shunping commented on code in PR #40568:
URL: https://github.com/apache/beam/pull/40568#discussion_r4278057420


##########
sdks/python/apache_beam/options/pipeline_options_validator.py:
##########
@@ -168,9 +168,9 @@ def is_service_runner(self):
 
     dataflow_endpoint = (
         self.options.view_as(GoogleCloudOptions).dataflow_endpoint)
-    if dataflow_endpoint is None:
-      return False
-    else:
+    # An unset endpoint means the default Dataflow service endpoint (resolved

Review Comment:
   I reworded it slightly to make it less distracting, but I'd prefer to keep 
it. I think having the context right next to the logic makes it much easier for 
future readers to follow.



##########
sdks/python/apache_beam/options/pipeline_options_validator.py:
##########
@@ -274,10 +274,9 @@ def validate_cloud_options(self, view):
       else:
         view.region = default_region
     dataflow_endpoint = view.dataflow_endpoint
-    if dataflow_endpoint is None:
-      errors.extend(
-          self._validate_error(self.ERR_MISSING_OPTION, dataflow_endpoint))
-    else:
+    # dataflow_endpoint is optional. When unset, the client library resolves

Review Comment:
   Same.



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