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https://issues.apache.org/jira/browse/ZOOKEEPER-914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925843#action_12925843
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Patrick Hunt commented on ZOOKEEPER-914:
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Flavio in item 2 you mention "mock", consider using mockito, I've had alot of
luck with that personally, also Hadoop itself has moved to using this in it's
tests. http://code.google.com/p/mockito/
> QuorumCnxManager blocks forever
> --------------------------------
>
> Key: ZOOKEEPER-914
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-914
> Project: Zookeeper
> Issue Type: Bug
> Components: leaderElection
> Reporter: Vishal K
> Assignee: Vishal K
> Priority: Blocker
> Fix For: 3.3.3, 3.4.0
>
>
> This was a disaster. While testing our application we ran into a scenario
> where a rebooted follower could not join the cluster. Further debugging
> showed that the follower could not join because the QuorumCnxManager on the
> leader was blocked for indefinite amount of time in receiveConnect()
> "Thread-3" prio=10 tid=0x00007fa920005800 nid=0x11bb runnable
> [0x00007fa9275ed000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.FileDispatcher.read0(Native Method)
> at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
> at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
> at sun.nio.ch.IOUtil.read(IOUtil.java:206)
> at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:236)
> - locked <0x00007fa93315f988> (a java.lang.Object)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager.receiveConnection(QuorumCnxManager.java:210)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager$Listener.run(QuorumCnxManager.java:501)
> I had pointed out this bug along with several other problems in
> QuorumCnxManager earlier in
> https://issues.apache.org/jira/browse/ZOOKEEPER-900 and
> https://issues.apache.org/jira/browse/ZOOKEEPER-822.
> I forgot to patch this one as a part of ZOOKEEPER-822. I am working on a fix
> and a patch will be out soon.
> The problem is that QuorumCnxManager is using SocketChannel in blocking mode.
> It does a read() in receiveConnection() and a write() in initiateConnection().
> Sorry, but this is really bad programming. Also, points out to lack of
> failure tests for QuorumCnxManager.
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