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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1297) Miscellaneous Fair Scheduler speedups
Date Wed, 01 Jan 2014 01:45:50 GMT

    [ https://issues.apache.org/jira/browse/YARN-1297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13859819#comment-13859819
] 

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/12621001/YARN-1297.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/2766//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/2766//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.patch, YARN-1297.patch
>
>
> I ran the Fair Scheduler's core scheduling loop through a profiler to 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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