MySQL 5.7 Release Notes
STOP GROUP_REPLICATION
Stops Group Replication. This statement requires the
GROUP_REPLICATION_ADMIN or
SUPER privilege. As soon as you
issue STOP GROUP_REPLICATION the
member is set to
super_read_only=ON, which
ensures that no writes can be made to the member while Group
Replication stops. Any other replication channels running on the
member are also stopped.
Warning
Use this statement with extreme caution because it removes the server instance from the group, meaning it is no longer protected by Group Replication's consistency guarantee mechanisms. To be completely safe, ensure that your applications can no longer connect to the instance before issuing this statement to avoid any chance of stale reads.