[jira] [Created] (CASSANDRA-15946) Communication problem between C* 3 and C* 4 in in-jvm dtests

["Jacek Lewandowski (Jira)" <ji...@apache.org>]

Jacek Lewandowski created CASSANDRA-15946:
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             Summary: Communication problem between C* 3 and C* 4 in in-jvm dtests
                 Key: CASSANDRA-15946
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15946
             Project: Cassandra
          Issue Type: Bug
          Components: Test/dtest
            Reporter: Jacek Lewandowski
            Assignee: Jacek Lewandowski


There is a communication problem when testing upgrades using in-JVM dtest between Cassandra 3 and 4. 

In a method {{registerInboundFilter}} of {{Instance}}, we get a message which was just received and we prepare it for filtering as part of which, we serialize the payload again. This is fine when dealing with incoming Cassandra 4 message, because we can serialize it. However when we get the Cassandra 3 message, which uses a different protocol, and we get something like {{REQUEST_RSP}}, we can surely deserialize it through some special deserialization path, but we cannot serialize the payload for it as there is no serializer defined for {{REQUEST_RSP}} - no wonder, why would Cassandra 4.0 need to be able to serialize Cassandra 3.0 payloads?




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