Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/724
@bbende This is a great start. I've verified that we can no longer add new
users or groups with the same name as existing users or groups. However, I
think we need to additionally ensure uniqueness between user identities and
group names. Also, the unique constraint appears to only be checked when
creating the user or group. Updating still allows the identities to become the
same.
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