Sandy Ryza commented on YARN-2413:

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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