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  1. Rolling upgrade implemented. Guide -
    1. https://www.datastax.com/learn/whats-new-for-cassandra-4/migrating-cassandra-4x
    2. https://docs.datastax.com/en/luna-cassandra/guides/upgrade/overview.html
  2. Server-client compatibility works similar to Ignite Thin Client protocol.
  3. Compatibility checked with the special test framework - https://github.com/apache/cassandra-dtest/blob/trunk/upgrade_tests/README.md
    At a first glance, there are no special source code checks to ensure compatibility in day by day coding.
  4. ??? 

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