Sunil G commented on YARN-3510:

Extremely Sorry [~cwelch]. Somehow it got assigned to my name when i pressed 
enter. Could you please assign it back. 

> Create an extension of ProportionalCapacityPreemptionPolicy which preempts a 
> number of containers from each application in a way which respects fairness
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-3510
>                 URL: https://issues.apache.org/jira/browse/YARN-3510
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: Craig Welch
>            Assignee: Sunil G
>         Attachments: YARN-3510.2.patch, YARN-3510.3.patch, YARN-3510.5.patch, 
> YARN-3510.6.patch
> The ProportionalCapacityPreemptionPolicy preempts as many containers from 
> applications as it can during it's preemption run.  For fifo this makes 
> sense, as it is prempting in reverse order & therefore maintaining the 
> primacy of the "oldest".  For fair ordering this does not have the desired 
> effect - instead, it should preempt a number of containers from each 
> application which maintains a fair balance /close to a fair balance between 
> them

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