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From "Christopher Licata (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12485) Always require replace_address to replace existing token
Date Thu, 27 Oct 2016 18:59:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612809#comment-15612809
] 

Christopher Licata  commented on CASSANDRA-12485:
-------------------------------------------------

So, I haven't received any feedback on my (potential) patch.  Hey [~beobal], if you have a
second, would you be able to take a look, as you patched up [Cassandra-10134 |https://issues.apache.org/jira/browse/CASSANDRA-10134].

> Always require replace_address to replace existing token
> --------------------------------------------------------
>
>                 Key: CASSANDRA-12485
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12485
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Distributed Metadata
>            Reporter: Paulo Motta
>            Priority: Minor
>              Labels: lhf
>
> CASSANDRA-10134 prevented replace an existing node unless {{\-Dcassandra.replace_address}}
or {{\-Dcassandra.allow_unsafe_replace=true}} is specified.
> We should extend this behavior to tokens, preventing a node from joining the ring if
another node with the same token already existing in the ring, unless {{\-Dcassandra.replace_address}}
or {{\-Dcassandra.allow_unsafe_replace=true}} is specified in order to avoid catastrophic
scenarios.
> One scenario where this can easily happen is if you replace a node with another node
with a different IP, and after some time you restart the original node by mistake. The original
node will then take over the tokens of the replaced node (since it has a newer gossip generation).



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