Failed to pick subchannel for CallbackService
choufler opened this issue · comments
What version of gRPC and what language are you using?
1.36.0
What operating system (Linux, Windows,...) and version?
Linux
What runtime / compiler are you using (e.g. python version or version of gcc)
gcc v 8.3.1
What did you do?
implemented a CallbackService (as descirbed in)
https://github.com/grpc/proposal/blob/master/L67-cpp-callback-api.md
on a server side, started the server on 0.0.0.0, also tried 127.0.0.1
What did you expect to see?
client being able to connect and get dat
What did you see instead?
same issue has here: client is getting an error 'Failed to pick up subchannel'
#23340
experimented with different clients: python, c++ async, python async - same issue.
experimented with different version of addreses.
as long as I change the server implementation back to synchronous service,
I get a service method call immediately.
Make sure you include information that can help us debug (full error message, exception listing, stack trace, logs).
Anything else we should know about your project / environment?
when I enable trace and debug I see the CQ is being polled every second or so until the time out reached.
The first error I get is 'connection attempt timed out before receiving SETTINGS' in chttp2_connector.cc, line 237
The gRPC version you are using is too old. Please try it with the latest one. 1.36 does not have the polling required for the callback API.
thanks,
I am not in a full control to install a newest version.
Which is the lowest one that does have polling, please?