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https://issues.apache.org/jira/browse/YARN-2440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107057#comment-14107057
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Jason Lowe commented on YARN-2440:
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I think cfs_quota_us has a maximum value of 1000000, so we may have an issue if 
vcores>10.

I don't see how this takes into account the mapping of vcores to actual CPUs.   
It's not safe to assume 1 vcore == 1 physical CPU, as some sites will map 
multiple vcores to a physical core to allow fractions of a physical CPU to be 
allocated or to account for varying CPU performance across a heterogeneous 
cluster.

> Cgroups should limit YARN containers to cores allocated in yarn-site.xml
> ------------------------------------------------------------------------
>
>                 Key: YARN-2440
>                 URL: https://issues.apache.org/jira/browse/YARN-2440
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>         Attachments: apache-yarn-2440.0.patch, 
> screenshot-current-implementation.jpg
>
>
> The current cgroups implementation does not limit YARN containers to the 
> cores allocated in yarn-site.xml.



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