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