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https://issues.apache.org/jira/browse/MAPREDUCE-654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756445#action_12756445
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Tom White commented on MAPREDUCE-654:
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How about calling the new option {{-dryrun}}, to make it clearer that it
doesn't do a copy?
> 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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