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https://github.com/ClickHouse/ClickHouse.git
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342 lines
15 KiB
C++
342 lines
15 KiB
C++
#pragma once
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#include <Core/UUID.h>
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#include <Interpreters/Context_fwd.h>
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#include <Interpreters/StorageID.h>
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#include <Databases/TablesLoader.h>
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#include <Parsers/IAST_fwd.h>
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#include <Storages/IStorage_fwd.h>
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#include <boost/noncopyable.hpp>
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#include <Poco/Logger.h>
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#include <array>
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#include <condition_variable>
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#include <list>
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#include <map>
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#include <memory>
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#include <mutex>
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#include <set>
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#include <shared_mutex>
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#include <unordered_map>
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#include <unordered_set>
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#include <filesystem>
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namespace fs = std::filesystem;
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namespace DB
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{
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class IDatabase;
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class Exception;
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class ColumnsDescription;
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struct ConstraintsDescription;
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class IDisk;
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using DatabasePtr = std::shared_ptr<IDatabase>;
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using DatabaseAndTable = std::pair<DatabasePtr, StoragePtr>;
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using Databases = std::map<String, std::shared_ptr<IDatabase>>;
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using DiskPtr = std::shared_ptr<IDisk>;
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/// Table -> set of table-views that make SELECT from it.
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using ViewDependencies = std::map<StorageID, std::set<StorageID>>;
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using Dependencies = std::vector<StorageID>;
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/// Allows executing DDL query only in one thread.
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/// Puts an element into the map, locks tables's mutex, counts how much threads run parallel query on the table,
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/// when counter is 0 erases element in the destructor.
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/// If the element already exists in the map, waits when ddl query will be finished in other thread.
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class DDLGuard
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{
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public:
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struct Entry
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{
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std::unique_ptr<std::mutex> mutex;
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UInt32 counter;
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};
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/// Element name -> (mutex, counter).
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/// NOTE: using std::map here (and not std::unordered_map) to avoid iterator invalidation on insertion.
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using Map = std::map<String, Entry>;
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DDLGuard(
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Map & map_,
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std::shared_mutex & db_mutex_,
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std::unique_lock<std::mutex> guards_lock_,
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const String & elem,
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const String & database_name);
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~DDLGuard();
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/// Unlocks table name, keeps holding read lock for database name
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void releaseTableLock() noexcept;
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private:
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Map & map;
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std::shared_mutex & db_mutex;
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Map::iterator it;
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std::unique_lock<std::mutex> guards_lock;
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std::unique_lock<std::mutex> table_lock;
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bool table_lock_removed = false;
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bool is_database_guard = false;
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};
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using DDLGuardPtr = std::unique_ptr<DDLGuard>;
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/// Creates temporary table in `_temporary_and_external_tables` with randomly generated unique StorageID.
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/// Such table can be accessed from everywhere by its ID.
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/// Removes the table from database on destruction.
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/// TemporaryTableHolder object can be attached to a query or session Context, so table will be accessible through the context.
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struct TemporaryTableHolder : boost::noncopyable, WithContext
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{
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using Creator = std::function<StoragePtr (const StorageID &)>;
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TemporaryTableHolder(ContextPtr context, const Creator & creator, const ASTPtr & query = {});
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/// Creates temporary table with Engine=Memory
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TemporaryTableHolder(
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ContextPtr context,
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const ColumnsDescription & columns,
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const ConstraintsDescription & constraints,
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const ASTPtr & query = {},
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bool create_for_global_subquery = false);
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TemporaryTableHolder(TemporaryTableHolder && rhs) noexcept;
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TemporaryTableHolder & operator=(TemporaryTableHolder && rhs) noexcept;
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~TemporaryTableHolder();
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StorageID getGlobalTableID() const;
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StoragePtr getTable() const;
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operator bool () const { return id != UUIDHelpers::Nil; } /// NOLINT
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IDatabase * temporary_tables = nullptr;
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UUID id = UUIDHelpers::Nil;
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};
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///TODO maybe remove shared_ptr from here?
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using TemporaryTablesMapping = std::map<String, std::shared_ptr<TemporaryTableHolder>>;
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class BackgroundSchedulePoolTaskHolder;
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/// For some reason Context is required to get Storage from Database object
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class DatabaseCatalog : boost::noncopyable, WithMutableContext
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{
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public:
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/// Names of predefined databases.
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static constexpr const char * TEMPORARY_DATABASE = "_temporary_and_external_tables";
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static constexpr const char * SYSTEM_DATABASE = "system";
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static constexpr const char * INFORMATION_SCHEMA = "information_schema";
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static constexpr const char * INFORMATION_SCHEMA_UPPERCASE = "INFORMATION_SCHEMA";
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/// Returns true if a passed name is one of the predefined databases' names.
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static bool isPredefinedDatabase(std::string_view database_name);
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static DatabaseCatalog & init(ContextMutablePtr global_context_);
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static DatabaseCatalog & instance();
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static void shutdown();
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void initializeAndLoadTemporaryDatabase();
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void loadDatabases();
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void loadMarkedAsDroppedTables();
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/// Get an object that protects the table from concurrently executing multiple DDL operations.
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DDLGuardPtr getDDLGuard(const String & database, const String & table);
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/// Get an object that protects the database from concurrent DDL queries all tables in the database
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std::unique_lock<std::shared_mutex> getExclusiveDDLGuardForDatabase(const String & database);
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void assertDatabaseExists(const String & database_name) const;
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void assertDatabaseDoesntExist(const String & database_name) const;
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DatabasePtr getDatabaseForTemporaryTables() const;
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DatabasePtr getSystemDatabase() const;
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void attachDatabase(const String & database_name, const DatabasePtr & database);
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DatabasePtr detachDatabase(ContextPtr local_context, const String & database_name, bool drop = false, bool check_empty = true);
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void updateDatabaseName(const String & old_name, const String & new_name, const Strings & tables_in_database);
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/// database_name must be not empty
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DatabasePtr getDatabase(const String & database_name) const;
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DatabasePtr tryGetDatabase(const String & database_name) const;
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DatabasePtr getDatabase(const UUID & uuid) const;
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DatabasePtr tryGetDatabase(const UUID & uuid) const;
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bool isDatabaseExist(const String & database_name) const;
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Databases getDatabases() const;
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/// Same as getDatabase(const String & database_name), but if database_name is empty, current database of local_context is used
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DatabasePtr getDatabase(const String & database_name, ContextPtr local_context) const;
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/// For all of the following methods database_name in table_id must be not empty (even for temporary tables).
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void assertTableDoesntExist(const StorageID & table_id, ContextPtr context) const;
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bool isTableExist(const StorageID & table_id, ContextPtr context) const;
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bool isDictionaryExist(const StorageID & table_id) const;
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StoragePtr getTable(const StorageID & table_id, ContextPtr context) const;
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StoragePtr tryGetTable(const StorageID & table_id, ContextPtr context) const;
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DatabaseAndTable getDatabaseAndTable(const StorageID & table_id, ContextPtr context) const;
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DatabaseAndTable tryGetDatabaseAndTable(const StorageID & table_id, ContextPtr context) const;
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DatabaseAndTable getTableImpl(const StorageID & table_id,
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ContextPtr context,
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std::optional<Exception> * exception = nullptr) const;
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/// Returns true if a passed table_id refers to one of the predefined tables' names.
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/// All tables in the "system" database with System* table engine are predefined.
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/// Four views (tables, views, columns, schemata) in the "information_schema" database are predefined too.
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bool isPredefinedTable(const StorageID & table_id) const;
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void addDependency(const StorageID & from, const StorageID & where);
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void removeDependency(const StorageID & from, const StorageID & where);
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Dependencies getDependencies(const StorageID & from) const;
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/// For Materialized and Live View
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void updateDependency(const StorageID & old_from, const StorageID & old_where,const StorageID & new_from, const StorageID & new_where);
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/// If table has UUID, addUUIDMapping(...) must be called when table attached to some database
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/// removeUUIDMapping(...) must be called when it detached,
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/// and removeUUIDMappingFinally(...) must be called when table is dropped and its data removed from disk.
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/// Such tables can be accessed by persistent UUID instead of database and table name.
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void addUUIDMapping(const UUID & uuid, const DatabasePtr & database, const StoragePtr & table);
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void removeUUIDMapping(const UUID & uuid);
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void removeUUIDMappingFinally(const UUID & uuid);
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/// For moving table between databases
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void updateUUIDMapping(const UUID & uuid, DatabasePtr database, StoragePtr table);
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/// This method adds empty mapping (with database and storage equal to nullptr).
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/// It's required to "lock" some UUIDs and protect us from collision.
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/// Collisions of random 122-bit integers are very unlikely to happen,
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/// but we allow to explicitly specify UUID in CREATE query (in particular for testing).
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/// If some UUID was already added and we are trying to add it again,
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/// this method will throw an exception.
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void addUUIDMapping(const UUID & uuid);
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bool hasUUIDMapping(const UUID & uuid);
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static String getPathForUUID(const UUID & uuid);
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DatabaseAndTable tryGetByUUID(const UUID & uuid) const;
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String getPathForDroppedMetadata(const StorageID & table_id) const;
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void enqueueDroppedTableCleanup(StorageID table_id, StoragePtr table, String dropped_metadata_path, bool ignore_delay = false);
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void waitTableFinallyDropped(const UUID & uuid);
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void addLoadingDependencies(const QualifiedTableName & table, TableNamesSet && dependencies);
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void addLoadingDependencies(const DependenciesInfos & new_infos);
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DependenciesInfo getLoadingDependenciesInfo(const StorageID & table_id) const;
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TableNamesSet tryRemoveLoadingDependencies(const StorageID & table_id, bool check_dependencies, bool is_drop_database = false);
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TableNamesSet tryRemoveLoadingDependenciesUnlocked(const QualifiedTableName & removing_table, bool check_dependencies, bool is_drop_database = false) TSA_REQUIRES(databases_mutex);
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void checkTableCanBeRemovedOrRenamed(const StorageID & table_id) const;
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void updateLoadingDependencies(const StorageID & table_id, TableNamesSet && new_dependencies);
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private:
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// The global instance of database catalog. unique_ptr is to allow
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// deferred initialization. Thought I'd use std::optional, but I can't
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// make emplace(global_context_) compile with private constructor ¯\_(ツ)_/¯.
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static std::unique_ptr<DatabaseCatalog> database_catalog;
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explicit DatabaseCatalog(ContextMutablePtr global_context_);
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void assertDatabaseExistsUnlocked(const String & database_name) const TSA_REQUIRES(databases_mutex);
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void assertDatabaseDoesntExistUnlocked(const String & database_name) const TSA_REQUIRES(databases_mutex);
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void shutdownImpl();
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struct UUIDToStorageMapPart
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{
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std::unordered_map<UUID, DatabaseAndTable> map TSA_GUARDED_BY(mutex);
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mutable std::mutex mutex;
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};
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static constexpr UInt64 bits_for_first_level = 4;
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using UUIDToStorageMap = std::array<UUIDToStorageMapPart, 1ull << bits_for_first_level>;
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static inline size_t getFirstLevelIdx(const UUID & uuid)
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{
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return uuid.toUnderType().items[0] >> (64 - bits_for_first_level);
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}
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struct TableMarkedAsDropped
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{
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StorageID table_id = StorageID::createEmpty();
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StoragePtr table;
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String metadata_path;
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time_t drop_time{};
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};
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using TablesMarkedAsDropped = std::list<TableMarkedAsDropped>;
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void dropTableDataTask();
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void dropTableFinally(const TableMarkedAsDropped & table);
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void cleanupStoreDirectoryTask();
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bool maybeRemoveDirectory(const String & disk_name, const DiskPtr & disk, const String & unused_dir);
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static constexpr size_t reschedule_time_ms = 100;
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static constexpr time_t drop_error_cooldown_sec = 5;
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mutable std::mutex databases_mutex;
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ViewDependencies view_dependencies TSA_GUARDED_BY(databases_mutex);
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Databases databases TSA_GUARDED_BY(databases_mutex);
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UUIDToStorageMap uuid_map;
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DependenciesInfos loading_dependencies TSA_GUARDED_BY(databases_mutex);
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Poco::Logger * log;
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/// Do not allow simultaneous execution of DDL requests on the same table.
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/// database name -> database guard -> (table name mutex, counter),
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/// counter: how many threads are running a query on the table at the same time
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/// For the duration of the operation, an element is placed here, and an object is returned,
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/// which deletes the element in the destructor when counter becomes zero.
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/// In case the element already exists, waits when query will be executed in other thread. See class DDLGuard below.
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using DatabaseGuard = std::pair<DDLGuard::Map, std::shared_mutex>;
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using DDLGuards = std::map<String, DatabaseGuard>;
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DDLGuards ddl_guards TSA_GUARDED_BY(ddl_guards_mutex);
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/// If you capture mutex and ddl_guards_mutex, then you need to grab them strictly in this order.
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mutable std::mutex ddl_guards_mutex;
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TablesMarkedAsDropped tables_marked_dropped TSA_GUARDED_BY(tables_marked_dropped_mutex);
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std::unordered_set<UUID> tables_marked_dropped_ids TSA_GUARDED_BY(tables_marked_dropped_mutex);
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mutable std::mutex tables_marked_dropped_mutex;
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std::unique_ptr<BackgroundSchedulePoolTaskHolder> drop_task;
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static constexpr time_t default_drop_delay_sec = 8 * 60;
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time_t drop_delay_sec = default_drop_delay_sec;
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std::condition_variable wait_table_finally_dropped;
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std::unique_ptr<BackgroundSchedulePoolTaskHolder> cleanup_task;
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static constexpr time_t default_unused_dir_hide_timeout_sec = 60 * 60; /// 1 hour
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time_t unused_dir_hide_timeout_sec = default_unused_dir_hide_timeout_sec;
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static constexpr time_t default_unused_dir_rm_timeout_sec = 30 * 24 * 60 * 60; /// 30 days
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time_t unused_dir_rm_timeout_sec = default_unused_dir_rm_timeout_sec;
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static constexpr time_t default_unused_dir_cleanup_period_sec = 24 * 60 * 60; /// 1 day
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time_t unused_dir_cleanup_period_sec = default_unused_dir_cleanup_period_sec;
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};
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/// This class is useful when creating a table or database.
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/// Usually we create IStorage/IDatabase object first and then add it to IDatabase/DatabaseCatalog.
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/// But such object may start using a directory in store/ since its creation.
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/// To avoid race with cleanupStoreDirectoryTask() we have to mark UUID as used first.
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/// Then we can either add DatabasePtr/StoragePtr to the created UUID mapping
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/// or remove the lock if creation failed.
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/// See also addUUIDMapping(...)
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class TemporaryLockForUUIDDirectory : private boost::noncopyable
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{
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UUID uuid = UUIDHelpers::Nil;
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public:
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TemporaryLockForUUIDDirectory() = default;
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TemporaryLockForUUIDDirectory(UUID uuid_);
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~TemporaryLockForUUIDDirectory();
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TemporaryLockForUUIDDirectory(TemporaryLockForUUIDDirectory && rhs) noexcept;
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TemporaryLockForUUIDDirectory & operator = (TemporaryLockForUUIDDirectory && rhs) noexcept;
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};
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}
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