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https://issues.apache.org/jira/browse/CASSANDRA-1015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860995#action_12860995
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Jeremy Hanna commented on CASSANDRA-1015:
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wasn't one thought for this to use avro for node-to-node communication (from 
the cassandra hackathon)?

> Internal Messaging should be backwards compatible
> -------------------------------------------------
>
>                 Key: CASSANDRA-1015
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1015
>             Project: Cassandra
>          Issue Type: Wish
>          Components: Core
>            Reporter: Ryan King
>            Priority: Critical
>
> Currently, incompatible changes in the node-to-node communication prevent 
> rolling restarts of clusters.
> In order to fix this we should:
> 1) use a framework that makes doing compatible changes easy
> 2) have a policy of only making compatible changes between versions n and n+1*
> * Running multiple versions should only be supported for small periods of 
> time. Running clusters of mixed version is not needed here.

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