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Date: Thu, 16 Feb 2017 18:45:41 +0000 (UTC)
From: "Yufei Gu (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13042235.1486773719000.102185.1487270741897@Atlassian.JIRA>
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Subject: [jira] [Commented] (YARN-6175) Negative vcore for resource needed
 to preempt
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archived-at: Thu, 16 Feb 2017 18:45:47 -0000


    [ https://issues.apache.org/jira/browse/YARN-6175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870487#comment-15870487 ] 

Yufei Gu commented on YARN-6175:
--------------------------------

[~kasha], would you like take a look since YARN-6163 is done. 

> Negative vcore for resource needed to preempt
> ---------------------------------------------
>
>                 Key: YARN-6175
>                 URL: https://issues.apache.org/jira/browse/YARN-6175
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.8.0
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>         Attachments: YARN-6175.001.patch
>
>
> Both old preemption code (2.8 and before) and new preemption code could have negative vcores while calculating resources needed to preempt.
> For old preemption, you can find following messages in RM logs:
> {code}
> Should preempt <memory:2048, vCores:-2> 
> {code}
> The related code is in method {{resourceDeficit()}}. 
> For new preemption code, there are no messages in RM logs, the related code is in method {{fairShareStarvation()}}. 
> The negative value isn't only a display issue, but also may cause missing necessary preemption. 


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