Distcp must be able to copy from .16 to .15
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                 Key: HADOOP-2760
                 URL: https://issues.apache.org/jira/browse/HADOOP-2760
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
            Reporter: Robert Chansler
            Assignee: Tsz Wo (Nicholas), SZE


Typically the "from" source files are referenced via HTTP, a strategy to evade 
version incompatibilities. In .16, with permission checking, there is no 
presumption that any particular file can be read via the web server.

There must be some alternative for supplying user credentials so as to enable 
down-version copies.

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