Coherence provides the ability for clients in various languages to connect to a cluster using gRPC (https://grpc.io/) as the network transport.

For Java clients, connecting using gRPC provides an alternative to Coherence*Extend connections and can be advantageous when you need to connect through a load balancer as gRPC uses HTTP/2 under the covers and is more load balancer friendly.

If you want to connect to Coherence from JavaScript, Python, or Go clients, then gRPC is the only protocol supported.

For any of the language options, from a cluster perspective, you must include the coherence-grpc-proxy module, with which the server-side gRPC proxy will accept the gRPC connections and carry out work on behalf of the clients.

See Using the Coherence gRPC Proxy Server for setting up a gRPC Proxy server.