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Bug #14262: SP: DROP PROCEDURE|VIEW (maybe more) write to binlog too late \

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(race cond)

It was possible for one thread to interrupt a Data Definition Language 
statement and thereby get messages to the binlog out of order.  Consider:

Connection 1: Drop Foo x
Connection 2: Create or replace Foo x
Connection 2: Log "Create or replace Foo x"
Connection 1: Log "Drop Foo x"

Local end would have Foo x, but the replicated slaves would not.

The fix for this is to wrap all DDL and logging of a kind in the same mutex.  
Since we already use mutexes for the various parts of altering the server, 
this only entails moving the logging events down close to the action, inside 
the mutex protection.
This commit is contained in:
cmiller@zippy.cornsilk.net
2006-10-03 13:38:25 -04:00
parent 46b3997c51
commit 5512100c6a
9 changed files with 183 additions and 109 deletions
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15
sql/sql_table.cc
View File

@ -3168,6 +3168,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
/* DISCARD/IMPORT TABLESPACE is always alone in an ALTER TABLE */
if (alter_info->tablespace_op != NO_TABLESPACE_OP)
/* Conditionally writes to binlog. */
DBUG_RETURN(mysql_discard_or_import_tablespace(thd,table_list,
alter_info->tablespace_op));
if (!(table=open_ltable(thd,table_list,TL_WRITE_ALLOW_READ)))
@ -3249,10 +3250,10 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
!table->s->tmp_table) // no need to touch frm
{
error=0;
VOID(pthread_mutex_lock(&LOCK_open));
if (new_name != table_name || new_db != db)
{
thd->proc_info="rename";
VOID(pthread_mutex_lock(&LOCK_open));
/* Then do a 'simple' rename of the table */
error=0;
if (!access(new_name_buff,F_OK))
@ -3274,7 +3275,6 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
error= -1;
}
}
VOID(pthread_mutex_unlock(&LOCK_open));
}
if (!error)
@ -3283,16 +3283,12 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
case LEAVE_AS_IS:
break;
case ENABLE:
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
case DISABLE:
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error=table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
@ -3322,6 +3318,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
table->file->print_error(error, MYF(0));
error= -1;
}
VOID(pthread_mutex_unlock(&LOCK_open));
table_list->table=0; // For query cache
query_cache_invalidate3(thd, table_list, 0);
DBUG_RETURN(error);
@ -3768,6 +3765,10 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
my_free((gptr) new_table,MYF(0));
goto err;
}
/*
Writing to the binlog does not need to be synchronized for temporary tables,
which are thread-specific.
*/
if (mysql_bin_log.is_open())
{
thd->clear_error();
@ -3950,7 +3951,7 @@ end_temporary:
thd->some_tables_deleted=0;
DBUG_RETURN(FALSE);
err:
err:
DBUG_RETURN(TRUE);
}