Arun C Murthy resolved YARN-751.

    Resolution: Invalid

I verified that this doesn't happen in YARN. The user-limit computation is 
significantly different and hence a non-issue.
> CLONE - CapacityScheduler incorrectly utilizes extra-resources of queue for 
> high-memory jobs
> --------------------------------------------------------------------------------------------
>                 Key: YARN-751
>                 URL: https://issues.apache.org/jira/browse/YARN-751
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sergey Tryuber
>            Assignee: Arun C Murthy
>             Fix For: 2.1.0-beta
> 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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