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From:Dmitry Lenev Date:May 25 2011 3:12pm
Subject:bzr commit into mysql-5.1 branch (Dmitry.Lenev:3625) Bug#11762012
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#At file:///home/dlenev/src/bzr/mysql-5.1-11762012/ based on revid:vasil.dimov@stripped

 3625 Dmitry Lenev	2011-05-25
      Fix for bug #11762012 - "54553: INNODB ASSERTS IN 
      HA_INNOBASE::UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
      
      Attempt to update an InnoDB temporary table under LOCK TABLES
      led to assertion failure in both debug and production builds
      if this temporary table was explicitly locked for READ. The 
      same scenario works fine for MyISAM temporary tables.
      
      The assertion failure was caused by discrepancy between lock 
      that was requested on the rows of temporary table at LOCK TABLES
      time and by update operation. Since SQL-layer requested a 
      read-lock at LOCK TABLES time InnoDB engine assumed that upcoming
      statements which are going to be executed under LOCK TABLES will 
      only read table and therefore should acquire only S-lock.
      An update operation broken this assumption by requesting X-lock.
      
      Possible approaches to fixing this problem are:
      
      1) Skip locking of temporary tables as locking doesn't make any
         sense for connection-local objects.
      2) Prohibit changing of temporary table locked by LOCK TABLES ... 
         READ.
      
      Unfortunately both of these approaches have drawbacks which make 
      them unviable for stable versions of server.
      
      So this patch takes another approach and changes code in such way
      that LOCK TABLES for a temporary table will always request write
      lock. In 5.1 version of this patch switch from read lock to write
      lock is done inside of InnoDBs handler methods as doing it on 
      SQL-layer causes compatibility troubles with FLUSH TABLES WITH
      READ LOCK.
     @ mysql-test/suite/innodb/r/innodb_mysql.result
        Added test for bug #11762012 - "54553: INNODB ASSERTS IN 
        HA_INNOBASE::UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
     @ mysql-test/suite/innodb/t/innodb_mysql.test
        Added test for bug #11762012 - "54553: INNODB ASSERTS IN 
        HA_INNOBASE::UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
     @ mysql-test/suite/innodb_plugin/r/innodb_mysql.result
        Added test for bug #11762012 - "54553: INNODB ASSERTS IN 
        HA_INNOBASE::UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
     @ mysql-test/suite/innodb_plugin/t/innodb_mysql.test
        Added test for bug #11762012 - "54553: INNODB ASSERTS IN 
        HA_INNOBASE::UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
     @ storage/innobase/handler/ha_innodb.cc
        Assume that a temporary table locked by LOCK TABLES can be updated
        even if it was only locked for read and therefore an X-lock should 
        be always requested for such tables.
     @ storage/innodb_plugin/handler/ha_innodb.cc
        Assume that a temporary table locked by LOCK TABLES can be updated
        even if it was only locked for read and therefore an X-lock should 
        be always requested for such tables.

    modified:
      mysql-test/suite/innodb/r/innodb_mysql.result
      mysql-test/suite/innodb/t/innodb_mysql.test
      mysql-test/suite/innodb_plugin/r/innodb_mysql.result
      mysql-test/suite/innodb_plugin/t/innodb_mysql.test
      storage/innobase/handler/ha_innodb.cc
      storage/innodb_plugin/handler/ha_innodb.cc
=== modified file 'mysql-test/suite/innodb/r/innodb_mysql.result'
--- a/mysql-test/suite/innodb/r/innodb_mysql.result	2010-12-08 14:21:03 +0000
+++ b/mysql-test/suite/innodb/r/innodb_mysql.result	2011-05-25 15:12:25 +0000
@@ -2639,7 +2639,6 @@ COUNT(*)
 1537
 SET SESSION sort_buffer_size = DEFAULT;
 DROP TABLE t1;
-End of 5.1 tests
 #
 # Test for bug #39932 "create table fails if column for FK is in different
 #                      case than in corr index".
@@ -2668,3 +2667,20 @@ DROP TABLE IF EXISTS t1, t2;
 CREATE TABLE t1 (a INT, INDEX(a)) engine=innodb;
 ALTER TABLE t1 RENAME TO t2, DISABLE KEYS;
 DROP TABLE IF EXISTS t1, t2;
+#
+# Test for bug #11762012 - "54553: INNODB ASSERTS IN HA_INNOBASE::
+#                           UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
+#
+DROP TABLE IF EXISTS t1;
+CREATE TEMPORARY TABLE t1 (c int) ENGINE = InnoDB;
+INSERT INTO t1 VALUES (1);
+LOCK TABLES t1 READ;
+# Even though temporary table was locked for READ we
+# still allow writes to it to be compatible with MyISAM.
+# This is possible since due to fact that temporary tables
+# are specific to connection and therefore locking for them
+# is irrelevant.
+UPDATE t1 SET c = 5;
+UNLOCK TABLES;
+DROP TEMPORARY TABLE t1;
+End of 5.1 tests

=== modified file 'mysql-test/suite/innodb/t/innodb_mysql.test'
--- a/mysql-test/suite/innodb/t/innodb_mysql.test	2010-12-20 11:58:33 +0000
+++ b/mysql-test/suite/innodb/t/innodb_mysql.test	2011-05-25 15:12:25 +0000
@@ -868,9 +868,6 @@ SET SESSION sort_buffer_size = DEFAULT;
 DROP TABLE t1;
 
 
---echo End of 5.1 tests
-
-
 --echo #
 --echo # Test for bug #39932 "create table fails if column for FK is in different
 --echo #                      case than in corr index".
@@ -900,3 +897,25 @@ CREATE TABLE t1 (a INT, INDEX(a)) engine
 ALTER TABLE t1 RENAME TO t2, DISABLE KEYS;
 DROP TABLE IF EXISTS t1, t2;
 --enable_warnings
+
+
+--echo #
+--echo # Test for bug #11762012 - "54553: INNODB ASSERTS IN HA_INNOBASE::
+--echo #                           UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
+--echo #
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+CREATE TEMPORARY TABLE t1 (c int) ENGINE = InnoDB;
+INSERT INTO t1 VALUES (1);
+LOCK TABLES t1 READ;
+--echo # Even though temporary table was locked for READ we
+--echo # still allow writes to it to be compatible with MyISAM.
+--echo # This is possible since due to fact that temporary tables
+--echo # are specific to connection and therefore locking for them
+--echo # is irrelevant.
+UPDATE t1 SET c = 5;
+UNLOCK TABLES;
+DROP TEMPORARY TABLE t1;
+
+--echo End of 5.1 tests

=== modified file 'mysql-test/suite/innodb_plugin/r/innodb_mysql.result'
--- a/mysql-test/suite/innodb_plugin/r/innodb_mysql.result	2010-11-23 10:18:47 +0000
+++ b/mysql-test/suite/innodb_plugin/r/innodb_mysql.result	2011-05-25 15:12:25 +0000
@@ -2438,4 +2438,20 @@ COUNT(*)
 1537
 SET SESSION sort_buffer_size = DEFAULT;
 DROP TABLE t1;
+#
+# Test for bug #11762012 - "54553: INNODB ASSERTS IN HA_INNOBASE::
+#                           UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
+#
+DROP TABLE IF EXISTS t1;
+CREATE TEMPORARY TABLE t1 (c int) ENGINE = InnoDB;
+INSERT INTO t1 VALUES (1);
+LOCK TABLES t1 READ;
+# Even though temporary table was locked for READ we
+# still allow writes to it to be compatible with MyISAM.
+# This is possible since due to fact that temporary tables
+# are specific to connection and therefore locking for them
+# is irrelevant.
+UPDATE t1 SET c = 5;
+UNLOCK TABLES;
+DROP TEMPORARY TABLE t1;
 End of 5.1 tests

=== modified file 'mysql-test/suite/innodb_plugin/t/innodb_mysql.test'
--- a/mysql-test/suite/innodb_plugin/t/innodb_mysql.test	2010-11-23 10:18:47 +0000
+++ b/mysql-test/suite/innodb_plugin/t/innodb_mysql.test	2011-05-25 15:12:25 +0000
@@ -689,4 +689,24 @@ SET SESSION sort_buffer_size = DEFAULT;
 
 DROP TABLE t1;
 
+
+--echo #
+--echo # Test for bug #11762012 - "54553: INNODB ASSERTS IN HA_INNOBASE::
+--echo #                           UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK".
+--echo #
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+CREATE TEMPORARY TABLE t1 (c int) ENGINE = InnoDB;
+INSERT INTO t1 VALUES (1);
+LOCK TABLES t1 READ;
+--echo # Even though temporary table was locked for READ we
+--echo # still allow writes to it to be compatible with MyISAM.
+--echo # This is possible since due to fact that temporary tables
+--echo # are specific to connection and therefore locking for them
+--echo # is irrelevant.
+UPDATE t1 SET c = 5;
+UNLOCK TABLES;
+DROP TEMPORARY TABLE t1;
+
 --echo End of 5.1 tests

=== modified file 'storage/innobase/handler/ha_innodb.cc'
--- a/storage/innobase/handler/ha_innodb.cc	2011-04-11 13:40:28 +0000
+++ b/storage/innobase/handler/ha_innodb.cc	2011-05-25 15:12:25 +0000
@@ -7325,10 +7325,18 @@ ha_innobase::external_lock(
 
 	reset_template(prebuilt);
 
-	if (lock_type == F_WRLCK) {
+	if (lock_type == F_WRLCK ||
+            (table->s->tmp_table &&
+             thd_sql_command(thd) == SQLCOM_LOCK_TABLES)) {
 
 		/* If this is a SELECT, then it is in UPDATE TABLE ...
-		or SELECT ... FOR UPDATE */
+		or SELECT ... FOR UPDATE
+
+                For temporary tables which are locked for READ by LOCK TABLES
+                updates are still allowed by SQL-layer. In order to accomodate
+                for such a situation we always request X-lock for such table
+                at LOCK TABLES time.
+                */
 		prebuilt->select_lock_type = LOCK_X;
 		prebuilt->stored_select_lock_type = LOCK_X;
 	}

=== modified file 'storage/innodb_plugin/handler/ha_innodb.cc'
--- a/storage/innodb_plugin/handler/ha_innodb.cc	2011-04-11 13:40:28 +0000
+++ b/storage/innodb_plugin/handler/ha_innodb.cc	2011-05-25 15:12:25 +0000
@@ -8642,10 +8642,18 @@ ha_innobase::external_lock(
 
 	reset_template(prebuilt);
 
-	if (lock_type == F_WRLCK) {
+	if (lock_type == F_WRLCK ||
+            (table->s->tmp_table &&
+             thd_sql_command(thd) == SQLCOM_LOCK_TABLES)) {
 
 		/* If this is a SELECT, then it is in UPDATE TABLE ...
-		or SELECT ... FOR UPDATE */
+		or SELECT ... FOR UPDATE
+
+                For temporary tables which are locked for READ by LOCK TABLES
+                updates are still allowed by SQL-layer. In order to accomodate
+                for such a situation we always request X-lock for such table
+                at LOCK TABLES time.
+                */
 		prebuilt->select_lock_type = LOCK_X;
 		prebuilt->stored_select_lock_type = LOCK_X;
 	}


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Thread
bzr commit into mysql-5.1 branch (Dmitry.Lenev:3625) Bug#11762012Dmitry Lenev25 May
  • Re: bzr commit into mysql-5.1 branch (Dmitry.Lenev:3625) Bug#11762012Davi Arnaut25 May