[jira] [Created] (NIFI-10414) Zookeeper/Curator NPE during pod restarts in K8S environment/Openshift

["Joe Witt (Jira)" <ji...@apache.org>]

Joe Witt created NIFI-10414:
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             Summary: Zookeeper/Curator NPE during pod restarts in K8S environment/Openshift
                 Key: NIFI-10414
                 URL: https://issues.apache.org/jira/browse/NIFI-10414
             Project: Apache NiFi
          Issue Type: Bug
    Affects Versions: 1.16.1
         Environment:  NiFi 1.16.1 on RedHat OpenShift 4.9
            Reporter: Joe Witt


Walter Moar
  10:51 AM
Hello, I'm running NiFi 1.16.1 on RedHat OpenShift 4.9. I'm seeing the behaviour that when OpenShift operations cause Zookeeper pod restarts, the NiFi cluster loses its controller. When this happens I have to scale down the NiFi pods and then back up again. The error in the logs is:
2022-08-30 17:02:19,452 ERROR [main-EventThread] o.a.c.f.imps.CuratorFrameworkImpl Background exception was not retry-able or retry gave up
java.lang.NullPointerException: null
        at org.apache.curator.utils.Compatibility.getHostAddress(Compatibility.java:116)
        at org.apache.curator.framework.imps.EnsembleTracker.configToConnectionString(EnsembleTracker.java:185)
        at org.apache.curator.framework.imps.EnsembleTracker.processConfigData(EnsembleTracker.java:206)
        at org.apache.curator.framework.imps.EnsembleTracker.access$300(EnsembleTracker.java:50)
        at org.apache.curator.framework.imps.EnsembleTracker$2.processResult(EnsembleTracker.java:150)
        at org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:926)
        at org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:683)
        at org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:152)
        at org.apache.curator.framework.imps.GetConfigBuilderImpl$2.processResult(GetConfigBuilderImpl.java:222)
        at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:598)
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)


The NPE should be fixed by https://issues.apache.org/jira/browse/CURATOR-538

Once CURATOR-538 lands we need to pull in the new curator version.  This should address the issue seen above but may expose something else.



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