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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3350) distcp should permit users to limit the number of maps
Date Tue, 06 May 2008 06:34:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594486#action_12594486
] 

Hadoop QA commented on HADOOP-3350:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12381473/3350-0.patch
  against trunk revision 653638.

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +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/2405/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2405/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2405/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2405/console

This message is automatically generated.

> distcp should permit users to limit the number of maps
> ------------------------------------------------------
>
>                 Key: HADOOP-3350
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3350
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Chris Douglas
>             Fix For: 0.18.0
>
>         Attachments: 3350-0.patch
>
>
> distcp provides no user-configurable setting to affect the number of maps run during
a copy. For large clusters, the current calculation- min(#bytes / 256MB, #nodes * 20)- can
be overly aggressive.

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