Last_Errno: 1755 Last_Error: Cannot execute the current event group in the parallel mode错误解决

MySQL5.6迁移至5.7，常用的方法是新搭建5.7作为5.6的从库。start slave时遇到报错：

    Slave_IO_Running: Yes
    Slave_SQL_Running: No
    ……
    Last_Errno: 1755
    Last_Error: Cannot execute the current event group in the parallel mode. Encountered event Gtid, relay-log name ./mysql-relay.000002, position 123321 which prevents execution of this event group in parallel mode. Reason: The master event is logically timestamped incorrectly...

从MySQL官网搜索1755的报错看到是并行复制bug导致的报错。想要解决的办法也很简单，直接关掉并行复制即可。

stop slave;
set global slave_parallel_workers=0;
start slave;

可以参考官方文档

https://bugs.mysql.com/bug.php?id=71495