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https://issues.apache.org/jira/browse/CURATOR-7?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622922#comment-13622922
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Shevek commented on CURATOR-7:
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See ZooKeeper-1683 for NPE in ZK itself.
> Session ids not preserved if EnsembleProvider has changed the ensemble
> ----------------------------------------------------------------------
>
> Key: CURATOR-7
> URL: https://issues.apache.org/jira/browse/CURATOR-7
> Project: Apache Curator
> Issue Type: Improvement
> Components: Client
> Affects Versions: 2.0.0
> Reporter: Shevek
> Assignee: Jordan Zimmerman
> Attachments: EnsembleProvider-zookeeper-3.5.x.patch
>
>
> See https://github.com/Netflix/curator/issues/266
> InterProcessMutex, LeaderLatch, etc use an ephemeral node. If ZooKeeper gives
> a Disconnected event, the native client reconnects with the same session id,
> and the ephemeral node is preserved. If the ensemble changes at any point
> before a Disconnect, Curator's ConnectionState#checkState() calls
> handleNewConnectionString(), which constructs a new native ZK client,
> discarding the previous session id, and losing all locks.
> This can be expensive.
> Can ConnectionState be made to preserve the session id, or be more
> conservative about discarding the entire native client on a Disconnected
> event?
> Clarifications:
> An ensemble change (e.g. adding a new node to a cluster) does not mean that
> all session ids are now invalid. The next network glitch should not break
> locks.
> There is no assumption in this description that the reconfiguration and the
> glitch/disconnection were related - they need not be.
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