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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3819) Exception while renewing delegation token
Date Mon, 06 Feb 2012 21:50:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201638#comment-13201638
] 

Daryn Sharp commented on MAPREDUCE-3819:
----------------------------------------

No, Mahadev is right, this is not harmless.  The interesting part of the log is:

{{Couldn't setup connection for <RM principal>/<RMhostname>@<REALM>  to
*null*}}

There was a similar issue with the JHS where the "to null" error occurred when the service
protocol wasn't correctly defined.
                
> Exception while renewing delegation token
> -----------------------------------------
>
>                 Key: MAPREDUCE-3819
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3819
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Ramya Sunil
>            Priority: Critical
>


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