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MDEV-5769: Slave crashes on attempt to do parallel replication from an older master

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Older master has no GTID events, so such events are not available for
deciding on scheduling of event groups and so on.

With this patch, we run such events from old masters single-threaded, in the
sql driver thread.

This seems better than trying to make the parallel code handle the data from
older masters; while possible, this would require a lot of testing (as well as
possibly some extra overhead in the scheduling of events), which hardly seems
worthwhile.
This commit is contained in:
unknown
2014-03-04 08:48:32 +01:00
parent 641feed481
commit ec374f1e53
6 changed files with 134 additions and 45 deletions
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BIN
mysql-test/std_data/mariadb-5.5-binlog.000001 Normal file
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27
mysql-test/suite/rpl/r/rpl_old_master.result Normal file
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include/master-slave.inc
[connection master]
include/stop_slave.inc
include/rpl_stop_server.inc [server_number=1]
include/rpl_start_server.inc [server_number=1]
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=10;
CHANGE MASTER TO master_host='127.0.0.1', master_port=SERVER_MYPORT_1, master_user='root', master_log_file='master-bin.000001', master_log_pos=4;
include/start_slave.inc
CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1);
SELECT * FROM t1 ORDER BY a;
a b
1 1
2 2
3 4
4 8
5 16
SELECT * FROM t2;
a
1
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=@old_parallel;
DROP TABLE t1;
include/start_slave.inc
DROP TABLE t2;
include/rpl_end.inc

49
mysql-test/suite/rpl/t/rpl_old_master.test Normal file
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# Test replicating off old master.
# We simulate old master by copying in pre-generated binlog files from earlier
# server versions.
--source include/have_innodb.inc
--source include/master-slave.inc
--connection slave
--source include/stop_slave.inc
--connection master
--let $datadir= `SELECT @@datadir`
--let $rpl_server_number= 1
--source include/rpl_stop_server.inc
--remove_file $datadir/master-bin.000001
--copy_file $MYSQL_TEST_DIR/std_data/mariadb-5.5-binlog.000001 $datadir/master-bin.000001
--let $rpl_server_number= 1
--source include/rpl_start_server.inc
--source include/wait_until_connected_again.inc
--connection slave
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=10;
--replace_result $SERVER_MYPORT_1 SERVER_MYPORT_1
eval CHANGE MASTER TO master_host='127.0.0.1', master_port=$SERVER_MYPORT_1, master_user='root', master_log_file='master-bin.000001', master_log_pos=4;
--source include/start_slave.inc
--connection master
CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1);
--save_master_pos
--connection slave
--sync_with_master
SELECT * FROM t1 ORDER BY a;
SELECT * FROM t2;
--source include/stop_slave.inc
SET GLOBAL slave_parallel_threads=@old_parallel;
DROP TABLE t1;
--source include/start_slave.inc
--connection master
DROP TABLE t2;
--source include/rpl_end.inc