gRPC - Nginx connection is draining

[stephanustedy]

gRPC version :
v1.10.0

go version :
v1.10.2

OS :
Ubuntu 14.04

I try to use nginx.
setup is :

• use service discovery, it will resolve to multiple server
• each server will have dedicated nginx and do grpc_pass to localhost

I get this error on the client rpc error: code = Unavailable desc = the connection is draining
what happens actually ? and how to fix this.

Thanks

[lyuxuan]

This error means the RPC fails because the connection is draining. This could be caused by server sending goaway or balancer removing the address. I think this issue involves grpc-web as you mention grpc_pass, you may open an issue in their repo and reference this issue there.

At the same time you may run with GRPC_GO_LOG_VERBOSITY_LEVEL=99 GRPC_GO_LOG_SEVERITY_LEVEL=info to gather more debug info. Thanks!

[stephanustedy]

okay.

will open issue and debug more.
Thanks!

[lyuxuan]

FYI #2205 seems relevant to this issue.