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There already is a similar feature - Partition Awareness. When enabled, the client calls exactly the primary node to update cache by key.

To achieve Service Awareness we should:
1) Bring a new feature to the thin client protocol.
2) Require and activate with the Partition Awareness flag enabled. It raises proper cluster connections.
3) Obtain service topology with a dedicated request by the client and provide it to the service proxies.
4) Initiate the topology update with: first service invocation, cluster topology change, some timeout (only if service is invoked).

New protocol feature

Service topology request

One new client operation is required:

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