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