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Date: Fri, 20 Mar 2009 08:28:50 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4788) Set
 mapred.fairscheduler.assignmultiple to true by default
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    [ https://issues.apache.org/jira/browse/HADOOP-4788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683908#action_12683908 ] 

Hadoop QA commented on HADOOP-4788:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12402612/hadoop-4788-v0.patch
  against trunk revision 756352.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/113/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/113/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/113/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/113/console

This message is automatically generated.

> Set mapred.fairscheduler.assignmultiple to true by default
> ----------------------------------------------------------
>
>                 Key: HADOOP-4788
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4788
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/fair-share
>            Reporter: Matei Zaharia
>            Assignee: Matei Zaharia
>            Priority: Trivial
>         Attachments: hadoop-4788-v0.patch
>
>
> Pretty much all users of the fair scheduler are using the "assignmultiple" feature which lets it launch reduce tasks at the same time as map tasks (on the same heartbeats), leading to reduces starting faster. This is also going to happen in Hadoop by default in HADOOP-3136. So we should set it to true by default and perhaps even remove the config parameter.

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