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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4781) Support intra-queue preemption for fairness ordering policy.
Date Fri, 01 Jun 2018 20:21:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498517#comment-16498517
] 

Eric Payne commented on YARN-4781:
----------------------------------

bq. Thank you. I ll commit this to branch-2 shortly.
Thanks [~sunilg]. I would like to keep branch-2, branch-2.9 and branch-2.8 in sync with the
3.x branches as much as possible.

> Support intra-queue preemption for fairness ordering policy.
> ------------------------------------------------------------
>
>                 Key: YARN-4781
>                 URL: https://issues.apache.org/jira/browse/YARN-4781
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Wangda Tan
>            Assignee: Eric Payne
>            Priority: Major
>             Fix For: 3.0.3
>
>         Attachments: YARN-4781.001.patch, YARN-4781.002.patch, YARN-4781.003.patch, YARN-4781.004.patch,
YARN-4781.005.branch-2.patch, YARN-4781.005.patch
>
>
> We introduced fairness queue policy since YARN-3319, which will let large applications
make progresses and not starve small applications. However, if a large application takes the
queue’s resources, and containers of the large app has long lifespan, small applications
could still wait for resources for long time and SLAs cannot be guaranteed.
> Instead of wait for application release resources on their own, we need to preempt resources
of queue with fairness policy enabled.



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