pieces {}", current_partition_attach_is_active);
|
|
return TaskStatus::Active;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
|
|
/// Exit if task has been already processed;
|
|
/// create blocking node to signal cleaning up if it is abandoned
|
|
{
|
|
String status_data;
|
|
if (zookeeper->tryGet(current_partition_attach_is_done, status_data))
|
|
{
|
|
TaskStateWithOwner status = TaskStateWithOwner::fromString(status_data);
|
|
if (status.state == TaskState::Finished)
|
|
{
|
|
LOG_DEBUG(log, "All pieces for partition from this task {} has been successfully moved to destination table by {}", current_partition_attach_is_active, status.owner);
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
/// Task is abandoned, because previously we created ephemeral node, possibly in other copier's process.
|
|
/// Initialize DROP PARTITION
|
|
LOG_DEBUG(log, "Moving piece for partition {} has not been successfully finished by {}. Will try to move by myself.", current_partition_attach_is_active, status.owner);
|
|
|
|
/// Remove is_done marker.
|
|
zookeeper->remove(current_partition_attach_is_done);
|
|
}
|
|
}
|
|
|
|
|
|
/// Try start processing, create node about it
|
|
{
|
|
String start_state = TaskStateWithOwner::getData(TaskState::Started, host_id);
|
|
zookeeper->create(current_partition_attach_is_done, start_state, zkutil::CreateMode::Persistent);
|
|
}
|
|
|
|
/// Move partition to original destination table.
|
|
for (size_t current_piece_number = 0; current_piece_number < task_table.number_of_splits; ++current_piece_number)
|
|
{
|
|
LOG_DEBUG(log, "Trying to move partition {} piece {} to original table", partition_name, toString(current_piece_number));
|
|
|
|
ASTPtr query_alter_ast;
|
|
String query_alter_ast_string;
|
|
|
|
DatabaseAndTableName original_table = task_table.table_push;
|
|
DatabaseAndTableName helping_table = DatabaseAndTableName(original_table.first,
|
|
original_table.second + "_piece_" +
|
|
toString(current_piece_number));
|
|
|
|
Settings settings_push = task_cluster->settings_push;
|
|
ClusterExecutionMode execution_mode = ClusterExecutionMode::ON_EACH_NODE;
|
|
UInt64 max_successful_executions_per_shard = 0;
|
|
if (settings_push.replication_alter_partitions_sync == 1)
|
|
{
|
|
execution_mode = ClusterExecutionMode::ON_EACH_SHARD;
|
|
max_successful_executions_per_shard = 1;
|
|
}
|
|
|
|
query_alter_ast_string += " ALTER TABLE " + getQuotedTable(original_table) +
|
|
((partition_name == "'all'") ? " ATTACH PARTITION ID " : " ATTACH PARTITION ") + partition_name +
|
|
" FROM " + getQuotedTable(helping_table);
|
|
|
|
LOG_DEBUG(log, "Executing ALTER query: {}", query_alter_ast_string);
|
|
|
|
try
|
|
{
|
|
/// Try attach partition on each shard
|
|
UInt64 num_nodes = executeQueryOnCluster(
|
|
task_table.cluster_push,
|
|
query_alter_ast_string,
|
|
task_cluster->settings_push,
|
|
PoolMode::GET_MANY,
|
|
execution_mode,
|
|
max_successful_executions_per_shard);
|
|
|
|
if (settings_push.replication_alter_partitions_sync == 1)
|
|
{
|
|
LOG_INFO(
|
|
log,
|
|
"Destination tables {} have been executed alter query successfully on {} shards of {}",
|
|
getQuotedTable(task_table.table_push),
|
|
num_nodes,
|
|
task_table.cluster_push->getShardCount());
|
|
|
|
if (num_nodes != task_table.cluster_push->getShardCount())
|
|
{
|
|
return TaskStatus::Error;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LOG_INFO(log, "Number of nodes that executed ALTER query successfully : {}", toString(num_nodes));
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
LOG_DEBUG(log, "Error while moving partition {} piece {} to original table", partition_name, toString(current_piece_number));
|
|
throw;
|
|
}
|
|
|
|
if (inject_fault)
|
|
throw Exception("Copy fault injection is activated", ErrorCodes::UNFINISHED);
|
|
|
|
try
|
|
{
|
|
String query_deduplicate_ast_string;
|
|
if (!task_table.isReplicatedTable())
|
|
{
|
|
query_deduplicate_ast_string += " OPTIMIZE TABLE " + getQuotedTable(original_table) +
|
|
((partition_name == "'all'") ? " PARTITION ID " : " PARTITION ") + partition_name + " DEDUPLICATE;";
|
|
|
|
LOG_DEBUG(log, "Executing OPTIMIZE DEDUPLICATE query: {}", query_deduplicate_ast_string);
|
|
|
|
UInt64 num_nodes = executeQueryOnCluster(
|
|
task_table.cluster_push,
|
|
query_deduplicate_ast_string,
|
|
task_cluster->settings_push,
|
|
PoolMode::GET_MANY);
|
|
|
|
LOG_INFO(log, "Number of shard that executed OPTIMIZE DEDUPLICATE query successfully : {}", toString(num_nodes));
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
LOG_DEBUG(log, "Error while executing OPTIMIZE DEDUPLICATE partition {}in the original table", partition_name);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
/// Create node to signal that we finished moving
|
|
{
|
|
String state_finished = TaskStateWithOwner::getData(TaskState::Finished, host_id);
|
|
zookeeper->set(current_partition_attach_is_done, state_finished, 0);
|
|
}
|
|
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
/// Removes MATERIALIZED and ALIAS columns from create table query
|
|
ASTPtr ClusterCopier::removeAliasColumnsFromCreateQuery(const ASTPtr & query_ast)
|
|
{
|
|
const ASTs & column_asts = query_ast->as<ASTCreateQuery &>().columns_list->columns->children;
|
|
auto new_columns = std::make_shared<ASTExpressionList>();
|
|
|
|
for (const ASTPtr & column_ast : column_asts)
|
|
{
|
|
const auto & column = column_ast->as<ASTColumnDeclaration &>();
|
|
|
|
if (!column.default_specifier.empty())
|
|
{
|
|
ColumnDefaultKind kind = columnDefaultKindFromString(column.default_specifier);
|
|
if (kind == ColumnDefaultKind::Materialized || kind == ColumnDefaultKind::Alias)
|
|
continue;
|
|
}
|
|
|
|
new_columns->children.emplace_back(column_ast->clone());
|
|
}
|
|
|
|
ASTPtr new_query_ast = query_ast->clone();
|
|
auto & new_query = new_query_ast->as<ASTCreateQuery &>();
|
|
|
|
auto new_columns_list = std::make_shared<ASTColumns>();
|
|
new_columns_list->set(new_columns_list->columns, new_columns);
|
|
if (const auto * indices = query_ast->as<ASTCreateQuery>()->columns_list->indices)
|
|
new_columns_list->set(new_columns_list->indices, indices->clone());
|
|
if (const auto * projections = query_ast->as<ASTCreateQuery>()->columns_list->projections)
|
|
new_columns_list->set(new_columns_list->projections, projections->clone());
|
|
|
|
new_query.replace(new_query.columns_list, new_columns_list);
|
|
|
|
return new_query_ast;
|
|
}
|
|
|
|
/// Replaces ENGINE and table name in a create query
|
|
std::shared_ptr<ASTCreateQuery> rewriteCreateQueryStorage(const ASTPtr & create_query_ast,
|
|
const DatabaseAndTableName & new_table,
|
|
const ASTPtr & new_storage_ast)
|
|
{
|
|
const auto & create = create_query_ast->as<ASTCreateQuery &>();
|
|
auto res = std::make_shared<ASTCreateQuery>(create);
|
|
|
|
if (create.storage == nullptr || new_storage_ast == nullptr)
|
|
throw Exception("Storage is not specified", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
res->database = new_table.first;
|
|
res->table = new_table.second;
|
|
|
|
res->children.clear();
|
|
res->set(res->columns_list, create.columns_list->clone());
|
|
res->set(res->storage, new_storage_ast->clone());
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
bool ClusterCopier::tryDropPartitionPiece(
|
|
ShardPartition & task_partition,
|
|
const size_t current_piece_number,
|
|
const zkutil::ZooKeeperPtr & zookeeper,
|
|
const CleanStateClock & clean_state_clock)
|
|
{
|
|
if (is_safe_mode)
|
|
throw Exception("DROP PARTITION is prohibited in safe mode", ErrorCodes::NOT_IMPLEMENTED);
|
|
|
|
TaskTable & task_table = task_partition.task_shard.task_table;
|
|
ShardPartitionPiece & partition_piece = task_partition.pieces[current_piece_number];
|
|
|
|
const String current_shards_path = partition_piece.getPartitionPieceShardsPath();
|
|
const String current_partition_active_workers_dir = partition_piece.getPartitionPieceActiveWorkersPath();
|
|
const String is_dirty_flag_path = partition_piece.getPartitionPieceIsDirtyPath();
|
|
const String dirty_cleaner_path = partition_piece.getPartitionPieceCleanerPath();
|
|
const String is_dirty_cleaned_path = partition_piece.getPartitionPieceIsCleanedPath();
|
|
|
|
zkutil::EphemeralNodeHolder::Ptr cleaner_holder;
|
|
try
|
|
{
|
|
cleaner_holder = zkutil::EphemeralNodeHolder::create(dirty_cleaner_path, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Partition {} piece {} is cleaning now by somebody, sleep", task_partition.name, toString(current_piece_number));
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
return false;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
Coordination::Stat stat{};
|
|
if (zookeeper->exists(current_partition_active_workers_dir, &stat))
|
|
{
|
|
if (stat.numChildren != 0)
|
|
{
|
|
LOG_DEBUG(log, "Partition {} contains {} active workers while trying to drop it. Going to sleep.", task_partition.name, stat.numChildren);
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
zookeeper->remove(current_partition_active_workers_dir);
|
|
}
|
|
}
|
|
|
|
{
|
|
zkutil::EphemeralNodeHolder::Ptr active_workers_lock;
|
|
try
|
|
{
|
|
active_workers_lock = zkutil::EphemeralNodeHolder::create(current_partition_active_workers_dir, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Partition {} is being filled now by somebody, sleep", task_partition.name);
|
|
return false;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
// Lock the dirty flag
|
|
zookeeper->set(is_dirty_flag_path, host_id, clean_state_clock.discovery_version.value());
|
|
zookeeper->tryRemove(partition_piece.getPartitionPieceCleanStartPath());
|
|
CleanStateClock my_clock(zookeeper, is_dirty_flag_path, is_dirty_cleaned_path);
|
|
|
|
/// Remove all status nodes
|
|
{
|
|
Strings children;
|
|
if (zookeeper->tryGetChildren(current_shards_path, children) == Coordination::Error::ZOK)
|
|
for (const auto & child : children)
|
|
{
|
|
zookeeper->removeRecursive(current_shards_path + "/" + child);
|
|
}
|
|
}
|
|
|
|
|
|
DatabaseAndTableName original_table = task_table.table_push;
|
|
DatabaseAndTableName helping_table = DatabaseAndTableName(original_table.first, original_table.second + "_piece_" + toString(current_piece_number));
|
|
|
|
String query = "ALTER TABLE " + getQuotedTable(helping_table);
|
|
query += ((task_partition.name == "'all'") ? " DROP PARTITION ID " : " DROP PARTITION ") + task_partition.name + "";
|
|
|
|
/// TODO: use this statement after servers will be updated up to 1.1.54310
|
|
// query += " DROP PARTITION ID '" + task_partition.name + "'";
|
|
|
|
ClusterPtr & cluster_push = task_table.cluster_push;
|
|
Settings settings_push = task_cluster->settings_push;
|
|
|
|
/// It is important, DROP PARTITION must be done synchronously
|
|
settings_push.replication_alter_partitions_sync = 2;
|
|
|
|
LOG_DEBUG(log, "Execute distributed DROP PARTITION: {}", query);
|
|
/// We have to drop partition_piece on each replica
|
|
size_t num_shards = executeQueryOnCluster(
|
|
cluster_push, query,
|
|
settings_push,
|
|
PoolMode::GET_MANY,
|
|
ClusterExecutionMode::ON_EACH_NODE);
|
|
|
|
LOG_INFO(log, "DROP PARTITION was successfully executed on {} nodes of a cluster.", num_shards);
|
|
|
|
/// Update the locking node
|
|
if (!my_clock.is_stale())
|
|
{
|
|
zookeeper->set(is_dirty_flag_path, host_id, my_clock.discovery_version.value());
|
|
if (my_clock.clean_state_version)
|
|
zookeeper->set(is_dirty_cleaned_path, host_id, my_clock.clean_state_version.value());
|
|
else
|
|
zookeeper->create(is_dirty_cleaned_path, host_id, zkutil::CreateMode::Persistent);
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Clean state is altered when dropping the partition, cowardly bailing");
|
|
/// clean state is stale
|
|
return false;
|
|
}
|
|
|
|
LOG_INFO(log, "Partition {} piece {} was dropped on cluster {}", task_partition.name, toString(current_piece_number), task_table.cluster_push_name);
|
|
if (zookeeper->tryCreate(current_shards_path, host_id, zkutil::CreateMode::Persistent) == Coordination::Error::ZNODEEXISTS)
|
|
zookeeper->set(current_shards_path, host_id);
|
|
}
|
|
|
|
LOG_INFO(log, "Partition {} piece {} is safe for work now.", task_partition.name, toString(current_piece_number));
|
|
return true;
|
|
}
|
|
|
|
bool ClusterCopier::tryProcessTable(const ConnectionTimeouts & timeouts, TaskTable & task_table)
|
|
{
|
|
/// Create destination table
|
|
TaskStatus task_status = TaskStatus::Error;
|
|
|
|
task_status = tryCreateDestinationTable(timeouts, task_table);
|
|
/// Exit if success
|
|
if (task_status != TaskStatus::Finished)
|
|
{
|
|
LOG_WARNING(log, "Create destination Tale Failed ");
|
|
return false;
|
|
}
|
|
/// An heuristic: if previous shard is already done, then check next one without sleeps due to max_workers constraint
|
|
bool previous_shard_is_instantly_finished = false;
|
|
|
|
/// Process each partition that is present in cluster
|
|
for (const String & partition_name : task_table.ordered_partition_names)
|
|
{
|
|
if (!task_table.cluster_partitions.count(partition_name))
|
|
throw Exception("There are no expected partition " + partition_name + ". It is a bug", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
ClusterPartition & cluster_partition = task_table.cluster_partitions[partition_name];
|
|
|
|
Stopwatch watch;
|
|
/// We will check all the shards of the table and check if they contain current partition.
|
|
TasksShard expected_shards;
|
|
UInt64 num_failed_shards = 0;
|
|
|
|
++cluster_partition.total_tries;
|
|
|
|
LOG_DEBUG(log, "Processing partition {} for the whole cluster", partition_name);
|
|
|
|
/// Process each source shard having current partition and copy current partition
|
|
/// NOTE: shards are sorted by "distance" to current host
|
|
bool has_shard_to_process = false;
|
|
for (const TaskShardPtr & shard : task_table.all_shards)
|
|
{
|
|
/// Does shard have a node with current partition?
|
|
if (shard->partition_tasks.count(partition_name) == 0)
|
|
{
|
|
/// If not, did we check existence of that partition previously?
|
|
if (shard->checked_partitions.count(partition_name) == 0)
|
|
{
|
|
auto check_shard_has_partition = [&] () { return checkShardHasPartition(timeouts, *shard, partition_name); };
|
|
bool has_partition = retry(check_shard_has_partition);
|
|
|
|
shard->checked_partitions.emplace(partition_name);
|
|
|
|
if (has_partition)
|
|
{
|
|
const size_t number_of_splits = task_table.number_of_splits;
|
|
shard->partition_tasks.emplace(partition_name, ShardPartition(*shard, partition_name, number_of_splits));
|
|
LOG_DEBUG(log, "Discovered partition {} in shard {}", partition_name, shard->getDescription());
|
|
/// To save references in the future.
|
|
auto shard_partition_it = shard->partition_tasks.find(partition_name);
|
|
PartitionPieces & shard_partition_pieces = shard_partition_it->second.pieces;
|
|
|
|
for (size_t piece_number = 0; piece_number < number_of_splits; ++piece_number)
|
|
{
|
|
auto res = checkPresentPartitionPiecesOnCurrentShard(timeouts, *shard, partition_name, piece_number);
|
|
shard_partition_pieces.emplace_back(shard_partition_it->second, piece_number, res);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Found that shard {} does not contain current partition {}", shard->getDescription(), partition_name);
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/// We have already checked that partition, but did not discover it
|
|
previous_shard_is_instantly_finished = true;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
auto it_shard_partition = shard->partition_tasks.find(partition_name);
|
|
/// Previously when we discovered that shard does not contain current partition, we skipped it.
|
|
/// At this moment partition have to be present.
|
|
if (it_shard_partition == shard->partition_tasks.end())
|
|
throw Exception("There are no such partition in a shard. This is a bug.", ErrorCodes::LOGICAL_ERROR);
|
|
auto & partition = it_shard_partition->second;
|
|
|
|
expected_shards.emplace_back(shard);
|
|
|
|
/// Do not sleep if there is a sequence of already processed shards to increase startup
|
|
bool is_unprioritized_task = !previous_shard_is_instantly_finished && shard->priority.is_remote;
|
|
task_status = TaskStatus::Error;
|
|
bool was_error = false;
|
|
has_shard_to_process = true;
|
|
for (UInt64 try_num = 0; try_num < max_shard_partition_tries; ++try_num)
|
|
{
|
|
task_status = tryProcessPartitionTask(timeouts, partition, is_unprioritized_task);
|
|
|
|
/// Exit if success
|
|
if (task_status == TaskStatus::Finished)
|
|
break;
|
|
|
|
was_error = true;
|
|
|
|
/// Skip if the task is being processed by someone
|
|
if (task_status == TaskStatus::Active)
|
|
break;
|
|
|
|
/// Repeat on errors
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
}
|
|
|
|
if (task_status == TaskStatus::Error)
|
|
++num_failed_shards;
|
|
|
|
previous_shard_is_instantly_finished = !was_error;
|
|
}
|
|
|
|
cluster_partition.elapsed_time_seconds += watch.elapsedSeconds();
|
|
|
|
/// Check that whole cluster partition is done
|
|
/// Firstly check the number of failed partition tasks, then look into ZooKeeper and ensure that each partition is done
|
|
bool partition_copying_is_done = num_failed_shards == 0;
|
|
try
|
|
{
|
|
partition_copying_is_done =
|
|
!has_shard_to_process
|
|
|| (partition_copying_is_done && checkAllPiecesInPartitionAreDone(task_table, partition_name, expected_shards));
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log);
|
|
partition_copying_is_done = false;
|
|
}
|
|
|
|
|
|
bool partition_moving_is_done = false;
|
|
/// Try to move only if all pieces were copied.
|
|
if (partition_copying_is_done)
|
|
{
|
|
for (UInt64 try_num = 0; try_num < max_shard_partition_piece_tries_for_alter; ++try_num)
|
|
{
|
|
try
|
|
{
|
|
auto res = tryMoveAllPiecesToDestinationTable(task_table, partition_name);
|
|
/// Exit and mark current task is done.
|
|
if (res == TaskStatus::Finished)
|
|
{
|
|
partition_moving_is_done = true;
|
|
break;
|
|
}
|
|
|
|
/// Exit if this task is active.
|
|
if (res == TaskStatus::Active)
|
|
break;
|
|
|
|
/// Repeat on errors.
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "Some error occurred while moving pieces to destination table for partition " + partition_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (partition_copying_is_done && partition_moving_is_done)
|
|
{
|
|
task_table.finished_cluster_partitions.emplace(partition_name);
|
|
|
|
task_table.bytes_copied += cluster_partition.bytes_copied;
|
|
task_table.rows_copied += cluster_partition.rows_copied;
|
|
double elapsed = cluster_partition.elapsed_time_seconds;
|
|
|
|
LOG_INFO(log, "It took {} seconds to copy partition {}: {} uncompressed bytes, {} rows and {} source blocks are copied",
|
|
elapsed, partition_name,
|
|
formatReadableSizeWithDecimalSuffix(cluster_partition.bytes_copied),
|
|
formatReadableQuantity(cluster_partition.rows_copied),
|
|
cluster_partition.blocks_copied);
|
|
|
|
if (cluster_partition.rows_copied)
|
|
{
|
|
LOG_INFO(log, "Average partition speed: {} per second.", formatReadableSizeWithDecimalSuffix(cluster_partition.bytes_copied / elapsed));
|
|
}
|
|
|
|
if (task_table.rows_copied)
|
|
{
|
|
LOG_INFO(log, "Average table {} speed: {} per second.", task_table.table_id, formatReadableSizeWithDecimalSuffix(task_table.bytes_copied / elapsed));
|
|
}
|
|
}
|
|
}
|
|
|
|
UInt64 required_partitions = task_table.cluster_partitions.size();
|
|
UInt64 finished_partitions = task_table.finished_cluster_partitions.size();
|
|
bool table_is_done = finished_partitions >= required_partitions;
|
|
|
|
if (!table_is_done)
|
|
{
|
|
LOG_INFO(log, "Table {} is not processed yet.Copied {} of {}, will retry", task_table.table_id, finished_partitions, required_partitions);
|
|
}
|
|
else
|
|
{
|
|
/// Delete helping tables in case that whole table is done
|
|
dropHelpingTables(task_table);
|
|
}
|
|
|
|
return table_is_done;
|
|
}
|
|
|
|
TaskStatus ClusterCopier::tryCreateDestinationTable(const ConnectionTimeouts & timeouts, TaskTable & task_table)
|
|
{
|
|
/// Try create original table (if not exists) on each shard
|
|
|
|
//TaskTable & task_table = task_shard.task_table;
|
|
const TaskShardPtr task_shard = task_table.all_shards.at(0);
|
|
/// We need to update table definitions for each part, it could be changed after ALTER
|
|
task_shard->current_pull_table_create_query = getCreateTableForPullShard(timeouts, *task_shard);
|
|
try
|
|
{
|
|
auto create_query_push_ast
|
|
= rewriteCreateQueryStorage(task_shard->current_pull_table_create_query, task_table.table_push, task_table.engine_push_ast);
|
|
auto & create = create_query_push_ast->as<ASTCreateQuery &>();
|
|
create.if_not_exists = true;
|
|
InterpreterCreateQuery::prepareOnClusterQuery(create, getContext(), task_table.cluster_push_name);
|
|
String query = queryToString(create_query_push_ast);
|
|
|
|
LOG_DEBUG(log, "Create destination tables. Query: {}", query);
|
|
UInt64 shards = executeQueryOnCluster(task_table.cluster_push, query, task_cluster->settings_push, PoolMode::GET_MANY);
|
|
LOG_INFO(
|
|
log,
|
|
"Destination tables {} have been created on {} shards of {}",
|
|
getQuotedTable(task_table.table_push),
|
|
shards,
|
|
task_table.cluster_push->getShardCount());
|
|
if (shards != task_table.cluster_push->getShardCount())
|
|
{
|
|
return TaskStatus::Error;
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "Error while creating original table. Maybe we are not first.");
|
|
}
|
|
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
/// Job for copying partition from particular shard.
|
|
TaskStatus ClusterCopier::tryProcessPartitionTask(const ConnectionTimeouts & timeouts, ShardPartition & task_partition, bool is_unprioritized_task)
|
|
{
|
|
TaskStatus res;
|
|
|
|
try
|
|
{
|
|
res = iterateThroughAllPiecesInPartition(timeouts, task_partition, is_unprioritized_task);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred while processing partition " + task_partition.name);
|
|
res = TaskStatus::Error;
|
|
}
|
|
|
|
/// At the end of each task check if the config is updated
|
|
try
|
|
{
|
|
updateConfigIfNeeded();
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred while updating the config");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
TaskStatus ClusterCopier::iterateThroughAllPiecesInPartition(const ConnectionTimeouts & timeouts, ShardPartition & task_partition,
|
|
bool is_unprioritized_task)
|
|
{
|
|
const size_t total_number_of_pieces = task_partition.task_shard.task_table.number_of_splits;
|
|
|
|
TaskStatus res{TaskStatus::Finished};
|
|
|
|
bool was_failed_pieces = false;
|
|
bool was_active_pieces = false;
|
|
|
|
for (size_t piece_number = 0; piece_number < total_number_of_pieces; piece_number++)
|
|
{
|
|
for (UInt64 try_num = 0; try_num < max_shard_partition_tries; ++try_num)
|
|
{
|
|
LOG_INFO(log, "Attempt number {} to process partition {} piece number {} on shard number {} with index {}.",
|
|
try_num, task_partition.name, piece_number,
|
|
task_partition.task_shard.numberInCluster(),
|
|
task_partition.task_shard.indexInCluster());
|
|
|
|
res = processPartitionPieceTaskImpl(timeouts, task_partition, piece_number, is_unprioritized_task);
|
|
|
|
/// Exit if success
|
|
if (res == TaskStatus::Finished)
|
|
break;
|
|
|
|
/// Skip if the task is being processed by someone
|
|
if (res == TaskStatus::Active)
|
|
break;
|
|
|
|
/// Repeat on errors
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
}
|
|
|
|
was_active_pieces = (res == TaskStatus::Active);
|
|
was_failed_pieces = (res == TaskStatus::Error);
|
|
}
|
|
|
|
if (was_failed_pieces)
|
|
return TaskStatus::Error;
|
|
|
|
if (was_active_pieces)
|
|
return TaskStatus::Active;
|
|
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
|
|
TaskStatus ClusterCopier::processPartitionPieceTaskImpl(
|
|
const ConnectionTimeouts & timeouts, ShardPartition & task_partition,
|
|
const size_t current_piece_number, bool is_unprioritized_task)
|
|
{
|
|
TaskShard & task_shard = task_partition.task_shard;
|
|
TaskTable & task_table = task_shard.task_table;
|
|
ClusterPartition & cluster_partition = task_table.getClusterPartition(task_partition.name);
|
|
ShardPartitionPiece & partition_piece = task_partition.pieces[current_piece_number];
|
|
|
|
const size_t number_of_splits = task_table.number_of_splits;
|
|
const String primary_key_comma_separated = task_table.primary_key_comma_separated;
|
|
|
|
/// We need to update table definitions for each partition, it could be changed after ALTER
|
|
createShardInternalTables(timeouts, task_shard, true);
|
|
|
|
auto split_table_for_current_piece = task_shard.list_of_split_tables_on_shard[current_piece_number];
|
|
|
|
auto zookeeper = getContext()->getZooKeeper();
|
|
|
|
const String piece_is_dirty_flag_path = partition_piece.getPartitionPieceIsDirtyPath();
|
|
const String piece_is_dirty_cleaned_path = partition_piece.getPartitionPieceIsCleanedPath();
|
|
const String current_task_piece_is_active_path = partition_piece.getActiveWorkerPath();
|
|
const String current_task_piece_status_path = partition_piece.getShardStatusPath();
|
|
|
|
/// Auxiliary functions:
|
|
|
|
/// Creates is_dirty node to initialize DROP PARTITION
|
|
auto create_is_dirty_node = [&] (const CleanStateClock & clock)
|
|
{
|
|
if (clock.is_stale())
|
|
LOG_DEBUG(log, "Clean state clock is stale while setting dirty flag, cowardly bailing");
|
|
else if (!clock.is_clean())
|
|
LOG_DEBUG(log, "Thank you, Captain Obvious");
|
|
else if (clock.discovery_version)
|
|
{
|
|
LOG_DEBUG(log, "Updating clean state clock");
|
|
zookeeper->set(piece_is_dirty_flag_path, host_id, clock.discovery_version.value());
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Creating clean state clock");
|
|
zookeeper->create(piece_is_dirty_flag_path, host_id, zkutil::CreateMode::Persistent);
|
|
}
|
|
};
|
|
|
|
/// Returns SELECT query filtering current partition and applying user filter
|
|
auto get_select_query = [&] (const DatabaseAndTableName & from_table, const String & fields, bool enable_splitting, String limit = "")
|
|
{
|
|
String query;
|
|
query += "SELECT " + fields + " FROM " + getQuotedTable(from_table);
|
|
|
|
if (enable_splitting && experimental_use_sample_offset)
|
|
query += " SAMPLE 1/" + toString(number_of_splits) + " OFFSET " + toString(current_piece_number) + "/" + toString(number_of_splits);
|
|
|
|
/// TODO: Bad, it is better to rewrite with ASTLiteral(partition_key_field)
|
|
query += " WHERE (" + queryToString(task_table.engine_push_partition_key_ast) + " = (" + task_partition.name + " AS partition_key))";
|
|
|
|
if (enable_splitting && !experimental_use_sample_offset)
|
|
query += " AND ( cityHash64(" + primary_key_comma_separated + ") %" + toString(number_of_splits) + " = " + toString(current_piece_number) + " )";
|
|
|
|
if (!task_table.where_condition_str.empty())
|
|
query += " AND (" + task_table.where_condition_str + ")";
|
|
|
|
if (!limit.empty())
|
|
query += " LIMIT " + limit;
|
|
|
|
ParserQuery p_query(query.data() + query.size());
|
|
|
|
const auto & settings = getContext()->getSettingsRef();
|
|
return parseQuery(p_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
};
|
|
|
|
/// Load balancing
|
|
auto worker_node_holder = createTaskWorkerNodeAndWaitIfNeed(zookeeper, current_task_piece_status_path, is_unprioritized_task);
|
|
|
|
LOG_DEBUG(log, "Processing {}", current_task_piece_status_path);
|
|
|
|
const String piece_status_path = partition_piece.getPartitionPieceShardsPath();
|
|
|
|
CleanStateClock clean_state_clock(zookeeper, piece_is_dirty_flag_path, piece_is_dirty_cleaned_path);
|
|
|
|
const bool is_clean = checkPartitionPieceIsClean(zookeeper, clean_state_clock, piece_status_path);
|
|
|
|
/// Do not start if partition piece is dirty, try to clean it
|
|
if (is_clean)
|
|
{
|
|
LOG_DEBUG(log, "Partition {} piece {} appears to be clean", task_partition.name, current_piece_number);
|
|
zookeeper->createAncestors(current_task_piece_status_path);
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Partition {} piece {} is dirty, try to drop it", task_partition.name, current_piece_number);
|
|
|
|
try
|
|
{
|
|
tryDropPartitionPiece(task_partition, current_piece_number, zookeeper, clean_state_clock);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred when clean partition");
|
|
}
|
|
|
|
return TaskStatus::Error;
|
|
}
|
|
|
|
/// Create ephemeral node to mark that we are active and process the partition
|
|
zookeeper->createAncestors(current_task_piece_is_active_path);
|
|
zkutil::EphemeralNodeHolderPtr partition_task_node_holder;
|
|
try
|
|
{
|
|
partition_task_node_holder = zkutil::EphemeralNodeHolder::create(current_task_piece_is_active_path, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::Error::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Someone is already processing {}", current_task_piece_is_active_path);
|
|
return TaskStatus::Active;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
/// Exit if task has been already processed;
|
|
/// create blocking node to signal cleaning up if it is abandoned
|
|
{
|
|
String status_data;
|
|
if (zookeeper->tryGet(current_task_piece_status_path, status_data))
|
|
{
|
|
TaskStateWithOwner status = TaskStateWithOwner::fromString(status_data);
|
|
if (status.state == TaskState::Finished)
|
|
{
|
|
LOG_DEBUG(log, "Task {} has been successfully executed by {}", current_task_piece_status_path, status.owner);
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
/// Task is abandoned, because previously we created ephemeral node, possibly in other copier's process.
|
|
/// Initialize DROP PARTITION
|
|
LOG_DEBUG(log, "Task {} has not been successfully finished by {}. Partition will be dropped and refilled.", current_task_piece_status_path, status.owner);
|
|
|
|
create_is_dirty_node(clean_state_clock);
|
|
return TaskStatus::Error;
|
|
}
|
|
}
|
|
|
|
|
|
/// Exit if current piece is absent on this shard. Also mark it as finished, because we will check
|
|
/// whether each shard have processed each partitition (and its pieces).
|
|
if (partition_piece.is_absent_piece)
|
|
{
|
|
String state_finished = TaskStateWithOwner::getData(TaskState::Finished, host_id);
|
|
auto res = zookeeper->tryCreate(current_task_piece_status_path, state_finished, zkutil::CreateMode::Persistent);
|
|
if (res == Coordination::Error::ZNODEEXISTS)
|
|
LOG_DEBUG(log, "Partition {} piece {} is absent on current replica of a shard. But other replicas have already marked it as done.", task_partition.name, current_piece_number);
|
|
if (res == Coordination::Error::ZOK)
|
|
LOG_DEBUG(log, "Partition {} piece {} is absent on current replica of a shard. Will mark it as done. Other replicas will do the same.", task_partition.name, current_piece_number);
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
/// Check that destination partition is empty if we are first worker
|
|
/// NOTE: this check is incorrect if pull and push tables have different partition key!
|
|
String clean_start_status;
|
|
if (!zookeeper->tryGet(partition_piece.getPartitionPieceCleanStartPath(), clean_start_status) || clean_start_status != "ok")
|
|
{
|
|
zookeeper->createIfNotExists(partition_piece.getPartitionPieceCleanStartPath(), "");
|
|
auto checker = zkutil::EphemeralNodeHolder::create(partition_piece.getPartitionPieceCleanStartPath() + "/checker",
|
|
*zookeeper, host_id);
|
|
// Maybe we are the first worker
|
|
|
|
ASTPtr query_select_ast = get_select_query(split_table_for_current_piece, "count()", /*enable_splitting*/ true);
|
|
UInt64 count;
|
|
{
|
|
auto local_context = Context::createCopy(context);
|
|
// Use pull (i.e. readonly) settings, but fetch data from destination servers
|
|
local_context->setSettings(task_cluster->settings_pull);
|
|
local_context->setSetting("skip_unavailable_shards", true);
|
|
|
|
Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_select_ast, local_context)->execute().getInputStream());
|
|
count = (block) ? block.safeGetByPosition(0).column->getUInt(0) : 0;
|
|
}
|
|
|
|
if (count != 0)
|
|
{
|
|
LOG_INFO(log, "Partition {} piece {}is not empty. In contains {} rows.", task_partition.name, current_piece_number, count);
|
|
Coordination::Stat stat_shards{};
|
|
zookeeper->get(partition_piece.getPartitionPieceShardsPath(), &stat_shards);
|
|
|
|
/// NOTE: partition is still fresh if dirt discovery happens before cleaning
|
|
if (stat_shards.numChildren == 0)
|
|
{
|
|
LOG_WARNING(log, "There are no workers for partition {} piece {}, but destination table contains {} rows. Partition will be dropped and refilled.", task_partition.name, toString(current_piece_number), count);
|
|
|
|
create_is_dirty_node(clean_state_clock);
|
|
return TaskStatus::Error;
|
|
}
|
|
}
|
|
zookeeper->set(partition_piece.getPartitionPieceCleanStartPath(), "ok");
|
|
}
|
|
/// At this point, we need to sync that the destination table is clean
|
|
/// before any actual work
|
|
|
|
/// Try start processing, create node about it
|
|
{
|
|
String start_state = TaskStateWithOwner::getData(TaskState::Started, host_id);
|
|
CleanStateClock new_clean_state_clock(zookeeper, piece_is_dirty_flag_path, piece_is_dirty_cleaned_path);
|
|
if (clean_state_clock != new_clean_state_clock)
|
|
{
|
|
LOG_INFO(log, "Partition {} piece {} clean state changed, cowardly bailing", task_partition.name, toString(current_piece_number));
|
|
return TaskStatus::Error;
|
|
}
|
|
else if (!new_clean_state_clock.is_clean())
|
|
{
|
|
LOG_INFO(log, "Partition {} piece {} is dirty and will be dropped and refilled", task_partition.name, toString(current_piece_number));
|
|
create_is_dirty_node(new_clean_state_clock);
|
|
return TaskStatus::Error;
|
|
}
|
|
zookeeper->create(current_task_piece_status_path, start_state, zkutil::CreateMode::Persistent);
|
|
}
|
|
|
|
/// Try create table (if not exists) on each shard
|
|
{
|
|
/// Define push table for current partition piece
|
|
auto database_and_table_for_current_piece= std::pair<String, String>(
|
|
task_table.table_push.first,
|
|
task_table.table_push.second + "_piece_" + toString(current_piece_number));
|
|
|
|
auto new_engine_push_ast = task_table.engine_push_ast;
|
|
if (task_table.isReplicatedTable())
|
|
{
|
|
new_engine_push_ast = task_table.rewriteReplicatedCreateQueryToPlain();
|
|
}
|
|
|
|
auto create_query_push_ast = rewriteCreateQueryStorage(
|
|
task_shard.current_pull_table_create_query,
|
|
database_and_table_for_current_piece, new_engine_push_ast);
|
|
|
|
create_query_push_ast->as<ASTCreateQuery &>().if_not_exists = true;
|
|
String query = queryToString(create_query_push_ast);
|
|
|
|
LOG_DEBUG(log, "Create destination tables. Query: {}", query);
|
|
UInt64 shards = executeQueryOnCluster(task_table.cluster_push, query, task_cluster->settings_push, PoolMode::GET_MANY);
|
|
LOG_INFO(
|
|
log,
|
|
"Destination tables {} have been created on {} shards of {}",
|
|
getQuotedTable(task_table.table_push),
|
|
shards,
|
|
task_table.cluster_push->getShardCount());
|
|
|
|
if (shards != task_table.cluster_push->getShardCount())
|
|
{
|
|
return TaskStatus::Error;
|
|
}
|
|
}
|
|
|
|
/// Do the copying
|
|
{
|
|
bool inject_fault = false;
|
|
if (copy_fault_probability > 0)
|
|
{
|
|
double value = std::uniform_real_distribution<>(0, 1)(task_table.task_cluster.random_engine);
|
|
inject_fault = value < copy_fault_probability;
|
|
}
|
|
|
|
// Select all fields
|
|
ASTPtr query_select_ast = get_select_query(task_shard.table_read_shard, "*", /*enable_splitting*/ true, inject_fault ? "1" : "");
|
|
|
|
LOG_DEBUG(log, "Executing SELECT query and pull from {} : {}", task_shard.getDescription(), queryToString(query_select_ast));
|
|
|
|
ASTPtr query_insert_ast;
|
|
{
|
|
String query;
|
|
query += "INSERT INTO " + getQuotedTable(split_table_for_current_piece) + " VALUES ";
|
|
|
|
ParserQuery p_query(query.data() + query.size());
|
|
const auto & settings = getContext()->getSettingsRef();
|
|
query_insert_ast = parseQuery(p_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
LOG_DEBUG(log, "Executing INSERT query: {}", query);
|
|
}
|
|
|
|
try
|
|
{
|
|
auto context_select = Context::createCopy(context);
|
|
context_select->setSettings(task_cluster->settings_pull);
|
|
|
|
auto context_insert = Context::createCopy(context);
|
|
context_insert->setSettings(task_cluster->settings_push);
|
|
|
|
/// Custom INSERT SELECT implementation
|
|
BlockInputStreamPtr input;
|
|
BlockOutputStreamPtr output;
|
|
{
|
|
BlockIO io_select = InterpreterFactory::get(query_select_ast, context_select)->execute();
|
|
BlockIO io_insert = InterpreterFactory::get(query_insert_ast, context_insert)->execute();
|
|
|
|
input = io_select.getInputStream();
|
|
output = io_insert.out;
|
|
}
|
|
|
|
/// Fail-fast optimization to abort copying when the current clean state expires
|
|
std::future<Coordination::ExistsResponse> future_is_dirty_checker;
|
|
|
|
Stopwatch watch(CLOCK_MONOTONIC_COARSE);
|
|
constexpr UInt64 check_period_milliseconds = 500;
|
|
|
|
/// Will asynchronously check that ZooKeeper connection and is_dirty flag appearing while copying data
|
|
auto cancel_check = [&] ()
|
|
{
|
|
if (zookeeper->expired())
|
|
throw Exception("ZooKeeper session is expired, cancel INSERT SELECT", ErrorCodes::UNFINISHED);
|
|
|
|
if (!future_is_dirty_checker.valid())
|
|
future_is_dirty_checker = zookeeper->asyncExists(piece_is_dirty_flag_path);
|
|
|
|
/// check_period_milliseconds should less than average insert time of single block
|
|
/// Otherwise, the insertion will slow a little bit
|
|
if (watch.elapsedMilliseconds() >= check_period_milliseconds)
|
|
{
|
|
Coordination::ExistsResponse status = future_is_dirty_checker.get();
|
|
|
|
if (status.error != Coordination::Error::ZNONODE)
|
|
{
|
|
LogicalClock dirt_discovery_epoch (status.stat.mzxid);
|
|
if (dirt_discovery_epoch == clean_state_clock.discovery_zxid)
|
|
return false;
|
|
throw Exception("Partition is dirty, cancel INSERT SELECT", ErrorCodes::UNFINISHED);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
};
|
|
|
|
/// Update statistics
|
|
/// It is quite rough: bytes_copied don't take into account DROP PARTITION.
|
|
auto update_stats = [&cluster_partition] (const Block & block)
|
|
{
|
|
cluster_partition.bytes_copied += block.bytes();
|
|
cluster_partition.rows_copied += block.rows();
|
|
cluster_partition.blocks_copied += 1;
|
|
};
|
|
|
|
/// Main work is here
|
|
copyData(*input, *output, cancel_check, update_stats);
|
|
|
|
// Just in case
|
|
if (future_is_dirty_checker.valid())
|
|
future_is_dirty_checker.get();
|
|
|
|
if (inject_fault)
|
|
throw Exception("Copy fault injection is activated", ErrorCodes::UNFINISHED);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred during copying, partition will be marked as dirty");
|
|
create_is_dirty_node(clean_state_clock);
|
|
return TaskStatus::Error;
|
|
}
|
|
}
|
|
|
|
LOG_INFO(log, "Partition {} piece {} copied. But not moved to original destination table.", task_partition.name, toString(current_piece_number));
|
|
|
|
/// Finalize the processing, change state of current partition task (and also check is_dirty flag)
|
|
{
|
|
String state_finished = TaskStateWithOwner::getData(TaskState::Finished, host_id);
|
|
CleanStateClock new_clean_state_clock (zookeeper, piece_is_dirty_flag_path, piece_is_dirty_cleaned_path);
|
|
if (clean_state_clock != new_clean_state_clock)
|
|
{
|
|
LOG_INFO(log, "Partition {} piece {} clean state changed, cowardly bailing", task_partition.name, toString(current_piece_number));
|
|
return TaskStatus::Error;
|
|
}
|
|
else if (!new_clean_state_clock.is_clean())
|
|
{
|
|
LOG_INFO(log, "Partition {} piece {} became dirty and will be dropped and refilled", task_partition.name, toString(current_piece_number));
|
|
create_is_dirty_node(new_clean_state_clock);
|
|
return TaskStatus::Error;
|
|
}
|
|
zookeeper->set(current_task_piece_status_path, state_finished, 0);
|
|
}
|
|
|
|
return TaskStatus::Finished;
|
|
}
|
|
|
|
void ClusterCopier::dropAndCreateLocalTable(const ASTPtr & create_ast)
|
|
{
|
|
const auto & create = create_ast->as<ASTCreateQuery &>();
|
|
dropLocalTableIfExists({create.database, create.table});
|
|
|
|
InterpreterCreateQuery interpreter(create_ast, getContext());
|
|
interpreter.execute();
|
|
}
|
|
|
|
void ClusterCopier::dropLocalTableIfExists(const DatabaseAndTableName & table_name) const
|
|
{
|
|
auto drop_ast = std::make_shared<ASTDropQuery>();
|
|
drop_ast->if_exists = true;
|
|
drop_ast->database = table_name.first;
|
|
drop_ast->table = table_name.second;
|
|
|
|
InterpreterDropQuery interpreter(drop_ast, getContext());
|
|
interpreter.execute();
|
|
}
|
|
|
|
void ClusterCopier::dropHelpingTablesByPieceNumber(const TaskTable & task_table, size_t current_piece_number)
|
|
{
|
|
LOG_DEBUG(log, "Removing helping tables piece {}", current_piece_number);
|
|
|
|
DatabaseAndTableName original_table = task_table.table_push;
|
|
DatabaseAndTableName helping_table
|
|
= DatabaseAndTableName(original_table.first, original_table.second + "_piece_" + toString(current_piece_number));
|
|
|
|
String query = "DROP TABLE IF EXISTS " + getQuotedTable(helping_table);
|
|
|
|
const ClusterPtr & cluster_push = task_table.cluster_push;
|
|
Settings settings_push = task_cluster->settings_push;
|
|
|
|
LOG_DEBUG(log, "Execute distributed DROP TABLE: {}", query);
|
|
|
|
/// We have to drop partition_piece on each replica
|
|
UInt64 num_nodes = executeQueryOnCluster(cluster_push, query, settings_push, PoolMode::GET_MANY, ClusterExecutionMode::ON_EACH_NODE);
|
|
|
|
LOG_INFO(log, "DROP TABLE query was successfully executed on {} nodes.", toString(num_nodes));
|
|
}
|
|
|
|
void ClusterCopier::dropHelpingTables(const TaskTable & task_table)
|
|
{
|
|
LOG_DEBUG(log, "Removing helping tables");
|
|
for (size_t current_piece_number = 0; current_piece_number < task_table.number_of_splits; ++current_piece_number)
|
|
{
|
|
dropHelpingTablesByPieceNumber(task_table, current_piece_number);
|
|
}
|
|
}
|
|
|
|
void ClusterCopier::dropParticularPartitionPieceFromAllHelpingTables(const TaskTable & task_table, const String & partition_name)
|
|
{
|
|
LOG_DEBUG(log, "Try drop partition partition from all helping tables.");
|
|
for (size_t current_piece_number = 0; current_piece_number < task_table.number_of_splits; ++current_piece_number)
|
|
{
|
|
DatabaseAndTableName original_table = task_table.table_push;
|
|
DatabaseAndTableName helping_table = DatabaseAndTableName(original_table.first, original_table.second + "_piece_" + toString(current_piece_number));
|
|
|
|
String query = "ALTER TABLE " + getQuotedTable(helping_table) + ((partition_name == "'all'") ? " DROP PARTITION ID " : " DROP PARTITION ") + partition_name;
|
|
|
|
const ClusterPtr & cluster_push = task_table.cluster_push;
|
|
Settings settings_push = task_cluster->settings_push;
|
|
|
|
LOG_DEBUG(log, "Execute distributed DROP PARTITION: {}", query);
|
|
/// We have to drop partition_piece on each replica
|
|
UInt64 num_nodes = executeQueryOnCluster(
|
|
cluster_push, query,
|
|
settings_push,
|
|
PoolMode::GET_MANY,
|
|
ClusterExecutionMode::ON_EACH_NODE);
|
|
|
|
LOG_INFO(log, "DROP PARTITION query was successfully executed on {} nodes.", toString(num_nodes));
|
|
}
|
|
LOG_DEBUG(log, "All helping tables dropped partition {}", partition_name);
|
|
}
|
|
|
|
String ClusterCopier::getRemoteCreateTable(const DatabaseAndTableName & table, Connection & connection, const Settings & settings)
|
|
{
|
|
auto remote_context = Context::createCopy(context);
|
|
remote_context->setSettings(settings);
|
|
|
|
String query = "SHOW CREATE TABLE " + getQuotedTable(table);
|
|
Block block = getBlockWithAllStreamData(std::make_shared<RemoteBlockInputStream>(
|
|
connection, query, InterpreterShowCreateQuery::getSampleBlock(), remote_context));
|
|
|
|
return typeid_cast<const ColumnString &>(*block.safeGetByPosition(0).column).getDataAt(0).toString();
|
|
}
|
|
|
|
ASTPtr ClusterCopier::getCreateTableForPullShard(const ConnectionTimeouts & timeouts, TaskShard & task_shard)
|
|
{
|
|
/// Fetch and parse (possibly) new definition
|
|
auto connection_entry = task_shard.info.pool->get(timeouts, &task_cluster->settings_pull, true);
|
|
String create_query_pull_str = getRemoteCreateTable(
|
|
task_shard.task_table.table_pull,
|
|
*connection_entry,
|
|
task_cluster->settings_pull);
|
|
|
|
ParserCreateQuery parser_create_query;
|
|
const auto & settings = getContext()->getSettingsRef();
|
|
return parseQuery(parser_create_query, create_query_pull_str, settings.max_query_size, settings.max_parser_depth);
|
|
}
|
|
|
|
/// If it is implicitly asked to create split Distributed table for certain piece on current shard, we will do it.
|
|
void ClusterCopier::createShardInternalTables(const ConnectionTimeouts & timeouts,
|
|
TaskShard & task_shard, bool create_split)
|
|
{
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
/// We need to update table definitions for each part, it could be changed after ALTER
|
|
task_shard.current_pull_table_create_query = getCreateTableForPullShard(timeouts, task_shard);
|
|
|
|
/// Create local Distributed tables:
|
|
/// a table fetching data from current shard and a table inserting data to the whole destination cluster
|
|
String read_shard_prefix = ".read_shard_" + toString(task_shard.indexInCluster()) + ".";
|
|
String split_shard_prefix = ".split.";
|
|
task_shard.table_read_shard = DatabaseAndTableName(working_database_name, read_shard_prefix + task_table.table_id);
|
|
task_shard.main_table_split_shard = DatabaseAndTableName(working_database_name, split_shard_prefix + task_table.table_id);
|
|
|
|
for (const auto & piece_number : ext::range(0, task_table.number_of_splits))
|
|
{
|
|
task_shard.list_of_split_tables_on_shard[piece_number] =
|
|
DatabaseAndTableName(working_database_name, split_shard_prefix + task_table.table_id + "_piece_" + toString(piece_number));
|
|
}
|
|
|
|
/// Create special cluster with single shard
|
|
String shard_read_cluster_name = read_shard_prefix + task_table.cluster_pull_name;
|
|
ClusterPtr cluster_pull_current_shard = task_table.cluster_pull->getClusterWithSingleShard(task_shard.indexInCluster());
|
|
getContext()->setCluster(shard_read_cluster_name, cluster_pull_current_shard);
|
|
|
|
auto storage_shard_ast = createASTStorageDistributed(shard_read_cluster_name, task_table.table_pull.first, task_table.table_pull.second);
|
|
|
|
auto create_query_ast = removeAliasColumnsFromCreateQuery(task_shard.current_pull_table_create_query);
|
|
|
|
auto create_table_pull_ast = rewriteCreateQueryStorage(create_query_ast, task_shard.table_read_shard, storage_shard_ast);
|
|
dropAndCreateLocalTable(create_table_pull_ast);
|
|
|
|
if (create_split)
|
|
{
|
|
auto create_table_split_piece_ast = rewriteCreateQueryStorage(
|
|
create_query_ast,
|
|
task_shard.main_table_split_shard,
|
|
task_table.main_engine_split_ast);
|
|
|
|
dropAndCreateLocalTable(create_table_split_piece_ast);
|
|
|
|
/// Create auxiliary split tables for each piece
|
|
for (const auto & piece_number : ext::range(0, task_table.number_of_splits))
|
|
{
|
|
const auto & storage_piece_split_ast = task_table.auxiliary_engine_split_asts[piece_number];
|
|
|
|
create_table_split_piece_ast = rewriteCreateQueryStorage(
|
|
create_query_ast,
|
|
task_shard.list_of_split_tables_on_shard[piece_number],
|
|
storage_piece_split_ast);
|
|
|
|
dropAndCreateLocalTable(create_table_split_piece_ast);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
std::set<String> ClusterCopier::getShardPartitions(const ConnectionTimeouts & timeouts, TaskShard & task_shard)
|
|
{
|
|
std::set<String> res;
|
|
|
|
createShardInternalTables(timeouts, task_shard, false);
|
|
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
const String & partition_name = queryToString(task_table.engine_push_partition_key_ast);
|
|
|
|
if (partition_name == "'all'")
|
|
{
|
|
res.emplace("'all'");
|
|
return res;
|
|
}
|
|
|
|
String query;
|
|
{
|
|
WriteBufferFromOwnString wb;
|
|
wb << "SELECT DISTINCT " << partition_name << " AS partition FROM"
|
|
<< " " << getQuotedTable(task_shard.table_read_shard) << " ORDER BY partition DESC";
|
|
query = wb.str();
|
|
}
|
|
|
|
ParserQuery parser_query(query.data() + query.size());
|
|
const auto & settings = getContext()->getSettingsRef();
|
|
ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
LOG_DEBUG(log, "Computing destination partition set, executing query: {}", query);
|
|
|
|
auto local_context = Context::createCopy(context);
|
|
local_context->setSettings(task_cluster->settings_pull);
|
|
Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_ast, local_context)->execute().getInputStream());
|
|
|
|
if (block)
|
|
{
|
|
ColumnWithTypeAndName & column = block.getByPosition(0);
|
|
task_shard.partition_key_column = column;
|
|
|
|
for (size_t i = 0; i < column.column->size(); ++i)
|
|
{
|
|
WriteBufferFromOwnString wb;
|
|
column.type->getDefaultSerialization()->serializeTextQuoted(*column.column, i, wb, FormatSettings());
|
|
res.emplace(wb.str());
|
|
}
|
|
}
|
|
|
|
LOG_DEBUG(log, "There are {} destination partitions in shard {}", res.size(), task_shard.getDescription());
|
|
|
|
return res;
|
|
}
|
|
|
|
bool ClusterCopier::checkShardHasPartition(const ConnectionTimeouts & timeouts,
|
|
TaskShard & task_shard, const String & partition_quoted_name)
|
|
{
|
|
createShardInternalTables(timeouts, task_shard, false);
|
|
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
std::string query = "SELECT 1 FROM " + getQuotedTable(task_shard.table_read_shard)
|
|
+ " WHERE (" + queryToString(task_table.engine_push_partition_key_ast) +
|
|
" = (" + partition_quoted_name + " AS partition_key))";
|
|
|
|
if (!task_table.where_condition_str.empty())
|
|
query += " AND (" + task_table.where_condition_str + ")";
|
|
|
|
query += " LIMIT 1";
|
|
|
|
LOG_DEBUG(log, "Checking shard {} for partition {} existence, executing query: {}", task_shard.getDescription(), partition_quoted_name, query);
|
|
|
|
ParserQuery parser_query(query.data() + query.size());
|
|
const auto & settings = getContext()->getSettingsRef();
|
|
ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
auto local_context = Context::createCopy(context);
|
|
local_context->setSettings(task_cluster->settings_pull);
|
|
return InterpreterFactory::get(query_ast, local_context)->execute().getInputStream()->read().rows() != 0;
|
|
}
|
|
|
|
bool ClusterCopier::checkPresentPartitionPiecesOnCurrentShard(const ConnectionTimeouts & timeouts,
|
|
TaskShard & task_shard, const String & partition_quoted_name, size_t current_piece_number)
|
|
{
|
|
createShardInternalTables(timeouts, task_shard, false);
|
|
|
|
TaskTable & task_table = task_shard.task_table;
|
|
const size_t number_of_splits = task_table.number_of_splits;
|
|
const String & primary_key_comma_separated = task_table.primary_key_comma_separated;
|
|
|
|
UNUSED(primary_key_comma_separated);
|
|
|
|
std::string query = "SELECT 1 FROM " + getQuotedTable(task_shard.table_read_shard);
|
|
|
|
if (experimental_use_sample_offset)
|
|
query += " SAMPLE 1/" + toString(number_of_splits) + " OFFSET " + toString(current_piece_number) + "/" + toString(number_of_splits);
|
|
|
|
query += " WHERE (" + queryToString(task_table.engine_push_partition_key_ast)
|
|
+ " = (" + partition_quoted_name + " AS partition_key))";
|
|
|
|
if (!experimental_use_sample_offset)
|
|
query += " AND (cityHash64(" + primary_key_comma_separated + ") % "
|
|
+ std::to_string(number_of_splits) + " = " + std::to_string(current_piece_number) + " )";
|
|
|
|
if (!task_table.where_condition_str.empty())
|
|
query += " AND (" + task_table.where_condition_str + ")";
|
|
|
|
query += " LIMIT 1";
|
|
|
|
LOG_DEBUG(log, "Checking shard {} for partition {} piece {} existence, executing query: {}", task_shard.getDescription(), partition_quoted_name, std::to_string(current_piece_number), query);
|
|
|
|
ParserQuery parser_query(query.data() + query.size());
|
|
const auto & settings = getContext()->getSettingsRef();
|
|
ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
auto local_context = Context::createCopy(context);
|
|
local_context->setSettings(task_cluster->settings_pull);
|
|
auto result = InterpreterFactory::get(query_ast, local_context)->execute().getInputStream()->read().rows();
|
|
if (result != 0)
|
|
LOG_DEBUG(log, "Partition {} piece number {} is PRESENT on shard {}", partition_quoted_name, std::to_string(current_piece_number), task_shard.getDescription());
|
|
else
|
|
LOG_DEBUG(log, "Partition {} piece number {} is ABSENT on shard {}", partition_quoted_name, std::to_string(current_piece_number), task_shard.getDescription());
|
|
return result != 0;
|
|
}
|
|
|
|
/** Executes simple query (without output streams, for example DDL queries) on each shard of the cluster
|
|
* Returns number of shards for which at least one replica executed query successfully
|
|
*/
|
|
UInt64 ClusterCopier::executeQueryOnCluster(
|
|
const ClusterPtr & cluster,
|
|
const String & query,
|
|
const Settings & current_settings,
|
|
PoolMode pool_mode,
|
|
ClusterExecutionMode execution_mode,
|
|
UInt64 max_successful_executions_per_shard) const
|
|
{
|
|
auto num_shards = cluster->getShardsInfo().size();
|
|
std::vector<UInt64> per_shard_num_successful_replicas(num_shards, 0);
|
|
|
|
ParserQuery p_query(query.data() + query.size());
|
|
ASTPtr query_ast = parseQuery(p_query, query, current_settings.max_query_size, current_settings.max_parser_depth);
|
|
|
|
/// We will have to execute query on each replica of a shard.
|
|
if (execution_mode == ClusterExecutionMode::ON_EACH_NODE)
|
|
max_successful_executions_per_shard = 0;
|
|
|
|
std::atomic<size_t> origin_replicas_number = 0;
|
|
|
|
/// We need to execute query on one replica at least
|
|
auto do_for_shard = [&] (UInt64 shard_index, Settings shard_settings)
|
|
{
|
|
setThreadName("QueryForShard");
|
|
|
|
const Cluster::ShardInfo & shard = cluster->getShardsInfo().at(shard_index);
|
|
UInt64 & num_successful_executions = per_shard_num_successful_replicas.at(shard_index);
|
|
num_successful_executions = 0;
|
|
|
|
auto increment_and_check_exit = [&] () -> bool
|
|
{
|
|
++num_successful_executions;
|
|
return max_successful_executions_per_shard && num_successful_executions >= max_successful_executions_per_shard;
|
|
};
|
|
|
|
UInt64 num_replicas = cluster->getShardsAddresses().at(shard_index).size();
|
|
|
|
origin_replicas_number += num_replicas;
|
|
UInt64 num_local_replicas = shard.getLocalNodeCount();
|
|
UInt64 num_remote_replicas = num_replicas - num_local_replicas;
|
|
|
|
/// In that case we don't have local replicas, but do it just in case
|
|
for (UInt64 i = 0; i < num_local_replicas; ++i)
|
|
{
|
|
auto interpreter = InterpreterFactory::get(query_ast, getContext());
|
|
interpreter->execute();
|
|
|
|
if (increment_and_check_exit())
|
|
return;
|
|
}
|
|
|
|
/// Will try to make as many as possible queries
|
|
if (shard.hasRemoteConnections())
|
|
{
|
|
shard_settings.max_parallel_replicas = num_remote_replicas ? num_remote_replicas : 1;
|
|
|
|
auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(shard_settings).getSaturated(shard_settings.max_execution_time);
|
|
auto connections = shard.pool->getMany(timeouts, &shard_settings, pool_mode);
|
|
|
|
auto shard_context = Context::createCopy(context);
|
|
shard_context->setSettings(shard_settings);
|
|
|
|
for (auto & connection : connections)
|
|
{
|
|
if (connection.isNull())
|
|
continue;
|
|
|
|
try
|
|
{
|
|
/// CREATE TABLE and DROP PARTITION queries return empty block
|
|
RemoteBlockInputStream stream{*connection, query, Block{}, shard_context};
|
|
NullBlockOutputStream output{Block{}};
|
|
copyData(stream, output);
|
|
|
|
if (increment_and_check_exit())
|
|
return;
|
|
}
|
|
catch (const Exception &)
|
|
{
|
|
LOG_INFO(log, getCurrentExceptionMessage(false, true));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
{
|
|
ThreadPool thread_pool(std::min<UInt64>(num_shards, getNumberOfPhysicalCPUCores()));
|
|
|
|
for (UInt64 shard_index = 0; shard_index < num_shards; ++shard_index)
|
|
thread_pool.scheduleOrThrowOnError([=, shard_settings = current_settings] { do_for_shard(shard_index, std::move(shard_settings)); });
|
|
|
|
thread_pool.wait();
|
|
}
|
|
|
|
UInt64 successful_nodes = 0;
|
|
for (UInt64 num_replicas : per_shard_num_successful_replicas)
|
|
{
|
|
if (execution_mode == ClusterExecutionMode::ON_EACH_NODE)
|
|
successful_nodes += num_replicas;
|
|
else
|
|
/// Count only successful shards
|
|
successful_nodes += (num_replicas > 0);
|
|
}
|
|
|
|
if (execution_mode == ClusterExecutionMode::ON_EACH_NODE && successful_nodes != origin_replicas_number)
|
|
{
|
|
LOG_INFO(log, "There was an error while executing ALTER on each node. Query was executed on {} nodes. But had to be executed on {}", toString(successful_nodes), toString(origin_replicas_number.load()));
|
|
}
|
|
|
|
return successful_nodes;
|
|
}
|
|
|
|
}
|