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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`;'.
112 lines
4.5 KiB
Plaintext
112 lines
4.5 KiB
Plaintext
include/master-slave.inc
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[connection master]
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==== Initialize ====
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[on master]
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CREATE TABLE t1 (a CHAR(48));
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CREATE TEMPORARY TABLE t1_tmp1(a INT);
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INSERT INTO t1 VALUES (UUID());
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[on slave]
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==== Verify results on slave ====
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SHOW STATUS LIKE "Slave_open_temp_tables";
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Variable_name Value
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Slave_open_temp_tables 1
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[on master]
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[on master1]
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[on slave]
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==== Verify results on slave ====
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SHOW STATUS LIKE "Slave_open_temp_tables";
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Variable_name Value
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Slave_open_temp_tables 0
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==== Clean up ====
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[on master]
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include/rpl_connect.inc [creating master]
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DROP TABLE t1;
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[on slave]
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include/rpl_reset.inc
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CREATE TABLE t1 (a int);
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CREATE TABLE t2 ( i1 INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (i1) );
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CREATE TABLE t3 ( i1 INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (i1) );
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CREATE TRIGGER tr1 AFTER DELETE ON t2 FOR EACH ROW INSERT INTO t3 () VALUES ();
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CREATE TEMPORARY TABLE t1_tmp (i1 int);
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ALTER TABLE t1_tmp ADD COLUMN b INT;
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DELETE FROM t2;
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CREATE TEMPORARY TABLE t2_tmp (a int);
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ALTER TABLE t1_tmp ADD COLUMN c INT;
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### assertion: assert that there is one open temp table on slave
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SHOW STATUS LIKE 'Slave_open_temp_tables';
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Variable_name Value
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Slave_open_temp_tables 1
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DROP TABLE t1_tmp, t2;
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INSERT INTO t1 VALUES (1);
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DROP TEMPORARY TABLE t2_tmp;
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INSERT INTO t1 VALUES (2);
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### assertion: assert that slave has no temporary tables opened
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SHOW STATUS LIKE 'Slave_open_temp_tables';
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Variable_name Value
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Slave_open_temp_tables 0
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DROP TABLE t3, t1;
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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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slave-bin.000001 # Query # # use `test`; CREATE TABLE t1 (a int)
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slave-bin.000001 # Query # # use `test`; CREATE TABLE t2 ( i1 INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (i1) )
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slave-bin.000001 # Query # # use `test`; CREATE TABLE t3 ( i1 INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (i1) )
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slave-bin.000001 # Query # # use `test`; CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t2 FOR EACH ROW INSERT INTO t3 () VALUES ()
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slave-bin.000001 # Query # # use `test`; CREATE TEMPORARY TABLE t1_tmp (i1 int)
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slave-bin.000001 # Query # # use `test`; ALTER TABLE t1_tmp ADD COLUMN b INT
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slave-bin.000001 # Query # # DROP TEMPORARY TABLE IF EXISTS `test`.`t1_tmp` /* generated by server */
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slave-bin.000001 # Query # # use `test`; DROP TABLE `t2` /* generated by server */
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slave-bin.000001 # Query # # BEGIN
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slave-bin.000001 # Table_map # # table_id: # (test.t1)
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slave-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
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slave-bin.000001 # Xid # # COMMIT /* XID */
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slave-bin.000001 # Query # # DROP TEMPORARY TABLE IF EXISTS `test`.`t2_tmp` /* generated by server */
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slave-bin.000001 # Query # # BEGIN
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slave-bin.000001 # Query # # use `test`; INSERT INTO t1 VALUES (2)
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slave-bin.000001 # Xid # # COMMIT /* XID */
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slave-bin.000001 # Query # # use `test`; DROP TABLE `t3`,`t1` /* generated by server */
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# Bug#55478 Row events wrongly apply on the temporary table of the same name
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# ==========================================================================
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# The statement should be binlogged
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CREATE TEMPORARY TABLE t1(c1 INT) ENGINE=InnoDB;
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# Case 1: CREATE TABLE t1 ... SELECT
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# ----------------------------------
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# The statement generates row events on t1. And the rows events should
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# be inserted into the base table on slave.
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CREATE TABLE t1 ENGINE=MyISAM SELECT rand();
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show binlog events in 'master-bin.000001' 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 # # BEGIN
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master-bin.000001 # Query # # use `test`; CREATE TABLE `t1` (
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`rand()` double NOT NULL DEFAULT '0'
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) ENGINE=MyISAM
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master-bin.000001 # Table_map # # table_id: # (test.t1)
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master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
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master-bin.000001 # Query # # COMMIT
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# Case 2: DROP TEMPORARY TABLE in a transacation
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# ----------------------------------------------
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BEGIN;
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DROP TEMPORARY TABLE t1;
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# The rows event will binlogged before 'DROP TEMPORARY TABLE t1',
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# as t1 is non-transactional table
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INSERT INTO t1 VALUES(Rand());
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COMMIT;
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show binlog events in 'master-bin.000001' 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 # # BEGIN
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master-bin.000001 # Table_map # # table_id: # (test.t1)
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master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
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master-bin.000001 # Query # # COMMIT
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master-bin.000001 # Query # # BEGIN
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master-bin.000001 # Query # # DROP TEMPORARY TABLE IF EXISTS `test`.`t1` /* generated by server */
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master-bin.000001 # Query # # COMMIT
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# Compare the base table.
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include/diff_tables.inc [master:t1, slave:t1]
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DROP TABLE t1;
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include/rpl_end.inc
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