Optimistic Parallel Replication fails when gtid_slave_pos table is non transactional and binlog events are transactional

--source include/have_binlog_format_row.inc

--source include/have_innodb.inc

--source include/master-slave.inc

--sync_slave_with_master

--source include/stop_slave.inc

SET GLOBAL slave_parallel_threads=7;

set global slave_parallel_mode=optimistic;

set global slave_transaction_retries=1000;

alter table mysql.gtid_slave_pos engine=myisam;

# Create some conflicting events on master

connection master;

CREATE TABLE t1(a INT NOT NULL AUTO_INCREMENT PRIMARY KEY) engine=innodb;

INSERT INTO t1 VALUES (1),(2),(3),(4);

--disable_query_log

--let $count=5

while ($count)

{

update t1 set a=a+5 where a=1;

update t1 set a=a+5 where a=2;

update t1 set a=a+5 where a=3;

update t1 set a=a+5 where a=4;

update t1 set a=a-5 where a=5;

update t1 set a=a-5 where a=6;

--dec $count

}

--enable_query_log

select * from t1;

drop table t1;

--connection slave

start slave;

--connection master

--sync_slave_with_master

stop slave;

SET GLOBAL slave_parallel_threads=0;

set global slave_parallel_mode=conservative;

set global slave_transaction_retries=10;

start slave;

--source include/rpl_end.inc

Last_Errno      1942

Last_Error      Error during XID COMMIT: failed to update GTID state in mysql.gtid_slave_pos: 1062: Duplicate entry '0-11' for key 'PRIMARY'