Yifan Cai created CASSANDRA-15936:
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             Summary: Extend IInternodeAuthenticator to inspect existing 
connections
                 Key: CASSANDRA-15936
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15936
             Project: Cassandra
          Issue Type: Improvement
          Components: Messaging/Internode
            Reporter: Yifan Cai
            Assignee: Yifan Cai


The internode authenticator ({{IInternodeAuthenticator}}) should support 
inspecting the existing connections and close the connections if no longer 
permitted. 

It would be useful and necessary for the dynamic internode authenticator 
implementations, which may stop authenticating connections between some nodes 
at a later time point. 

The current interface only authenticates on a connection during tcp/nodes 
handshake. It leaves the existing connection alive and the nodes are still able 
to communicate, after the authenticator has been updated to not permit 
connections between the nodes. 



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