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https://issues.apache.org/jira/browse/CASSANDRA-1015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933571#action_12933571
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Jonathan Ellis commented on CASSANDRA-1015:
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If we're going to move to a generic serialization format (last time I proposed 
that I was shot down by Avinash from a "ain't broke" perspective... memories!) 
then we should use the fastest one we're incorporating (msgpack?), not the 
slowest (avro).

> Internal Messaging should be backwards compatible
> -------------------------------------------------
>
>                 Key: CASSANDRA-1015
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1015
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Ryan King
>            Assignee: Gary Dusbabek
>            Priority: Critical
>             Fix For: 0.8
>
>
> 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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