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https://issues.apache.org/jira/browse/CASSANDRA-17478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17514750#comment-17514750
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Ekaterina Dimitrova commented on CASSANDRA-17478:
-------------------------------------------------

Oh nice! Thank you [~brandon.williams], I just linked it also in Butler. 

> Disallow removal of a DC from system_auth replication settings
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-17478
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17478
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Feature/Authorization
>            Reporter: Josh McKenzie
>            Assignee: Josh McKenzie
>            Priority: Normal
>             Fix For: 4.1
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> It's never correct for an operator to remove a DC from system_auth 
> replication settings while there are currently nodes up in that DC. We should 
> disallow the ability to manually make this change, as if you need to 
> decommission a DC you need to remove all the nodes from the cluster before 
> allowing the replication settings change on system_auth.



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