Craig Welch updated YARN-3319:
    Attachment: YARN-3319.72.patch

Fix a findbugs

> Implement a FairOrderingPolicy
> ------------------------------
>                 Key: YARN-3319
>                 URL: https://issues.apache.org/jira/browse/YARN-3319
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Craig Welch
>            Assignee: Craig Welch
>         Attachments: YARN-3319.13.patch, YARN-3319.14.patch, 
> YARN-3319.17.patch, YARN-3319.35.patch, YARN-3319.39.patch, 
> YARN-3319.45.patch, YARN-3319.47.patch, YARN-3319.53.patch, 
> YARN-3319.58.patch, YARN-3319.70.patch, YARN-3319.71.patch, YARN-3319.72.patch
> Implement a FairOrderingPolicy which prefers to allocate to 
> SchedulerProcesses with least current usage, very similar to the 
> FairScheduler's FairSharePolicy.  
> The Policy will offer allocations to applications in a queue in order of 
> least resources used, and preempt applications in reverse order (from most 
> resources used). This will include conditional support for sizeBasedWeight 
> style adjustment
> Optionally, based on a conditional configuration to enable sizeBasedWeight 
> (default false), an adjustment to boost larger applications (to offset the 
> natural preference for smaller applications) will adjust the resource usage 
> value based on demand, dividing it by the below value:
> Math.log1p(app memory demand) / Math.log(2);
> In cases where the above is indeterminate (two applications are equal after 
> this comparison), behavior falls back to comparison based on the application 
> id, which is generally lexically FIFO for that comparison

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