[jira] [Commented] (YARN-3933) Race condition when calling AbstractYarnScheduler.completedContainer.

["Sunil G (JIRA)" <ji...@apache.org>]

    [ 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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