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https://issues.apache.org/jira/browse/YARN-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524261#comment-14524261
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Junping Du commented on YARN-2413:
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This is more like a documentation bug, we should make user to get clear how 
DefaultResourceCalculator and DominantResourceCalculator work and expectation.

> capacity scheduler will overallocate vcores
> -------------------------------------------
>
>                 Key: YARN-2413
>                 URL: https://issues.apache.org/jira/browse/YARN-2413
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: documentation, scheduler
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Allen Wittenauer
>            Priority: Critical
>
> It doesn't appear that the capacity scheduler is properly allocating vcores 
> when making scheduling decisions, which may result in overallocation of CPU 
> resources.



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