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Date: Mon, 25 Jul 2016 16:12:20 +0000 (UTC)
From: "Eric Payne (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12957920.1460419286000.124672.1469463140587@Atlassian.JIRA>
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References: <JIRA.12957920.1460419286000@Atlassian.JIRA> <JIRA.12957920.1460419286720@arcas>
Subject: [jira] [Commented] (YARN-4945) [Umbrella] Capacity Scheduler
 Preemption Within a queue
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archived-at: Mon, 25 Jul 2016 16:12:22 -0000


    [ 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.

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

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 like:
> YARN-2009. YARN-2113. YARN-4781.


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