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https://issues.apache.org/jira/browse/HADOOP-2760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566866#action_12566866
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Milind Bhandarkar commented on HADOOP-2760:
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Since 0.15 does not have permissions anyway, it makes sense that the only data
you can copy from 0.16 to 0.15 via hftp must be world-readable in 0.16.
So, +1 to Mukund's analysis. This does not need to be fixed in 0.15.
> Distcp must be able to copy from .16 to .15
> -------------------------------------------
>
> 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
> Fix For: 0.15.4
>
>
> 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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