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https://issues.apache.org/jira/browse/YARN-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14571575#comment-14571575
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Wangda Tan commented on YARN-3510:
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[~sunilg],
bq. and in general if the new approach gives a more fair preemption, then we
can move to that.
The approach mentioend by [~cwelch] at
https://issues.apache.org/jira/browse/YARN-3510?focusedCommentId=14571405&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14571405
is the "true fair". You can come back to look at the patch once it is uploaded.
> 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: Craig Welch
> 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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