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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4945) [Umbrella] Capacity Scheduler Preemption Within a queue
Date Mon, 25 Jul 2016 16:12:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392184#comment-15392184

Eric Payne commented on YARN-4945:

Thanks [~sunilg]. I appreciate very much any design help and POC help that you can provide.

queue preemption may need to consider multiple factors such
- Priority
- Fairness
- User limit

In general, I would like to separate out the sub-feature pieces of in-queue preemption as
much as possible. I am a fan of making small, simple improvements in increments. I believe
this makes it easier to understand, test, and review.

bq. For initial POC, I was planning priority as I have done an independent POC for priority
preemption alone.
One thing I don't understand is the use case for a priority policy that is separate from a
user limit policy. For my users' use case, the most important of these is user limit. However,
I think that in-queue preemption based on user limit needs to be very dependent on app priority
and vice-versa. Can you please elaborate?

> [Umbrella] Capacity Scheduler Preemption Within a queue
> -------------------------------------------------------
>                 Key: YARN-4945
>                 URL: https://issues.apache.org/jira/browse/YARN-4945
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
> This is umbrella ticket to track efforts of preemption within a queue to support features
> YARN-2009. YARN-2113. YARN-4781.

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