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https://issues.apache.org/jira/browse/CASSANDRA-872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843667#action_12843667
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Jonathan Ellis commented on CASSANDRA-872:
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I'd be down with logging WARN when the ip associated w/ a token changes
> Nodes should fail to join the ring with duped tokens
> ----------------------------------------------------
>
> Key: CASSANDRA-872
> URL: https://issues.apache.org/jira/browse/CASSANDRA-872
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.6
> Reporter: Stu Hood
> Fix For: 0.6
>
>
> Currently, multiple nodes can join the ring with the same token (particularly
> when people copy the data directory between machines). The symptom is that
> the new endpoint joins the ring successfully, but both nodes can only see
> themselves in the ring (according to nodetool).
> Instead of this behaviour, we would want gossip to die rather than joining
> with a duped token.
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