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CREATE TABLE t1 (c1 INT) Engine=InnoDB; CREATE TABLE t2 (c1 INT) Engine=InnoDB; SET GLOBAL binlog_group_commit_sync_delay=1000000; SET GLOBAL binlog_group_commit_sync_no_delay_count=2; ######################## ASSERTION #1 ##################################### SET DEBUG_SYNC='bgc_after_flush_stage_before_sync_stage SIGNAL go_con2_to_flush WAIT_FOR go_con1_to_sync'; ============== CON1: FLUSHed and REAPed the QUEUE Waiting for CON2 to get to the FLUSH stage ============ SET @clock_in = SYSDATE(); INSERT INTO t1 VALUES (1); SET DEBUG_SYNC='bgc_before_flush_stage SIGNAL go_con1_to_sync WAIT_FOR go_con2_to_flush'; SET DEBUG_SYNC='bgc_after_flush_stage_before_sync_stage WAIT_FOR go_con2_to_sync'; ============== CON2: WILL FLUSH and REAP the QUEUE but only after CON1 has waited and signaled CON2 ============ SET @clock_in = SYSDATE(); INSERT INTO t2 VALUES (2); SET @elapsed = TIMESTAMPDIFF(MICROSECOND, @clock_in, SYSDATE()); ============== CON1: signal CON2 to resume and go into SYNC stage ============ SET DEBUG_SYNC = "now SIGNAL go_con2_to_sync"; include/assert.inc ["Assert that con1 statement took more than the delay set."] ============== CON2: RESUMES ============ SET @elapsed = TIMESTAMPDIFF(MICROSECOND, @clock_in, SYSDATE()); include/assert.inc ["Assert that con2 statement took more than the delay set."] ######################## ASSERTION #2 ##################################### SET GLOBAL DEBUG="d,bgc_set_infinite_delay"; ============== CON1: enters wait_count_or_timeout waits for CON2 to enroll for the SYNC stage ============ SET DEBUG_SYNC='bgc_after_flush_stage_before_sync_stage WAIT_FOR go_con1_to_wait'; SET DEBUG_SYNC='bgc_wait_count_or_timeout SIGNAL go_con2_to_flush WAIT_FOR go_con1_resume_wait'; SET @clock_in = SYSDATE(); INSERT INTO t1 VALUES (1); ============== CON2: signals CON1 that it has enrolled for the SYNC stage ============ SET DEBUG_SYNC='bgc_before_flush_stage SIGNAL go_con1_to_wait WAIT_FOR go_con2_to_flush'; SET DEBUG_SYNC='bgc_after_enrolling_for_sync_stage SIGNAL go_con1_resume_wait'; INSERT INTO t2 VALUES (2); SET GLOBAL DEBUG="";; SET GLOBAL binlog_group_commit_sync_no_delay_count=0; SET GLOBAL binlog_group_commit_sync_delay=0; DROP TABLE t1, t2;