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https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15494454#comment-15494454
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Wangda Tan commented on YARN-4945:
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[~eepayne],
bq. I need to understand what it would mean to combine all intra-queue priority
policies into one.
To clarify, we may not combine *all* intra-queue policies into one, but if you
look at queue internal policies. There are majorly two groups:
1) Fair + user-limit + priority
2) Fifo + user-limit + priority
User-limit and priority will be always on and ordering policy like Fair/Fifo is
a changeable config. So it makes sense to me to have two different policies,
one for Fifo (plus priority/UL) and Fair (same plus priority/UL)
bq. If they are combined, then is it still necessary to make
IntraQueuePreemptionPolicy an interface?
As I mentioned above, we can have a fair intra-queue policy.
To be honest, I haven't thought a good way that a list of policies can better
solve the priority + user-limit preemption problem. Could you share some ideas
about it. For example, how to better consider both in the final decision
> [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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