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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1231) Distcp is very slow
Date Fri, 27 Nov 2009 07:06:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783046#action_12783046
] 

Hadoop QA commented on MAPREDUCE-1231:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12426190/mapred-1231-v3.patch
  against trunk revision 884628.

    +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 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 failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/272/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/272/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/272/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/272/console

This message is automatically generated.

> Distcp is very slow
> -------------------
>
>                 Key: MAPREDUCE-1231
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1231
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: distcp
>    Affects Versions: 0.20.1
>            Reporter: Jothi Padmanabhan
>            Assignee: Jothi Padmanabhan
>         Attachments: mapred-1231-v1.patch, mapred-1231-v2.patch, mapred-1231-v3.patch,
mapred-1231-v3.patch, mapred-1231-y20-v2.patch, mapred-1231-y20-v3.patch, mapred-1231-y20-v4.patch,
mapred-1231-y20.patch, mapred-1231.patch
>
>
> Currently distcp does a checksums check in addition to file length check to decide if
a remote file has to be copied. If the number of files is high (thousands), this checksum
check is proving to be fairly costly leading to a long time before the copy is started.

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