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Comment: Added architecture diagrams

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Additionally, the SBR benefits from the fact that the Cassandra codebase can always read SSTables in the previous major version format. If Cassandra supported both reading from and writing to the previous major SSTable format, we would be able to remove the dependency on embedding multiple versions of the cassandra-all  jar into the solution in order to support mixed-mode clusters, as you would see during major version upgrades.

Architecture Diagrams/Overview of Data Flow

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