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IN TIME RECOVERY FAILURE ON SLAVES Problem: DROP TEMP TABLE IF EXISTS commands can cause point in time recovery (re-applying binlog) failures. Analyses: In RBR, 'DROP TEMPORARY TABLE' commands are always binlogged by adding 'IF EXISTS' clauses. Also, the slave SQL thread will not check replicate.* filter rules for "DROP TEMPORARY TABLE IF EXISTS" queries. If log-slave-updates is enabled on slave, these queries will be binlogged in the format of "USE `db`; DROP TEMPORARY TABLE IF EXISTS `t1`;" irrespective of filtering rules and irrespective of the `db` existence. When users try to recover slave from it's own binlog, use `db` command might fail if `db` is not present on slave. Fix: At the time of writing the 'DROP TEMPORARY TABLE IF EXISTS' query into the binlog, 'use `db`' will not be present and the table name in the query will be a fully qualified table name. Eg: 'USE `db`; DROP TEMPORARY TABLE IF EXISTS `t1`;' will be logged as 'DROP TEMPORARY TABLE IF EXISTS `db`.`t1`;'.
55 lines
1.1 KiB
Plaintext
55 lines
1.1 KiB
Plaintext
include/master-slave.inc
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[connection master]
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**** On Master ****
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CREATE TABLE t1 (a int);
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CREATE TABLE t2 (a int);
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CREATE TEMPORARY TABLE t2 (a int, b int);
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SHOW TABLES;
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Tables_in_test
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t1
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t2
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**** On Slave ****
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SHOW TABLES;
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Tables_in_test
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t1
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t2
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**** On Master ****
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DROP TABLE t2;
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SHOW TABLES;
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Tables_in_test
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t1
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t2
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**** On Slave ****
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SHOW TABLES;
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Tables_in_test
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t1
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t2
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**** On Master ****
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CREATE TEMPORARY TABLE t2 (a int, b int);
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SHOW TABLES;
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Tables_in_test
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t1
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t2
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**** On Slave ****
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SHOW TABLES;
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Tables_in_test
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t1
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t2
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**** On Master ****
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DROP TABLE t1,t2;
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show binlog events from <binlog_start>;
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000001 # Query # # use `test`; CREATE TABLE t1 (a int)
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master-bin.000001 # Query # # use `test`; CREATE TABLE t2 (a int)
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master-bin.000001 # Query # # DROP TEMPORARY TABLE IF EXISTS `test`.`t2` /* generated by server */
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master-bin.000001 # Query # # DROP TEMPORARY TABLE IF EXISTS `test`.`t2` /* generated by server */
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master-bin.000001 # Query # # use `test`; DROP TABLE `t1` /* generated by server */
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SHOW TABLES;
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Tables_in_test
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t2
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**** On Slave ****
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SHOW TABLES;
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Tables_in_test
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t2
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include/rpl_end.inc
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