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https://issues.apache.org/jira/browse/YARN-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976438#comment-16976438
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Sunil G commented on YARN-9984:
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This is straightforward one. I think UT may be tougher on this.
Since its a null check, lets get this in. +1
I will commit this later today if there are no objection.
> FSPreemptionThread crash with NullPointerException
> --------------------------------------------------
>
> Key: YARN-9984
> URL: https://issues.apache.org/jira/browse/YARN-9984
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 3.0.0
> Reporter: Wilfred Spiegelenburg
> Assignee: Wilfred Spiegelenburg
> Priority: Major
> Attachments: YARN-9984.001.patch
>
>
> When an application is unregistered there is a chance that there are still
> containers running on a node for that application. In all cases we handle the
> application missing from the RM gracefully (log a message and continue)
> except for the FS pre-emption thread.
> In case the application is removed but some containers are still linked to a
> node the FSPreemptionThread will crash with a NPE when it tries to retrieve
> the application id for the attempt:
> {code:java}
> FSAppAttempt app =
> scheduler.getSchedulerApp(container.getApplicationAttemptId());
> ApplicationId appId = app.getApplicationId();{code}
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