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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1231) Distcp is very slow
Date Mon, 23 Nov 2009 20:13:40 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781595#action_12781595
] 

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

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12425817/mapred-1231.patch
  against trunk revision 882790.

    +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 new tests are needed for this patch.
                        Also please list what manual steps were performed to verify 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/Mapreduce-Patch-h6.grid.sp2.yahoo.net/260/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/260/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/260/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/260/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: Bug
>          Components: distcp
>    Affects Versions: 0.20.1
>            Reporter: Jothi Padmanabhan
>            Assignee: Jothi Padmanabhan
>             Fix For: 0.20.2
>
>         Attachments: 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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