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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-654) Add an option -count to distcp for displaying some info about the src files
Date Fri, 18 Sep 2009 18:25:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757317#action_12757317

Nigel Daley commented on MAPREDUCE-654:

Why no automated unit test for this?  CLI test could have been used, no?

> 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: Improvement
>          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, M654-2.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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