ERROR 3021 (HY000): This operation cannot be performed with a running slave io thread； run STOP SLAV

在mysql主从复制的时候，使用change to改变主从信息的时候，却发现change不了

提示

ERROR 3021 (HY000): This operation cannot be performed with a running slave io thread; run STOP SLAV

ERROR 3021 (HY000):此操作不能在运行的从io线程中执行;运行停止slave

原因很简单，我们需要，先stop slave;先把slave stop掉然后再使用change就可以了。

change完之后，记得start slave; 开启slave

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