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by chris-hexx 4033 days ago
grpc is Google's flavor of RPC, with transport and semantics specified for you.

0MQ is an abstraction over raw sockets that lets you worry less about how different parts of a distributed application find and talk to each other.

There's no real direct comparison; you can implement request/reply patterns, like RPC, using 0MQ for the networking parts, but that's not all it's limited to.