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https://issues.apache.org/jira/browse/HADOOP-2760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566816#action_12566816
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Mukund Madhugiri commented on HADOOP-2760:
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Do we even need this? It works from 0.15 if data in 0.16 is world readable. If
somebody is pulling data from a "secure" cluster into an "unsecure" cluster,
the data is anyway going to be world readable. I tried the scenarios and here
is the data:
1. distcp initiated from 0.15.3 and 0.16.0 permissions turned OFF:
* Directory with permission 777, data copied from 0.16.0 to 0.15.3 - WORKS
* Directory with permission 770, data copied from 0.16.0 to 0.15.3 - WORKS
* Directory with permission 700, data copied from 0.16.0 to 0.15.3 - WORKS
* Directory with permission 000, data copied from 0.16.0 to 0.15.3 - WORKS
2. distcp initiated from 0.15.3 and 0.16.0 permissions turned ON:
* Directory with permission 777, data copied from 0.16.0 to 0.15.3 - WORKS
* Directory with permission 770, data copied from 0.16.0 to 0.15.3 - DOES NOT
WORK
* Directory with permission 700, data copied from 0.16.0 to 0.15.3 - DOES NOT
WORK
* Directory with permission 000, data copied from 0.16.0 to 0.15.3 - DOES NOT
WORK
3. distcp initiated from 0.16.0 and 0.16.0 permissions turned ON:
* data copied from 0.15.3 to 0.16.0 - WORKS
4. distcp initiated from 0.16.0 and 0.16.0 permissions turned OFF:
* data copied from 0.15.3 to 0.16.0 - WORKS
> 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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