CREATE TABLE t(id INT PRIMARY KEY, v INT NOT NULL) ENGINE INNODB;
INSERT INTO t VALUES(1, 100), (2, 100), (3, 100), (4, 100);
SET GLOBAL binlog_group_commit_sync_delay = 8;
SET GLOBAL binlog_group_commit_sync_no_delay_count = 2;
BEGIN;
UPDATE t set v = v + 100 WHERE id = 1;
COMMIT;
SET GLOBAL binlog_group_commit_sync_delay = 8;
SET GLOBAL binlog_group_commit_sync_no_delay_count = 0;
BEGIN;
UPDATE t set v = v + 100 WHERE id = 3;
COMMIT;
SET GLOBAL binlog_group_commit_sync_delay=0;
DROP TABLE t;