[jira] Commented: (MAPREDUCE-654) Add an option -count to distcp for displaying some info about the src files

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752694#action_12752694 ] 

Hadoop QA commented on MAPREDUCE-654:
-------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12418918/d_count654.patch
  against trunk revision 812546.

    +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-h3.grid.sp2.yahoo.net/16/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/16/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/16/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/16/console

This message is automatically generated.

> Add an option -count to distcp for displaying some info about the src files
> ---------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-654
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-654
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: distcp
>    Affects Versions: 0.21.0
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>             Fix For: 0.21.0
>
>         Attachments: d_count.patch, d_count654.patch, d_count_v1.patch
>
>
> Add an option -count to distcp for displaying metadata about src files like number of files to be copied and total size of src files to be copied.
> WIth -count, distcp doesn't do any copy. Just displays info and exits.
> This is useful specifically when used with -update.
>  distcp -update -count <src>* <dst> 
>       would display the number of files to be updated and the total size of copy needs to be done(by comparing the file sizes and checksums at src and dst). Based on this info, users could allocate the number of nodes needed for the actual update job.

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