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https://issues.apache.org/jira/browse/YARN-2073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028256#comment-14028256
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Wei Yan commented on YARN-2073:
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should be a mistake here. need to use allocated resource.

> Fair Scheduler: Add a utilization threshold to prevent preempting resources 
> when cluster is free
> ------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2073
>                 URL: https://issues.apache.org/jira/browse/YARN-2073
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 2.4.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Critical
>             Fix For: 2.5.0
>
>         Attachments: yarn-2073-0.patch, yarn-2073-1.patch, yarn-2073-2.patch, 
> yarn-2073-3.patch, yarn-2073-4.patch
>
>
> Preemption should kick in only when the currently available slots don't match 
> the request. 



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