mariadb/mysql-test/include/handler.inc
Konstantin Osipov eff3780dd8 Initial import of WL#3726 "DDL locking for all metadata objects".
Backport of:
------------------------------------------------------------
revno: 2630.4.1
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w
timestamp: Fri 2008-05-23 17:54:03 +0400
message:
  WL#3726 "DDL locking for all metadata objects".

  After review fixes in progress.
------------------------------------------------------------

This is the first patch in series. It transforms the metadata 
locking subsystem to use a dedicated module (mdl.h,cc). No 
significant changes in the locking protocol. 
The import passes the test suite with the exception of 
deprecated/removed 6.0 features, and MERGE tables. The latter
are subject to a fix by WL#4144.
Unfortunately, the original changeset comments got lost in a merge,
thus this import has its own (largely insufficient) comments.

This patch fixes Bug#25144 "replication / binlog with view breaks".
Warning: this patch introduces an incompatible change:
Under LOCK TABLES, it's no longer possible to FLUSH a table that 
was not locked for WRITE.
Under LOCK TABLES, it's no longer possible to DROP a table or
VIEW that was not locked for WRITE.

******
Backport of:
------------------------------------------------------------
revno: 2630.4.2
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w
timestamp: Sat 2008-05-24 14:03:45 +0400
message:
  WL#3726 "DDL locking for all metadata objects".

  After review fixes in progress.

******
Backport of:
------------------------------------------------------------
revno: 2630.4.3
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w
timestamp: Sat 2008-05-24 14:08:51 +0400
message:
  WL#3726 "DDL locking for all metadata objects"

  Fixed failing Windows builds by adding mdl.cc to the lists
  of files needed to build server/libmysqld on Windows.

******
Backport of:
------------------------------------------------------------
revno: 2630.4.4
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w
timestamp: Sat 2008-05-24 21:57:58 +0400
message:
  WL#3726 "DDL locking for all metadata objects".

  Fix for assert failures in kill.test which occured when one
  tried to kill ALTER TABLE statement on merge table while it
  was waiting in wait_while_table_is_used() for other connections
  to close this table.

  These assert failures stemmed from the fact that cleanup code
  in this case assumed that temporary table representing new
  version of table was open with adding to THD::temporary_tables
  list while code which were opening this temporary table wasn't
  always fulfilling this.

  This patch changes code that opens new version of table to
  always do this linking in. It also streamlines cleanup process
  for cases when error occurs while we have new version of table
  open.

******
WL#3726 "DDL locking for all metadata objects"
Add libmysqld/mdl.cc to .bzrignore.
******
Backport of:
------------------------------------------------------------
revno: 2630.4.6
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w
timestamp: Sun 2008-05-25 00:33:22 +0400
message:
  WL#3726 "DDL locking for all metadata objects".

  Addition to the fix of assert failures in kill.test caused by
  changes for this worklog.


Make sure we close the new table only once.

.bzrignore:
  Add libmysqld/mdl.cc
libmysqld/CMakeLists.txt:
  Added mdl.cc to the list of files needed for building of libmysqld.
libmysqld/Makefile.am:
  Added files implementing new meta-data locking subsystem to the server.
mysql-test/include/handler.inc:
  Use separate connection for waiting while threads performing DDL
  operations conflicting with open HANDLER tables reach blocked
  state. This is required because now we check and close tables open
  by HANDLER statements in this connection conflicting with DDL in
  another each time open_tables() is called and thus select from I_S
  which is used for waiting will unblock DDL operations if issued
  from connection with open HANDLERs.
mysql-test/r/create.result:
  Adjusted test case after change in implementation of CREATE TABLE
  ... SELECT.  We no longer have special check in open_table() which
  catches the case when we select from the table created. Instead we
  rely on unique_table() call which happens after opening and
  locking all tables.
mysql-test/r/flush.result:
  FLUSH TABLES WITH READ LOCK can no longer happen under LOCK
  TABLES.  Updated test accordingly.
mysql-test/r/flush_table.result:
  Under LOCK TABLES we no longer allow to do FLUSH TABLES for tables
  locked for read. Updated test accordingly.
mysql-test/r/handler_innodb.result:
  Use separate connection for waiting while threads performing DDL
  operations conflicting with open HANDLER tables reach blocked
  state. This is required because now we check and close tables open
  by HANDLER statements in this connection conflicting with DDL in
  another each time open_tables() is called and thus select from I_S
  which is used for waiting will unblock DDL operations if issued
  from connection with open HANDLERs.
mysql-test/r/handler_myisam.result:
  Use separate connection for waiting while threads performing DDL
  operations conflicting with open HANDLER tables reach blocked
  state. This is required because now we check and close tables open
  by HANDLER statements in this connection conflicting with DDL in
  another each time open_tables() is called and thus select from I_S
  which is used for waiting will unblock DDL operations if issued
  from connection with open HANDLERs.
mysql-test/r/information_schema.result:
  Additional test for WL#3726 "DDL locking for all metadata
  objects".  Check that we use high-priority metadata lock requests
  when filling I_S tables.
  
  Rearrange tests to match 6.0 better (fewer merge conflicts).
mysql-test/r/kill.result:
  Added tests checking that DDL and DML statements waiting for
  metadata locks can be interrupted by KILL command.
mysql-test/r/lock.result:
  One no longer is allowed to do DROP VIEW under LOCK TABLES even if
  this view is locked by LOCK TABLES. The problem is that in such
  situation write locks on view are not mutually exclusive so
  upgrading metadata lock which is required for dropping of view
  will lead to deadlock.
mysql-test/r/partition_column_prune.result:
  Update results (same results in 6.0), WL#3726
mysql-test/r/partition_pruning.result:
  Update results (same results in 6.0), WL#3726
mysql-test/r/ps_ddl.result:
  We no longer invalidate prepared CREATE TABLE ... SELECT statement
  if target table changes. This is OK since it is not strictly
  necessary.
  
  
  The first change is wrong, is caused by FLUSH TABLE
  now flushing all unused tables. This is a regression that
  Dmitri fixed in 6.0 in a follow up patch.
mysql-test/r/sp.result:
  Under LOCK TABLES we no longer allow accessing views which were
  not explicitly locked. To access view we need to obtain metadata
  lock on it and doing this under LOCK TABLES may lead to deadlocks.
mysql-test/r/view.result:
  One no longer is allowed to do DROP VIEW under LOCK TABLES even if
  this view is locked by LOCK TABLES. The problem is that in such
  situation even "write locks" on view are not mutually exclusive so
  upgrading metadata lock which is required for dropping of view
  will lead to deadlock
mysql-test/r/view_grant.result:
  ALTER VIEW implementation was changed to open a view only after
  checking that user which does alter has appropriate privileges on
  it. This means that in case when user's privileges are
  insufficient for this we won't check that new view definer is the
  same as original one or user performing alter has SUPER privilege.
  Adjusted test case accordingly.
mysql-test/r/view_multi.result:
  Added test case for bug#25144 "replication / binlog with view
  breaks".
mysql-test/suite/rpl/t/disabled.def:
  Disable test for deprecated features (they don't work with new MDL).
mysql-test/t/create.test:
  Adjusted test case after change in implementation of CREATE TABLE
  ... SELECT.  We no longer have special check in open_table() which
  catches the case when we select from the table created. Instead we
  rely on unique_table() call which happens after opening and
  locking all tables.
mysql-test/t/disabled.def:
  Disable merge.test, subject of WL#4144
mysql-test/t/flush.test:
  
  FLUSH TABLES WITH READ LOCK can no longer happen under LOCK
  TABLES.  Updated test accordingly.
mysql-test/t/flush_table.test:
  Under LOCK TABLES we no longer allow to do FLUSH TABLES for tables
  locked for read. Updated test accordingly.
mysql-test/t/information_schema.test:
  Additional test for WL#3726 "DDL locking for all metadata
  objects".  Check that we use high-priority metadata lock requests
  when filling I_S tables.
  
  Rearrange the results for easier merges with 6.0.
mysql-test/t/kill.test:
  Added tests checking that DDL and DML statements waiting for
  metadata locks can be interrupted by KILL command.
mysql-test/t/lock.test:
  One no longer is allowed to do DROP VIEW under LOCK TABLES even if
  this view is locked by LOCK TABLES. The problem is that in such
  situation write locks on view are not mutually exclusive so
  upgrading metadata lock which is required for dropping of view
  will lead to deadlock.
mysql-test/t/lock_multi.test:
  Adjusted test case to the changes of status in various places
  caused by change in implementation FLUSH TABLES WITH READ LOCK,
  which is now takes global metadata lock before flushing tables and
  therefore waits on at these places.
mysql-test/t/ps_ddl.test:
  We no longer invalidate prepared CREATE TABLE ... SELECT statement
  if target table changes. This is OK since it is not strictly
  necessary.
  
  
  The first change is wrong, is caused by FLUSH TABLE
  now flushing all unused tables. This is a regression that
  Dmitri fixed in 6.0 in a follow up patch.
mysql-test/t/sp.test:
  Under LOCK TABLES we no longer allow accessing views which were
  not explicitly locked. To access view we need to obtain metadata
  lock on it and doing this under LOCK TABLES may lead to deadlocks.
mysql-test/t/trigger_notembedded.test:
  Adjusted test case to the changes of status in various places
  caused by change in implementation FLUSH TABLES WITH READ LOCK,
  which is now takes global metadata lock before flushing tables and
  therefore waits on at these places.
mysql-test/t/view.test:
  One no longer is allowed to do DROP VIEW under LOCK TABLES even if
  this view is locked by LOCK TABLES. The problem is that in such
  situation even "write locks" on view are not mutually exclusive so
  upgrading metadata lock which is required for dropping of view
  will lead to deadlock.
mysql-test/t/view_grant.test:
  ALTER VIEW implementation was changed to open a view only after
  checking that user which does alter has appropriate privileges on
  it. This means that in case when user's privileges are
  insufficient for this we won't check that new view definer is the
  same as original one or user performing alter has SUPER privilege.
  Adjusted test case accordingly.
mysql-test/t/view_multi.test:
  Added test case for bug#25144 "replication / binlog with view
  breaks".
sql/CMakeLists.txt:
  Added mdl.cc to the list of files needed for building of server.
sql/Makefile.am:
  Added files implementing new meta-data locking subsystem to the
  server.
sql/event_db_repository.cc:
  
  Allocate metadata lock requests objects (MDL_LOCK) on execution
  memory root in cases when TABLE_LIST objects is also allocated
  there or on stack.
sql/ha_ndbcluster.cc:
  Adjusted code to work nicely with new metadata locking subsystem.
  close_cached_tables() no longer has wait_for_placeholder argument.
  Instead of relying on this parameter and related behavior FLUSH
  TABLES WITH READ LOCK now takes global shared metadata lock.
sql/ha_ndbcluster_binlog.cc:
  Adjusted code to work with new metadata locking subsystem.
  close_cached_tables() no longer has wait_for_placeholder argument.
  Instead of relying on this parameter and related behavior FLUSH
  TABLES WITH READ LOCK now takes global shared metadata lock.
sql/handler.cc:
  update_frm_version():
    Directly update TABLE_SHARE::mysql_version member instead of
    going through all TABLE instances for this table (old code was a
    legacy from pre-table-definition-cache days).
sql/lock.cc:
  Use new metadata locking subsystem. Threw away most of functions
  related to name locking as now one is supposed to use metadata
  locking API instead.  In lock_global_read_lock() and
  unlock_global_read_lock() in order to avoid problems with global
  read lock sneaking in at the moment when we perform FLUSH TABLES
  or ALTER TABLE under LOCK TABLES and when tables being reopened
  are protected only by metadata locks we also have to take global
  shared meta data lock.
sql/log_event.cc:
  Adjusted code to work with new metadata locking subsystem.  For
  tables open by slave thread for applying RBR events allocate
  memory for lock request object in the same chunk of memory as
  TABLE_LIST objects for them. In order to ensure that we keep these
  objects around until tables are open always close tables before
  calling Relay_log_info::clear_tables_to_lock(). Use new auxiliary
  Relay_log_info::slave_close_thread_tables() method to enforce
  this.
sql/log_event_old.cc:
  Adjusted code to work with new metadata locking subsystem.  Since
  for tables open by slave thread for applying RBR events memory for
  lock request object is allocated in the same chunk of memory as
  TABLE_LIST objects for them we have to ensure that we keep these
  objects around until tables are open. To ensure this we always
  close tables before calling
  Relay_log_info::clear_tables_to_lock(). To enfore this we use
  new auxiliary Relay_log_info::slave_close_thread_tables()
  method.
sql/mdl.cc:
  Implemented new metadata locking subsystem and API described in
  WL3726 "DDL locking for all metadata objects".
sql/mdl.h:
  Implemented new metadata locking subsystem and API described in
  WL3726 "DDL locking for all metadata objects".
sql/mysql_priv.h:
  - close_thread_tables()/close_tables_for_reopen() now has one more
    argument which indicates that metadata locks should be released
    but not removed from the context in order to be used later in
    mdl_wait_for_locks() and tdc_wait_for_old_version().
  - close_cached_table() routine is no longer public.
  - Thread waiting in wait_while_table_is_used() can be now killed
    so this function returns boolean to make caller aware of such
    situation.
  - We no longer have  table cache as separate entity instead used
    and unused TABLE instances are linked to TABLE_SHARE objects in
    table definition cache.
  - Now third argument of open_table() is also used for requesting
    table repair or auto-discovery of table's new definition. So its
    type was changed from bool to enum.
  - Added tdc_open_view() function for opening view by getting its
    definition from disk (and table cache in future).
  - reopen_name_locked_table() no longer needs "link_in" argument as
    now we have exclusive metadata locks instead of dummy TABLE
    instances when this function is called.
  - find_locked_table() now takes head of list of TABLE instances
    instead of always scanning through THD::open_tables list. Also
    added find_write_locked_table() auxiliary.
  - reopen_tables(), close_cached_tables() no longer have
    mark_share_as_old and wait_for_placeholder arguments. Instead of
    relying on this parameters and related behavior FLUSH TABLES
    WITH READ LOCK now takes global shared metadata lock.
  - We no longer need drop_locked_tables() and
    abort_locked_tables().
  - mysql_ha_rm_tables() now always assume that LOCK_open is not
    acquired by caller.
  - Added notify_thread_having_shared_lock() callback invoked by
    metadata locking subsystem when acquiring an exclusive lock, for
    each thread that has a conflicting shared metadata lock.
  - Introduced expel_table_from_cache() as replacement for
    remove_table_from_cache() (the main difference is that this new
    function assumes that caller follows metadata locking protocol
    and never waits).
  - Threw away most of functions related to name locking. One should
    use new metadata locking subsystem and API instead.
sql/mysqld.cc:
  Got rid of call initializing/deinitializing table cache since now
  it is embedded into table definition cache. Added calls for
  initializing/ deinitializing metadata locking subsystem.
sql/rpl_rli.cc:
  Introduced auxiliary Relay_log_info::slave_close_thread_tables()
  method which is used for enforcing that we always close tables
  open for RBR before deallocating TABLE_LIST elements and MDL_LOCK
  objects for them.
sql/rpl_rli.h:
  Introduced auxiliary Relay_log_info::slave_close_thread_tables()
  method which is used for enforcing that we always close tables
  open for RBR before deallocating TABLE_LIST elements and MDL_LOCK
  objects for them.
sql/set_var.cc:
  close_cached_tables() no longer has wait_for_placeholder argument.
  Instead of relying on this parameter and related behavior FLUSH
  TABLES WITH READ LOCK now takes global shared metadata lock.
sql/sp_head.cc:
  For tables added to the statement's table list by prelocking
  algorithm we allocate these objects either on the same memory as
  corresponding table list elements or on THD::locked_tables_root
  (if we are building table list for LOCK TABLES).
sql/sql_acl.cc:
  Allocate metadata lock requests objects (MDL_LOCK) on execution
  memory root in cases when we use stack TABLE_LIST objects to open
  tables.  Got rid of redundant code by using unlock_locked_tables()
  function.
sql/sql_base.cc:
  Changed code to use new MDL subsystem. Got rid of separate table
  cache.  Now used and unused TABLE instances are linked to the
  TABLE_SHAREs in table definition cache.
  
  check_unused():
    Adjusted code to the fact that we no longer have separate table
    cache.  Removed dead code.
  table_def_free():
    Free TABLE instances referenced from TABLE_SHARE objects before
    destroying table definition cache.
  get_table_share():
    Added assert which ensures that noone will be able to access
    table (and its share) without acquiring some kind of metadata
    lock first.
  close_handle_and_leave_table_as_lock():
    Adjusted code to the fact that TABLE instances now are linked to
    list in TABLE_SHARE.
  list_open_tables():
    Changed this function to use table definition cache instead of
    table cache.
  free_cache_entry():
    Unlink freed TABLE elements from the list of all TABLE instances
    for the table in TABLE_SHARE.
  kill_delayed_thread_for_table():
    Added auxiliary for killing delayed insert threads for
    particular table.
  close_cached_tables():
    Got rid of wait_for_refresh argument as we now rely on global
    shared metadata lock to prevent FLUSH WITH READ LOCK sneaking in
    when we are reopening tables. Heavily reworked this function to
    use new MDL code and not to rely on separate table cache entity.
  close_open_tables():
    We no longer have separate table cache.
  close_thread_tables():
    Release metadata locks after closing all tables. Added skip_mdl
    argument which allows us not to remove metadata lock requests
    from the context in case when we are going to use this requests
    later in mdl_wait_for_locks() and tdc_wait_for_old_versions().
  close_thread_table()/close_table_for_reopen():
    Since we no longer have separate table cache and all TABLE
    instances are linked to TABLE_SHARE objects in table definition
    cache we have to link/unlink TABLE object to/from appropriate
    lists in the share.
  name_lock_locked_table():
   Moved redundant code to find_write_locked_table() function and
    adjusted code to the fact that wait_while_table_is_used() can
    now return with an error if our thread is killed.
  reopen_table_entry():
    We no longer need "link_in" argument as with MDL we no longer
    call this function with dummy TABLE object pre-allocated and
    added to the THD::open_tables. Also now we add newly-open TABLE
    instance to the list of share's used TABLE instances.
  table_cache_insert_placeholder():
    Got rid of name-locking legacy.
  lock_table_name_if_not_cached():
    Moved to sql_table.cc the only place where it is used. It was
    also reimplemented using new MDL API.
  open_table():
    - Reworked this function to use new MDL subsystem.
    - Changed code to deal with table definition cache directly
      instead of going through separate table cache.
    - Now third argument is also used for requesting table repair
      or auto-discovery of table's new definition. So its type was
      changed from bool to enum.
  find_locked_table()/find_write_locked_table():
    Accept head of list of TABLE objects as first argument and use
    this list instead of always searching in THD::open_tables list.
    Also added auxiliary for finding write-locked locked tables.
  reopen_table():
    Adjusted function to work with new MDL subsystem and to properly
    manuipulate with lists of used/unused TABLE instaces in
    TABLE_SHARE.
  reopen_tables():
    Removed mark_share_as_old parameter. Instead of relying on it
    and related behavior FLUSH TABLES WITH READ LOCK now takes
    global shared metadata lock. Changed code after removing
    separate table cache.
  drop_locked_tables()/abort_locked_tables():
    Got rid of functions which are no longer needed.
    unlock_locked_tables():
    Moved this function from sql_parse.cc and changed it to release
    memory which was used for allocating metadata lock requests for
    tables open and locked by LOCK TABLES.
  tdc_open_view():
    Intoduced function for opening a view by getting its definition
    from disk (and table cache in future).
  reopen_table_entry():
    Introduced function for opening table definitions while holding
    exclusive metatadata lock on it.
  open_unireg_entry():
   Got rid of this function. Most of its functionality is relocated
    to open_table() and open_table_fini() functions, and some of it
    to reopen_table_entry() and tdc_open_view(). Also code
    resposible for auto-repair and auto-discovery of tables was
    moved to separate function.
  open_table_entry_fini():
    Introduced function which contains common actions which finalize
    process of TABLE object creation.
  auto_repair_table():
    Moved code responsible for auto-repair of table being opened
    here.
  handle_failed_open_table_attempt()
    Moved code responsible for handling failing attempt to open
    table to one place (retry due to lock conflict/old version,
    auto-discovery and repair).
  open_tables():
    - Flush open HANDLER tables if they have old version of if there
      is conflicting metadata lock against them (before this moment
      we had this code in open_table()).
    - When we open view which should be processed via derived table
      on the second execution of prepared statement or stored
      routine we still should call open_table() for it in order to
      obtain metadata lock on it and prepare its security context.
    - In cases when we discover that some special handling of
      failure to open table is needed call
      handle_failed_open_table_attempt() which handles all such
      scenarios.
  open_ltable():
    Handling of various special scenarios of failure to open a table
    was moved to separate handle_failed_open_table_attempt()
    function.
  remove_db_from_cache():
    Removed this function as it is no longer used.
  notify_thread_having_shared_lock():
    Added callback which is invoked by MDL subsystem when acquiring
    an exclusive lock, for each thread that has a conflicting shared
    metadata lock.
  expel_table_from_cache():
    Introduced function for removing unused TABLE instances. Unlike
    remove_table_from_cache() it relies on caller following MDL
    protocol and having appropriate locks when calling it and thus
    does not do any waiting if table is still in use.
  tdc_wait_for_old_version():
    Added function which allows open_tables() to wait in cases when
    we discover that we should back-off due to presence of old
    version of table.
  abort_and_upgrade_lock():
    Use new MDL calls.
  mysql_wait_completed_table():
    Got rid of unused function.
  open_system_tables_for_read/for_update()/performance_schema_table():
    Allocate MDL_LOCK objects on execution memory root in cases when
    TABLE_LIST objects for corresponding tables is allocated on
    stack.
  close_performance_schema_table():
    Release metadata locks after closing tables.
  ******
  Use I_P_List for free/used tables list in the table share.
sql/sql_binlog.cc:
  Use Relay_log_info::slave_close_thread_tables() method to enforce
  that we always close tables open for RBR before deallocating
  TABLE_LIST elements and MDL_LOCK objects for them.
sql/sql_class.cc:
  Added meta-data locking contexts as part of Open_tables_state
  context.  Also introduced THD::locked_tables_root memory root
  which is to be used for allocating MDL_LOCK objects for tables in
  LOCK TABLES statement (end of lifetime for such objects is UNLOCK
  TABLES so we can't use statement or execution root for them).
sql/sql_class.h:
  Added meta-data locking contexts as part of Open_tables_state
  context.  Also introduced THD::locked_tables_root memory root
  which is to be used for allocating MDL_LOCK objects for tables in
  LOCK TABLES statement (end of lifetime for such objects is UNLOCK
  TABLES so we can't use statement or execution root for them).
  
  Note: handler_mdl_context and locked_tables_root and
  mdl_el_root will be removed by subsequent patches.
sql/sql_db.cc:
  mysql_rm_db() does not really need to call remove_db_from_cache()
  as it drops each table in the database using
  mysql_rm_table_part2(), which performs all necessary operations on
  table (definition) cache.
sql/sql_delete.cc:
  Use the new metadata locking API for TRUNCATE.
sql/sql_handler.cc:
  Changed HANDLER implementation to use new metadata locking
  subsystem.  Note that MDL_LOCK objects for HANDLER tables are
  allocated in the same chunk of heap memory as TABLE_LIST object
  for those tables.
sql/sql_insert.cc:
  mysql_insert():
    find_locked_table() now takes head of list of TABLE object as
    its argument instead of always scanning through THD::open_tables
    list.
  handle_delayed_insert():
    Allocate metadata lock request object for table open by delayed
    insert thread on execution memroot.  create_table_from_items():
    We no longer allocate dummy TABLE objects for tables being
    created if they don't exist. As consequence
    reopen_name_locked_table() no longer has link_in argument.
    open_table() now has one more argument which is not relevant for
    temporary tables.
sql/sql_parse.cc:
  - Moved unlock_locked_tables() routine to sql_base.cc and made
    available it in other files. Got rid of some redundant code by
    using this function.
  - Replaced boolean TABLE_LIST::create member with enum
    open_table_type member.
  - Use special memory root for allocating MDL_LOCK objects for
    tables open and locked by LOCK TABLES (these object should live
    till UNLOCK TABLES so we can't allocate them on statement nor
    execution memory root). Also properly set metadata lock
    upgradability attribure for those tables.
  - Under LOCK TABLES it is no longer allowed to flush tables which
    are not write-locked as this breaks metadata locking protocol
    and thus potentially might lead to deadlock.
  - Added auxiliary adjust_mdl_locks_upgradability() function.
sql/sql_partition.cc:
  Adjusted code to the fact that reopen_tables() no longer has
  "mark_share_as_old" argument. Got rid of comments which are no
  longer true.
sql/sql_plist.h:
  Added I_P_List template class for parametrized intrusive doubly
  linked lists and I_P_List_iterator for corresponding iterator.
  Unlike for I_List<> list elements of such list can participate in
  several lists. Unlike List<> such lists are doubly-linked and
  intrusive.
sql/sql_plugin.cc:
  Allocate metadata lock requests objects (MDL_LOCK) on execution
  memory root in cases when we use stack TABLE_LIST objects to open
  tables.
sql/sql_prepare.cc:
  Replaced boolean TABLE_LIST::create member with enum
  open_table_type member.  This allows easily handle situation in
  which instead of opening the table we want only to take exclusive
  metadata lock on it.
sql/sql_rename.cc:
  Use new metadata locking subsystem in implementation of RENAME
  TABLE.
sql/sql_servers.cc:
  Allocate metadata lock requests objects (MDL_LOCK) on execution
  memory root in cases when we use stack TABLE_LIST objects to open
  tables. Got rid of redundant code by using unlock_locked_tables()
  function.
sql/sql_show.cc:
  Acquire shared metadata lock when we are getting information for
  I_S table directly from TABLE_SHARE without doing full-blown table
  open.  We use high priority lock request in this situation in
  order to avoid deadlocks.
  Also allocate metadata lock requests objects (MDL_LOCK) on
  execution memory root in cases when TABLE_LIST objects are also
  allocated there
sql/sql_table.cc:
  mysql_rm_table():
    Removed comment which is no longer relevant.
  mysql_rm_table_part2():
    Now caller of mysql_ha_rm_tables() should not own LOCK_open.
    Adjusted code to use new metadata locking subsystem instead of
    name-locks.
  lock_table_name_if_not_cached():
    Moved this function from sql_base.cc to this file and
    reimplemented it using metadata locking API.
  mysql_create_table():
    Adjusted code to use new MDL API.
  wait_while_table_is_used():
    Changed function to use new MDL subsystem. Made thread waiting
    in it killable (this also led to introduction of return value so
    caller can distinguish successful executions from situations
    when waiting was aborted).
  close_cached_tables():
    Thread waiting in this function is killable now. As result it
    has return value for distinguishing between succes and failure.
    Got rid of redundant boradcast_refresh() call.
  prepare_for_repair():
    Use MDL subsystem instead of name-locks.
  mysql_admin_table():
    mysql_ha_rm_tables() now always assumes that caller doesn't own
    LOCK_open.
  mysql_repair_table():
    We should mark all elements of table list as requiring
    upgradable metadata locks.
  mysql_create_table_like():
    Use new MDL subsystem instead of name-locks.
  create_temporary_tables():
    We don't need to obtain metadata locks when creating temporary
    table.
  mysql_fast_or_online_alter_table():
    Thread waiting in wait_while_table_is_used() is now killable.
  mysql_alter_table():
    Adjusted code to work with new MDL subsystem and to the fact
    that threads waiting in what_while_table_is_used() and
    close_cached_table() are now killable.
sql/sql_test.cc:
  We no longer have separate table cache. TABLE instances are now
  associated with/linked to TABLE_SHARE objects in table definition
  cache.
sql/sql_trigger.cc:
  Adjusted code to work with new metadata locking subsystem.  Also
  reopen_tables() no longer has mark_share_as_old argument (Instead
  of relying on this parameter and related behavior FLUSH TABLES
  WITH READ LOCK now takes global shared metadata lock).
sql/sql_udf.cc:
  Allocate metadata lock requests objects (MDL_LOCK) on execution
  memory root in cases when we use stack TABLE_LIST objects to open
  tables.
sql/sql_update.cc:
  Adjusted code to work with new meta-data locking subsystem.
sql/sql_view.cc:
  Added proper meta-data locking to implementations of
  CREATE/ALTER/DROP VIEW statements. Now we obtain exclusive
  meta-data lock on a view before creating/ changing/dropping it.
  This ensures that all concurrent statements that use this view
  will finish before our statement will proceed and therefore we
  will get correct order of statements in the binary log.
  Also ensure that TABLE_LIST::mdl_upgradable attribute is properly
  propagated for underlying tables of view.
sql/table.cc:
  Added auxiliary alloc_mdl_locks() function for allocating metadata
  lock request objects for all elements of table list.
sql/table.h:
  TABLE_SHARE:
    Got rid of unused members. Introduced members for storing lists
    of used and unused TABLE objects for this share.
  TABLE:
    Added members for linking TABLE objects into per-share lists of
    used and unused TABLE instances. Added member for holding
    pointer to metadata lock for this table.
  TABLE_LIST:
    Replaced boolean TABLE_LIST::create member with enum
    open_table_type member.  This allows easily handle situation in
    which instead of opening the table we want only to take
    exclusive meta-data lock on it (we need this in order to handle
    ALTER VIEW and CREATE VIEW statements).
    Introduced new mdl_upgradable member for marking elements of
    table list for which we need to take upgradable shared metadata
    lock instead of plain shared metadata lock.  Added pointer for
    holding pointer to MDL_LOCK for the table.
  Added auxiliary alloc_mdl_locks() function for allocating metadata
  lock requests objects for all elements of table list.  Added
  auxiliary set_all_mdl_upgradable() function for marking all
  elements in table list as requiring upgradable metadata locks.
storage/myisammrg/ha_myisammrg.cc:
  Allocate MDL_LOCK objects for underlying tables of MERGE table.
  To be reworked once Ingo pushes his patch for WL4144.
2009-11-30 18:55:03 +03:00

750 lines
18 KiB
PHP

# include/handler.inc
#
# The variables
# $engine_type -- storage engine to be tested
# $other_engine_type -- storage engine <> $engine_type
# $other_handler_engine_type -- storage engine <> $engine_type, if possible
# 1. $other_handler_engine_type must support handler
# 2. $other_handler_engine_type must point to an all
# time available storage engine
# 2006-08 MySQL 5.1 MyISAM and MEMORY only
# have to be set before sourcing this script.
-- source include/not_embedded.inc
#
# test of HANDLER ...
#
# Last update:
# 2006-07-31 ML test refactored (MySQL 5.1)
# code of t/handler.test and t/innodb_handler.test united
# main testing code put into include/handler.inc
#
eval SET SESSION STORAGE_ENGINE = $engine_type;
--disable_warnings
drop table if exists t1,t3,t4,t5;
--enable_warnings
create table t1 (a int, b char(10), key a(a), key b(a,b));
insert into t1 values
(17,"ddd"),(18,"eee"),(19,"fff"),(19,"yyy"),
(14,"aaa"),(15,"bbb"),(16,"ccc"),(16,"xxx"),
(20,"ggg"),(21,"hhh"),(22,"iii");
handler t1 open as t2;
-- error 1064
handler t2 read a=(SELECT 1);
handler t2 read a first;
handler t2 read a next;
handler t2 read a next;
handler t2 read a prev;
handler t2 read a last;
handler t2 read a prev;
handler t2 read a prev;
handler t2 read a first;
handler t2 read a prev;
handler t2 read a last;
handler t2 read a prev;
handler t2 read a next;
handler t2 read a next;
handler t2 read a=(15);
handler t2 read a=(16);
--error 1070
handler t2 read a=(19,"fff");
handler t2 read b=(19,"fff");
handler t2 read b=(19,"yyy");
handler t2 read b=(19);
--error 1109
handler t1 read a last;
handler t2 read a=(11);
handler t2 read a>=(11);
handler t2 read a=(18);
handler t2 read a>=(18);
handler t2 read a>(18);
handler t2 read a<=(18);
handler t2 read a<(18);
handler t2 read a first limit 5;
handler t2 read a next limit 3;
handler t2 read a prev limit 10;
handler t2 read a>=(16) limit 4;
handler t2 read a>=(16) limit 2,2;
handler t2 read a last limit 3;
handler t2 read a=(19);
handler t2 read a=(19) where b="yyy";
handler t2 read first;
handler t2 read next;
handler t2 read next;
--error 1064
handler t2 read last;
handler t2 close;
handler t1 open;
handler t1 read a next; # this used to crash as a bug#5373
handler t1 read a next;
handler t1 close;
handler t1 open;
handler t1 read a prev; # this used to crash as a bug#5373
handler t1 read a prev;
handler t1 close;
handler t1 open as t2;
handler t2 read first;
eval alter table t1 engine = $engine_type;
--error 1109
handler t2 read first;
#
# DROP TABLE / ALTER TABLE
#
handler t1 open as t2;
drop table t1;
create table t1 (a int);
insert into t1 values (17);
--error 1109
handler t2 read first;
handler t1 open as t2;
eval alter table t1 engine=$other_engine_type;
--error 1109
handler t2 read first;
drop table t1;
#
# Test case for the bug #787
#
create table t1 (a int);
insert into t1 values (1),(2),(3),(4),(5),(6);
delete from t1 limit 2;
handler t1 open;
handler t1 read first;
handler t1 read first limit 1,1;
handler t1 read first limit 2,2;
delete from t1 limit 3;
handler t1 read first;
drop table t1;
#
# Test for #751
#
create table t1(a int, index(a));
insert into t1 values (1), (2), (3);
handler t1 open;
--error 1054
handler t1 read a=(W);
--error 1210
handler t1 read a=(a);
drop table t1;
#
# BUG#2304
#
create table t1 (a char(5));
insert into t1 values ("Ok");
handler t1 open as t;
handler t read first;
use mysql;
handler t read first;
handler t close;
handler test.t1 open as t;
handler t read first;
handler t close;
use test;
drop table t1;
#
# BUG#3649
#
create table t1 ( a int, b int, INDEX a (a) );
insert into t1 values (1,2), (2,1);
handler t1 open;
handler t1 read a=(1) where b=2;
handler t1 read a=(1) where b=3;
handler t1 read a=(1) where b=1;
handler t1 close;
drop table t1;
#
# Check if two database names beginning the same are seen as different.
#
# This database begins like the usual 'test' database.
#
--disable_warnings
drop database if exists test_test;
--enable_warnings
create database test_test;
use test_test;
create table t1(table_id char(20) primary key);
insert into t1 values ('test_test.t1');
insert into t1 values ('');
handler t1 open;
handler t1 read first limit 9;
create table t2(table_id char(20) primary key);
insert into t2 values ('test_test.t2');
insert into t2 values ('');
handler t2 open;
handler t2 read first limit 9;
#
# This is the usual 'test' database.
#
use test;
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1(table_id char(20) primary key);
insert into t1 values ('test.t1');
insert into t1 values ('');
--error 1066
handler t1 open;
#
# Check accesibility of all the tables.
#
use test;
--error 1064
handler test.t1 read first limit 9;
--error 1064
handler test_test.t1 read first limit 9;
handler t1 read first limit 9;
--error 1064
handler test_test.t2 read first limit 9;
handler t2 read first limit 9;
#
# Cleanup.
#
--error 1064
handler test_test.t1 close;
handler t1 close;
drop table test_test.t1;
--error 1064
handler test_test.t2 close;
handler t2 close;
drop table test_test.t2;
drop database test_test;
#
use test;
--error 1064
handler test.t1 close;
--error 1109
handler t1 close;
drop table test.t1;
#
# BUG#4335
#
--disable_warnings
drop database if exists test_test;
drop table if exists t1;
drop table if exists t2;
drop table if exists t3;
--enable_warnings
create database test_test;
use test_test;
create table t1 (c1 char(20));
insert into t1 values ('test_test.t1');
create table t3 (c1 char(20));
insert into t3 values ('test_test.t3');
handler t1 open;
handler t1 read first limit 9;
handler t1 open h1;
handler h1 read first limit 9;
use test;
create table t1 (c1 char(20));
create table t2 (c1 char(20));
create table t3 (c1 char(20));
insert into t1 values ('t1');
insert into t2 values ('t2');
insert into t3 values ('t3');
--error 1066
handler t1 open;
--error 1066
handler t2 open t1;
--error 1066
handler t3 open t1;
handler t1 read first limit 9;
--error 1064
handler test.t1 close;
--error 1066
handler test.t1 open h1;
--error 1066
handler test_test.t1 open h1;
handler test_test.t3 open h3;
handler test.t1 open h2;
handler t1 read first limit 9;
handler h1 read first limit 9;
handler h2 read first limit 9;
handler h3 read first limit 9;
handler h2 read first limit 9;
--error 1064
handler test.h1 close;
handler t1 close;
handler h1 close;
handler h2 close;
--error 1109
handler t1 read first limit 9;
--error 1109
handler h1 read first limit 9;
--error 1109
handler h2 read first limit 9;
handler h3 read first limit 9;
handler h3 read first limit 9;
use test_test;
handler h3 read first limit 9;
--error 1064
handler test.h3 read first limit 9;
handler h3 close;
use test;
drop table t3;
drop table t2;
drop table t1;
drop database test_test;
#
# Test if fix for BUG#4286 correctly closes handler tables.
#
create table t1 (c1 char(20));
insert into t1 values ("t1");
handler t1 open as h1;
handler h1 read first limit 9;
create table t2 (c1 char(20));
insert into t2 values ("t2");
handler t2 open as h2;
handler h2 read first limit 9;
create table t3 (c1 char(20));
insert into t3 values ("t3");
handler t3 open as h3;
handler h3 read first limit 9;
create table t4 (c1 char(20));
insert into t4 values ("t4");
handler t4 open as h4;
handler h4 read first limit 9;
create table t5 (c1 char(20));
insert into t5 values ("t5");
handler t5 open as h5;
handler h5 read first limit 9;
# close first
eval alter table t1 engine=$other_handler_engine_type;
--error 1109
handler h1 read first limit 9;
handler h2 read first limit 9;
handler h3 read first limit 9;
handler h4 read first limit 9;
handler h5 read first limit 9;
# close last
eval alter table t5 engine=$other_handler_engine_type;
--error 1109
handler h1 read first limit 9;
handler h2 read first limit 9;
handler h3 read first limit 9;
handler h4 read first limit 9;
--error 1109
handler h5 read first limit 9;
# close middle
eval alter table t3 engine=$other_handler_engine_type;
--error 1109
handler h1 read first limit 9;
handler h2 read first limit 9;
--error 1109
handler h3 read first limit 9;
handler h4 read first limit 9;
--error 1109
handler h5 read first limit 9;
handler h2 close;
handler h4 close;
# close all depending handler tables
handler t1 open as h1_1;
handler t1 open as h1_2;
handler t1 open as h1_3;
handler h1_1 read first limit 9;
handler h1_2 read first limit 9;
handler h1_3 read first limit 9;
eval alter table t1 engine=$engine_type;
--error 1109
handler h1_1 read first limit 9;
--error 1109
handler h1_2 read first limit 9;
--error 1109
handler h1_3 read first limit 9;
drop table t1;
drop table t2;
drop table t3;
drop table t4;
drop table t5;
#
# Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
#
create table t1 (c1 int);
insert into t1 values (1);
# client 1
handler t1 open;
handler t1 read first;
# client 2
connect (con2,localhost,root,,);
connection con2;
--exec echo send the below to another connection, do not wait for the result
send optimize table t1;
--sleep 1
# client 1
--exec echo proceed with the normal connection
connection default;
handler t1 read next;
handler t1 close;
# client 2
--exec echo read the result from the other connection
connection con2;
reap;
# client 1
--exec echo proceed with the normal connection
connection default;
drop table t1;
CREATE TABLE t1 ( no1 smallint(5) NOT NULL default '0', no2 int(10) NOT NULL default '0', PRIMARY KEY (no1,no2));
INSERT INTO t1 VALUES (1,274),(1,275),(2,6),(2,8),(4,1),(4,2);
HANDLER t1 OPEN;
HANDLER t1 READ `primary` = (1, 1000);
HANDLER t1 READ `primary` PREV;
DROP TABLE t1;
# End of 4.1 tests
#
# Addendum to Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
# Show that DROP TABLE can no longer deadlock against
# FLUSH TABLES WITH READ LOCK. This is a 5.0 issue.
#
create table t1 (c1 int);
insert into t1 values (14397);
flush tables with read lock;
# The thread with the global read lock cannot drop the table itself:
--error 1223
drop table t1;
#
# client 2
# We need a second connection to try the drop.
# The drop waits for the global read lock to go away.
# Without the addendum fix it locked LOCK_open before entering the wait loop.
connection con2;
--exec echo send the below to another connection, do not wait for the result
send drop table t1;
--sleep 1
#
# client 1
# Now we need something that wants LOCK_open. A simple table access which
# opens the table does the trick.
--exec echo proceed with the normal connection
connection default;
# This would hang on LOCK_open without the 5.0 addendum fix.
select * from t1;
# Release the read lock. This should make the DROP go through.
unlock tables;
#
# client 2
# Read the result of the drop command.
connection con2;
--exec echo read the result from the other connection
reap;
#
# client 1
# Now back to normal operation. The table should not exist any more.
--exec echo proceed with the normal connection
connection default;
--error 1146
select * from t1;
# Just to be sure and not confuse the next test case writer.
drop table if exists t1;
#
# Bug#25856 - HANDLER table OPEN in one connection lock DROP TABLE in another one
#
--disable_warnings
drop table if exists t1;
--enable_warnings
eval create table t1 (a int) ENGINE=$other_engine_type;
--echo --> client 2
connection con2;
--error 1031
handler t1 open;
--echo --> client 1
connection default;
drop table t1;
disconnect con2;
#
# Bug#30632 HANDLER read failure causes hang
#
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (a int);
handler t1 open as t1_alias;
--error 1176
handler t1_alias read a next;
--error 1054
handler t1_alias READ a next where inexistent > 0;
--error 1176
handler t1_alias read a next;
--error 1054
handler t1_alias READ a next where inexistent > 0;
handler t1_alias close;
drop table t1;
#
# Bug#21587 FLUSH TABLES causes server crash when used with HANDLER statements
#
--disable_warnings
drop table if exists t1,t2;
--enable_warnings
create table t1 (c1 int);
create table t2 (c1 int);
insert into t1 values (1);
insert into t2 values (2);
--echo connection: default
handler t1 open;
handler t1 read first;
connect (flush,localhost,root,,);
connection flush;
--echo connection: flush
--send flush tables;
connect (waiter,localhost,root,,);
connection waiter;
--echo connection: waiter
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Flushing tables";
--source include/wait_condition.inc
connection default;
--echo connection: default
handler t2 open;
handler t2 read first;
handler t1 read next;
handler t1 close;
handler t2 close;
connection flush;
reap;
connection default;
drop table t1,t2;
disconnect flush;
#
# Bug#31409 RENAME TABLE causes server crash or deadlock when used with HANDLER statements
#
--disable_warnings
drop table if exists t1,t2;
--enable_warnings
create table t1 (c1 int);
--echo connection: default
handler t1 open;
handler t1 read first;
connect (flush,localhost,root,,);
connection flush;
--echo connection: flush
--send rename table t1 to t2;
connection waiter;
--echo connection: waiter
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table" and info = "rename table t1 to t2";
--source include/wait_condition.inc
connection default;
--echo connection: default
handler t2 open;
handler t2 read first;
--error ER_NO_SUCH_TABLE
handler t1 read next;
handler t1 close;
handler t2 close;
connection flush;
reap;
connection default;
drop table t2;
connection flush;
disconnect flush;
--source include/wait_until_disconnected.inc
connection waiter;
disconnect waiter;
--source include/wait_until_disconnected.inc
connection default;
#
# Bug#30882 Dropping a temporary table inside a stored function may cause a server crash
#
# Test HANDLER statements in conjunction with temporary tables. While the temporary table
# is open by a HANDLER, no other statement can access it.
#
--disable_warnings
drop table if exists t1;
--enable_warnings
create temporary table t1 (a int, b char(1), key a(a), key b(a,b));
insert into t1 values (0,"a"),(1,"b"),(2,"c"),(3,"d"),(4,"e"),
(5,"f"),(6,"g"),(7,"h"),(8,"i"),(9,"j");
select a,b from t1;
handler t1 open as a1;
handler a1 read a first;
handler a1 read a next;
handler a1 read a next;
--error ER_CANT_REOPEN_TABLE
select a,b from t1;
handler a1 read a prev;
handler a1 read a prev;
handler a1 read a=(6) where b="g";
handler a1 close;
select a,b from t1;
handler t1 open as a2;
handler a2 read a first;
handler a2 read a last;
handler a2 read a prev;
handler a2 close;
drop table t1;
#
# Bug#31397 Inconsistent drop table behavior of handler tables.
#
--disable_warnings
drop table if exists t1,t2;
--enable_warnings
create table t1 (a int);
handler t1 open as t1_alias;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
flush tables;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias close;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias read first;
drop table t1;
--error ER_UNKNOWN_TABLE
handler t1_alias read next;
# Test that temporary tables associated with handlers are properly dropped.
create table t1 (a int);
create temporary table t2 (a int, key(a));
handler t1 open as a1;
handler t2 open as a2;
handler a2 read a first;
drop table t1, t2;
--error ER_UNKNOWN_TABLE
handler a2 read a next;
--error ER_UNKNOWN_TABLE
handler a1 close;
# Alter table drop handlers
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
handler a2 read a first;
alter table t1 add b int;
--error ER_UNKNOWN_TABLE
handler a1 close;
handler a2 close;
drop table t1, t2;
# Rename table drop handlers
create table t1 (a int, key(a));
handler t1 open as a1;
handler a1 read a first;
rename table t1 to t2;
--error ER_UNKNOWN_TABLE
handler a1 read a first;
drop table t2;
# Optimize table drop handlers
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
handler a2 read a first;
optimize table t1;
--error ER_UNKNOWN_TABLE
handler a1 close;
handler a2 close;
drop table t1, t2;
# Flush tables causes handlers reopen
create table t1 (a int, b char(1), key a(a), key b(a,b));
insert into t1 values (0,"a"),(1,"b"),(2,"c"),(3,"d"),(4,"e"),
(5,"f"),(6,"g"),(7,"h"),(8,"i"),(9,"j");
handler t1 open;
handler t1 read a first;
handler t1 read a next;
flush tables;
handler t1 read a next;
handler t1 read a next;
flush tables with read lock;
handler t1 read a next;
unlock tables;
drop table t1;
--error ER_UNKNOWN_TABLE
handler t1 read a next;
#
# Bug#41110: crash with handler command when used concurrently with alter table
# Bug#41112: crash in mysql_ha_close_table/get_lock_data with alter table
#
connect(con1,localhost,root,,);
connect(con2,localhost,root,,);
connection default;
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (a int);
insert into t1 values (1);
handler t1 open;
connection con1;
send alter table t1 engine=memory;
connection con2;
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table" and info = "alter table t1 engine=memory";
--source include/wait_condition.inc
connection default;
--error ER_ILLEGAL_HA
handler t1 read a next;
handler t1 close;
connection con1;
--reap
drop table t1;
disconnect con1;
--source include/wait_until_disconnected.inc
connection con2;
disconnect con2;
--source include/wait_until_disconnected.inc
connection default;
#
# Bug#44151 using handler commands on information_schema tables crashes server
#
USE information_schema;
--error ER_WRONG_USAGE
HANDLER COLUMNS OPEN;
USE test;