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From "Wilfred Spiegelenburg (Jira)" <j...@apache.org>
Subject [jira] [Created] (YARN-9984) FSPreemptionThread crash with NullPointerException
Date Mon, 18 Nov 2019 01:33:00 GMT
Wilfred Spiegelenburg created YARN-9984:

             Summary: 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

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:
FSAppAttempt app =
ApplicationId appId = app.getApplicationId();{code}

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