CREATE TABLE t1 (a VARCHAR(10) PRIMARY KEY) ENGINE=innodb;
INSERT INTO t1 VALUES(100);
SELECT variable_value INTO @commits FROM information_schema.global_status
WHERE variable_name = 'binlog_commits';
SELECT variable_value INTO @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
connect con1,localhost,root,,;
connect con2,localhost,root,,;
connect con3,localhost,root,,;
connect con4,localhost,root,,;
connect con5,localhost,root,,;
connect con6,localhost,root,,;
connection con1;
SET DEBUG_SYNC= "commit_before_get_LOCK_after_binlog_sync SIGNAL group1_running WAIT_FOR group2_queued";
INSERT INTO t1 VALUES ("con1");
connection con2;
set DEBUG_SYNC= "now WAIT_FOR group1_running";
SET DEBUG_SYNC= "commit_after_prepare_ordered SIGNAL group2_con2";
SET DEBUG_SYNC= "commit_before_get_LOCK_after_binlog_sync SIGNAL group2_running";
SET DEBUG_SYNC= "commit_after_release_LOCK_log WAIT_FOR group3_committed";
SET DEBUG_SYNC= "commit_after_group_run_commit_ordered SIGNAL group2_visible WAIT_FOR group2_checked";
INSERT INTO t1 VALUES ("con2");
connection con3;
SET DEBUG_SYNC= "now WAIT_FOR group2_con2";
SET DEBUG_SYNC= "commit_after_prepare_ordered SIGNAL group2_con3";
INSERT INTO t1 VALUES ("con3");
connection con4;
SET DEBUG_SYNC= "now WAIT_FOR group2_con3";
SET DEBUG_SYNC= "commit_after_prepare_ordered SIGNAL group2_con4";
INSERT INTO t1 VALUES ("con4");
connection default;
SET DEBUG_SYNC= "now WAIT_FOR group2_con4";
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
SELECT * FROM t1 ORDER BY a;
a
100
SET DEBUG_SYNC= "now SIGNAL group2_queued";
connection con1;
connection default;
SELECT * FROM t1 ORDER BY a;
a
100
con1
connection con5;
SET DEBUG_SYNC= "commit_before_get_LOCK_after_binlog_sync SIGNAL group3_con5";
SET DEBUG_SYNC= "commit_after_get_LOCK_log SIGNAL con5_leader WAIT_FOR con6_queued";
set DEBUG_SYNC= "now WAIT_FOR group2_running";
INSERT INTO t1 VALUES ("con5");
connection con6;
SET DEBUG_SYNC= "now WAIT_FOR con5_leader";
SET DEBUG_SYNC= "commit_after_prepare_ordered SIGNAL con6_queued";
INSERT INTO t1 VALUES ("con6");
connection default;
SET DEBUG_SYNC= "now WAIT_FOR group3_con5";
SELECT * FROM t1 ORDER BY a;
a
100
con1
SET DEBUG_SYNC= "now SIGNAL group3_committed";
SET DEBUG_SYNC= "now WAIT_FOR group2_visible";
SELECT * FROM t1 ORDER BY a;
a
100
con1
con2
con3
con4
SET DEBUG_SYNC= "now SIGNAL group2_checked";
connection con2;
connection con3;
connection con4;
connection con5;
connection con6;
connection default;
SELECT * FROM t1 ORDER BY a;
a
100
con1
con2
con3
con4
con5
con6
SELECT variable_value - @commits FROM information_schema.global_status
WHERE variable_name = 'binlog_commits';
variable_value - @commits
6
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
3
SET DEBUG_SYNC= 'RESET';
DROP TABLE t1;