[jira] [Commented] (YARN-4781) Support intra-queue preemption for fairness ordering policy.

["Wangda Tan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231088#comment-15231088 ] 

Wangda Tan commented on YARN-4781:
----------------------------------

[~sunilg],

We should make sure this JIRA contains infrastructure that can be used by other intra-queue preemption policies such as priority-based.

[~milesc],

Thanks for sharing your use cases,  hopefully you don't need creating one queue for each job any more after this feature :) 

> 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: Wangda Tan
>
> 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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