[jira] [Created] (ZOOKEEPER-1727) Doc request: The right way to expand a cluster

["Justin SB (JIRA)" <ji...@apache.org>]

Justin SB created ZOOKEEPER-1727:
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             Summary: Doc request: The right way to expand a cluster
                 Key: ZOOKEEPER-1727
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1727
             Project: ZooKeeper
          Issue Type: Wish
    Affects Versions: 3.5.0
            Reporter: Justin SB
            Priority: Minor


When expanding a cluster from 2->3, if ZK server #3 isn't up yet, then it seems that the reconfig request times out with a connection-loss error.  The configuration is updated though.  So we could wait, reconnect, and then refetch the config to make sure we did join the quorum, though that seems a little bit hacky!

What is correct way to do this (and cluster growth in general)?  Should we bring up new ZK servers before issuing the reconfig command?  What is the right way to bring up new ZK servers (connect as a client, request the config, save the config to the zk.conf.dynamic file, add our new server line to the new zk.conf.dynamic file, start the new server, call reconfig as a client to the existing cluster)?

Is this documented anywhere? (Just the steps to do it "the right way" would be great, no need for actual code) :-)

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