Wangda Tan resolved YARN-685.
    Resolution: Invalid

According to test result from [~raviprak], CS fairly distributes reducers to 
NMs in the cluster. Resolving this as invalid and please reopen this if you 
still think this is a problem.

> Capacity Scheduler is not distributing the reducers tasks across the cluster
> ----------------------------------------------------------------------------
>                 Key: YARN-685
>                 URL: https://issues.apache.org/jira/browse/YARN-685
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.0.4-alpha
>            Reporter: Devaraj K
> If we have reducers whose total memory required to complete is less than the 
> total cluster memory, it is not assigning the reducers to all the nodes 
> uniformly(~uniformly). Also at that time there are no other jobs or job tasks 
> running in the cluster.

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