Merge pull request #1834 from locustio/grpc-gevent-issue-has-been-fixed

update grpc example, because grpc gevent issue has been fixed

docs/testing-other-systems.rst

@@ -42,6 +42,3 @@ Note: In order to make the `grpcio` Python library gevent-compatible the followi
 import grpc.experimental.gevent as grpc_gevent
 grpc_gevent.init_gevent()
 ```
-
-Note: It is important to close the gRPC channel before stopping the User greenlet; otherwise Locust may not be able to stop executing. 
-This is due to an issue in `grpcio` (see `grpc#15880 <https://github.com/grpc/grpc/issues/15880>`_).

examples/grpc/locustfile.py

@@ -1,3 +1,5 @@
+# make sure you use grpc version 1.39.0 or later,
+# because of https://github.com/grpc/grpc/issues/15880 that affected earlier versions
 import grpc
 import hello_pb2_grpc
 import hello_pb2
@@ -64,12 +66,6 @@ def __init__(self, environment):
         stub = self.stub_class(self._channel)
         self.client = GrpcClient(stub)
 
-    def stop(self, force=False):
-        self._channel_closed = True
-        time.sleep(1)
-        self._channel.close()
-        super().stop(force=True)
-
 
 class HelloGrpcUser(GrpcUser):
     host = "localhost:50051"