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https://issues.apache.org/jira/browse/NIFI-2403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394482#comment-15394482
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ASF GitHub Bot commented on NIFI-2403:
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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.


> Users and Groups with same name/identity cause problems in FileAuthorizer
> -------------------------------------------------------------------------
>
>                 Key: NIFI-2403
>                 URL: https://issues.apache.org/jira/browse/NIFI-2403
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Bryan Bende
>            Assignee: Bryan Bende
>             Fix For: 1.0.0
>
>
> Currently the FileAuthorizer does not check for uniqueness of user identities 
> or group names, and this leads to non-deterministic behavior.



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