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1895 lines
78 KiB
C++
1895 lines
78 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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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 = context.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::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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context.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 = context.getCluster(task_table.cluster_pull_name);
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task_table.cluster_push = context.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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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->deserializeAsTextQuoted(*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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std::stringstream 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 = context.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 && 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 && !force) ? "not " : ""), local_task_description_path, code, zookeeper->error2string(code));
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}
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void ClusterCopier::reloadTaskDescription()
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{
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auto zookeeper = context.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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int 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)
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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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context.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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/// Delete helping tables in both cases (whole table is done or not)
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dropHelpingTables(task_table);
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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 achive 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::ZOK || code == Coordination::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::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 = context.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);
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const String piece_task_status_path = task_table.getCertainPartitionPieceTaskStatusPath(partition_name, piece_number);
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CleanStateClock clean_state_clock (zookeeper, piece_is_dirty_flag_path, piece_is_dirty_cleaned_path);
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const bool is_clean = checkPartitionPieceIsClean(zookeeper, clean_state_clock, piece_task_status_path);
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if (!is_clean)
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{
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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 destionation table", partition_name);
|
|
|
|
auto zookeeper = context.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::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;
|
|
|
|
/// It is important, ALTER ATTACH PARTITION must be done synchronously
|
|
/// And we will execute this ALTER query on each replica of a shard.
|
|
/// It is correct, because this query is idempotent.
|
|
settings_push.replication_alter_partitions_sync = 2;
|
|
|
|
query_alter_ast_string += " ALTER TABLE " + getQuotedTable(original_table) +
|
|
" ATTACH PARTITION " + partition_name +
|
|
" FROM " + getQuotedTable(helping_table);
|
|
|
|
LOG_DEBUG(log, "Executing ALTER query: {}", query_alter_ast_string);
|
|
|
|
try
|
|
{
|
|
size_t num_nodes = executeQueryOnCluster(
|
|
task_table.cluster_push,
|
|
query_alter_ast_string,
|
|
settings_push,
|
|
PoolMode::GET_MANY,
|
|
ClusterExecutionMode::ON_EACH_NODE);
|
|
|
|
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 " + partition_name + " DEDUPLICATE;";
|
|
|
|
LOG_DEBUG(log, "Executing OPTIMIZE DEDUPLICATE query: {}", query_alter_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());
|
|
|
|
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::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::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::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 += " 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::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)
|
|
{
|
|
/// 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;
|
|
TaskStatus 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 occured 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);
|
|
}
|
|
|
|
return table_is_done;
|
|
}
|
|
|
|
/// 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 = context.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 = context.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::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::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::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;
|
|
{
|
|
Context local_context = 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_DEBUG(log, "Destination tables {} have been created on {} shards of {}", getQuotedTable(task_table.table_push), shards, task_table.cluster_push->getShardCount());
|
|
}
|
|
|
|
/// 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 = context.getSettingsRef();
|
|
query_insert_ast = parseQuery(p_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
LOG_DEBUG(log, "Executing INSERT query: {}", query);
|
|
}
|
|
|
|
try
|
|
{
|
|
/// Custom INSERT SELECT implementation
|
|
Context context_select = context;
|
|
context_select.setSettings(task_cluster->settings_pull);
|
|
|
|
Context context_insert = context;
|
|
context_insert.setSettings(task_cluster->settings_push);
|
|
|
|
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::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));
|
|
|
|
|
|
/// Try create original table (if not exists) on each shard
|
|
try
|
|
{
|
|
auto create_query_push_ast = rewriteCreateQueryStorage(task_shard.current_pull_table_create_query,
|
|
task_table.table_push, task_table.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_DEBUG(log, "Destination tables {} have been created on {} shards of {}", getQuotedTable(task_table.table_push), shards, task_table.cluster_push->getShardCount());
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "Error while creating original table. Maybe we are not first.");
|
|
}
|
|
|
|
/// 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, context);
|
|
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, context);
|
|
interpreter.execute();
|
|
}
|
|
|
|
|
|
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)
|
|
{
|
|
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_DEBUG(log, "DROP TABLE query was successfully executed on {} nodes.", toString(num_nodes));
|
|
}
|
|
}
|
|
|
|
|
|
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) + " 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_DEBUG(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)
|
|
{
|
|
String query = "SHOW CREATE TABLE " + getQuotedTable(table);
|
|
Block block = getBlockWithAllStreamData(std::make_shared<RemoteBlockInputStream>(
|
|
connection, query, InterpreterShowCreateQuery::getSampleBlock(), context, settings));
|
|
|
|
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 = context.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());
|
|
context.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 auxilary 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)
|
|
{
|
|
createShardInternalTables(timeouts, task_shard, false);
|
|
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
String query;
|
|
{
|
|
WriteBufferFromOwnString wb;
|
|
wb << "SELECT DISTINCT " << queryToString(task_table.engine_push_partition_key_ast) << " 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 = context.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);
|
|
|
|
Context local_context = context;
|
|
local_context.setSettings(task_cluster->settings_pull);
|
|
Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_ast, local_context)->execute().getInputStream());
|
|
|
|
std::set<String> res;
|
|
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->serializeAsTextQuoted(*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 = context.getSettingsRef();
|
|
ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
Context local_context = 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 = context.getSettingsRef();
|
|
ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
|
|
|
|
Context local_context = 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;
|
|
|
|
/// 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, context);
|
|
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);
|
|
|
|
for (auto & connection : connections)
|
|
{
|
|
if (connection.isNull())
|
|
continue;
|
|
|
|
try
|
|
{
|
|
/// CREATE TABLE and DROP PARTITION queries return empty block
|
|
RemoteBlockInputStream stream{*connection, query, Block{}, context, &shard_settings};
|
|
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;
|
|
}
|
|
|
|
}
|