Wangda Tan commented on YARN-2009:

bq. I see. I wasn't suggesting that preemption should balance all users, only 
those that are asking.

But I think we need an overhaul for user-limit related logic in CS so we can 
better balancing usages between users, which should be a part of the 
intra-queue preemption story. We can discuss more once this JIRA is done.

> Priority support for preemption in ProportionalCapacityPreemptionPolicy
> -----------------------------------------------------------------------
>                 Key: YARN-2009
>                 URL: https://issues.apache.org/jira/browse/YARN-2009
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Devaraj K
>            Assignee: Sunil G
>         Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch
> While preempting containers based on the queue ideal assignment, we may need 
> to consider preempting the low priority application containers first.

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