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https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15494187#comment-15494187
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Wangda Tan commented on YARN-4945:
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[~eepayne] / [~sunilg],
For the suggestion from [~eepayne]:
bq. I think that the objects that implement the IntraQueuePreemptionPolicy
interface should be in in a List<IntraQueuePreemptionPolicy>, and then
IntraQueueCandidatesSelector#selectCandidates should loop over the list to
process the different policies.
I would say it may not be necessarily to have two separate policies to consider
priority and user-limit. In my existing rough thinking, only minor changes
required to support FIFO + Priority + user-limit intra-queue preemption, if it
is really required, we can refactor this part when we move to user-limit
preemption.
The other reason is the two intra-queue preemption policy (user-limit /
priority) can affect to each other, we cannot do priority preemption without
considering user-limit, and vice versa. So if we can consider both with a
reasonable code complexity, why not :)?
> [Umbrella] Capacity Scheduler Preemption Within a queue
> -------------------------------------------------------
>
> Key: YARN-4945
> URL: https://issues.apache.org/jira/browse/YARN-4945
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Wangda Tan
> Attachments: Intra-Queue Preemption Use Cases.pdf,
> IntraQueuepreemption-CapacityScheduler (Design).pdf, YARN-2009-wip.2.patch,
> YARN-2009-wip.patch, YARN-2009-wip.v3.patch, YARN-2009.v0.patch,
> YARN-2009.v1.patch, YARN-2009.v2.patch
>
>
> This is umbrella ticket to track efforts of preemption within a queue to
> support features like:
> YARN-2009. YARN-2113. YARN-4781.
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