jrmccluskey commented on code in PR #32325:
URL: https://github.com/apache/beam/pull/32325#discussion_r1733013379


##########
sdks/python/apache_beam/runners/direct/direct_runner.py:
##########
@@ -516,7 +516,8 @@ def visit_transform(self, applied_ptransform):
         if isinstance(applied_ptransform.transform, ExternalTransform):
           raise RuntimeError(
               "Streaming Python direct runner "
-              "does not support cross-language pipelines.")
+              "does not support cross-language pipelines."
+              "Please use other runners such as DataflowRunner.")

Review Comment:
   Routing to dataflow from an attempted use of the direct runner is a huge 
jump in terms of cost and commitment. This should probably direct users to the 
python portable runner + documentation on how to run xlang pipelines that way 
so we're staying local.



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