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https://issues.apache.org/jira/browse/HADOOP-14570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16067844#comment-16067844
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Hongyuan Li commented on HADOOP-14570:
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Sorry to interrupt you, can you list your request more obviously? how about 
making it as a list?

> 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
>
> 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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