Udi Meiri created BEAM-7763:
-------------------------------

             Summary: Python DirectRunner _PubSubReadEvaluator creates new 
client per bundle
                 Key: BEAM-7763
                 URL: https://issues.apache.org/jira/browse/BEAM-7763
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Udi Meiri


Lots of credential fetches.
Similar to https://issues.apache.org/jira/browse/BEAM-2264
but in this case the DirectRunner implementation seems to be creating a new 
client for each bundle:
https://github.com/apache/beam/blob/d5d7a7b7d0408d8435031e7bfce1abe2227115f5/sdks/python/apache_beam/runners/direct/transform_evaluator.py#L474

From: 
https://stackoverflow.com/questions/57010426/dataflow-access-to-pubsub-access-tokens



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