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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3933) Race condition when calling AbstractYarnScheduler.completedContainer.
Date Thu, 16 Jun 2016 18:12:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15334352#comment-15334352
] 

Sunil G commented on YARN-3933:
-------------------------------

Hi [~guoshiwei]
Could you pls help to share a patch as we discussed. If you have no bandwidth, I could help
to provide the same.

> 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: fairscheduler
>    Affects Versions: 2.6.0, 2.7.0, 2.5.2, 2.7.1
>            Reporter: Lavkesh Lahngir
>            Assignee: Shiwei Guo
>         Attachments: YARN-3933.001.patch, YARN-3933.002.patch, YARN-3933.003.patch
>
>
> 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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