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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10016) Distcp should support copy from a secure Hadoop 1 cluster to an insecure Hadoop 2 cluster
Date Fri, 04 Oct 2013 01:11:42 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13785783#comment-13785783
] 

Haohui Mai commented on HADOOP-10016:
-------------------------------------

We've tested two approaches and they both work.

(1) Fix the WebHDFS client and map-reduce so that they continue even they fail to get a delegation
token.
(2) In the insecure cluster, issue an artificial delegation token.

There is no security hole in the approach (2), since the token will be ignored by the insecure
cluster completely.

> Distcp should support copy from a secure Hadoop 1 cluster to an insecure Hadoop 2 cluster
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10016
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10016
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>
> Distcp should be able to copy from a secure cluster to an insecure cluster. This functionality
is important for operators to migrate data to a new Hadoop installation.



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