GRPC connection socket policy

[Александр Сергеев]

Good afternoon!

Quickly looking through the documentation, I wasn't able to find an answer to a question that interested me, so maybe you could help me here.

I was wondering, how many socket connections are being used when GRPC client communicates to GRPC server? Does one GRPC "channel" operate inside of one TCP socket or does it reconnect every time user calls another procedure?

I think that understanding this might be important to learn more about GRPC performance (since closing and re-opening TLS sockets, for instance, might take a lot of time).

Thank you in advance for your response!

Best regards!

[Larry Safran]

As mentioned in the core concepts guide, the exact behavior of closing channels is language dependent.  Note that you can have multiple RPCs simultaneously using the same channel.  As long as a channel is "active" it will stay connected.  For streaming RPCs, the keepalive call option can keep the channel connected even when there are long breaks between messages.

Hope that helps,

  Larry

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