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https://issues.apache.org/jira/browse/YARN-2073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004181#comment-14004181
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Karthik Kambatla commented on YARN-2073:
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bq. we may also need to move the previous preemption-related test functions 
(testChoiceOfPreemptedContainers and testPreemptionDecision) to the new file
Moving them might require slightly more work, and I was planning on doing that 
in a separate JIRA along with splitting the tests into multiple files. 

> FairScheduler starts preempting resources even with free resources on the 
> cluster
> ---------------------------------------------------------------------------------
>
>                 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
>         Attachments: yarn-2073-0.patch, yarn-2073-1.patch
>
>
> Preemption should kick in only when the currently available slots don't match 
> the request. 



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