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https://issues.apache.org/jira/browse/HADOOP-2760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564839#action_12564839
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Doug Cutting commented on HADOOP-2760:
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Shouldn't this be a 0.16 bug? We shouldn't force folks to upgrade their 0.15
clusters before they can access data from a 0.16 cluster, but rather just fix
0.16 to interoperate with 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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