ClickHouse/dbms/Storages/StorageMergeTree.h
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

171 lines
6.4 KiB
C++

#pragma once
#include <ext/shared_ptr_helper.h>
#include <Core/Names.h>
#include <Storages/AlterCommands.h>
#include <Storages/IStorage.h>
#include <Storages/MergeTree/MergeTreeData.h>
#include <Storages/MergeTree/MergeTreeDataSelectExecutor.h>
#include <Storages/MergeTree/MergeTreeDataWriter.h>
#include <Storages/MergeTree/MergeTreeDataMergerMutator.h>
#include <Storages/MergeTree/MergeTreePartsMover.h>
#include <Storages/MergeTree/MergeTreeMutationEntry.h>
#include <Storages/MergeTree/MergeTreeMutationStatus.h>
#include <Disks/DiskSpaceMonitor.h>
#include <Storages/MergeTree/BackgroundProcessingPool.h>
#include <Common/SimpleIncrement.h>
#include <Core/BackgroundSchedulePool.h>
namespace DB
{
/** See the description of the data structure in MergeTreeData.
*/
class StorageMergeTree final : public ext::shared_ptr_helper<StorageMergeTree>, public MergeTreeData
{
friend struct ext::shared_ptr_helper<StorageMergeTree>;
public:
void startup() override;
void shutdown() override;
~StorageMergeTree() override;
std::string getName() const override { return merging_params.getModeName() + "MergeTree"; }
bool supportsParallelInsert() const override { return true; }
bool supportsIndexForIn() const override { return true; }
Pipes read(
const Names & column_names,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
unsigned num_streams) override;
std::optional<UInt64> totalRows() const override;
std::optional<UInt64> totalBytes() const override;
BlockOutputStreamPtr write(const ASTPtr & query, const Context & context) override;
/** Perform the next step in combining the parts.
*/
bool optimize(const ASTPtr & query, const ASTPtr & partition, bool final, bool deduplicate, const Context & context) override;
void alterPartition(const ASTPtr & query, const PartitionCommands & commands, const Context & context) override;
void mutate(const MutationCommands & commands, const Context & context) override;
/// Return introspection information about currently processing or recently processed mutations.
std::vector<MergeTreeMutationStatus> getMutationsStatus() const override;
CancellationCode killMutation(const String & mutation_id) override;
void drop(TableStructureWriteLockHolder &) override;
void truncate(const ASTPtr &, const Context &, TableStructureWriteLockHolder &) override;
void alter(const AlterCommands & commands, const Context & context, TableStructureWriteLockHolder & table_lock_holder) override;
void checkTableCanBeDropped() const override;
void checkPartitionCanBeDropped(const ASTPtr & partition) override;
ActionLock getActionLock(StorageActionBlockType action_type) override;
CheckResults checkData(const ASTPtr & query, const Context & context) override;
private:
/// Mutex and condvar for synchronous mutations wait
std::mutex mutation_wait_mutex;
std::condition_variable mutation_wait_event;
MergeTreeDataSelectExecutor reader;
MergeTreeDataWriter writer;
MergeTreeDataMergerMutator merger_mutator;
/// For block numbers.
SimpleIncrement increment{0};
/// For clearOldParts, clearOldTemporaryDirectories.
AtomicStopwatch time_after_previous_cleanup;
/// Mutex for parts currently processing in background
/// merging (also with TTL), mutating or moving.
mutable std::mutex currently_processing_in_background_mutex;
/// Parts that currently participate in merge or mutation.
/// This set have to be used with `currently_processing_in_background_mutex`.
DataParts currently_merging_mutating_parts;
std::map<String, MergeTreeMutationEntry> current_mutations_by_id;
std::multimap<Int64, MergeTreeMutationEntry &> current_mutations_by_version;
std::atomic<bool> shutdown_called {false};
/// Task handler for merges, mutations and moves.
BackgroundProcessingPool::TaskHandle merging_mutating_task_handle;
BackgroundProcessingPool::TaskHandle moving_task_handle;
void loadMutations();
/** Determines what parts should be merged and merges it.
* If aggressive - when selects parts don't takes into account their ratio size and novelty (used for OPTIMIZE query).
* Returns true if merge is finished successfully.
*/
bool merge(bool aggressive, const String & partition_id, bool final, bool deduplicate, String * out_disable_reason = nullptr);
BackgroundProcessingPoolTaskResult movePartsTask();
void mutateImpl(const MutationCommands & commands, size_t mutations_sync);
/// Try and find a single part to mutate and mutate it. If some part was successfully mutated, return true.
bool tryMutatePart();
BackgroundProcessingPoolTaskResult mergeMutateTask();
Int64 getCurrentMutationVersion(
const DataPartPtr & part,
std::lock_guard<std::mutex> & /* currently_processing_in_background_mutex_lock */) const;
void clearOldMutations(bool truncate = false);
// Partition helpers
void dropPartition(const ASTPtr & partition, bool detach, const Context & context);
void attachPartition(const ASTPtr & partition, bool part, const Context & context);
void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, const Context & context);
void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, const Context & context);
bool partIsAssignedToBackgroundOperation(const DataPartPtr & part) const override;
/// Just checks versions of each active data part
bool isMutationDone(Int64 mutation_version) const;
friend class MergeTreeBlockOutputStream;
friend class MergeTreeData;
friend struct CurrentlyMergingPartsTagger;
protected:
/** Attach the table with the appropriate name, along the appropriate path (with / at the end),
* (correctness of names and paths are not checked)
* consisting of the specified columns.
*
* See MergeTreeData constructor for comments on parameters.
*/
StorageMergeTree(
const StorageID & table_id_,
const String & relative_data_path_,
const StorageInMemoryMetadata & metadata,
bool attach,
Context & context_,
const String & date_column_name,
const MergingParams & merging_params_,
std::unique_ptr<MergeTreeSettings> settings_,
bool has_force_restore_data_flag);
};
}