Arrow Flight RPC (and Arrow Flight SQL, a faster alternative to ODBC/JDBC) are based on gRPC and protobufs: https://arrow.apache.org/docs/format/Flight.html:

> Arrow Flight is an RPC framework for high-performance data services based on Arrow data, and is built on top of gRPC and the IPC format.

> Flight is organized around streams of Arrow record batches, being either downloaded from or uploaded to another service. A set of metadata methods offers discovery and introspection of streams, as well as the ability to implement application-specific methods.

> Methods and message wire formats are defined by Protobuf, enabling interoperability with clients that may support gRPC and Arrow separately, but not Flight. However, Flight implementations include further optimizations to avoid overhead in usage of Protobuf (mostly around avoiding excessive memory copies

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