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https://issues.apache.org/jira/browse/YARN-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094885#comment-14094885
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Sandy Ryza commented on YARN-2413:
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The capacity scheduler truncates all vcore requests to 0 if the
DominantResourceCalculator is not used. I think in this case it also doesn't
make an effort to respect node vcore capacities at all.
> capacity scheduler will overallocate vcores
> -------------------------------------------
>
> Key: YARN-2413
> URL: https://issues.apache.org/jira/browse/YARN-2413
> Project: Hadoop YARN
> Issue Type: Bug
> Components: 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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