how to check if server is up/down from a client

[Viktor Khristenko]

Hello,

Setup:

Client, server using callback unary api

question:

How do i check from a client side that server is up/down? What I'm currently doing is to issue grpc with deadline set + wait_for_ready as false. the return code if shows UNAVAILABLE, then server is not there, otherwise needs a retry... 

Here it's not about health check service that could be used, but rather about mechanisms to check either thru channel or stub (issueing rpc)? I was also trying to query the channel state, however not quite clear what indicates an unavailable server (using grpc_connectivity_state)...

the use case is I have a client connected to N servers (1 channel per server) and does some simple load balancing with priorities. this client is actually another server ....

any help is greatly appreciated!

thanks!

VK

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[yas...@google.com]

Sorry for the late reply. 

From what I'm reading, health checking is exactly what you want. I don't understand why you don't want to use it. https://github.com/grpc/grpc/blob/master/doc/health-checking.md

About using the channel state - Just because a channel is not in the connected state, it does not necessarily mean that the server is down.