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From "Shiwei Guo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3933) Race condition when calling AbstractYarnScheduler.completedContainer.
Date Sat, 29 Aug 2015 04:17:47 GMT

    [ https://issues.apache.org/jira/browse/YARN-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720963#comment-14720963
] 

Shiwei Guo commented on YARN-3933:
----------------------------------

Thanks for add me to the contributer list, so exciting! 

I have noticed Jenkins' complain and submitted a new patch in [YARN-4089|https://issues.apache.org/jira/browse/YARN-4089].
And unfortunately it still not confirm to the QA standard. I'm working on it to add a unit
test for this issue, and will submit it to here soon.

> Race condition when calling AbstractYarnScheduler.completedContainer.
> ---------------------------------------------------------------------
>
>                 Key: YARN-3933
>                 URL: https://issues.apache.org/jira/browse/YARN-3933
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.5.2
>            Reporter: Lavkesh Lahngir
>            Assignee: Shiwei Guo
>              Labels: patch
>         Attachments: patch.BUGFIX-JIRA-YARN-3933.txt
>
>
> In our cluster we are seeing available memory and cores being negative. 
> Initial inspection:
> Scenario no. 1: 
> In capacity scheduler the method allocateContainersToNode() checks if 
> there are excess reservation of containers for an application, and they are no longer
needed then it calls queue.completedContainer() which causes resources being negative. And
they were never assigned in the first place. 
> I am still looking through the code. Can somebody suggest how to simulate excess containers
assignments ?



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