Joel Knighton commented on CASSANDRA-12485:

[~cmlicata] from that error, it looks like the Cassandra directory being used 
by dtests (specified by CASSANDRA_DIR) hasn't built a working copy of stress. 
Have you done a complete build in that directory?

> 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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