mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 05:32:52 +00:00
75 lines
3.0 KiB
C++
75 lines
3.0 KiB
C++
#pragma once
|
|
|
|
#include <Databases/DatabasesCommon.h>
|
|
#include <Core/BackgroundSchedulePool.h>
|
|
|
|
#include <Databases/DatabaseOrdinary.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/// All tables in DatabaseAtomic have persistent UUID and store data in
|
|
/// /clickhouse_path/store/xxx/xxxyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy/
|
|
/// where xxxyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy is UUID of the table.
|
|
/// RENAMEs are performed without changing UUID and moving table data.
|
|
/// Tables in Atomic databases can be accessed by UUID through DatabaseCatalog.
|
|
/// On DROP TABLE no data is removed, DatabaseAtomic just marks table as dropped
|
|
/// by moving metadata to /clickhouse_path/metadata_dropped/ and notifies DatabaseCatalog.
|
|
/// Running queries still may use dropped table. Table will be actually removed when it's not in use.
|
|
/// Allows to execute RENAME and DROP without IStorage-level RWLocks
|
|
class DatabaseAtomic : public DatabaseOrdinary
|
|
{
|
|
public:
|
|
|
|
DatabaseAtomic(String name_, String metadata_path_, Context & context_);
|
|
|
|
String getEngineName() const override { return "Atomic"; }
|
|
|
|
void renameTable(
|
|
const Context & context,
|
|
const String & table_name,
|
|
IDatabase & to_database,
|
|
const String & to_table_name,
|
|
bool exchange) override;
|
|
|
|
void dropTable(const Context & context, const String & table_name, bool no_delay) override;
|
|
|
|
void attachTable(const String & name, const StoragePtr & table, const String & relative_table_path) override;
|
|
StoragePtr detachTable(const String & name) override;
|
|
|
|
String getTableDataPath(const String & table_name) const override;
|
|
String getTableDataPath(const ASTCreateQuery & query) const override;
|
|
|
|
void drop(const Context & /*context*/) override;
|
|
|
|
DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
|
|
|
|
void loadStoredObjects(Context & context, bool has_force_restore_data_flag) override;
|
|
|
|
/// Atomic database cannot be detached if there is detached table which still in use
|
|
void assertCanBeDetached(bool cleenup);
|
|
|
|
UUID tryGetTableUUID(const String & table_name) const override;
|
|
|
|
private:
|
|
void commitAlterTable(const StorageID & table_id, const String & table_metadata_tmp_path, const String & table_metadata_path) override;
|
|
void commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
|
|
const String & table_metadata_tmp_path, const String & table_metadata_path) override;
|
|
|
|
void assertDetachedTableNotInUse(const UUID & uuid);
|
|
typedef std::unordered_map<UUID, StoragePtr> DetachedTables;
|
|
[[nodiscard]] DetachedTables cleenupDetachedTables();
|
|
|
|
void tryCreateSymlink(const String & table_name, const String & actual_data_path);
|
|
void tryRemoveSymlink(const String & table_name);
|
|
|
|
//TODO store path in DatabaseWithOwnTables::tables
|
|
typedef std::unordered_map<String, String> NameToPathMap;
|
|
NameToPathMap table_name_to_path;
|
|
|
|
DetachedTables detached_tables;
|
|
const String path_to_table_symlinks;
|
|
};
|
|
|
|
}
|