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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Mon, 17 Oct 2016 20:39:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583383#comment-15583383
] 

Wangda Tan commented on YARN-2009:
----------------------------------

Thanks for updating the patch, [~sunilg] and thanks thorough review suggestions from [~eepayne]!

For the AM resource usages while doing intra-queue preemption, as of now, we don't consider
preempt any AM. in another word, these resources are "frozen".

To simply the problem, instead of creating another pool for AM resource, I would prefer to
deduct them in all calculations.

There're a few of calculations we should look at:
- totalPreemptedResourceAllowed should deduct total AM usages from the queue. (ResourceUsage.getAMUsed
of queue may not correct since we inc am-used before allocating the container, it's better
to add all AM resource from running apps.)
- preemtableFromApp should deduct AM usages from each app

I think the solution should work, let me know if I missed anything.

> Priority support for preemption in ProportionalCapacityPreemptionPolicy
> -----------------------------------------------------------------------
>
>                 Key: YARN-2009
>                 URL: https://issues.apache.org/jira/browse/YARN-2009
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Devaraj K
>            Assignee: Sunil G
>         Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch, YARN-2009.0003.patch,
YARN-2009.0004.patch, YARN-2009.0005.patch, YARN-2009.0006.patch, YARN-2009.0007.patch, YARN-2009.0008.patch
>
>
> While preempting containers based on the queue ideal assignment, we may need to consider
preempting the low priority application containers first.



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