1641 Commits

Author	SHA1	Message	Date
unknown	e5099a2c85	merge 5.1->5.2	2010-02-01 08:14:12 +02:00
Alexander Nozdrin	d03ebe4b79	Manual merge from mysql-trunk-merge. ... Conflicts: - sql/events.cc - sql/mysql_priv.h - sql/repl_failsafe.cc - sql/sql_db.cc - sql/sql_parse.cc - sql/sql_show.cc	2010-01-30 22:24:33 +03:00
Sergey Glukhov	4a10f7b46c	Bug#49501 Inefficient information_schema check (system collation), addon ... removed wrongly introduced strlen calls sql/events.cc: removed wrongly introduced strlen calls sql/mysql_priv.h: removed wrongly introduced strlen calls sql/repl_failsafe.cc: removed wrongly introduced strlen calls sql/sql_db.cc: removed wrongly introduced strlen calls sql/sql_parse.cc: removed wrongly introduced strlen calls sql/sql_show.cc: removed wrongly introduced strlen calls	2010-01-22 14:58:21 +04:00
Dmitry Lenev	6ddd01c27a	Patch that changes 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. 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.	2010-01-21 23:43:03 +03:00
Georgi Kodinov	679de2bb5e	Bug #50276: Security flaw in INFORMATION_SCHEMA.TABLES ... check_access() returning false for a database does not guarantee that the access is granted to it. This wrong condition in filling the INFORMATION_SCHEMA tables causes extra tables to be returned to the user even if he has no rights to see them. Fixed by correcting the condition.	2010-01-21 17:14:10 +02:00
Alexander Nozdrin	08bcd2d8f6	Auto-merge from mysql-next-mr.	2010-01-21 12:14:34 +03:00
Sergey Petrunya	b83cb52e9e	Backport of subquery optimizations to 5.3. ... There are still test failures because of: - Wrong query results in outer join + semi join - EXPLAIN output differences	2010-01-17 17:51:10 +03:00
Michael Widenius	d8ecbbe634	Merge with MySQL 5.1.42 ... - Marked a couple of tests with --big - Fixed xtradb/handler/ha_innodb.cc to call explain_filename() storage/xtradb/handler/ha_innodb.cc: Call explain_filename() to get proper names for partitioned tables	2010-01-15 17:27:55 +02:00
Sergey Glukhov	5a4a98af14	backported: ... -WL#2822 INFORMATION_SCHEMA.ROUTINES: Add missing columns -WL#2003 INFORMATION_SCHEMA: PARAMETERS view -addon for 'I_S optimization' WL	2010-01-15 15:42:15 +04:00
Marc Alff	e0e0f9e3d4	WL#2360 Performance schema ... Part V: performance schema implementation	2010-01-11 18:47:27 -07:00
Marc Alff	3d91522561	WL#2360 Performance schema ... Part IV: sql instrumentation	2010-01-06 22:42:07 -07:00
Dmitry Lenev	0228c98936	Implementation of simple deadlock detection for metadata locks. ... This change is supposed to reduce number of ER_LOCK_DEADLOCK errors which occur when multi-statement transaction encounters conflicting metadata lock in cases when waiting is possible. The idea is not to fail ER_LOCK_DEADLOCK error immediately when we encounter conflicting metadata lock. Instead we release all metadata locks acquired by current statement and start to wait until conflicting lock go away. To avoid deadlocks we use simple empiric which aborts waiting with ER_LOCK_DEADLOCK error if it turns out that somebody is waiting for metadata locks owned by this transaction. This patch also fixes bug #46273 "MySQL 5.4.4 new MDL: Bug#989 is not fully fixed in case of ALTER". The bug was that concurrent execution of UPDATE or MULTI-UPDATE statement as a part of multi-statement transaction that already has used table being updated and ALTER TABLE statement might have resulted of loss of isolation between this transaction and ALTER TABLE statement, which manifested itself as changes performed by ALTER TABLE becoming visible in transaction and wrong binary log order as a consequence. This problem occurred when UPDATE or MULTI-UPDATE's wait in mysql_lock_tables() call was aborted due to metadata lock upgrade performed by concurrent ALTER TABLE. After such abort all metadata locks held by transaction were released but transaction silently continued to be executed as if nothing has happened. We solve this problem by changing our code not to release all locks in such case. Instead we release only locks which were acquired by current statement and then try to reacquire them by restarting open/lock tables process. We piggyback on simple deadlock detector implementation since this change has to be done anyway for it. mysql-test/include/handler.inc: After introduction of basic deadlock detector for metadata locks it became necessary to change parts of test for HANDLER statements which covered some of scenarios in which ER_LOCK_DEADLOCK error was detected in absence of real deadlock (with new deadlock detector this no longer happens). Also adjusted test to the fact that HANDLER READ for the table no longer will be blocked by ALTER TABLE for the same table which awaits for metadata lock upgrade (this is due to removal of mysql_lock_abort() from wait_while_table_is_used()). mysql-test/r/handler_innodb.result: After introduction of basic deadlock detector for metadata locks it became necessary to change parts of test for HANDLER statements which covered some of scenarios in which ER_LOCK_DEADLOCK error was detected in absence of real deadlock (with new deadlock detector this no longer happens). Also adjusted test to the fact that HANDLER READ for the table no longer will be blocked by ALTER TABLE for the same table which awaits for metadata lock upgrade (this is due to removal of mysql_lock_abort() from wait_while_table_is_used()). mysql-test/r/handler_myisam.result: After introduction of basic deadlock detector for metadata locks it became necessary to change parts of test for HANDLER statements which covered some of scenarios in which ER_LOCK_DEADLOCK error was detected in absence of real deadlock (with new deadlock detector this no longer happens). Also adjusted test to the fact that HANDLER READ for the table no longer will be blocked by ALTER TABLE for the same table which awaits for metadata lock upgrade (this is due to removal of mysql_lock_abort() from wait_while_table_is_used()). mysql-test/r/mdl_sync.result: Added test coverage for basic deadlock detection in metadata locking subsystem and for bug #46273 "MySQL 5.4.4 new MDL: Bug#989 is not fully fixed in case of ALTER". mysql-test/r/sp-lock.result: Adjusted test coverage for metadata locking for stored routines since after introduction of basic deadlock detector for metadata locks number of scenarios in which ER_LOCK_DEADLOCK error in absence of deadlock has decreased. mysql-test/t/mdl_sync.test: Added test coverage for basic deadlock detection in metadata locking subsystem and for bug #46273 "MySQL 5.4.4 new MDL: Bug#989 is not fully fixed in case of ALTER". mysql-test/t/sp-lock.test: Adjusted test coverage for metadata locking for stored routines since after introduction of basic deadlock detector for metadata locks number of scenarios in which ER_LOCK_DEADLOCK error in absence of deadlock has decreased. sql/log_event_old.cc: close_tables_for_reopen() now takes one more argument which specifies at which point it should stop releasing metadata locks acquired by this connection. sql/mdl.cc: Changed metadata locking subsystem to support basic deadlock detection with a help of the following simple empiric -- we assume that there is a deadlock if there is a connection which has to wait for a metadata lock which is currently acquired by some connection which is itself waiting to be able to acquire some shared metadata lock. To implement this change: - Added MDL_context::can_wait_lead_to_deadlock()/_impl() methods which allow to find out if there is someone waiting for metadata lock which is held by the connection and therefore deadlocks are possible if this connection is going to wait for some metadata lock. To do this added version of MDL_ticket::has_pending_conflicting_lock() method which assumes that its caller already owns LOCK_mdl mutex. - Changed MDL_context::wait_for_locks() to use one of the above methods to check if somebody is waiting for metadata lock owned by this context (and therefore deadlock is possible) and emit ER_LOCK_DEADLOCK error in this case. Also now we mark context of connections waiting inside of this method by setting MDL_context::m_is_waiting_in_mdl member. Thanks to this such connection could be waken up if some other connection starts waiting for one of its metadata locks and so a deadlock can occur. - Adjusted notify_shared_lock() to wake up connections which wait inside MDL_context::wait_for_locks() while holding shared metadata lock. - Changed MDL_ticket::upgrade_shared_lock_to_exclusive() to add temporary ticket for exclusive lock to MDL_lock::waiting queue, so request for metadata lock upgrade can be properly detected by our empiric. Also now this method invokes a callback which forces transactions holding shared metadata lock on the table to call MDL_context:: can_wait_lead_to_deadlock() method even if they don't need any new metadata locks. Thanks to this such transactions can detect deadlocks/ livelocks between MDL and table-level locks. Also reduced timeouts between calls to notify_shared_lock() in MDL_ticket::upgrade_shared_lock_to_exclusive() and MDL_context::acquire_exclusive_locks(). This was necessary to get rid of call to mysql_lock_abort() in wait_while_table_is_used(). (Now we instead rely on notify_shared_lock() timely calling mysql_lock_abort_for_thread() for the table on which lock is being upgraded/acquired). sql/mdl.h: - Added a version of MDL_ticket::has_pending_conflicting_lock() method to be used in situations when caller already has acquired LOCK_mdl mutex. - Added MDL_context::can_wait_lead_to_deadlock()/_impl() methods which allow to find out if there is someone waiting for metadata lock which is held by this connection and thus deadlocks are possible if this connections will start waiting for some metadata lock. - Added MDL_context::m_is_waiting_in_mdl member to mark connections waiting in MDL_context::wait_for_locks() method of metadata locking subsystem. Added getter method for this private member to make it accessible in notify_shared_lock() auxiliary so we can wake-up such connections if they hold shared metadata locks. - Finally, added mysql_abort_transactions_with_shared_lock() callback to be able force transactions which don't need any new metadata locks still call MDL_context::can_wait_lead_to_deadlock() and detect some of deadlocks between metadata locks and table-level locks. sql/mysql_priv.h: close_tables_for_reopen() now takes one more argument which specifies at which point it should stop releasing metadata locks acquired by this connection. sql/sql_base.cc: Changed approach to metadata locking for multi-statement transactions. We no longer fail ER_LOCK_DEADLOCK error immediately when we encounter conflicting metadata lock. Instead we release all metadata locks acquired by current statement and start to wait until conflicting locks to go away by calling MDL_context::wait_for_locks() method. To avoid deadlocks the latter implements simple empiric which aborts waiting with ER_LOCK_DEADLOCK error if it turns out that somebody is waiting for metadata locks owned by this transaction. To implement the change described above: - Introduced Open_table_context::m_start_of_statement_svp member to store state of metadata locks at the start of the statement. - Changed Open_table_context::request_backoff_action() not to fail with ER_LOCK_DEADLOCK immediately if back-off is requested due to conflicting metadata lock. - Added new argument for close_tables_for_reopen() procedure which allows to specify subset of metadata locks to be released. - Changed open_tables() not to release all metadata locks acquired by current transaction when metadata lock conflict is discovered. Instead we release only locks acquired by current statement. - Changed open_ltable() and open_and_lock_tables_derived() not to emit ER_LOCK_DEADLOCK error when mysql_lock_tables() is aborted in multi-statement transaction when somebody tries to acquire exclusive metadata lock on the table. Instead we release metadata locks acquired by current statement and try to wait until they can be re-acquired. - Adjusted tdc_wait_for_old_versions() to check if there is someone waiting for one of metadata locks held by this connection and run deadlock detection in order to avoid deadlocks in some situations. - Added mysql_abort_transactions_with_shared_lock() callback which allows to force transactions holding shared metadata lock on the table to call MDL_context::can_wait_lead_to_deadlock() even if they don't need any new metadata locks so they can detect potential deadlocks between metadata locking subsystem and table-level locks. - Adjusted wait_while_table_is_used() not to set TABLE::version to 0 as it is now done only when necessary by the above-mentioned callback. Also removed unnecessary call to mysql_lock_abort(). Instead we rely on code performing metadata lock upgrade aborting waits on the table-level lock for this table by calling mysql_lock_abort_for_thread() (invoked by mysql_notify_thread_having_shared_lock()). In future this should allow to reduce number of scenarios in which we produce ER_LOCK_DEADLOCK error even though no real deadlock exists. sql/sql_class.h: Introduced Open_table_context::m_start_of_statement_svp member to store state of metadata locks at the start of the statement. Replaced Open_table_context::m_can_deadlock member with m_has_locks member to reflect the fact that we no longer unconditionally emit ER_LOCK_DEADLOCK error for transaction having some metadata locks when conflicting metadata lock is discovered. sql/sql_insert.cc: close_tables_for_reopen() now takes one more argument which specifies at which point it should stop releasing metadata locks acquired by this connection. sql/sql_plist.h: Made I_P_List_iterator<T, B> usable with const lists. sql/sql_show.cc: close_tables_for_reopen() now takes one more argument which specifies at which point it should stop releasing metadata locks acquired by this connection. sql/sql_update.cc: Changed UPDATE and MULTI-UPDATE code not to release all metadata locks when calls to mysql_lock_tables() are aborted. Instead we release only locks which are acquired by this statement and then try to reacquire them by calling open_tables(). This solves bug #46273 "MySQL 5.4.4 new MDL: Bug#989 is not fully fixed in case of ALTER".	2009-12-30 20:53:30 +03:00
Konstantin Osipov	bf9c1b7353	Apply and review: ... 3655 Jon Olav Hauglid 2009-10-19 Bug #30977 Concurrent statement using stored function and DROP FUNCTION breaks SBR Bug #48246 assert in close_thread_table Implement a fix for: Bug #41804 purge stored procedure cache causes mysterious hang for many minutes Bug #49972 Crash in prepared statements The problem was that concurrent execution of DML statements that use stored functions and DDL statements that drop/modify the same function might result in incorrect binary log in statement (and mixed) mode and therefore break replication. This patch fixes the problem by introducing metadata locking for stored procedures and functions. This is similar to what is done in Bug#25144 for views. Procedures and functions now are locked using metadata locks until the transaction is either committed or rolled back. This prevents other statements from modifying the procedure/function while it is being executed. This provides commit ordering - guaranteeing serializability across multiple transactions and thus fixes the reported binlog problem. Note that we do not take locks for top-level CALLs. This means that procedures called directly are not protected from changes by simultaneous DDL operations so they are executed at the state they had at the time of the CALL. By not taking locks for top-level CALLs, we still allow transactions to be started inside procedures. This patch also changes stored procedure cache invalidation. Upon a change of cache version, we no longer invalidate the entire cache, but only those routines which we use, only when a statement is executed that uses them. This patch also changes the logic of prepared statement validation. A stored procedure used by a prepared statement is now validated only once a metadata lock has been acquired. A version mismatch causes a flush of the obsolete routine from the cache and statement reprepare. Incompatible changes: 1) ER_LOCK_DEADLOCK is reported for a transaction trying to access a procedure/function that is locked by a DDL operation in another connection. 2) Procedure/function DDL operations are now prohibited in LOCK TABLES mode as exclusive locks must be taken all at once and LOCK TABLES provides no way to specifiy procedures/functions to be locked. Test cases have been added to sp-lock.test and rpl_sp.test. Work on this bug has very much been a team effort and this patch includes and is based on contributions from Davi Arnaut, Dmitry Lenev, Magne Mæhre and Konstantin Osipov. mysql-test/r/ps_ddl.result: Update results (Bug#30977). mysql-test/r/ps_ddl1.result: Update results (Bug#30977). mysql-test/r/sp-error.result: Update results (Bug#30977). mysql-test/r/sp-lock.result: Update results (Bug#30977). mysql-test/suite/rpl/r/rpl_sp.result: Update results (Bug#30977). mysql-test/suite/rpl/t/rpl_sp.test: Add a test case for Bug#30977. mysql-test/t/ps_ddl.test: Update comments. We no longer re-prepare a prepared statement when a stored procedure used in top-level CALL is changed. mysql-test/t/ps_ddl1.test: Modifying stored procedure p1 no longer invalidates prepared statement "call p1" -- we can re-use the prepared statement without invalidation. mysql-test/t/sp-error.test: Use a constant for an error value. mysql-test/t/sp-lock.test: Add test coverage for Bug#30977. sql/lock.cc: Implement lock_routine_name() - a way to acquire an exclusive metadata lock (ex- name-lock) on stored procedure/function. sql/sp.cc: Change semantics of sp_cache_routine() -- now it has an option to make sure that the routine that is cached is up to date (has the latest sp cache version). Add sp_cache_invalidate() to sp_drop_routine(), where it was missing (a bug!). Acquire metadata locks for SP DDL (ALTER/CREATE/DROP). This is the core of the fix for Bug#30977. Since caching and cache invalidation scheme was changed, make sure we don't invalidate the SP cache in the middle of a stored routine execution. At the same time, make sure we don't access stale data due to lack of invalidation. For that, change ALTER FUNCTION/PROCEDURE to not use the cache, and SHOW PROCEDURE CODE/SHOW CREATE PROCEDURE/FUNCTION to always read an up to date version of the routine from the cache. sql/sp.h: Add a helper wrapper around sp_cache_routine(). sql/sp_cache.cc: Implement new sp_cache_version() and sp_cache_flush_obsolete(). Now we flush stale routines individually, rather than all at once. sql/sp_cache.h: Update signatures of sp_cache_version() and sp_cache_flush_obsolete(). sql/sp_head.cc: Add a default initialization of sp_head::m_sp_cache_version. Remove a redundant sp_head::create(). sql/sp_head.h: Add m_sp_cache_version to sp_head class - we now keep track of every routine in the stored procedure cache, rather than of the entire cache. sql/sql_base.cc: Implement prelocking for stored routines. Validate stored routines after they were locked. Flush obsolete routines upon next access, one by one, not all at once (Bug#41804). Style fixes. sql/sql_class.h: Rename a Open_table_context method. sql/sql_parse.cc: Make sure stored procedures DDL commits the active transaction (issues an implicit commit before and after). Remove sp_head::create(), a pure redundancy. Move the semantical check during alter routine inside sp_update_routine() code in order to: - avoid using SP cache during update, it may be obsolete. - speed up and simplify the update procedure. Remove sp_cache_flush_obsolete() calls, we no longer flush the entire cache, ever, stale routines are flushed before next use, one at a time. sql/sql_prepare.cc: Move routine metadata validation to open_and_process_routine(). Fix Bug#49972 (don't swap flags at reprepare). Reset Sroutine_hash_entries in reinit_stmt_before_use(). Remove SP cache invalidation, it's now done by open_tables(). sql/sql_show.cc: Fix a warning: remove an unused label. sql/sql_table.cc: Reset mdl_request.ticket for tickets acquired for routines inlined through a view, in CHECK TABLE statement, to satisfy an MDL assert. sql/sql_update.cc: Move the cleanup of "translation items" to close_tables_for_reopen(), since it's needed in all cases when we back off, not just the back-off in multi-update. This fixes a bug when the server would crash on attempt to back off when opening tables for a statement that uses information_schema tables.	2009-12-29 15:19:05 +03:00
Alexey Kopytov	6c716007d1	Manual merge of WL#4738 from mysql-next-mr: ... - backported code that handles %f/%g arguments in my_vsnprintf.c from 6.0 - backported %f/%g tests in unittest/mysys/my_vsnprintf-t.c from 6.0 - replaced snprintf("%g") in sql/set_var.cc with my_gcvt() - removed unnecessary "--replace-result"s for Windows in mysql-test/suite/sys_vars/t/long_query_time_basic.test - some test results adjustments	2009-12-28 15:54:16 +03:00
Alexander Nozdrin	c3eabe01fc	Auto-merge from mysql-next-mr.	2009-12-25 16:22:25 +03:00
Sergey Glukhov	81391bd00c	Bug#49501 Inefficient information_schema check (system collation) ... added check_length optimization for I_S_NAME comparison sql/event_data_objects.cc: added check_length optimization for I_S_NAME comparison sql/events.cc: added check_length optimization for I_S_NAME comparison sql/mysql_priv.h: added check_length optimization for I_S_NAME comparison sql/repl_failsafe.cc: added check_length optimization for I_S_NAME comparison sql/sql_db.cc: added check_length optimization for I_S_NAME comparison sql/sql_parse.cc: added check_length optimization for I_S_NAME comparison sql/sql_show.cc: added check_length optimization for I_S_NAME comparison sql/sql_view.cc: added check_length optimization for I_S_NAME comparison sql/table.cc: added check_length optimization for I_S_NAME comparison	2010-01-19 13:03:40 +04:00
Alexey Kopytov	12f364ece7	Backport of WL #2934: Make/find library for doing float/double ... to string conversions and vice versa" Initial import of the dtoa.c code and custom wrappers around it to allow its usage from the server code. Conversion of FLOAT/DOUBLE values to DECIMAL ones or strings and vice versa has been significantly reworked. As the new algoritms are more precise than the older ones, results of such conversions may not always match those obtained from older server versions. This in turn may break compatibility for some applications. This patch also fixes the following bugs: - bug #12860 "Difference in zero padding of exponent between Unix and Windows" - bug #21497 "DOUBLE truncated to unusable value" - bug #26788 "mysqld (debug) aborts when inserting specific numbers into char fields" - bug #24541 "Data truncated..." on decimal type columns without any good reason"	2009-12-22 19:23:13 +03:00
Sergei Golubchik	1ad5bb1a69	WL#4738 streamline/simplify @@variable creation process ... Bug#16565 mysqld --help --verbose does not order variablesBug#20413 sql_slave_skip_counter is not shown in show variables Bug#20415 Output of mysqld --help --verbose is incomplete Bug#25430 variable not found in SELECT @@global.ft_max_word_len; Bug#32902 plugin variables don't know their names Bug#34599 MySQLD Option and Variable Reference need to be consistent in formatting! Bug#34829 No default value for variable and setting default does not raise error Bug#34834 ? Is accepted as a valid sql mode Bug#34878 Few variables have default value according to documentation but error occurs Bug#34883 ft_boolean_syntax cant be assigned from user variable to global var. Bug#37187 `INFORMATION_SCHEMA`.`GLOBAL_VARIABLES`: inconsistent status Bug#40988 log_output_basic.test succeeded though syntactically false. Bug#41010 enum-style command-line options are not honoured (maria.maria-recover fails) Bug#42103 Setting key_buffer_size to a negative value may lead to very large allocations Bug#44691 Some plugins configured as MYSQL_PLUGIN_MANDATORY in can be disabled Bug#44797 plugins w/o command-line options have no disabling option in --help Bug#46314 string system variables don't support expressions Bug#46470 sys_vars.max_binlog_cache_size_basic_32 is broken Bug#46586 When using the plugin interface the type "set" for options caused a crash. Bug#47212 Crash in DBUG_PRINT in mysqltest.cc when trying to print octal number Bug#48758 mysqltest crashes on sys_vars.collation_server_basic in gcov builds Bug#49417 some complaints about mysqld --help --verbose output Bug#49540 DEFAULT value of binlog_format isn't the default value Bug#49640 ambiguous option '--skip-skip-myisam' (double skip prefix) Bug#49644 init_connect and \0 Bug#49645 init_slave and multi-byte characters Bug#49646 mysql --show-warnings crashes when server dies CMakeLists.txt: Bug#44691 Some plugins configured as MYSQL_PLUGIN_MANDATORY in can be disabled client/mysql.cc: don't crash with --show-warnings when mysqld dies config/ac-macros/plugins.m4: Bug#44691 Some plugins configured as MYSQL_PLUGIN_MANDATORY in can be disabled include/my_getopt.h: comments include/my_pthread.h: fix double #define mysql-test/mysql-test-run.pl: run sys_vars suite by default properly recognize envirinment variables (e.g. MTR_MAX_SAVE_CORE) set to 0 escape gdb command line arguments mysql-test/suite/sys_vars/r/rpl_init_slave_func.result: init_slave+utf8 bug mysql-test/suite/sys_vars/t/rpl_init_slave_func.test: init_slave+utf8 bug mysys/my_getopt.c: Bug#34599 MySQLD Option and Variable Reference need to be consistent in formatting! Bug#46586 When using the plugin interface the type "set" for options caused a crash. Bug#49640 ambiguous option '--skip-skip-myisam' (double skip prefix) mysys/typelib.c: support for flagset sql/ha_ndbcluster.cc: backport from telco tree sql/item_func.cc: Bug#49644 init_connect and \0 Bug#49645 init_slave and multi-byte characters sql/sql_builtin.cc.in: Bug#44691 Some plugins configured as MYSQL_PLUGIN_MANDATORY in can be disabled sql/sql_plugin.cc: Bug#44691 Some plugins configured as MYSQL_PLUGIN_MANDATORY in can be disabled Bug#32902 plugin variables don't know their names Bug#44797 plugins w/o command-line options have no disabling option in --help sql/sys_vars.cc: all server variables are defined here storage/myisam/ft_parser.c: remove unnecessary updates of param->quot storage/myisam/ha_myisam.cc: myisam_* variables belong here strings/my_vsnprintf.c: %o and %llx unittest/mysys/my_vsnprintf-t.c: %o and %llx tests vio/viosocket.c: bugfix: fix @@wait_timeout to work with socket timeouts (vs. alarm thread)	2009-12-22 10:35:56 +01:00
Alexander Nozdrin	a5cdaab3eb	Auto-merge from mysql-next-mr.	2009-12-19 11:35:19 +03:00
Vladislav Vaintroub	8cffae12a6	merge	2009-12-18 22:13:56 +01:00
Alexander Nozdrin	6e5c7b80bd	Manual merge from mysql-next-mr. ... Conflicts: - mysys/charset.c - mysys/my_thr_init.c	2009-12-17 23:02:52 +03:00
Mikael Ronstrom	7548f142c3	BUG#49591, Fixed version string in SHOW CREATE TABLE to accomodate for column list partitioning and new function to_seconds	2009-12-17 18:39:10 +01:00
Alexander Nozdrin	5f0c09dd72	Manual merge from mysql-trunk-merge. ... Conflicts: - include/my_no_pthread.h - mysql-test/r/sp-ucs2.result - sql/log.cc - sql/sql_acl.cc - sql/sql_yacc.yy	2009-12-16 21:02:21 +03:00
Konstantin Osipov	92b1c2f3ca	Merge next-mr -> next-4284.	2009-12-15 22:03:56 +03:00
Georgi Kodinov	d2e723bf53	Bug #48985: show create table crashes if previous access to the table ... was killed Merge the fix from 5.1-bugteam to 5.1-main	2009-12-15 11:03:24 +02:00
Marc Alff	0531f85e16	Merge cleanup	2009-12-11 12:45:44 -07:00
Alexey Kopytov	ebdef570e5	Manual merge of mysql-5.1-bugteam into mysql-trunk-merge.	2009-12-11 19:40:58 +03:00
Marc Alff	bea4ab9bb6	Merge mysql-next-mr (revno 2936) --> mysql-next-mr-marc	2009-12-11 01:58:13 -07:00
Konstantin Osipov	f26f632b44	Backport of: ... ------------------------------------------------------------ revno: 2617.68.25 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-next-bg-pre2-2 timestamp: Wed 2009-09-16 18:26:50 +0400 message: Follow-up for one of pre-requisite patches for fixing bug #30977 "Concurrent statement using stored function and DROP FUNCTION breaks SBR". Made enum_mdl_namespace enum part of MDL_key class and removed MDL_ prefix from the names of enum members. In order to do the latter changed name of PROCEDURE symbol to PROCEDURE_SYM (otherwise macro which was automatically generated for this symbol conflicted with MDL_key::PROCEDURE enum member).	2009-12-10 11:21:38 +03:00
Marc Alff	c082955f06	WL#2360 Performance schema ... Part III: mysys instrumentation	2009-12-09 20:19:51 -07:00
Konstantin Osipov	2f26574026	Backport of: ... ------------------------------------------------------------ revno: 2617.68.7 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-next-bg46044 timestamp: Thu 2009-08-27 10:22:17 +0400 message: Fix for bug #46044 "MDL deadlock on LOCK TABLE + CREATE TABLE HIGH_PRIORITY FOR UPDATE". Deadlock occured when during execution of query to I_S we tried to open a table or its .FRM in order to get information about it and had to wait because we have encountered exclusive metadata lock on this table held by a DDL operation from another connection which in its turn waited for some resource currently owned by connection executing this I_S query. For example, this might have happened if one under LOCK TABLES executed I_S query targeted to particular table (which was not among locked) and also concurrently tried to create this table using CREATE TABLE SELECT which had to wait for one of tables locked by the first connection. Another situation in which deadlock might have occured is when I_S query, which was executed as part of transaction, tried to get information about table which just has been dropped by concurrent DROP TABLES executed under LOCK TABLES and this DROP TABLES for its completion also had to wait transaction from the first connection. This problem stemmed from the fact that opening of tables/.FRMs for I_S filling is happening outside of connection's main MDL_context so code which tries to detect deadlocks due to conflicting metadata locks doesn't work in this case. Indeed, this led to deadlocks when during I_S filling we tried to wait for conflicting metadata lock to go away, while its owner was waiting for some resource held by connection executing I_S query. This patch solves this problem by avoiding waiting in such situation. Instead we skip this table and produce warning that information about it was omitted from I_S due to concurrent DDL operation. We still wait for conflicting metadata lock to go away when it is known that deadlock is not possible (i.e. when connection executing I_S query does not hold any metadata or table-level locks). Basically, we apply our standard deadlock avoidance technique for metadata locks to the process of filling of I_S tables but replace ER_LOCK_DEADLOCK error with a warning. Note that this change is supposed to be safe for 'mysqldump' since the only its mode which is affected by this change is --single-transaction mode is not safe in the presence of concurrent DDL anyway (and this fact is documented). Other modes are unaffected because they either use SHOW TABLES/SELECT * FROM I_S.TABLE_NAMES which do not take any metadata locks in the process of I_S table filling and thus cannot skip tables or execute I_S queries for tables which were previously locked by LOCK TABLES (or in the presence of global read lock) which excludes possibility of encountering conflicting metadata lock. mysql-test/r/mdl_sync.result: Added test for bug #46044 "MDL deadlock on LOCK TABLE + CREATE TABLE HIGH_PRIORITY FOR UPDATE". mysql-test/t/mdl_sync.test: Added test for bug #46044 "MDL deadlock on LOCK TABLE + CREATE TABLE HIGH_PRIORITY FOR UPDATE". sql/mysql_priv.h: Added a new flag for open_table() call which allows it to fail with an error in cases when conflicting metadata lock is discovered instead of waiting until this lock goes away. sql/share/errmsg-utf8.txt: Added error/warning message to be generated in cases when information about table is omitted from I_S since there is conflicting metadata lock on the table. sql/share/errmsg.txt: Added error/warning message to be generated in cases when information about table is omitted from I_S since there is conflicting metadata lock on the table. sql/sql_base.cc: Added a new flag for open_table() call which allows it to fail with an error in cases when conflicting metadata lock is discovered instead of waiting until this lock goes away. sql/sql_show.cc: When we are opening a table (or just .FRM) in order to fill I_S with information about this table and encounter conflicting metadata lock waiting for this lock to go away can lead to a deadlock in some situations (under LOCK TABLES, within transaction, etc.). To avoid these deadlocks we detect such situations and don't do waiting. Instead, we skip table for which we have conflicting metadata lock, thus omitting information about it from I_S table, and produce an appropriate warning.	2009-12-09 18:48:42 +03:00
Sergey Vojtovich	cda5ad508a	Merge mysql-next-mr to mysql-next-mr-svoj.	2009-12-09 15:03:34 +04:00
Jon Olav Hauglid	546e16ebd8	Backport of revno: 2617.69.40 ... A pre-requisite patch for Bug#30977 "Concurrent statement using stored function and DROP FUNCTION breaks SBR". This patch changes the MDL API by introducing a namespace for lock keys: MDL_TABLE for tables and views and MDL_PROCEDURE for stored procedures and functions. The latter is needed for the fix for Bug#30977.	2009-12-09 09:51:20 +01:00
unknown	08e4635fba	merge 5.1-> 5.2	2009-12-08 23:47:54 +02:00
Konstantin Osipov	ce5c87a3d3	Backport of: ... ---------------------------------------------------------- revno: 2617.69.20 committer: Konstantin Osipov <kostja@sun.com> branch nick: 5.4-4284-1-assert timestamp: Thu 2009-08-13 18:29:55 +0400 message: WL#4284 "Transactional DDL locking" A review fix. Since WL#4284 implementation separated MDL_request and MDL_ticket, MDL_request becamse a utility object necessary only to get a ticket. Store it by-value in TABLE_LIST with the intent to merge MDL_request::key with table_list->table_name and table_list->db in future. Change the MDL subsystem to not require MDL_requests to stay around till close_thread_tables(). Remove the list of requests from the MDL context. Requests for shared metadata locks acquired in open_tables() are only used as a list in recover_from_failed_open_table_attempt(), which calls mdl_context.wait_for_locks() for this list. To keep such list for recover_from_failed_open_table_attempt(), introduce a context class (Open_table_context), that collects all requests. A lot of minor cleanups and simplications that became possible with this change. sql/event_db_repository.cc: Remove alloc_mdl_requests(). Now MDL_request instance is a member of TABLE_LIST, and init_one_table() initializes it. sql/ha_ndbcluster_binlog.cc: Remove now unnecessary declaration and initialization of binlog_mdl_request. sql/lock.cc: No need to allocate MDL requests in lock_table_names() now. sql/log.cc: Use init_one_table() method, remove alloc_mdl_requests(), which is now unnecessary. sql/log_event.cc: No need to allocate mdl_request separately now. Use init_one_table() method. sql/log_event_old.cc: Update to the new signature of close_tables_for_reopen(). sql/mdl.cc: Update try_acquire_exclusive_lock() to be more easy to use. Function lock_table_name_if_not_cached() has been removed. Make acquire_shared_lock() signature consistent with try_acquire_exclusive_lock() signature. Remove methods that are no longer used. Update comments. sql/mdl.h: Implement an assignment operator that doesn't copy MDL_key (MDL_key::operator= is private and should remain private). This is a hack to work-around assignment of TABLE_LIST by value in several places. Such assignments violate encapsulation, since only perform a shallow copy. In most cases these assignments are a hack on their own. sql/mysql_priv.h: Update signatures of close_thread_tables() and close_tables_for_reopen(). sql/sp.cc: Allocate TABLE_LIST in thd->mem_root. Use init_one_table(). sql/sp_head.cc: Use init_one_table(). Remove thd->locked_tables_root, it's no longer needed. sql/sql_acl.cc: Use init_mdl_requests() and init_one_table(). sql/sql_base.cc: Update to new signatures of try_acquire_shared_lock() and try_acquire_exclusive_lock(). Remove lock_table_name_if_not_cached(). Fix a bug in open_ltable() that would not return ER_LOCK_DEADLOCK in case of a failed lock_tables() and a multi-statement transaction. Fix a bug in open_and_lock_tables_derived() that would not return ER_LOCK_DEADLOCK in case of a multi-statement transaction and a failure of lock_tables(). Move assignment of enum_open_table_action to a method of Open_table_context, a new class that maintains information for backoff actions. Minor rearrangements of the code. Remove alloc_mdl_requests() in functions that work with system tables: instead the patch ensures that callers always initialize TABLE_LIST argument. sql/sql_class.cc: THD::locked_tables_root is no more. sql/sql_class.h: THD::locked_tables_root is no more. Add a declaration for Open_table_context class. sql/sql_delete.cc: Update to use the simplified MDL API. sql/sql_handler.cc: TABLE_LIST::mdl_request is stored by-value now. Ensure that mdl_request.ticket is NULL for every request that is passed into MDL, to satisfy MDL asserts. @ sql/sql_help.cc Function open_system_tables_for_read() no longer initializes mdl_requests. Move TABLE_LIST::mdl_request initialization closer to TABLE_LIST initialization. sql/sql_help.cc: Function open_system_tables_for_read() no longer initializes mdl_requests. Move TABLE_LIST::mdl_request initialization closer to TABLE_LIST initialization. sql/sql_insert.cc: Remove assignment by-value of TABLE_LIST in TABLEOP_HOOKS. We can't carry over a granted MDL ticket from one table list to another. sql/sql_parse.cc: Change alloc_mdl_requests() -> init_mdl_requests(). @todo We can remove init_mdl_requests() altogether in some places: all places that call add_table_to_list() already have mdl requests initialized. sql/sql_plugin.cc: Use init_one_table(). THD::locked_tables_root is no more. sql/sql_servers.cc: Use init_one_table(). sql/sql_show.cc: Update acquire_high_priority_shared_lock() to use TABLE_LIST::mdl_request rather than allocate an own. Fix get_trigger_table_impl() to use init_one_table(), check for out of memory, follow the coding style. sql/sql_table.cc: Update to work with TABLE_LIST::mdl_request by-value. Remove lock_table_name_if_not_cached(). The code that used to delegate to it is quite simple and concise without it now. sql/sql_udf.cc: Use init_one_table(). sql/sql_update.cc: Update to use the new signature of close_tables_for_reopen(). sql/table.cc: Move re-setting of mdl_requests for prepared statements and stored procedures from close_thread_tables() to reinit_stmt_before_use(). Change alloc_mdl_requests() to init_mdl_requests(). init_mdl_requests() is a hack that can't be deleted until we don't have a list-aware TABLE_LIST constructor. Hopefully its use will be minimal sql/table.h: Change alloc_mdl_requests() to init_mdl_requests() TABLE_LIST::mdl_request is stored by value. sql/tztime.cc: We no longer initialize mdl requests in open_system_tables_for*() functions. Move this initialization closer to initialization of the rest of TABLE_LIST members. storage/myisammrg/ha_myisammrg.cc: Simplify mdl_request initialization.	2009-12-08 12:57:07 +03:00
Sergey Vojtovich	e8d0168475	WL#2511 - Add a new table to the Information Schema for TABLESPACE's ... Implemented a new INFORMATION_SCHEMA table, which is intended to provide information about tablespaces. mysql-test/r/information_schema.result: Updated test result according to WL#2511. With this WL I_S has new TABLESPACES schema. mysql-test/r/information_schema_db.result: Updated test result according to WL#2511. With this WL I_S has new TABLESPACES schema. mysql-test/r/mysqlshow.result: Updated test result according to WL#2511. With this WL I_S has new TABLESPACES schema. mysql-test/suite/funcs_1/r/is_columns_is.result: Updated test result according to WL#2511. With this WL I_S has new TABLESPACES schema. mysql-test/suite/funcs_1/r/is_tables_is.result: Updated test result according to WL#2511. With this WL I_S has new TABLESPACES schema. sql/handler.h: Added SCH_TABLESPACES to enum_schema_tables. sql/mysql_priv.h: Added human readable definitions for I_S.TABLESPACES field identifiers. sql/sql_show.cc: Added I_S.TABLESPACES schema. The code which handles I_S.FILES is capable to handle I_S.TABLESPACES as well. Thus we reuse this code and let functions/variables have more generic names.	2009-12-07 16:22:51 +04:00
Konstantin Osipov	a9013f8fba	Backport of: ... ---------------------------------------------------------- revno: 2617.23.20 committer: Konstantin Osipov <kostja@sun.com> branch nick: mysql-6.0-runtime timestamp: Wed 2009-03-04 16:31:31 +0300 message: WL#4284 "Transactional DDL locking" Review comments: "Objectify" the MDL API. MDL_request and MDL_context still need manual construction and destruction, since they are used in environment that is averse to constructors/destructors. sql/mdl.cc: Improve comments. Add asserts to backup()/restore_from_backup()/merge() methods. Fix an order bug in the error path of mdl_acquire_exclusive_locks(): we used to first free a ticket object, and only then exclude it from the list of tickets.	2009-12-04 02:52:05 +03:00
Konstantin Osipov	f477e66ec5	Backport of: ... ------------------------------------------------------------ revno: 2617.23.18 committer: Davi Arnaut <Davi.Arnaut@Sun.COM> branch nick: 4284-6.0 timestamp: Mon 2009-03-02 18:18:26 -0300 message: Bug#989: If DROP TABLE while there's an active transaction, wrong binlog order WL#4284: Transactional DDL locking This is a prerequisite patch: These changes are intended to split lock requests from granted locks and to allow the memory and lifetime of granted locks to be managed within the MDL subsystem. Furthermore, tickets can now be shared and therefore are used to satisfy multiple lock requests, but only shared locks can be recursive. The problem is that the MDL subsystem morphs lock requests into granted locks locks but does not manage the memory and lifetime of lock requests, and hence, does not manage the memory of granted locks either. This can be problematic because it puts the burden of tracking references on the users of the subsystem and it can't be easily done in transactional contexts where the locks have to be kept around for the duration of a transaction. Another issue is that recursive locks (when the context trying to acquire a lock already holds a lock on the same object) requires that each time the lock is granted, a unique lock request/granted lock structure structure must be kept around until the lock is released. This can lead to memory leaks in transactional contexts as locks taken during the transaction should only be released at the end of the transaction. This also leads to unnecessary wake ups (broadcasts) in the MDL subsystem if the context still holds a equivalent of the lock being released. These issues are exacerbated due to the fact that WL#4284 low-level design says that the implementation should "2) Store metadata locks in transaction memory root, rather than statement memory root" but this is not possible because a memory root, as implemented in mysys, requires all objects allocated from it to be freed all at once. This patch combines review input and significant code contributions from Konstantin Osipov (kostja) and Dmitri Lenev (dlenev). mysql-test/r/mdl_sync.result: Add test case result. mysql-test/t/mdl_sync.test: Add test case for shared lock upgrade case. sql/event_db_repository.cc: Rename mdl_alloc_lock to mdl_request_alloc. sql/ha_ndbcluster_binlog.cc: Use new function names to initialize MDL lock requests. sql/lock.cc: Rename MDL functions. sql/log_event.cc: The MDL request now holds the table and database name data (MDL_KEY). sql/mdl.cc: Move the MDL key to the MDL_LOCK structure in order to make the object suitable for allocation from a fixed-size allocator. This allows the simplification of the lists in the MDL_LOCK object, which now are just two, one for granted tickets and other for waiting (upgraders) tickets. Recursive requests for a shared lock on the same object can now be granted using the same lock ticket. This schema is only used for shared locks because that the only case that matters. This is used to avoid waste of resources in case a context (connection) already holds a shared lock on a object. sql/mdl.h: Introduce a metadata lock object key which is used to uniquely identify lock objects. Separate the structure used to represent pending lock requests from the structure used to represent granted metadata locks. Rename functions used to manipulate locks requests in order to have a more consistent function naming schema. sql/sp_head.cc: Rename mdl_alloc_lock to mdl_request_alloc. sql/sql_acl.cc: Rename alloc_mdl_locks to alloc_mdl_requests. sql/sql_base.cc: Various changes to accommodate that lock requests are separated from lock tickets (granted locks). sql/sql_class.h: Last acquired lock before the savepoint was set. sql/sql_delete.cc: Various changes to accommodate that lock requests are separated from lock tickets (granted locks). sql/sql_handler.cc: Various changes to accommodate that lock requests are separated from lock tickets (granted locks). sql/sql_insert.cc: Rename alloc_mdl_locks to alloc_mdl_requests. sql/sql_parse.cc: Rename alloc_mdl_locks to alloc_mdl_requests. sql/sql_plist.h: Typedef for iterator type. sql/sql_plugin.cc: Rename alloc_mdl_locks to alloc_mdl_requests. sql/sql_servers.cc: Rename alloc_mdl_locks to alloc_mdl_requests. sql/sql_show.cc: Various changes to accommodate that lock requests are separated from lock tickets (granted locks). sql/sql_table.cc: Various changes to accommodate that lock requests are separated from lock tickets (granted locks). sql/sql_trigger.cc: Save reference to the lock ticket so it can be downgraded later. sql/sql_udf.cc: Rename alloc_mdl_locks to alloc_mdl_requests. sql/table.cc: Rename mdl_alloc_lock to mdl_request_alloc. sql/table.h: Separate MDL lock requests from lock tickets (granted locks). storage/myisammrg/ha_myisammrg.cc: Rename alloc_mdl_locks to alloc_mdl_requests.	2009-12-04 02:29:40 +03:00
Georgi Kodinov	9091535c5f	Bug #48985: show create table crashes if previous access to the table was killed ... When checking for an error after removing the special view error handler the code was not taking into account that open_tables() may fail because of the current statement being killed. Added a check for thd->killed. Added a client program to test it.	2009-12-03 14:07:46 +02:00
Konstantin Osipov	c659143c1e	Merge next-mr -> next-4284	2009-12-03 14:37:42 +03:00
V Narayanan	e86daf9bf2	WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table ... The attached patch adds a method handlerton::fill_is_table that can be used instead of having to create specific handlerton::fill_*_table methods. sql/ha_ndbcluster.cc: WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table Implemented the method ndbcluster_fill_is_table that uses the supplied table id to switch to the appropriate fill_*_table method. sql/handler.h: WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table Moved the enum_schema_table enumeration from table.h to here. contains the declaration for the new method fill_is_tables. sql/sql_show.cc: WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table calls the fill_is_table method instead of the fill_files_table method. sql/table.h: WL#4448 Generalize the handlerton::fill_files_table call with handlerton::fill_is_table removed the earlier definition of enum_schema_tables.	2009-12-03 16:16:49 +05:30
Konstantin Osipov	124cda8a0a	Backport of: ... ------------------------------------------------------------ revno: 2630.4.33 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w2 timestamp: Fri 2008-06-20 17:11:20 +0400 message: WL#3726 "DDL locking for all metadata objects". After-review fixes in progress. Minimized dependency of mdl.cc on other modules (particularly made it independant of mysql_priv.h) in order to be able write unit tests for metadata locking subsystem. sql/ha_ndbcluster_binlog.cc: Use newly introduced MAX_MDLKEY_LENGTH constant for allocating buffer for object key for metadata locking subsystem. sql/log_event.cc: Use newly introduced MAX_MDLKEY_LENGTH constant for allocating buffer for object key for metadata locking subsystem. sql/mdl.cc: Removed dependency on THD class (and thus on mysql_priv.h) by using direct access to members of st_my_thread_var instead of accessing THD::killed/enter_cond()/exit_cond(). sql/mdl.h: Added MAX_MDLKEY_LENGTH constant to be used for allocating buffers for key for metadata locking subsystem. Added declarations of server kernel functions used by metadata locking subsystem to mdl.h in order to decrease dependency of mdl.cc on other files. sql/mysql_priv.h: Moved declaration of notify_thread_having_shared_lock() to the mdl.h (also renamed it to make clear in metadata locking code that it is a callback to SQL-layer). sql/sql_base.cc: Renamed notify_thread_having_shared_lock() to make it clear in metadata locking subsystem code that it is a callback to SQL layer. sql/sql_handler.cc: Use newly introduced MAX_MDLKEY_LENGTH constant for allocating buffer for object key for metadata locking subsystem. sql/sql_show.cc: Use newly introduced MAX_MDLKEY_LENGTH constant for allocating buffer for object key for metadata locking subsystem.	2009-12-02 19:31:57 +03:00
Konstantin Osipov	e3b3907c4f	Backport of: ... ------------------------------------------------------------ revno: 2630.4.32 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w2 timestamp: Thu 2008-06-19 16:39:58 +0400 message: WL#3726 "DDL locking for all metadata objects". After-review fixes in progress. Ensure that metadata locking subsystem properly handles out-of-memory conditions. Clarified MDL interface by separating release of locks and removal of lock requests from the context. sql/lock.cc: mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and mdl_remove_lock() to do this. sql/mdl.cc: Ensured that metadata locking subsystem properly handles out-of-memory conditions. Introduced new MDL_INITIALIZED state for metadata lock request which is used in all cases when lock is not acquired and we have not associated request with object respesenting lock. MDL_PENDING is now only used for requests for exclusive locks which are added to the MDL_LOCK::waiting_exclusive queue. mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and newly introduced mdl_remove_lock() to do this. Also renamed mdl_release_all_locks_for_name() to emphasize that it also actually removes lock requests from the context. Finally mdl_try_acquire_exclusive_lock() is now returs information about encountered lock conflict in separate out parameter since its return value is used for distinguishing between error (e.g. due to OOM) and success. sql/mdl.h: Introduced new MDL_INITIALIZED state for metadata lock request which is used in all cases when lock is not acquired and we have not associated request with object respesenting lock. MDL_PENDING is now only used for requests for exclusive locks which are added to the MDL_LOCK::waiting_exclusive queue. mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and newly introduced mdl_remove_lock() to do this. Also renamed mdl_release_all_locks_for_name() to emphasize that it also actually removes lock requests from the context. Finally mdl_try_acquire_exclusive_lock() is now returs information about encountered lock conflict in separate out parameter since its return value is used for distinguishing between error (e.g. due to OOM) and success. sql/sql_base.cc: mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and mdl_remove_lock() to do this. Also adjusted open_table() to ensure that it releases/removes metadata locks in case of error after adding/acquiring them (unless keeping these lock requests is required for recovering action). sql/sql_delete.cc: mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and mdl_remove_lock() to do this. sql/sql_handler.cc: mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and mdl_remove_lock() to do this. sql/sql_show.cc: mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and mdl_remove_lock() to do this. sql/sql_table.cc: Renamed mdl_release_all_locks_for_name() to emphasize that it also actually removes lock requests from the context. mdl_release_lock(), mdl_acquire_exclusive_locks() and mdl_try_acquire_exclusive_lock() are no longer responsible for removal of metadata lock requests from the context. One should explicitly call mdl_remove_all_locks() and mdl_remove_lock() to do this. Finally mdl_try_acquire_exclusive_lock() is now returs information about encountered lock conflict in separate out parameter since its return value is used for distinguishing between error (e.g. due to OOM) and success.	2009-12-02 19:15:40 +03:00
Konstantin Osipov	e8a9191e64	Backport of: ... ------------------------------------------------------------ revno: 2630.9.3 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w3 timestamp: Wed 2008-06-11 08:33:36 +0400 message: WL#3726 "DDL locking for all metadata objects". After review fixes in progress. Changed close_cached_tables() not to flush all unused TABLE instances when flushing individual table. Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal, rewrote its code to be more efficient. ****** Backport of: ------------------------------------------------------------ revno: 2630.9.4 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w3 timestamp: Wed 2008-06-11 15:53:53 +0400 message: WL#3726 "DDL locking for all metadata objects". After-review fixes in progress. Minor changes in order to improve code readability and simplify debugging. mysql-test/r/ps_ddl.result: Restore the original (correct) behaviour, now that the patch that fixes the regression introduced by the original patch for WL#3726 is fixed. mysql-test/t/ps_ddl.test: Restore the original (correct) behaviour, now that the patch that fixes the regression introduced by the original patch for WL#3726 is fixed sql/mysql_priv.h: Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal. sql/sql_base.cc: Changed close_cached_tables() not to flush all unused TABLE instances when flushing individual table. Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal, rewrote its code to be more efficient. As result removed relink_unused() function which is no longer used. ****** Improved code in close_cached_tables() according to reviewer's comments. sql/sql_delete.cc: Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal. sql/sql_rename.cc: Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal. sql/sql_show.cc: Moved acquisition of high-prio shared metadata lock in which happens in fill_schema_table_from_frm() to separate function. sql/sql_table.cc: Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal. sql/sql_trigger.cc: Renamed expel_table_from_cache() to tdc_remove_table() and added enum parameter to be able more explicitly specify type of removal.	2009-12-01 22:13:01 +03:00
Andrei Elkin	0eda48463c	Manual resolving for the following files ... Text conflict in mysql-test/collections/default.experimental Text conflict in mysql-test/r/show_check.result Text conflict in mysql-test/r/sp-code.result Text conflict in mysql-test/suite/binlog/r/binlog_tmp_table.result Text conflict in mysql-test/suite/rpl/t/disabled.def Text conflict in mysql-test/t/show_check.test Text conflict in mysys/my_delete.c Text conflict in sql/item.h Text conflict in sql/item_cmpfunc.h Text conflict in sql/log.cc Text conflict in sql/mysqld.cc Text conflict in sql/repl_failsafe.cc Text conflict in sql/slave.cc Text conflict in sql/sql_parse.cc Text conflict in sql/sql_table.cc Text conflict in sql/sql_yacc.yy Text conflict in storage/myisam/ha_myisam.cc Corrected results for stm_auto_increment_bug33029.reject 2009-12-01 20:01:49.000000000 +0300 <andrei> @@ -42,9 +42,6 @@ <andrei> RETURN i; <andrei> END// <andrei> CALL p1(); <andrei> -Warnings: <andrei> -Note 1592 Statement may not be safe to log in statement format. <andrei> -Note 1592 Statement may not be safe to log in statement format. There should be indeed no Note present because there is in fact autoincrement top-level query in sp() that triggers inserting in yet another auto-inc table. (todo: alert DaoGang to improve the test).	2009-12-01 21:07:18 +02:00
Konstantin Osipov	f7ba9dafd5	Backport of: ... ------------------------------------------------------------ revno: 2630.9.2 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w3 timestamp: Tue 2008-06-10 18:01:56 +0400 message: WL#3726 "DDL locking for all metadata objects". After review fixes in progress. sql/mdl.cc: Changed mdl_acquire_shared_lock() signature to accept MDL_CONTEXT as one of arguments as described in specification. sql/mdl.h: Changed mdl_acquire_shared_lock() signature to accept MDL_CONTEXT as one of arguments as described in specification. sql/sql_base.cc: Changed mdl_acquire_shared_lock() signature to accept MDL_CONTEXT as one of arguments as described in specification. Renamed handle_failed_open_table_attempt() to recover_from_failed_open_table_attempt() as suggested by review. Added comment clarifying why we need to check TABLE::db_stat while looking at TABLE instances open by other threads. sql/sql_show.cc: Changed mdl_acquire_shared_lock() signature to accept MDL_CONTEXT as one of arguments as described in specification.	2009-12-01 18:20:43 +03:00
Konstantin Osipov	d0a1f640db	Backport of: ... ------------------------------------------------------------ revno: 2630.4.24 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w2 timestamp: Fri 2008-06-06 14:28:58 +0400 message: WL#3726 "DDL locking for all metadata objects". After review fixes in progress. Get rid of upgradability and priority attributes of metadata lock requests by replacing them with two new types of lock requests MDL_SHARED_UPGRADABLE and MDL_SHARED_HIGH_PRIO correspondingly.	2009-12-01 16:59:11 +03:00
Konstantin Osipov	1480dafe2f	Backport of: ... ------------------------------------------------------------ revno: 2630.8.3 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w4 timestamp: Thu 2008-06-05 10:48:36 +0400 message: WL#3726 "DDL locking for all metadata objects". After-review fixes in progress. Adjust some comments that were using old terminology (name locks instead of exclusive metadata locks), brought some of them up-to-date with current situation in code. sql/sql_base.cc: Adjusted comments to use proper terminology. sql/sql_delete.cc: Adjusted comments to use proper terminology. sql/sql_handler.cc: Adjusted comments to use proper terminology. sql/sql_partition.cc: Adjusted comments to use proper terminology also fixed one comment to correspond to what really happens in code. sql/sql_show.cc: Adjusted comments to use proper terminology. sql/sql_table.cc: Adjusted comments to use proper terminology, brought one of them up-to-date with current situation. sql/sql_trigger.cc: Adjusted comments to use proper terminology. sql/table.h: Removed two unused members of TABLE_SHARE struct.	2009-12-01 16:51:50 +03:00
Konstantin Osipov	e23046d1bc	Backport of: ... ------------------------------------------------------------ revno: 2630.4.17 committer: Dmitry Lenev <dlenev@mysql.com> branch nick: mysql-6.0-3726-w2 timestamp: Thu 2008-05-29 16:52:56 +0400 message: WL#3726 "DDL locking for all metadata objects". After review fixes in progress. "The great correction of names". Renamed MDL_LOCK and MDL_LOCK_DATA classes to make usage of these names in metadata locking subsystem consistent with other parts of server (i.e. thr_lock.cc). Now we MDL_LOCK_DATA corresponds to request for a lock and MDL_LOCK to the lock itself. Adjusted code in MDL subsystem and other places using these classes accordingly. Did similar thing for GLOBAL_MDL_LOCK_DATA class and also changed name of its members to correspond to names of MDL_LOCK_DATA members. Finally got rid of usage of one letter variables in MDL code since it makes code harder to search in (according to reviewer).	2009-12-01 01:33:22 +03:00
unknown	db260b19e3	Merge MySQL 5.1.41 into MariaDB trunk, including a number of after-merge fixes. ... Also merge charset patch.	2009-11-30 22:37:27 +01:00