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https://issues.apache.org/jira/browse/YARN-2025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14246362#comment-14246362
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Rohith commented on YARN-2025:
------------------------------

Hi [~jianhe] , I encoutered same issue even after fix YARN-2834. And I found 
the scenario for the cause of issue i.e YARN-2340. We shall discuss more on 
yarn-2340.

> Possible NPE in schedulers#addApplicationAttempt()
> --------------------------------------------------
>
>                 Key: YARN-2025
>                 URL: https://issues.apache.org/jira/browse/YARN-2025
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-2025.1.patch
>
>
> In FifoScheduler/FairScheduler/CapacityScheduler#addApplicationAttempt(), we 
> don't check whether {{application}} is null. This can cause NPE in following 
> sequences: addApplication() -> doneApplication() (e.g. AppKilledTransition) 
> -> addApplicationAttempt().
> {code}
>     SchedulerApplication application =
>         applications.get(applicationAttemptId.getApplicationId());
>     String user = application.getUser();
> {code}



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