include/master-slave.inc
[connection master]
connection server_2;
SET @old_parallel_threads=@@GLOBAL.slave_parallel_threads;
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=10;
CHANGE MASTER TO master_use_gtid=slave_pos;
include/start_slave.inc
connection server_1;
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t4 (a INT PRIMARY KEY, b INT, KEY b_idx(b)) ENGINE=InnoDB;
INSERT INTO t4 VALUES (1,NULL), (2,2), (3,NULL), (4,4), (5, NULL), (6, 6);
connect  con1,127.0.0.1,root,,test,$SERVER_MYPORT_1,;
connect  con2,127.0.0.1,root,,test,$SERVER_MYPORT_1,;
connection server_2;
include/stop_slave.inc
connection con1;
SET debug_sync='commit_after_release_LOCK_prepare_ordered SIGNAL master_queued1 WAIT_FOR master_cont1';
UPDATE t4 SET b=NULL WHERE a=6;
connection server_1;
SET debug_sync='now WAIT_FOR master_queued1';
connection con2;
SET debug_sync='commit_after_release_LOCK_prepare_ordered SIGNAL master_queued2';
DELETE FROM t4 WHERE b <= 1;
connection server_1;
SET debug_sync='now WAIT_FOR master_queued2';
SET debug_sync='now SIGNAL master_cont1';
connection con1;
connection con2;
SET debug_sync='RESET';
connection server_2;
SET @old_dbug= @@GLOBAL.debug_dbug;
SET GLOBAL debug_dbug="+d,disable_thd_need_ordering_with";
include/start_slave.inc
SET GLOBAL debug_dbug=@old_dbug;
SELECT * FROM t4 ORDER BY a;
a	b
1	NULL
2	2
3	NULL
4	4
5	NULL
6	NULL
SET @last_gtid= 'GTID';
SELECT IF(@@gtid_slave_pos LIKE CONCAT('%',@last_gtid,'%'), "GTID found ok",
CONCAT("GTID ", @last_gtid, " not found in gtid_slave_pos=", @@gtid_slave_pos))
AS result;
result
GTID found ok
SELECT "ROW FOUND" AS `Is the row found?`
  FROM mysql.gtid_slave_pos
WHERE CONCAT(domain_id, "-", server_id, "-", seq_no) = @last_gtid;
Is the row found?
ROW FOUND
connection server_2;
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=@old_parallel_threads;
include/start_slave.inc
SET DEBUG_SYNC= 'RESET';
connection server_1;
DROP TABLE t4;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
disconnect con2;
include/rpl_end.inc