mysql双向同步赋权限

今天做支撑发现，两台双向同步的mysql明明都相互赋了权限，但是有一台同步就是出错，后台日志显现：

Error reading packet from server: Access denied; you need the REPLICATION SLAVE privilege for this operation

 

无奈之下，在另一台执行如下操作后报错消失：

grant REPLICATION SLAVE on *.* to ‘root' @' %' identified by ‘password';