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https://issues.apache.org/jira/browse/ACCUMULO-4416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431469#comment-15431469
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Josh Elser commented on ACCUMULO-4416:
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bq. Isn't the Kerberos convention for the realm to use an all upper-case
version of the domain?
For the realm, yes, but the hostname is placed in the instance (of the form
{{primary/instance@REALM}})
> MAC failures when running on host configured with mixed-case hostname
> ---------------------------------------------------------------------
>
> Key: ACCUMULO-4416
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4416
> Project: Accumulo
> Issue Type: Bug
> Components: test
> Affects Versions: 1.7.1
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Minor
>
> HADOOP-7988
> Kerberos is case-sensitive. DNS is not. I saw a case where a host with
> mixed-case hostname had a MAC instance that fell over because of a spam of
> failed RPCs that never succeeded.
> MiniKDC and our code seems to be doing the right thing, but somehow a
> lower-case on the hostname we were using on the client to communicate with
> the tserver happened. I'm not sure what component did this. Should look into
> this with some VM configured with a mixed-case hostname.
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