ASF GitHub Bot commented on NIFI-3993:

GitHub user HorizonNet opened a pull request:


    NIFI-3993 Updated the ZooKeeper version to 3.4.10

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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ultratendency/nifi NIFI-3993

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2884
commit 51bef0752de1a86b3d3173437ddcc4266b3f5905
Author: Jan Hentschel <jan.hentschel@...>
Date:   2018-07-12T11:47:05Z

    NIFI-3993 Updated the ZooKeeper version to 3.4.10


> Upgrade embedded ZooKeeper version
> ----------------------------------
>                 Key: NIFI-3993
>                 URL: https://issues.apache.org/jira/browse/NIFI-3993
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.2.0
>            Reporter: Mark Bean
>            Priority: Major
> In a Cluster configuration, Nodes are periodically disconnected from the 
> Cluster, and then reconnected. These events correspond to the following error:
> ERROR [CommitProcessor:1] o.apache.zookeeper.server.NIOServerCnxn Unexpected 
> Exception:
> java.nio.channels.CancelledKeyException: null
>         at sun.nio.ch.SelectionKeyImpl.ensureValid(SectionKeyImpl.java:73)
>         at sun.nio.ch.SelectionKeyImpl.interestOps(SelctionKeyImpl.java:77)
>         at 
> org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:151)
>         at 
> org.apache.zookeeper.server.NIOServerCnXn.sendResopnse(NIOServerCnxn.java:1081)
>         at 
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:404)
>         at 
> org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:74)
> This error was reported in ZooKeeper JIRA [1], and reported as fixed in 
> version 3.4.10, the current stable build. As additional confirmation, when 
> using a stand-alone ZK, 3.4.10, rather than the embedded ZK, the above error 
> was no longer observed.
> Update NiFi to use ZK 3.4.10
> [1] https://issues.apache.org/jira/browse/ZOOKEEPER-2044

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