[jira] [Commented] (YARN-8379) Add an option to allow Capacity Scheduler preemption to balance satisfied queues

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

    [ https://issues.apache.org/jira/browse/YARN-8379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495817#comment-16495817 ] 

Wangda Tan commented on YARN-8379:
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To make better resource balances between queues, we propose to make the additional preemption between queues configurable. And admin can set a different kill-before-wait timeout to control the pace of the additional queue balance preemption.

cc: [~jlowe], [~eepayne], [~sunilg] for suggestions.

Thanks [~clayb]/[~Zian Chen] for offline suggestions and feedbacks.

> Add an option to allow Capacity Scheduler preemption to balance satisfied queues
> --------------------------------------------------------------------------------
>
>                 Key: YARN-8379
>                 URL: https://issues.apache.org/jira/browse/YARN-8379
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>            Priority: Major
>
> Existing capacity scheduler only supports preemption for an underutilized queue to reach its guaranteed resource. In addition to that, there’s an requirement to get better balance between queues when all of them reach guaranteed resource but with different fairness resource.
> An example is, 3 queues with capacity, queue_a = 30%, queue_b = 30%, queue_c = 40%. At time T. queue_a is using 30%, queue_b is using 70%. Existing scheduler preemption won't happen. But this is unfair to queue_b since queue_b has the same guaranteed resources.
> Before YARN-5864, capacity scheduler do additional preemption to balance queues. We changed the logic since it could preempt too many containers between queues when all queues are satisfied.



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