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https://issues.apache.org/jira/browse/CASSANDRA-16385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17272614#comment-17272614
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Yifan Cai commented on CASSANDRA-16385:
---------------------------------------

Thanks for the patch. I left the feedback in the PR. 

I think it is hard to fix the payload serializer without patching 
"Message.java", since the api "Message.Serializer#serialize" serialize both 
message header and payload. We could probably add a testing-only overloading 
method that accepts serializer. So it can determine the serializer to use in 
the in-jvm dtest framework. 

+1 on "make message re-serialization itself lazy" and agree that it is separate 
issue. 

> Correctly serialize all request responses - CASSANDRA-15946 followup
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-16385
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16385
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Test/dtest/java
>            Reporter: Jon Meredith
>            Assignee: Jon Meredith
>            Priority: Normal
>             Fix For: 4.0-beta
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> When receiving a message, a 4.0 dtest instance reserializes  messages to pass 
> them through the dtest message filtering.
>  
>  The 4.0 internode messaging refactor does not expect to have to re-serialize 
> response
>  messages, so the workaround in CASSANDRA-15946 was just to register the 
> ReadResponse serializer for all REQUEST_RESPONSE messages, however request 
> response is used for other responses too.
> I'm attaching a patch that demonstrates the issue by adding a simple Paxos 
> upgrade test to generate a PrepareResponse message that crashes the 
> ReadResponse serializer, then reverts CASSANDRA-15946 and re-users the 
> messaging service serialization method that checks the request callback if a 
> serializer is not defined.



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