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https://issues.apache.org/jira/browse/HADOOP-14570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16481748#comment-16481748
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Wei-Chiu Chuang commented on HADOOP-14570:
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Looks like this is a dup of HADOOP-10323, where there's already a patch
available.
So I'll close this one and let's move over the discussion there.
> Distcp --dry-run switch to show what files would copy like rsync
> ----------------------------------------------------------------
>
> Key: HADOOP-14570
> URL: https://issues.apache.org/jira/browse/HADOOP-14570
> Project: Hadoop Common
> Issue Type: New Feature
> Components: tools/distcp
> Affects Versions: 2.7.3
> Environment: HDP 2.5.0, HDP 2.6.0 with Kerberos
> Reporter: Hari Sekhon
> Priority: Major
>
> Feature Request to add -n / --dry-run switches to print what files would be
> copied from which source to which destination paths without actually
> launching the maps to do the copying.
> This is useful for testing exclusion -filters and also to see the destination
> paths as the -update/-overwrite behaviour of not copying the top level source
> folder can trip up even those of us who know the behaviour difference so it's
> nice to be able to print as a first step without doing the operation. This is
> what linux admins have been doing forever with rsync.
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