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Date: Wed, 13 Jan 2016 17:49:40 +0000 (UTC)
From: "Sunil G (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
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Subject: [jira] [Commented] (YARN-2009) Priority support for preemption in
 ProportionalCapacityPreemptionPolicy
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    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15096667#comment-15096667 ] 

Sunil G commented on YARN-2009:
-------------------------------

Hi [~eepayne]
Thank you. I guess its more for user fairness based preemption so that if some resource is grabbed by a user, its to be reclaimed back. Priority is another policy to add in inqueue preemption. 
I think these policies can be pluggable, and with same framework user can apply these triggers to achieve use cases. I think along with YARN-4108, inqueue preemption framework can be added first. And separate triggers (priority, user-limit) can be added as pluggable entities. thoughts?

> 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
>
> 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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