Wei Yan commented on YARN-2073:

[~kasha], if we move preemption-related test code to a separate .java file, we 
may also need to move the previous preemption-related test functions 
(testChoiceOfPreemptedContainers and testPreemptionDecision) to the new file. 

And so next step we'll divide the TestFairScheduler into several test files 
according to different scheduler operations?

> 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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