mirror of
https://github.com/ClickHouse/ClickHouse.git
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87 lines
3.7 KiB
C++
87 lines
3.7 KiB
C++
#pragma once
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#include <Databases/DatabasesCommon.h>
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#include <Core/BackgroundSchedulePool.h>
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#include <Databases/DatabaseOrdinary.h>
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namespace DB
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{
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/// All tables in DatabaseAtomic have persistent UUID and store data in
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/// /clickhouse_path/store/xxx/xxxyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy/
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/// where xxxyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy is UUID of the table.
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/// RENAMEs are performed without changing UUID and moving table data.
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/// Tables in Atomic databases can be accessed by UUID through DatabaseCatalog.
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/// On DROP TABLE no data is removed, DatabaseAtomic just marks table as dropped
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/// by moving metadata to /clickhouse_path/metadata_dropped/ and notifies DatabaseCatalog.
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/// Running queries still may use dropped table. Table will be actually removed when it's not in use.
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/// Allows to execute RENAME and DROP without IStorage-level RWLocks
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class DatabaseAtomic : public DatabaseOrdinary
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{
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public:
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DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const Context & context_);
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DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const String & logger, const Context & context_);
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String getEngineName() const override { return "Atomic"; }
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UUID getUUID() const override { return db_uuid; }
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void renameDatabase(const String & new_name) override;
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void renameTable(
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const Context & context,
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const String & table_name,
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IDatabase & to_database,
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const String & to_table_name,
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bool exchange,
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bool dictionary) override;
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void dropTable(const Context & context, const String & table_name, bool no_delay) override;
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void attachTable(const String & name, const StoragePtr & table, const String & relative_table_path) override;
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StoragePtr detachTable(const String & name) override;
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String getTableDataPath(const String & table_name) const override;
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String getTableDataPath(const ASTCreateQuery & query) const override;
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void drop(const Context & /*context*/) override;
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DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
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void loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach) override;
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/// Atomic database cannot be detached if there is detached table which still in use
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void assertCanBeDetached(bool cleanup);
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UUID tryGetTableUUID(const String & table_name) const override;
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void tryCreateSymlink(const String & table_name, const String & actual_data_path, bool if_data_path_exist = false);
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void tryRemoveSymlink(const String & table_name);
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void waitDetachedTableNotInUse(const UUID & uuid);
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protected:
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void commitAlterTable(const StorageID & table_id, const String & table_metadata_tmp_path, const String & table_metadata_path, const String & statement, const Context & query_context) override;
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void commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
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const String & table_metadata_tmp_path, const String & table_metadata_path, const Context & query_context) override;
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void assertDetachedTableNotInUse(const UUID & uuid);
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typedef std::unordered_map<UUID, StoragePtr> DetachedTables;
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[[nodiscard]] DetachedTables cleanupDetachedTables();
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void tryCreateMetadataSymlink();
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void renameDictionaryInMemoryUnlocked(const StorageID & old_name, const StorageID & new_name);
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//TODO store path in DatabaseWithOwnTables::tables
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typedef std::unordered_map<String, String> NameToPathMap;
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NameToPathMap table_name_to_path;
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DetachedTables detached_tables;
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String path_to_table_symlinks;
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String path_to_metadata_symlink;
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const UUID db_uuid;
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};
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}
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