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https://issues.apache.org/jira/browse/YARN-8471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16526499#comment-16526499
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Íñigo Goiri commented on YARN-8471:
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Can you also post the stack traces and describe how this can happen?
> YARN RM hangs and stops allocating resources when applications successively
> running
> -----------------------------------------------------------------------------------
>
> Key: YARN-8471
> URL: https://issues.apache.org/jira/browse/YARN-8471
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 2.9.0
> Reporter: tianjuan
> Assignee: tianjuan
> Priority: Major
> Fix For: 2.9.0
>
> Attachments: YARN-8471.001.patch
>
>
> At some point RM just hangs and stops allocating resources. At the point RM
> get hangs, YARN throws NullPointerException at
> RegularContainerAllocator#allocate, and
> RegularContainerAllocator#preCheckForPlacementSet, and
> RegularContainerAllocator#getLocalityWaitFactor.
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