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Date: Fri, 28 Apr 2017 18:16:04 +0000 (UTC)
From: "Sunil G (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13067764.1493403301000.81239.1493403364378@Atlassian.JIRA>
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Subject: [jira] [Commented] (YARN-6538) Inter Queue preemption is not
 happening when DRF is configured
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archived-at: Fri, 28 Apr 2017 18:16:09 -0000


    [ https://issues.apache.org/jira/browse/YARN-6538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989261#comment-15989261 ] 

Sunil G commented on YARN-6538:
-------------------------------

cc/ [~leftnoteasy]

> Inter Queue preemption is not happening when DRF is configured
> --------------------------------------------------------------
>
>                 Key: YARN-6538
>                 URL: https://issues.apache.org/jira/browse/YARN-6538
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler preemption
>    Affects Versions: 2.8.0
>            Reporter: Sunil G
>            Assignee: Sunil G
>
> Cluster capacity of <memory:3TB, vCores:168>. Here memory is more and vcores are less. If applications have more demand, vcores might be exhausted. 
> Inter queue preemption ideally has to be kicked in once vcores is over utilized. However preemption is not happening.
> Analysis:
> In {{AbstractPreemptableResourceCalculator.computeFixpointAllocation}}, 
> {code}
>     // assign all cluster resources until no more demand, or no resources are
>     // left
>     while (!orderedByNeed.isEmpty() && Resources.greaterThan(rc, totGuarant,
>         unassigned, Resources.none())) {
> {code}
>  will loop even when vcores are 0. Hence we are having more vcores in idealAssigned which cause no-preemption cases.


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