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https://issues.apache.org/jira/browse/CASSANDRA-10243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15014921#comment-15014921
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Paulo Motta commented on CASSANDRA-10243:
-----------------------------------------

Nice work! Some preliminary comments in case you want to address before the 
timezone flip: 


> Warn or fail when changing cluster topology live
> ------------------------------------------------
>
>                 Key: CASSANDRA-10243
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10243
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Stefania
>            Priority: Critical
>             Fix For: 2.1.x
>
>
> Moving a node from one rack to another in the snitch, while it is alive, is 
> almost always the wrong thing to do.



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