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https://issues.apache.org/jira/browse/YARN-10934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423408#comment-17423408
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Benjamin Teke commented on YARN-10934:
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[~luoyuan] I'm currently looking into this issue. Do you have a way to
reproduce this issue?
> LeafQueue activateApplications NPE
> ----------------------------------
>
> Key: YARN-10934
> URL: https://issues.apache.org/jira/browse/YARN-10934
> Project: Hadoop YARN
> Issue Type: Bug
> Components: RM
> Affects Versions: 3.3.1
> Reporter: Yuan Luo
> Assignee: Benjamin Teke
> Priority: Major
> Attachments: RM-capacity-scheduler.xml, RM-yarn-site.xml
>
>
> Our prod Yarn cluster is hadoop version 3.3.1 , we changed
> DefaultResourceCalculator -> DominantResourceCalculator and restart RM, then
> our RM crashed, the Exception stack like below. I think this is a serious
> bug and hope someone can follow up and fix it.
> 2021-08-30 21:00:59,114 ERROR event.EventDispatcher
> (MarkerIgnoringBase.java:error(159)) - Error in handling event type
> APP_ATTEMPT_REMOVED to the Event Dispatcher
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.activateApplications(LeafQueue.java:868)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.removeApplicationAttempt(LeafQueue.java:1014)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.finishApplicationAttempt(LeafQueue.java:972)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.doneApplicationAttempt(CapacityScheduler.java:1188)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:1904)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:171)
> at
> org.apache.hadoop.yarn.event.EventDispatcher$EventProcessor.run(EventDispatcher.java:79)
> at java.base/java.lang.Thread.run(Thread.java:834)
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