Change grpcio comment, update msg size constant name.

bigtable/google/cloud/bigtable/client.py

@@ -65,8 +65,7 @@
 READ_ONLY_SCOPE = 'https://www.googleapis.com/auth/bigtable.data.readonly'
 """Scope for reading table data."""
 
-_MAX_MSG_LENGTH = 100 * 1024 * 1024
-"""Maximum row size that can be retrieved."""
+_MAX_MSG_LENGTH_100MB = 100 * 1024 * 1024
 
 
 def _make_data_stub(client):
@@ -79,11 +78,11 @@ def _make_data_stub(client):
     :returns: A gRPC stub object.
     """
     if client.emulator_host is None:
-        # NOTE: 'grpc.max_message_length' will be deprecated in the 1.1 release
-        # of grpcio in favor of 'grpc.max_receive_message_length' and
-        # 'grpc.max_send_message_length'.
-        max_msg_length = (('grpc.max_message_length', _MAX_MSG_LENGTH),
-                          ('grpc.max_receive_message_length', _MAX_MSG_LENGTH))
+        # NOTE: 'grpc.max_message_length' will no longer be recognized in
+        # grpcio 1.1 and later.
+        max_msg_length = (('grpc.max_message_length', _MAX_MSG_LENGTH_100MB),
+                          ('grpc.max_receive_message_length',
+                           _MAX_MSG_LENGTH_100MB))
         return make_secure_stub(client.credentials, client.user_agent,
                                 bigtable_pb2.BigtableStub, DATA_API_HOST,
                                 extra_options=max_msg_length)