[jira] [Created] (CASSANDRA-12485) Always require replace_address to replace existing token

["Paulo Motta (JIRA)" <ji...@apache.org>]

Paulo Motta created CASSANDRA-12485:
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             Summary: 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


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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