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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1297) Miscellaneous Fair Scheduler speedups
Date Tue, 19 Aug 2014 17:11:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-1297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14102477#comment-14102477
] 

Hadoop QA commented on YARN-1297:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12628664/YARN-1297-2.patch
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4670//console

This message is automatically generated.

> Miscellaneous Fair Scheduler speedups
> -------------------------------------
>
>                 Key: YARN-1297
>                 URL: https://issues.apache.org/jira/browse/YARN-1297
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: scheduler
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-1297-1.patch, YARN-1297-2.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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