Question about dependency on protobuf

[Amber Hu]

Hi Experts,

I have a question about the requirement on protobuf from grpc.

I found the required protobuf version's bumped from 3.5.0 to 4.21.3 directly since v1.49.0, my question is what new feature from protobuf is requested for this upgrading?

Thanks for your time in advance.

BR/Amber

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[veb...@google.com]

Usually gRPC tries to bump the version of Protobuf every time Protobuf has a new release to make two libraries work together. But gRPC can work with older versions of Protobuf in general. You can try using older protobuf with the latest gRPC. Sometimes you might see build errors because of breaking changes Protobuf sometimes introduced. Note that protobuf introduced two major things recently; new Abseil dependency and Cord support. Those may prevent you from pairing new gRPC and old Protobuf but you can try it.

[Amber Hu]

Huge thanks for your answer.

BR/Amber

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