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b06a0078fb
There is a need for sending tablet info to the drivers so they can be tablet aware. For the best performance we want to get this info lazily only when it is needed. The info is send when driver asks about the information that the specific tablet contains and it is directed to the wrong node/shard so it could use that information for every subsequent query. If we send the query to the wrong node/shard, we want to send the RESULT message with additional information about the tablet (replicas and token range) in custom_payload. Mechanism for sending custom_payload added. Sending custom_payload tested using three node cluster and cqlsh queries. I used RF=1 so choosing wrong node was testable. I also manually tested it with the python-driver and confirmed that the tablet info can be deserialized properly. Automatic tests added. Closes scylladb/scylladb#15410 * github.com:scylladb/scylladb: docs: add documentation about sending tablet info to protocol extensions Add tests for sending tablet info cql3: send tablet if wrong node/shard is used during modification statement cql3: send tablet if wrong node/shard is used during select statement locator: add function to check locality locator: add function to check if host is local transport: add function to add tablet info to the result_message transport: add support for setting custom payload