MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0
STOP GROUP_REPLICATION
Stops Group Replication. This statement requires the
GROUP_REPLICATION_ADMIN privilege
(or the deprecated 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. Any user credentials that you specified
on the START GROUP_REPLICATION
statement when starting Group Replication on this member are
removed from memory, and must be supplied when you start Group
Replication again.
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.