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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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47
sql/sql_view.cc
View File

@@ -162,6 +162,7 @@ err:
SYNOPSIS
mysql_create_view()
thd - thread handler
views - views to create
mode - VIEW_CREATE_NEW, VIEW_ALTER, VIEW_CREATE_OR_REPLACE
RETURN VALUE
@@ -169,7 +170,7 @@ err:
TRUE Error
*/
bool mysql_create_view(THD *thd,
bool mysql_create_view(THD *thd, TABLE_LIST *views,
enum_view_create_mode mode)
{
LEX *lex= thd->lex;
@@ -490,6 +491,37 @@ bool mysql_create_view(THD *thd,
}
VOID(pthread_mutex_lock(&LOCK_open));
res= mysql_register_view(thd, view, mode);
if (mysql_bin_log.is_open())
{
String buff;
const LEX_STRING command[3]=
{{(char *)STRING_WITH_LEN("CREATE ")},
{(char *)STRING_WITH_LEN("ALTER ")},
{(char *)STRING_WITH_LEN("CREATE OR REPLACE ")}};
buff.append(command[thd->lex->create_view_mode].str,
command[thd->lex->create_view_mode].length);
view_store_options(thd, views, &buff);
buff.append(STRING_WITH_LEN("VIEW "));
/* Test if user supplied a db (ie: we did not use thd->db) */
if (views->db && views->db[0] &&
(thd->db == NULL || strcmp(views->db, thd->db)))
{
append_identifier(thd, &buff, views->db,
views->db_length);
buff.append('.');
}
append_identifier(thd, &buff, views->table_name,
views->table_name_length);
buff.append(STRING_WITH_LEN(" AS "));
buff.append(views->source.str, views->source.length);
Query_log_event qinfo(thd, buff.ptr(), buff.length(), 0, FALSE);
mysql_bin_log.write(&qinfo);
}
VOID(pthread_mutex_unlock(&LOCK_open));
if (view->revision != 1)
query_cache_invalidate3(thd, view, 0);
@@ -1229,12 +1261,12 @@ bool mysql_drop_view(THD *thd, TABLE_LIST *views, enum_drop_mode drop_mode)
bool type= 0;
db_type not_used;
VOID(pthread_mutex_lock(&LOCK_open));
for (view= views; view; view= view->next_local)
{
strxnmov(path, FN_REFLEN, mysql_data_home, "/", view->db, "/",
view->table_name, reg_ext, NullS);
(void) unpack_filename(path, path);
VOID(pthread_mutex_lock(&LOCK_open));
if (access(path, F_OK) ||
(type= (mysql_frm_type(thd, path, &not_used) != FRMTYPE_VIEW)))
{
@@ -1245,7 +1277,6 @@ bool mysql_drop_view(THD *thd, TABLE_LIST *views, enum_drop_mode drop_mode)
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR),
name);
VOID(pthread_mutex_unlock(&LOCK_open));
continue;
}
if (type)
@@ -1258,8 +1289,16 @@ bool mysql_drop_view(THD *thd, TABLE_LIST *views, enum_drop_mode drop_mode)
goto err;
query_cache_invalidate3(thd, view, 0);
sp_cache_invalidate();
VOID(pthread_mutex_unlock(&LOCK_open));
}
if (mysql_bin_log.is_open())
{
thd->clear_error();
Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
mysql_bin_log.write(&qinfo);
}
VOID(pthread_mutex_unlock(&LOCK_open));
send_ok(thd);
DBUG_RETURN(FALSE);