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https://issues.apache.org/jira/browse/MAPREDUCE-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209464#comment-13209464
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Arun C Murthy commented on MAPREDUCE-3859:
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Hmm... maybe not.

Let me think more about it's implications on user-limit etc.
                
> CapacityScheduler incorrectly utilizes extra-resources of queue for 
> high-memory jobs
> ------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3859
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3859
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 1.0.0
>         Environment: CDH3u1
>            Reporter: Sergey Tryuber
>         Attachments: test-to-fail.patch.txt
>
>
> Imagine, we have a queue A with capacity 10 slots and 20 as extra-capacity, 
> jobs which use 3 map slots will never consume more than 9 slots, regardless 
> how many free slots on a cluster.

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