[jira] [Created] (CASSANDRA-14540) Internode messaging handshake sends wrong messaging version number

["Jason Brown (JIRA)" <ji...@apache.org>]

Jason Brown created CASSANDRA-14540:
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             Summary: Internode messaging handshake sends wrong messaging version number
                 Key: CASSANDRA-14540
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14540
             Project: Cassandra
          Issue Type: Bug
          Components: Streaming and Messaging
            Reporter: Jason Brown
            Assignee: Jason Brown
             Fix For: 4.x


With the refactor of internode messaging to netty in 4.0, we abstracted the protocol handshakes messages into a class and handlers. There is a bug when the initiator of the connection sends, in the third message of the handshake, it's own default protocol version number ({{MessagingService.current_version}}), rather than the negotiated version. This was not causing any obvious problems when CASSANDRA-8457 was initially committed, but the bug is exposed after CASSANDRA-7544. The problem is during rolling upgrades of 3.0/3.X to 4.0, nodes cannot correctly connect. 



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