RESET MASTER;
CREATE TABLE t1 (a INT PRIMARY KEY, b MEDIUMTEXT) ENGINE=Innodb;
connect con1,localhost,root,,;
SET DEBUG_SYNC= "at_unlog_xa_prepare SIGNAL con1_ready WAIT_FOR con1_go";
XA START '1';
INSERT INTO t1 SET a=1;
XA END '1';
XA PREPARE '1';;
connection default;
SET DEBUG_SYNC= "now WAIT_FOR con1_ready";
FLUSH LOGS;
FLUSH LOGS;
FLUSH LOGS;
show binary logs;
Log_name	File_size
master-bin.000001	#
master-bin.000002	#
master-bin.000003	#
master-bin.000004	#
include/show_binlog_events.inc
Log_name	Pos	Event_type	Server_id	End_log_pos	Info
master-bin.000004	#	Format_desc	#	#	SERVER_VERSION, BINLOG_VERSION
master-bin.000004	#	Gtid_list	#	#	[#-#-#]
master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000001
SET DEBUG_SYNC= "now SIGNAL con1_go";
connection con1;
*** master-bin.000004 checkpoint must show up now ***
connection con1;
XA ROLLBACK '1';
SET debug_sync = 'reset';
connection default;
DROP TABLE t1;
SET debug_sync = 'reset';