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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-3933) Race condition when calling AbstractYarnScheduler.completedContainer.
Date Fri, 28 Aug 2015 14:50:46 GMT

     [ https://issues.apache.org/jira/browse/YARN-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated YARN-3933:
-----------------------------
    Summary: Race condition when calling AbstractYarnScheduler.completedContainer.  (was:
Resources(both core and memory) are being negative)

> 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: Lavkesh Lahngir
>              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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