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https://issues.apache.org/jira/browse/MAPREDUCE-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021230#comment-13021230
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Hadoop QA commented on MAPREDUCE-2257:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12476634/MAPREDUCE-2257.patch
  against trunk revision 1094093.

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

    +1 tests included.  The patch appears to include 4 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    -1 javac.  The applied patch generated 2256 javac compiler warnings (more 
than the trunk's current 2244 warnings).

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) 
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.

    +1 system test framework.  The patch passed system test framework compile.

Test results: 
https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/173//testReport/
Findbugs warnings: 
https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/173//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/173//console

This message is automatically generated.

> distcp can copy blocks in parallel
> ----------------------------------
>
>                 Key: MAPREDUCE-2257
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2257
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: distcp
>    Affects Versions: 0.21.0
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: MAPREDUCE-2257.patch
>
>
> The minimum unit of work for a distcp task is a file. We have files that are 
> greater than 1 TB with a block size of  1 GB. If we use distcp to copy these 
> files, the tasks either take a long long long time or finally fails. A better 
> way for distcp would be to copy all the source blocks in parallel, and then 
> stich the blocks back to files at the destination via the HDFS Concat API 
> (HDFS-222)

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