[jira] Commented: (HADOOP-3446) The reduce task should not flush the in memory file system before starting the reducer

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627627#action_12627627 ] 

Hadoop QA commented on HADOOP-3446:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12389329/3446-4.patch
  against trunk revision 691099.

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

    +1 tests included.  The patch appears to include 6 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 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/3158/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3158/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3158/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3158/console

This message is automatically generated.

> The reduce task should not flush the in memory file system before starting the reducer
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3446
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3446
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Chris Douglas
>            Priority: Critical
>             Fix For: 0.19.0
>
>         Attachments: 3446-0.patch, 3446-1.patch, 3446-2.patch, 3446-3.patch, 3446-4.patch
>
>
> In the case where the entire reduce inputs fit in ram, we currently force the input to disk and re-read it before giving it to the reducer. It would be much better if we merged from the ramfs and any spills to feed the reducer its input.

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