Mark Bean created NIFI-3993:
-------------------------------
Summary: 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
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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