[NIFI-3993] Upgrade embedded ZooKeeper version

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 1.2.0
• Component/s: Core Framework
• Assignee: Unassigned
• Reporter: Mark Bean
• Created: 30/May/17 15:18
• Updated: 16/Mar/21 20:35
• Resolved: 16/Mar/21 20:35

Description

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

Issue Links

• links to: GitHub Pull Request #2884
• links to: GitHub Pull Request #2884