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BUG#32943: Fixed buggy lock handling of ALTER TABLE for partitioning

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mysql-test/r/partition_range.result:
  Added new test cases for lock tables and ALTER TABLE for
  partitions, also added a test case with a trigger.
mysql-test/t/partition_range.test:
  Added new test cases for lock tables and ALTER TABLE for
  partitions, also added a test case with a trigger.
sql/mysql_priv.h:
  Added WFRM_KEEP_SHARE for use of code not to be used otherwise
sql/sql_partition.cc:
  Removed get_name_lock and release_name_lock, use
  close_data_files_and_morph_locks which leaves an
  exclusive name lock after completing.
  Reopen table after completing if under lock tables
  Updated comments
sql/sql_table.cc:
  Ensure that code to set partition syntax isn't used other than
  when specifically asked to do it.
This commit is contained in:
unknown 2008-01-28 15:20:55 +01:00
parent 4bacd53715
commit 516f95acea
5 changed files with 109 additions and 73 deletions
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22
mysql-test/r/partition_range.result
View File

@ -1,4 +1,26 @@
drop table if exists t1, t2;
create table t1 (a integer)
partition by range (a)
( partition p0 values less than (4),
partition p1 values less than (100));
create trigger tr1 before insert on t1
for each row begin
set @a = 1;
end|
alter table t1 drop partition p0;
drop table t1;
create table t1 (a integer)
partition by range (a)
( partition p0 values less than (4),
partition p1 values less than (100));
LOCK TABLES t1 WRITE;
alter table t1 drop partition p0;
alter table t1 reorganize partition p1 into
( partition p0 values less than (4),
partition p1 values less than (100));
alter table t1 add partition ( partition p2 values less than (200));
UNLOCK TABLES;
drop table t1;
create table t1 (a int unsigned)
partition by range (a)
(partition pnull values less than (0),

35
mysql-test/t/partition_range.test
View File

@ -9,6 +9,41 @@
drop table if exists t1, t2;
--enable_warnings
#
# BUG 32943:
# Locking problems in relation to partitioning and triggers
# Also fixes and test cases of generic lock issues with
# partition change code.
#
create table t1 (a integer)
partition by range (a)
( partition p0 values less than (4),
partition p1 values less than (100));
delimiter |;
create trigger tr1 before insert on t1
for each row begin
set @a = 1;
end|
delimiter ;|
alter table t1 drop partition p0;
drop table t1;
create table t1 (a integer)
partition by range (a)
( partition p0 values less than (4),
partition p1 values less than (100));
LOCK TABLES t1 WRITE;
alter table t1 drop partition p0;
alter table t1 reorganize partition p1 into
( partition p0 values less than (4),
partition p1 values less than (100));
alter table t1 add partition ( partition p2 values less than (200));
UNLOCK TABLES;
drop table t1;
#
# BUG 18198: Various tests for partition functions
#

1
sql/mysql_priv.h
View File

@ -1635,6 +1635,7 @@ extern pthread_mutex_t LOCK_gdl;
#define WFRM_WRITE_SHADOW 1
#define WFRM_INSTALL_SHADOW 2
#define WFRM_PACK_FRM 4
#define WFRM_KEEP_SHARE 8
bool mysql_write_frm(ALTER_PARTITION_PARAM_TYPE *lpt, uint flags);
int abort_and_upgrade_lock(ALTER_PARTITION_PARAM_TYPE *lpt);
void close_open_tables_and_downgrade(ALTER_PARTITION_PARAM_TYPE *lpt);

114
sql/sql_partition.cc
View File

@ -5838,32 +5838,32 @@ static void release_log_entries(partition_info *part_info)
/*
Get a lock on table name to avoid that anyone can open the table in
a critical part of the ALTER TABLE.
SYNOPSIS
get_name_lock()
Final part of partition changes to handle things when under
LOCK TABLES.
SYNPOSIS
alter_partition_lock_handling()
lpt Struct carrying parameters
RETURN VALUES
FALSE Success
TRUE Failure
NONE
*/
static int get_name_lock(ALTER_PARTITION_PARAM_TYPE *lpt)
void alter_partition_lock_handling(ALTER_PARTITION_PARAM_TYPE *lpt)
{
int error= 0;
DBUG_ENTER("get_name_lock");
bzero(&lpt->table_list, sizeof(lpt->table_list));
lpt->table_list.db= (char*)lpt->db;
lpt->table_list.table= lpt->table;
lpt->table_list.table_name= (char*)lpt->table_name;
pthread_mutex_lock(&LOCK_open);
error= lock_table_name(lpt->thd, &lpt->table_list, FALSE);
pthread_mutex_unlock(&LOCK_open);
DBUG_RETURN(error);
int err;
if (lpt->thd->locked_tables)
{
pthread_mutex_lock(&LOCK_open);
lpt->thd->in_lock_tables= 1;
err= reopen_tables(lpt->thd, 1, 1);
lpt->thd->in_lock_tables= 0;
pthread_mutex_unlock(&LOCK_open);
if (err)
{
/* Issue a warning since we weren't able to regain the lock again. */
sql_print_warning("We failed to reacquire LOCKs in ALTER TABLE");
}
}
}
/*
Unlock and close table before renaming and dropping partitions
SYNOPSIS
@ -5876,35 +5876,16 @@ static int get_name_lock(ALTER_PARTITION_PARAM_TYPE *lpt)
static int alter_close_tables(ALTER_PARTITION_PARAM_TYPE *lpt)
{
THD *thd= lpt->thd;
TABLE *table= lpt->table;
const char *db= lpt->db;
const char *table_name= lpt->table_name;
DBUG_ENTER("alter_close_tables");
/*
We need to also unlock tables and close all handlers.
We set lock to zero to ensure we don't do this twice
and we set db_stat to zero to ensure we don't close twice.
*/
mysql_unlock_tables(thd, thd->lock);
thd->lock= 0;
table->file->close();
table->db_stat= 0;
DBUG_RETURN(0);
}
/*
Release a lock name
SYNOPSIS
release_name_lock()
lpt
RETURN VALUES
0
*/
static int release_name_lock(ALTER_PARTITION_PARAM_TYPE *lpt)
{
DBUG_ENTER("release_name_lock");
pthread_mutex_lock(&LOCK_open);
unlock_table_name(lpt->thd, &lpt->table_list);
close_data_files_and_morph_locks(thd, db, table_name);
pthread_mutex_unlock(&LOCK_open);
DBUG_RETURN(0);
}
@ -6202,7 +6183,7 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
name lock.
5) Close all tables that have already been opened but didn't stumble on
the abort locked previously. This is done as part of the
get_name_lock call.
close_data_files_and_morph_locks call.
6) We are now ready to release all locks we got in this thread.
7) Write the bin log
Unfortunately the writing of the binlog is not synchronised with
@ -6219,8 +6200,7 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
9) Prepare handlers for drop of partitions
10) Drop the partitions
11) Remove entries from ddl log
12) Release name lock so that all other threads can access the table
again.
12) Reopen table if under lock tables
13) Complete query
We insert Error injections at all places where it could be interesting
@ -6235,23 +6215,21 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
(not_completed= FALSE) ||
abort_and_upgrade_lock(lpt) || /* Always returns 0 */
ERROR_INJECT_CRASH("crash_drop_partition_4") ||
get_name_lock(lpt) ||
ERROR_INJECT_CRASH("crash_drop_partition_5") ||
alter_close_tables(lpt) ||
ERROR_INJECT_CRASH("crash_drop_partition_6") ||
ERROR_INJECT_CRASH("crash_drop_partition_5") ||
((!thd->lex->no_write_to_binlog) &&
(write_bin_log(thd, FALSE,
thd->query, thd->query_length), FALSE)) ||
ERROR_INJECT_CRASH("crash_drop_partition_7") ||
ERROR_INJECT_CRASH("crash_drop_partition_6") ||
((frm_install= TRUE), FALSE) ||
mysql_write_frm(lpt, WFRM_INSTALL_SHADOW) ||
((frm_install= FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_drop_partition_8") ||
ERROR_INJECT_CRASH("crash_drop_partition_7") ||
mysql_drop_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_drop_partition_9") ||
ERROR_INJECT_CRASH("crash_drop_partition_8") ||
(write_log_completed(lpt, FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_drop_partition_10") ||
(release_name_lock(lpt), FALSE))
ERROR_INJECT_CRASH("crash_drop_partition_9") ||
(alter_partition_lock_handling(lpt), FALSE))
{
handle_alter_part_error(lpt, not_completed, TRUE, frm_install);
goto err;
@ -6283,7 +6261,7 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
name lock.
5) Close all tables that have already been opened but didn't stumble on
the abort locked previously. This is done as part of the
get_name_lock call.
close_data_files_and_morph_locks call.
6) Close all table handlers and unlock all handlers but retain name lock
7) Write binlog
8) Now the change is completed except for the installation of the
@ -6293,7 +6271,7 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
added to the table.
10)Wait until all accesses using the old frm file has completed
11)Remove entries from ddl log
12)Release name lock
12)Reopen tables if under lock tables
13)Complete query
*/
if (write_log_add_change_partition(lpt) ||
@ -6303,8 +6281,6 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
mysql_change_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_3") ||
abort_and_upgrade_lock(lpt) || /* Always returns 0 */
ERROR_INJECT_CRASH("crash_add_partition_3") ||
get_name_lock(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_4") ||
alter_close_tables(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_5") ||
@ -6320,7 +6296,7 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
ERROR_INJECT_CRASH("crash_add_partition_8") ||
(write_log_completed(lpt, FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_add_partition_9") ||
(release_name_lock(lpt), FALSE))
(alter_partition_lock_handling(lpt), FALSE))
{
handle_alter_part_error(lpt, not_completed, FALSE, frm_install);
goto err;
@ -6374,15 +6350,15 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
7) Close all tables opened but not yet locked, after this call we are
certain that no other thread is in the lock wait queue or has
opened the table. The name lock will ensure that they are blocked
on the open call. This is achieved also by get_name_lock call.
on the open call.
This is achieved also by close_data_files_and_morph_locks call.
8) Close all partitions opened by this thread, but retain name lock.
9) Write bin log
10) Prepare handlers for rename and delete of partitions
11) Rename and drop the reorged partitions such that they are no
longer used and rename those added to their real new names.
12) Install the shadow frm file
13) Release the name lock to enable other threads to start using the
table again.
13) Reopen the table if under lock tables
14) Complete query
*/
if (write_log_add_change_partition(lpt) ||
@ -6396,24 +6372,22 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
(not_completed= FALSE) ||
abort_and_upgrade_lock(lpt) || /* Always returns 0 */
ERROR_INJECT_CRASH("crash_change_partition_5") ||
get_name_lock(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_6") ||
alter_close_tables(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_7") ||
ERROR_INJECT_CRASH("crash_change_partition_6") ||
((!thd->lex->no_write_to_binlog) &&
(write_bin_log(thd, FALSE,
thd->query, thd->query_length), FALSE)) ||
ERROR_INJECT_CRASH("crash_change_partition_8") ||
ERROR_INJECT_CRASH("crash_change_partition_7") ||
mysql_write_frm(lpt, WFRM_INSTALL_SHADOW) ||
ERROR_INJECT_CRASH("crash_change_partition_9") ||
ERROR_INJECT_CRASH("crash_change_partition_8") ||
mysql_drop_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_10") ||
ERROR_INJECT_CRASH("crash_change_partition_9") ||
mysql_rename_partitions(lpt) ||
((frm_install= TRUE), FALSE) ||
ERROR_INJECT_CRASH("crash_change_partition_11") ||
ERROR_INJECT_CRASH("crash_change_partition_10") ||
(write_log_completed(lpt, FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_change_partition_12") ||
(release_name_lock(lpt), FALSE))
ERROR_INJECT_CRASH("crash_change_partition_11") ||
(alter_partition_lock_handling(lpt), FALSE))
{
handle_alter_part_error(lpt, not_completed, FALSE, frm_install);
goto err;

10
sql/sql_table.cc
View File

@ -1226,8 +1226,12 @@ uint build_table_shadow_filename(char *buff, size_t bufflen,
flags Flags as defined below
WFRM_INITIAL_WRITE If set we need to prepare table before
creating the frm file
WFRM_CREATE_HANDLER_FILES If set we need to create the handler file as
part of the creation of the frm file
WFRM_INSTALL_SHADOW If set we should install the new frm
WFRM_KEEP_SHARE If set we know that the share is to be
retained and thus we should ensure share
object is correct, if not set we don't
set the new partition syntax string since
we know the share object is destroyed.
WFRM_PACK_FRM If set we should pack the frm file and delete
the frm file
@ -1370,7 +1374,7 @@ bool mysql_write_frm(ALTER_PARTITION_PARAM_TYPE *lpt, uint flags)
goto err;
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (part_info)
if (part_info && (flags & WFRM_KEEP_SHARE))
{
TABLE_SHARE *share= lpt->table->s;
char *tmp_part_syntax_str;