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https://issues.apache.org/jira/browse/YARN-8471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16528551#comment-16528551
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tianjuan commented on YARN-8471:
--------------------------------

sure. I reopened YARN-8193 and attached patch.

> 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-branch-2.9.0-001.patch, 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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