include/master-slave.inc
[connection master]
connection slave;
include/stop_slave.inc
SET @old_parallel_threads= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=3;
SET @old_parallel_mode= @@GLOBAL.slave_parallel_mode;
SET GLOBAL slave_parallel_mode=aggressive;
SET @old_dbug= @@GLOBAL.debug_dbug;
CHANGE MASTER TO master_use_gtid=slave_pos;
include/start_slave.inc
*** MDEV-31509: Lost data with FTWRL and STOP SLAVE
connection master;
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=InnoDB;
CREATE TABLE t2 (a INT PRIMARY KEY, b INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (0,0);
INSERT INTO t2 VALUES (0,0);
include/save_master_gtid.inc
connection slave;
include/sync_with_master_gtid.inc
connection slave;
*** Arrange for T1 to delay before entering GCO wait.
SET GLOBAL debug_dbug="+d,gco_wait_delay_gtid_0_x_99";
*** Arrange for T2 to wait for FTWRL to start.
SET GLOBAL debug_dbug="+d,hold_worker_on_schedule";
*** Arrange for T2 to delay wakeup from FTWRL pause.
SET GLOBAL debug_dbug="+d,delay_ftwrl_wait_gtid_0_x_100";
connection master;
*** Event group T1
SET SESSION gtid_seq_no=99;
INSERT INTO t1 VALUES (1,1);
connection slave;
*** 1a. Wait for T1 to be queued.
SET debug_sync="now WAIT_FOR gco_wait_paused";
connection master;
*** Event group T2
SET SESSION gtid_seq_no=100;
INSERT INTO t2 VALUES (2,2);
connection slave;
*** 1b. Wait for T2 to be queued.
SET debug_sync= "now WAIT_FOR reached_pause";
connection slave1;
*** 2. Run FTWRL
SET GLOBAL debug_dbug= "+d,pause_for_ftwrl_wait";
FLUSH TABLES WITH READ LOCK;
connection slave;
SET debug_sync= "now WAIT_FOR pause_ftwrl_waiting";
*** 3. Wait for T2 to be waiting for FTWRL pause
SET debug_sync= "now SIGNAL continue_worker";
*** 4. FTWRL completes, UNLOCK TABLES.
SET debug_sync="now SIGNAL pause_ftwrl_cont";
connection slave1;
UNLOCK TABLES;
connection slave;
*** T2 is now ready to proceed after FTWRL pause, but did not wake up yet.
SET debug_sync="now WAIT_FOR pause_wait_started";
*** 5. STOP SLAVE is run.
connection slave1;
SET GLOBAL debug_dbug="+d,rpl_parallel_wait_for_done_trigger";
STOP SLAVE;
connection slave;
SET debug_sync="now WAIT_FOR wait_for_done_waiting";
*** 5. T2 wakes up after FTWRL pause, reaches wait_for_prior_commit().
SET debug_sync="now SIGNAL pause_wait_continue";
*** 6. T1 starts.
SET debug_sync="now SIGNAL gco_wait_cont";
connection slave1;
connection slave;
include/wait_for_slave_to_stop.inc
connection master;
SELECT * FROM t1 ORDER BY a;
a	b
0	0
1	1
SELECT * FROM t2 ORDER BY a;
a	b
0	0
2	2
include/save_master_gtid.inc
connection slave;
include/start_slave.inc
include/sync_with_master_gtid.inc
SELECT @@GLOBAL.gtid_slave_pos;
@@GLOBAL.gtid_slave_pos
0-1-100
SELECT * FROM t1 ORDER BY a;
a	b
0	0
1	1
SELECT * FROM t2 ORDER BY a;
a	b
0	0
2	2
*** Clean up.
connection slave;
include/stop_slave.inc
SET DEBUG_SYNC= "RESET";
SET GLOBAL slave_parallel_threads= @old_parallel_threads;
SET GLOBAL slave_parallel_mode= @old_parallel_mode;
SET GLOBAL debug_dbug=@old_dbug;
include/start_slave.inc
connection master;
DROP TABLE t1, t2;
include/rpl_end.inc