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https://issues.apache.org/jira/browse/YARN-9857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16938136#comment-16938136
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Ahmed Hussein commented on YARN-9857:
-------------------------------------
[~ebadger] the test does not fail.
While I was investigating some intermittent failures with other test case, I
noticed NullPointerException in the log files coming from
{{TestDelegationTokenRenewer}}. I thought to get rid of NPEs to make the JUnit
cleaner and easier to debug.
> TestDelegationTokenRenewer throws NPE but tests pass
> ----------------------------------------------------
>
> Key: YARN-9857
> URL: https://issues.apache.org/jira/browse/YARN-9857
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Minor
> Attachments: YARN-9857.001.patch
>
>
> {{TestDelegationTokenRenewer}} throws some NPEs:
> {code:bash}
> 2019-09-25 12:51:23,446 WARN [pool-19-thread-2]
> security.DelegationTokenRenewer
> (DelegationTokenRenewer.java:handleDTRenewerAppSubmitEvent(945)) - Unable to
> add the application to the delegation token renewer.
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.handleDTRenewerAppSubmitEvent(DelegationTokenRenewer.java:942)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.run(DelegationTokenRenewer.java:918)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> 2019-09-25 12:51:23,446 DEBUG [main] util.MBeans
> (MBeans.java:unregister(138)) - Unregistering
> Hadoop:service=ResourceManager,name=CapacitySchedulerMetrics
> Exception in thread "pool-19-thread-2" java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.handleDTRenewerAppSubmitEvent(DelegationTokenRenewer.java:951)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.run(DelegationTokenRenewer.java:918)
> 2019-09-25 12:51:23,447 DEBUG [main] util.MBeans
> (MBeans.java:unregister(138)) - Unregistering
> Hadoop:service=ResourceManager,name=MetricsSystem,sub=Stats
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> 2019-09-25 12:51:23,447 INFO [main] impl.MetricsSystemImpl
> (MetricsSystemImpl.java:stop(216)) - ResourceManager metrics system stopped.
> {code}
> the RMContext dispatcher is not set for the RMMock which results in NPE
> accessing the event handler of the dispatcher inside
> {{DelegationTokenRenewer}}.
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