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https://issues.apache.org/jira/browse/HADOOP-3887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619578#action_12619578
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Suman Sehgal commented on HADOOP-3887:
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Although the description is there in distcp.pdf but this information is not
being displayed by online help (on running "hadoop distcp -help" command).
> Distcp help needs to be more elaborated.
> ----------------------------------------
>
> Key: HADOOP-3887
> URL: https://issues.apache.org/jira/browse/HADOOP-3887
> Project: Hadoop Core
> Issue Type: Bug
> Components: documentation
> Affects Versions: 0.18.0
> Reporter: Suman Sehgal
> Priority: Minor
> Fix For: 0.18.0
>
>
> "hadoop distcp --help" command gives help regarding the execution of the
> distcp command but it doesn't give the details about copying data between
> different versions of Hadoop.
> The example displayed by the help documentation is :
> hadoop distcp -p -update "hdfs://A:8020/user/foo/bar"
> "hdfs://B:8020/user/foo/baz"
> while copying between different versions, distcp uses hftp protocol instead
> of hdfs for source path.
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