Arun Suresh updated YARN-1297:
    Attachment: YARN-1297.3.patch

Updating patch.. fixing it up to so it rebases to trunk

> Miscellaneous Fair Scheduler speedups
> -------------------------------------
>                 Key: YARN-1297
>                 URL: https://issues.apache.org/jira/browse/YARN-1297
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>              Labels: BB2015-05-TBR
>         Attachments: YARN-1297-1.patch, YARN-1297-2.patch, YARN-1297.3.patch, 
> YARN-1297.patch, YARN-1297.patch
> I ran the Fair Scheduler's core scheduling loop through a profiler tool and 
> identified a bunch of minimally invasive changes that can shave off a few 
> milliseconds.
> The main one is demoting a couple INFO log messages to DEBUG, which brought 
> my benchmark down from 16000 ms to 6000.
> A few others (which had way less of an impact) were
> * Most of the time in comparisons was being spent in Math.signum.  I switched 
> this to direct ifs and elses and it halved the percent of time spent in 
> comparisons.
> * I removed some unnecessary instantiations of Resource objects
> * I made it so that queues' usage wasn't calculated from the applications up 
> each time getResourceUsage was called.

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