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https://issues.apache.org/jira/browse/YARN-4355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278510#comment-15278510
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Daniel Templeton commented on YARN-4355:
----------------------------------------

Two meta-comments:

* Should the log messages really be WARN?  What will the admin do about it?
* Can we write out heartbeat instead of HB?  Even knowing what we're talking 
about, it took me an embarrassing amount of puzzling to figure out what HB 
stands for.  History....???

> NPE while processing localizer heartbeat
> ----------------------------------------
>
>                 Key: YARN-4355
>                 URL: https://issues.apache.org/jira/browse/YARN-4355
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.7.2
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-4355.01.patch
>
>
> While analyzing YARN-4354 I noticed a nodemanager was getting NPEs while 
> processing a private localizer heartbeat.  I think there's a race where we 
> can cleanup resources for an application and therefore remove the app local 
> resource tracker just as we are trying to handle the localizer heartbeat.



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