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https://issues.apache.org/jira/browse/HADOOP-7988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194922#comment-13194922
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Allen Wittenauer commented on HADOOP-7988:
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Ask me if I care what HBase does.
However, I did have a chat with a friend of mine who reminded me that RFC 4150
(which I completely forgot about) actually does clarify the previous, murky
rules around server principals by saying that the host component for case
insensitive systems should be forced lower case. Note that this is for
*server* principals. We are back in slightly murky waters again when you
consider KSSL and SPNEGO....
But even so, I'll remove my -1.
> Upper case in hostname part of the principals doesn't work with kerberos.
> -------------------------------------------------------------------------
>
> Key: HADOOP-7988
> URL: https://issues.apache.org/jira/browse/HADOOP-7988
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.24.0, 0.23.1, 1.0.0
> Reporter: Jitendra Nath Pandey
> Assignee: Jitendra Nath Pandey
> Attachments: HADOOP-7988.branch-1.patch
>
>
> Kerberos doesn't like upper case in the hostname part of the principals.
> This issue has been seen in 23 as well as 1.0.
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