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https://issues.apache.org/jira/browse/MAPREDUCE-2420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016076#comment-13016076
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Boris Shkolnik commented on MAPREDUCE-2420:
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committed to branch-20-security.
> JobTracker should be able to renew delegation token over HTTP
> -------------------------------------------------------------
>
> Key: MAPREDUCE-2420
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2420
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.4
> Reporter: Boris Shkolnik
> Assignee: Boris Shkolnik
> Attachments: MR-2420-1.patch, MR-2420.patch
>
>
> in case JobTracker has to talk to a NameNode running a different version (RPC
> version mismatch), Jobtracker should be able to fall back to HTTP renewal.
> Example of the case - running distcp between different versions using hfpt.
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