Help with gRPC Python.

[James Spears]

Hello All, 

I am having a very strange issue with running gRPC Python on my Ubuntu 20 machine. 

I have created a stack over flow question where I have been trying to trouble shoot the problem, but I think it requires someone who has specific knowledge.

Please see the stack overflow question here:

https://stackoverflow.com/questions/63621097/grpc-python-quickstart-helloworld-greeter-client-py-is-hanging-before-printing

Thanks for your time!

James

[James Spears]

I though I may add, if I interupt the client while I am waiting for the response I get:

```

  File "greeter_client.py", line 37, in <module>

    run()

  File "greeter_client.py", line 31, in run

    response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))

  File "/home/james/.local/lib/python3.8/site-packages/grpc/_channel.py", line 824, in __call__

    state, call, = self._blocking(request, timeout, metadata, credentials,

  File "/home/james/.local/lib/python3.8/site-packages/grpc/_channel.py", line 813, in _blocking

    event = call.next_event()

  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 338, in grpc._cython.cygrpc.SegregatedCall.next_event

  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 169, in grpc._cython.cygrpc._next_call_event

  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 163, in grpc._cython.cygrpc._next_call_event

  File "src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx.pxi", line 63, in grpc._cython.cygrpc._latent_event

  File "src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx.pxi", line 42, in grpc._cython.cygrpc._next

KeyboardInterrupt

```

[Lidi Zheng]

HI James,

I think we have already discussed this issue in https://github.com/grpc/grpc/issues/24018. The proven effective workaround is setting an environment variable `GRPC_DNS_RESOLVER=native`. The reason why the resolver behaves differently in Ubuntu 20 is still under investigation.

Lidi

[stefan lei]

Hi. Do you have WeChat ? Bro .