victorrgez commented on issue #27330:
URL: https://github.com/apache/beam/issues/27330#issuecomment-1653402568

   We have experienced the same issue in loop for around 5 minutes in Python 
3.11 in Dataflow and then it got solved automatically:
   ```
    "Error processing instruction process_bundle-12173-17596. Original 
traceback is
   Traceback (most recent call last):
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/sdk_worker.py",
 line 295, in _execute
       response = task()
                  ^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/sdk_worker.py",
 line 370, in <lambda>
       lambda: self.create_worker().do_instruction(request), request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/sdk_worker.py",
 line 629, in do_instruction
       return getattr(self, request_type)(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/sdk_worker.py",
 line 660, in process_bundle
       bundle_processor = self.bundle_processor_cache.get(
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/sdk_worker.py",
 line 491, in get
       processor = bundle_processor.BundleProcessor(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 903, in __init__
       self.ops = self.create_execution_tree(self.process_bundle_descriptor)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 985, in create_execution_tree
       get_operation(transform_id))) for transform_id in sorted(
                                                         ^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 818, in wrapper
       result = cache[args] = func(*args)
                              ^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 976, in topological_height
       return 1 + max([0] + [
                            ^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 977, in <listcomp>
       topological_height(consumer)
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 818, in wrapper
       result = cache[args] = func(*args)
                              ^^^^^^^^^^^
     File 
"/usr/local/lib/python3.11/site-packages/apache_beam/runners/worker/bundle_processor.py",
 line 978, in topological_height
       for pcoll in descriptor.transforms[transform_id].outputs.values()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   AttributeError: 'list' object has no attribute 'values'
   
   "
   ```


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