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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4000) RM crashes with NPE if leaf queue becomes parent queue during restart
Date Sat, 19 Sep 2015 08:26:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14876958#comment-14876958
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Jian He commented on YARN-4000:
-------------------------------

One more issue, there may be container leak.
Depending on when NM re-register, it is possible that some containers are recovered back even
after application gets the kill signal, in which case containers are leaked.

One solution I can think of is that, given that CapacityScheduler#doneApplicationAttempt and
recoverContainersOnNode are synchronized, we can check whether RMAppAttempt is at final(FINISHED/FAILED/KILLED)
state inside recoverContainersOnNode and skip recovering this container if it is.
It would be great if you can have a test case for this.

> RM crashes with NPE if leaf queue becomes parent queue during restart
> ---------------------------------------------------------------------
>
>                 Key: YARN-4000
>                 URL: https://issues.apache.org/jira/browse/YARN-4000
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler, resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-4000.01.patch, YARN-4000.02.patch, YARN-4000.03.patch, YARN-4000.04.patch,
YARN-4000.05.patch
>
>
> This is a similar situation to YARN-2308.  If an application is active in queue A and
then the RM restarts with a changed capacity scheduler configuration where queue A becomes
a parent queue to other subqueues then the RM will crash with a NullPointerException.



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