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110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
#pragma once
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#include <map>
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#include <shared_mutex>
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#include <base/shared_ptr_helper.h>
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#include <Core/Defines.h>
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#include <Storages/IStorage.h>
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#include <Formats/IndexForNativeFormat.h>
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#include <Common/FileChecker.h>
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#include <Common/escapeForFileName.h>
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#include <Disks/IDisk.h>
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namespace DB
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{
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struct IndexForNativeFormat;
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/** Implements a table engine that is suitable for small chunks of the log.
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* In doing so, stores all the columns in a single Native file, with a nearby index.
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*/
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class StorageStripeLog final : public shared_ptr_helper<StorageStripeLog>, public IStorage
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{
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friend class StripeLogSource;
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friend class StripeLogSink;
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friend class StripeLogRestoreTask;
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friend struct shared_ptr_helper<StorageStripeLog>;
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public:
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~StorageStripeLog() override;
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String getName() const override { return "StripeLog"; }
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Pipe read(
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const Names & column_names,
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const StorageSnapshotPtr & storage_snapshot,
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SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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unsigned num_streams) override;
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SinkToStoragePtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
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void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
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CheckResults checkData(const ASTPtr & /* query */, ContextPtr /* context */) override;
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bool storesDataOnDisk() const override { return true; }
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Strings getDataPaths() const override { return {DB::fullPath(disk, table_path)}; }
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void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder&) override;
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bool hasDataToBackup() const override { return true; }
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BackupEntries backupData(ContextPtr context, const ASTs & partitions) override;
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RestoreTaskPtr restoreData(ContextMutablePtr context, const ASTs & partitions, const BackupPtr & backup, const String & data_path_in_backup, const StorageRestoreSettings & restore_settings, const std::shared_ptr<IRestoreCoordination> & restore_coordination) override;
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std::optional<UInt64> totalRows(const Settings & settings) const override;
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std::optional<UInt64> totalBytes(const Settings & settings) const override;
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protected:
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StorageStripeLog(
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DiskPtr disk_,
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const String & relative_path_,
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const StorageID & table_id_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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const String & comment,
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bool attach,
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size_t max_compress_block_size_);
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private:
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using ReadLock = std::shared_lock<std::shared_timed_mutex>;
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using WriteLock = std::unique_lock<std::shared_timed_mutex>;
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/// Reads the index file if it hasn't read yet.
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/// It is done lazily, so that with a large number of tables, the server starts quickly.
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void loadIndices(std::chrono::seconds lock_timeout) const;
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void loadIndices(const WriteLock &) const;
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/// Saves the index file.
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void saveIndices(const WriteLock &);
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/// Removes all unsaved indices.
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void removeUnsavedIndices(const WriteLock &);
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/// Saves the sizes of the data and index files.
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void saveFileSizes(const WriteLock &);
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const DiskPtr disk;
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String table_path;
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String data_file_path;
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String index_file_path;
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FileChecker file_checker;
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mutable IndexForNativeFormat indices;
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mutable std::atomic<bool> indices_loaded = false;
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mutable size_t num_indices_saved = 0;
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const size_t max_compress_block_size;
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mutable std::shared_timed_mutex rwlock;
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Poco::Logger * log;
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};
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}
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