Say I have a quorum of four ZooKeeper servers. Is there any way I can add a
fifth ZooKeeper to the quorum without interrupting the service? I see some
work on making it easy
here<https://issues.apache.org/jira/browse/ZOOKEEPER-107>and
here<https://cwiki.apache.org/confluence/display/ZOOKEEPER/ClusterMembership>,
but I'm wondering if there's currently any way to do it at all. Would it
work to start up the fifth pointing to all of the others, then one-by-one
restart the others, updating their configuration to include the fifth?
