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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985032#comment-15985032
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Eric Payne commented on YARN-2113:
----------------------------------
[~sunilg], the latest patch seems to work almost as I expect. However, I still
have one question.
When the {{preemption-order}} property is set to {{USERLIMIT_FIRST}}, priority
preemption will not happen. For Example:
- {{preemption-order = USERLIMIT_FIRST}}
- {{user1}} starts {{app1}} at priority 0 and consumes the whole cluster
- {{user1}} starts {{app2}} at priority 1
In this scenario, no preemption occurs. Is that expected? I don't expect this
behavior, since if {{preemption-order = PRIORITY_FIRST}}, user-limit preemption
will still happen as expected when all apps are the same priority.
> Add cross-user preemption within CapacityScheduler's leaf-queue
> ---------------------------------------------------------------
>
> Key: YARN-2113
> URL: https://issues.apache.org/jira/browse/YARN-2113
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: scheduler
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Sunil G
> Attachments: IntraQueue Preemption-Impact Analysis.pdf,
> TestNoIntraQueuePreemptionIfBelowUserLimitAndDifferentPrioritiesWithExtraUsers.txt,
> YARN-2113.0001.patch, YARN-2113.0002.patch, YARN-2113.0003.patch,
> YARN-2113.0004.patch, YARN-2113.0005.patch, YARN-2113.0006.patch,
> YARN-2113.0007.patch, YARN-2113.0008.patch, YARN-2113.0009.patch,
> YARN-2113.0010.patch, YARN-2113.0011.patch, YARN-2113.v0.patch
>
>
> Preemption today only works across queues and moves around resources across
> queues per demand and usage. We should also have user-level preemption within
> a queue, to balance capacity across users in a predictable manner.
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