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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4000) RM crashes with NPE if leaf queue becomes parent queue during restart
Date Tue, 15 Sep 2015 10:57:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14745242#comment-14745242
] 

Varun Saxena commented on YARN-4000:
------------------------------------

Thanks [~jianhe] for the review. 
Regarding appDiagnosticsBeforeKilling, it was used because we normally update diagnostics
only after it has been stored in state store i.e. in FINAL_SAVING transition. And this step
would happen only after attempt has been killed. At this point we do not have access to original
app kill event.

Is it fine to update the diagnostics when app is in KILLING state ? I guess should be. Your
thoughts ?

> 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
>
>
> 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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