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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3598) Map-Reduce framework needlessly creates temporary _${taskid} directories for Maps
Date Fri, 20 Jun 2008 22:25:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606919#action_12606919
] 

Hadoop QA commented on HADOOP-3598:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12384404/HADOOP-3598_1_20080620.patch
  against trunk revision 669986.

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

    +1 tests included.  The patch appears to include 9 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/2711/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2711/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2711/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2711/console

This message is automatically generated.

> Map-Reduce framework needlessly creates temporary _${taskid} directories for Maps
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-3598
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3598
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3598_0_20080619.patch, HADOOP-3598_0_20080619.patch, HADOOP-3598_0_20080619.patch,
HADOOP-3598_1_20080620.patch
>
>
> The staging directory for task-outputs (i.e. ${mapred.out.dir}/_temporary/_${taskid})
should only be created when Maps produce output on HDFS, which usually isn't the case. This
plays very badly with HDFS quotas and may lead to thousands of temp names in the FS namespace,
there-by overhauling the quotas. IAC, it isn't good to needlessly create these directories.

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