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condition variable per context instead of one mutex and one conditional variable for the whole subsystem. This should increase concurrency in this subsystem. It also opens the way for further changes which are necessary to solve such bugs as bug #46272 "MySQL 5.4.4, new MDL: unnecessary deadlock" and bug #37346 "innodb does not detect deadlock between update and alter table". Two other notable changes done by this patch: - MDL subsystem no longer implicitly acquires global intention exclusive metadata lock when per-object metadata lock is acquired. Now this has to be done by explicit calls outside of MDL subsystem. - Instead of using separate MDL_context for opening system tables/tables for purposes of I_S we now create MDL savepoint in the main context before opening tables and rollback to this savepoint after closing them. This means that it is now possible to get ER_LOCK_DEADLOCK error even not inside a transaction. This might happen in unlikely case when one runs DDL on one of system tables while also running DDL on some other tables. Cases when this ER_LOCK_DEADLOCK error is not justified will be addressed by advanced deadlock detector for MDL subsystem which we plan to implement. mysql-test/include/handler.inc: Adjusted handler_myisam.test and handler_innodb.test to the fact that exclusive metadata locks on tables are now acquired according to alphabetical order of fully qualified table names instead of order in which tables are mentioned in statement. mysql-test/r/handler_innodb.result: Adjusted handler_myisam.test and handler_innodb.test to the fact that exclusive metadata locks on tables are now acquired according to alphabetical order of fully qualified table names instead of order in which tables are mentioned in statement. mysql-test/r/handler_myisam.result: Adjusted handler_myisam.test and handler_innodb.test to the fact that exclusive metadata locks on tables are now acquired according to alphabetical order of fully qualified table names instead of order in which tables are mentioned in statement. mysql-test/r/mdl_sync.result: Adjusted mdl_sync.test to the fact that exclusive metadata locks on tables are now acquired according to alphabetical order of fully qualified table names instead of order in which tables are mentioned in statement. mysql-test/t/mdl_sync.test: Adjusted mdl_sync.test to the fact that exclusive metadata locks on tables are now acquired according to alphabetical order of fully qualified table names instead of order in which tables are mentioned in statement. sql/events.cc: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. sql/ha_ndbcluster.cc: Since manipulations with open table state no longer install proxy MDL_context it does not make sense to perform them in order to satisfy assert in mysql_rm_tables_part2(). Removed them per agreement with Cluster team. This has not broken test suite since scenario in which deadlock can occur and assertion fails is not covered by tests. sql/lock.cc: MDL subsystem no longer implicitly acquires global intention exclusive metadata lock when per-object exclusive metadata lock is acquired. Now this has to be done by explicit calls outside of MDL subsystem. sql/log.cc: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. sql/mdl.cc: Changed metadata locking subsystem to use mutex per lock and condition variable per context instead of one mutex and one conditional variable for the whole subsystem. Changed approach to handling of global metadata locks. Instead of implicitly acquiring intention exclusive locks when user requests per-object upgradeable or exclusive locks now we require them to be acquired explicitly in the same way as ordinary metadata locks. In fact global lock are now ordinary metadata locks in new GLOBAL namespace. To implement these changes: - Removed LOCK_mdl mutex and COND_mdl condition variable. - Introduced MDL_lock::m_mutex mutexes which protect individual lock objects. - Replaced mdl_locks hash with MDL_map class, which has hash for MDL_lock objects as a member and separate mutex which protects this hash. Methods of this class allow to find(), find_or_create() or remove() MDL_lock objects in concurrency-friendly fashion (i.e. for most common operation, find_or_create(), we don't acquire MDL_lock::m_mutex while holding MDL_map::m_mutex. Thanks to MikaelR for this idea and benchmarks!). Added three auxiliary members to MDL_lock class (m_is_destroyed, m_ref_usage, m_ref_release) to support this concurrency-friendly behavior. - Introduced MDL_context::m_ctx_wakeup_cond condition variable to be used for waiting until this context's pending request can be satisfied or its thread has to perform actions to resolve potential deadlock. Context which want to wait add ticket corresponding to the request to an appropriate queue of waiters in MDL_lock object so they can be noticed when other contexts change state of lock and be awaken by them by signalling on MDL_context::m_ctx_wakeup_cond. As consequence MDL_ticket objects has to be used for any waiting in metadata locking subsystem including one which happens in MDL_context::wait_for_locks() method. Another consequence is that MDL_context is no longer copyable and can't be saved/restored when working with system tables. - Made MDL_lock an abstract class, which delegates specifying exact compatibility matrix to its descendants. Added MDL_global_lock child class for global lock (The old is_lock_type_compatible() method became can_grant_lock() method of this class). Added MDL_object_lock class to represent per-object lock (The old MDL_lock::can_grant_lock() became its method). Choice between two classes happens based on MDL namespace in MDL_lock::create() method. - Got rid of MDL_lock::type member as its meaning became ambigous for global locks. - To simplify waking up of contexts waiting for lock split waiting queue in MDL_lock class in two queues. One for pending requests for exclusive (including intention exclusive) locks and another for requests for shared locks. - Added virtual wake_up_waiters() method to MDL_lock, MDL_global_lock and MDL_object_lock classes which allows to wake up waiting contexts after state of lock changes. Replaced old duplicated code with calls to this method. - Adjusted MDL_context::try_acquire_shared_lock()/exclusive_lock()/ global_shared_lock(), MDL_ticket::upgrade_shared_lock_to_exclusive_lock() and MDL_context::release_ticket() methods to use MDL_map and MDL_lock::m_mutex instead of single LOCK_mdl mutex and wake up waiters according to the approach described above. The latter method also was renamed to MDL_context::release_lock(). - Changed MDL_context::try_acquire_shared_lock()/exclusive_lock() and release_lock() not to handle global locks. They are now supposed to be taken explicitly like ordinary metadata locks. - Added helper MDL_context::try_acquire_global_intention_exclusive_lock() and acquire_global_intention_exclusive_lock() methods. - Moved common code from MDL_context::acquire_global_shared_lock() and acquire_global_intention_exclusive_lock() to new method - MDL_context::acquire_lock_impl(). - Moved common code from MDL_context::try_acquire_shared_lock(), try_acquire_global_intention_exclusive_lock()/exclusive_lock() to MDL_context::try_acquire_lock_impl(). - Since acquiring of several exclusive locks can no longer happen under single LOCK_mdl mutex the approach to it had to be changed. Now we do it in one by one fashion. This is done in alphabetical order to avoid deadlocks. Changed MDL_context::acquire_exclusive_locks() accordingly (as part of this change moved code responsible for acquiring single exclusive lock to new MDL_context::acquire_exclusive_lock_impl() method). - Since we no longer have single LOCK_mdl mutex which protects all MDL_context::m_is_waiting_in_mdl members using these members to determine if we have really awaken context holding conflicting shared lock became inconvinient. Got rid of this member and changed notify_shared_lock() helper function and process of acquiring of/upgrading to exclusive lock not to rely on such information. Now in MDL_context::acquire_exclusive_lock_impl() and MDL_ticket::upgrade_shared_lock_to_exclusive_lock() we simply re-try to wake up threads holding conflicting shared locks after small time out. - Adjusted MDL_context::can_wait_lead_to_deadlock() and MDL_ticket::has_pending_conflicting_lock() to use per-lock mutexes instead of LOCK_mdl. To do this introduced MDL_lock::has_pending_exclusive_lock() method. sql/mdl.h: Changed metadata locking subsystem to use mutex per lock and condition variable per context instead of one mutex and one conditional variable for the whole subsystem. In order to implement this change: - Added MDL_key::cmp() method to be able to sort MDL_key objects alphabetically. Changed length fields in MDL_key class to uint16 as 16-bit is enough for length of any key. - Changed MDL_ticket::get_ctx() to return pointer to non-const object in order to be able to use MDL_context::awake() method for such contexts. - Got rid of unlocked versions of can_wait_lead_to_deadlock()/ has_pending_conflicting_lock() methods in MDL_context and MDL_ticket. We no longer has single mutex which protects all locks. Thus one always has to use versions of these methods which acquire per-lock mutexes. - MDL_request_list type of list now counts its elements. - Added MDL_context::m_ctx_wakeup_cond condition variable to be used for waiting until this context's pending request can be satisfied or its thread has to perform actions to resolve potential deadlock. Added awake() method to wake up context from such wait. Addition of condition variable made MDL_context uncopyable. As result we no longer can save/restore MDL_context when working with system tables. Instead we create MDL savepoint before opening those tables and rollback to it once they are closed. - MDL_context::release_ticket() became release_lock() method. - Added auxiliary MDL_context::acquire_exclusive_lock_impl() method which does all necessary work to acquire exclusive lock on one object but should not be used directly as it does not enforce any asserts ensuring that no deadlocks are possible. - Since we no longer need to know if thread trying to acquire exclusive lock managed to wake up any threads having conflicting shared locks (as, anyway, we will try to wake up such threads again shortly) - MDL_context::m_is_waiting_in_mdl member became unnecessary and notify_shared_lock() no longer needs to be friend of MDL_context. Changed approach to handling of global metadata locks. Instead of implicitly acquiring intention exclusive locks when user requests per-object upgradeable or exclusive locks now we require them to be acquired explicitly in the same way as ordinary metadata locks. - Added new GLOBAL namespace for such locks. - Added new type of lock to be requested MDL_INTENTION_EXCLISIVE. - Added MDL_context::try_acquire_global_intention_exclusive_lock() and acquire_global_intention_exclusive_lock() methods. - Moved common code from MDL_context::acquire_global_shared_lock() and acquire_global_intention_exclusive_lock() to new method - MDL_context::acquire_lock_impl(). - Moved common code from MDL_context::try_acquire_shared_lock(), try_acquire_global_intention_exclusive_lock()/exclusive_lock() to MDL_context::try_acquire_lock_impl(). - Added helper MDL_context::is_global_lock_owner() method to be able easily to find what kind of global lock this context holds. - MDL_context::m_has_global_shared_lock became unnecessary as global read lock is now represented by ordinary ticket. - Removed assert in MDL_context::set_lt_or_ha_sentinel() which became false for cases when we execute LOCK TABLES under global read lock mode. sql/mysql_priv.h: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result calls opening/closing system tables were changed to use Open_tables_backup instead of Open_table_state class as well. sql/sp.cc: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. sql/sp.h: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. sql/sql_base.cc: close_thread_tables(): Since we no longer use separate MDL_context for opening system tables we need to avoid releasing all transaction locks when closing system table. Releasing metadata lock on system table is now responsibility of THD::restore_backup_open_tables_state(). open_table_get_mdl_lock(), Open_table_context::recover_from_failed_open(): MDL subsystem no longer implicitly acquires global intention exclusive metadata lock when per-object upgradable or exclusive metadata lock is acquired. So this have to be done explicitly from these calls. Changed Open_table_context class to store MDL_request object for global intention exclusive lock acquired when opening tables. open_table(): Do not release metadata lock if we have failed to open table as this lock might have been acquired by one of previous statements in transaction, and therefore should not be released. open_system_tables_for_read()/close_system_tables()/ open_performance_schema_table(): Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. close_performance_schema_table(): Got rid of duplicated code. sql/sql_class.cc: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. Also releasing metadata lock on system table is now responsibility of THD::restore_backup_open_tables_state(). Adjusted assert in THD::cleanup() to take into account fact that now we also use MDL sentinel for global read lock. sql/sql_class.h: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. As result: - 'mdl_context' member was moved out of Open_tables_state to THD class. enter_locked_tables_mode()/leave_locked_tables_mode() had to follow. - Methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. Changed Open_table_context class to store MDL_request object for global intention exclusive lock acquired when opening tables. sql/sql_delete.cc: MDL subsystem no longer implicitly acquires global intention exclusive metadata lock when per-object exclusive metadata lock is acquired. Now this has to be done by explicit calls outside of MDL subsystem. sql/sql_help.cc: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. sql/sql_parse.cc: Adjusted assert reload_acl_and_cache() to the fact that global read lock now takes full-blown metadata lock. sql/sql_plist.h: Added support for element counting to I_P_List list template. One can use policy classes to specify if such counting is needed or not needed for particular list. sql/sql_show.cc: Instead of using separate MDL_context for opening tables for I_S purposes we now create MDL savepoint in the main context before opening tables and rollback to this savepoint after closing them. To support this and similar change for system tables methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing tables for I_S purposes was changed to use Open_tables_backup instead of Open_table_state class as well. sql/sql_table.cc: mysql_rm_tables_part2(): Since now global intention exclusive metadata lock is ordinary metadata lock we no longer can rely that by releasing MDL locks on all tables we will release all locks acquired by this routine. So in non-LOCK-TABLES mode we have to release all locks acquired explicitly. prepare_for_repair(), mysql_alter_table(): MDL subsystem no longer implicitly acquires global intention exclusive metadata lock when per-object exclusive metadata lock is acquired. Now this has to be done by explicit calls outside of MDL subsystem. sql/tztime.cc: Instead of using separate MDL_context for opening system tables we now create MDL savepoint in the main context before opening such tables and rollback to this savepoint after closing them. To support this change methods of THD responsible for saving/restoring open table state were changed to use Open_tables_backup class which in addition to Open_table_state has a member for this savepoint. As result code opening/closing system tables was changed to use Open_tables_backup instead of Open_table_state class as well. Also changed code not to use special mechanism for open system tables when it is not really necessary. |
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| add_anonymous_users.inc | ||
| analyze-sync_with_master.test | ||
| analyze-timeout.test | ||
| big_test.inc | ||
| bug38347.inc | ||
| check-testcase.test | ||
| check-warnings.test | ||
| check_events_off.inc | ||
| check_ipv6.inc | ||
| check_var_limit.inc | ||
| circular_rpl_for_4_hosts_init.inc | ||
| circular_rpl_for_4_hosts_sync.inc | ||
| cleanup_fake_relay_log.inc | ||
| commit.inc | ||
| common-tests.inc | ||
| concurrent.inc | ||
| connect2.inc | ||
| count_sessions.inc | ||
| ctype_common.inc | ||
| ctype_filesort.inc | ||
| ctype_german.inc | ||
| ctype_innodb_like.inc | ||
| ctype_like_escape.inc | ||
| ctype_like_range_f1f2.inc | ||
| ctype_regex.inc | ||
| ddl_i18n.check_events.inc | ||
| ddl_i18n.check_sp.inc | ||
| ddl_i18n.check_triggers.inc | ||
| ddl_i18n.check_views.inc | ||
| deadlock.inc | ||
| default_client.cnf | ||
| default_my.cnf | ||
| default_mysqld.cnf | ||
| default_ndbd.cnf | ||
| delete_anonymous_users.inc | ||
| diff_master_slave.inc | ||
| diff_tables.inc | ||
| endspace.inc | ||
| get_binlog_dump_thread_id.inc | ||
| gis_generic.inc | ||
| gis_keys.inc | ||
| grant_cache.inc | ||
| handler.inc | ||
| have_32bit.inc | ||
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| have_big5.inc | ||
| have_binlog_format_mixed.inc | ||
| have_binlog_format_mixed_or_row.inc | ||
| have_binlog_format_mixed_or_statement.inc | ||
| have_binlog_format_row.inc | ||
| have_binlog_format_row_or_statement.inc | ||
| have_binlog_format_statement.inc | ||
| have_blackhole.inc | ||
| have_case_insensitive_file_system.inc | ||
| have_case_insensitive_fs.inc | ||
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| have_geometry.inc | ||
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| have_latin2_ch.inc | ||
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| have_lowercase0.inc | ||
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| have_multi_ndb.inc | ||
| have_mysql_upgrade.inc | ||
| have_ndb.inc | ||
| have_ndb_extra.inc | ||
| have_ndbapi_examples.inc | ||
| have_nodebug.inc | ||
| have_not_innodb_plugin.inc | ||
| have_outfile.inc | ||
| have_partition.inc | ||
| have_profiling.inc | ||
| have_query_cache.inc | ||
| have_semisync_plugin.inc | ||
| have_simple_parser.inc | ||
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| have_ssl.inc | ||
| have_ssl_communication.inc | ||
| have_symlink.inc | ||
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| have_ujis.inc | ||
| have_utf8.inc | ||
| implicit_commit_helper.inc | ||
| index_merge1.inc | ||
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| index_merge_2sweeps.inc | ||
| index_merge_ror.inc | ||
| index_merge_ror_cpk.inc | ||
| innodb_rollback_on_timeout.inc | ||
| innodb_trx_weight.inc | ||
| ipv6.inc | ||
| ipv6_clients.inc | ||
| is_embedded.inc | ||
| kill_query.inc | ||
| kill_query_and_diff_master_slave.inc | ||
| linux_sys_vars.inc | ||
| load_sysvars.inc | ||
| loaddata_autocom.inc | ||
| master-slave-end.inc | ||
| master-slave-reset.inc | ||
| master-slave.inc | ||
| mix1.inc | ||
| mix2.inc | ||
| mix2_ucs2.inc | ||
| mtr_check.sql | ||
| mtr_warnings.sql | ||
| mysqlbinlog_row_engine.inc | ||
| mysqldump.inc | ||
| mysqltest-x.inc | ||
| ndb_backup.inc | ||
| ndb_backup_print.inc | ||
| ndb_default_cluster.inc | ||
| ndb_master-slave.inc | ||
| ndb_master-slave_2ch.inc | ||
| ndb_not_readonly.inc | ||
| ndb_restore_master.inc | ||
| ndb_restore_slave_eoption.inc | ||
| ndb_setup_slave.inc | ||
| ndb_wait_connected.inc | ||
| no_running_event_scheduler.inc | ||
| no_running_events.inc | ||
| no_valgrind_without_big.inc | ||
| not_as_root.inc | ||
| not_embedded.inc | ||
| not_ndb.inc | ||
| not_ndb_default.inc | ||
| not_openssl.inc | ||
| not_valgrind.inc | ||
| not_windows.inc | ||
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| one_thread_per_connection.inc | ||
| parser_bug21114.inc | ||
| partition_date_range.inc | ||
| ps_conv.inc | ||
| ps_create.inc | ||
| ps_ddl_1.inc | ||
| ps_modify.inc | ||
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| ps_query.inc | ||
| ps_renew.inc | ||
| query_cache.inc | ||
| query_cache_sql_prepare.inc | ||
| read_many_rows.inc | ||
| report-features.test | ||
| reset_master_and_slave.inc | ||
| restart_mysqld.inc | ||
| rowid_order.inc | ||
| rpl_events.inc | ||
| rpl_ip_mix.inc | ||
| rpl_ip_mix2.inc | ||
| rpl_ipv6.inc | ||
| rpl_loaddata_charset.inc | ||
| rpl_multi_engine.inc | ||
| rpl_multi_engine2.inc | ||
| rpl_multi_engine3.inc | ||
| rpl_stmt_seq.inc | ||
| rpl_udf.inc | ||
| running_event_scheduler.inc | ||
| safe_set_to_maybe_ro_var.inc | ||
| select_ndb_apply_status.inc | ||
| set_binlog_format_mixed.sql | ||
| set_binlog_format_row.sql | ||
| set_binlog_format_statement.sql | ||
| setup_fake_relay_log.inc | ||
| show_binary_logs.inc | ||
| show_binlog_events.inc | ||
| show_binlog_events2.inc | ||
| show_binlog_using_logname.inc | ||
| show_master_logs.inc | ||
| show_master_status.inc | ||
| show_msg.inc | ||
| show_msg80.inc | ||
| show_relaylog_events.inc | ||
| show_rpl_debug_info.inc | ||
| show_slave_status.inc | ||
| show_slave_status2.inc | ||
| sp-vars.inc | ||
| start_slave.inc | ||
| stop_slave.inc | ||
| strict_autoinc.inc | ||
| sync_slave_io_with_master.inc | ||
| system_db_struct.inc | ||
| test_fieldsize.inc | ||
| test_outfile.inc | ||
| testdb_only.inc | ||
| tpcb.inc | ||
| tpcb_disk_data.inc | ||
| unsafe_binlog.inc | ||
| uses_vardir.inc | ||
| varchar.inc | ||
| wait_condition.inc | ||
| wait_condition_sp.inc | ||
| wait_for_binlog_event.inc | ||
| wait_for_ndb_to_binlog.inc | ||
| wait_for_query_to_succeed.inc | ||
| wait_for_slave_io_error.inc | ||
| wait_for_slave_io_to_start.inc | ||
| wait_for_slave_io_to_stop.inc | ||
| wait_for_slave_param.inc | ||
| wait_for_slave_sql_error.inc | ||
| wait_for_slave_sql_error_and_skip.inc | ||
| wait_for_slave_sql_to_start.inc | ||
| wait_for_slave_sql_to_stop.inc | ||
| wait_for_slave_to_start.inc | ||
| wait_for_slave_to_stop.inc | ||
| wait_for_status_var.inc | ||
| wait_show_condition.inc | ||
| wait_until_connected_again.inc | ||
| wait_until_count_sessions.inc | ||
| wait_until_disconnected.inc | ||
| wait_until_rows_count.inc | ||
| windows.inc | ||
| windows_sys_vars.inc | ||