Implementing ACK Mechanism for Reliable Message Delivery in gRPC Streams

[iokk3732]

When I use gRPC streams, calling onNext() is an asynchronous operation. In cases of poor network conditions, packet loss may occur. Is there any way to implement an acknowledgment mechanism similar to TCP/IP's ACK?

[kannanjgithub]

gRPC guarantees message ordering, so if the sender sends messages A, B and C in a stream, there can never be a case where only A and C are received but B is lost. If C is received, it implies both A and B were received as well. gRPC also buffers and retires messages in a stream.
Any ack mechanism that is needed should be implemented in the application code.