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https://issues.apache.org/jira/browse/NIFI-3993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554449#comment-16554449
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ASF GitHub Bot commented on NIFI-3993:
--------------------------------------
Github user jtstorck commented on the issue:
https://github.com/apache/nifi/pull/2884
@HorizonNet I'm not familiar with the issue described in NIFI-3993, or what
scenarios cause it to happen. I did read [the referenced
JIRA](https://issues.apache.org/jira/browse/ZOOKEEPER-2044), which states that
it's a cosmetic error, so we'd need to investigate further to determine its
impact on NiFi.
> 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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