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https://issues.apache.org/jira/browse/CASSANDRA-1015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976176#action_12976176
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T Jake Luciani commented on CASSANDRA-1015:
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Johnathan, this is one approach I've had success with using thrift
http://tjake.posterous.com/working-with-thrift-structures
So based on the type field you serialize to one of the column types.
> 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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