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https://issues.apache.org/jira/browse/YARN-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14719298#comment-14719298
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Junping Du commented on YARN-3933:
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Looks like you are not YARN contributors yet, adding you to this elite group. :)
> 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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