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https://issues.apache.org/jira/browse/ZOOKEEPER-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160513#comment-13160513
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Daniel Lord commented on ZOOKEEPER-1309:
----------------------------------------
Sorry Mahadev, I may have jumped the gun on this patch a little bit. I'm
working on getting corporate approval to submit patches for both bug fixes and
enhancements now.
> Creating a new ZooKeeper client can leak file handles
> -----------------------------------------------------
>
> Key: ZOOKEEPER-1309
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1309
> Project: ZooKeeper
> Issue Type: Bug
> Components: java client
> Affects Versions: 3.3.4
> Reporter: Daniel Lord
> Priority: Critical
> Attachments: zk-1309-1.patch
>
>
> If there is an IOException thrown by the constructor of ClientCnxn then file
> handles are leaked because of the initialization of the Selector which is
> never closed.
> final Selector selector = Selector.open();
> If there is an abnormal exit from the constructor then the Selector is not
> closed and file handles are leaked. You can easily see this by setting the
> hosts string to garbage ("qwerty", "asdf", etc.) and then try to open a new
> ZooKeeper connection. I've observed the same behavior in production when
> there were DNS issues where the host names of the ensemble can no longer be
> resolved and the application servers quickly run out of handles attempting to
> (re)connect to zookeeper.
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