gRPC client auto reconnect

[Hemendra Rawat]

Hi All,

I'm new to using gRPC framework!

What will happen if the gRPC server process terminates and is restarted after few seconds for e.g. 20 seconds delay ? Will the client side channel auto reconnect or do I need to add specific logic on client side to handle reconnects on server restart?

[Yuri Golobokov]

Hi Hemendra,

A gRPC channel will reconnect automatically.

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[Hemendra Rawat]

Thanks for answering the question. What happens to the inflight client calls when the server terminates and then restarts? Does the client gets an error "UNAVAILABLE" and they have to add logic to retry the failed call, or gRPC call will just block and returns when server becomes alive?

Regards,

Hemendra 

[Сергей Соболев]

A grpc ClientContext has set_wait_for_ready method.  https://grpc.github.io/grpc/cpp/classgrpc_1_1_client_context.html#aa342af7349c88727e8bd4c765a000ae5

вторник, 9 ноября 2021 г. в 01:41:34 UTC+3, hkr...@gmail.com:

[Yuri Golobokov]

I'd say it depends on the client implementation, but AFAIK most clients will return UNAVAILABLE if the connection is dropped after the request is sent to the server.