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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2113) Add cross-user preemption within CapacityScheduler's leaf-queue
Date Wed, 26 Apr 2017 15:51:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985032#comment-15985032
] 

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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