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  1. Beam
  2. BEAM-10054

Direct Runner execution stalls with test pipeline

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P2
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.23.0
    • Component/s: sdk-py-core
    • Labels:
      None

      Description

      Internally, we have a test pipeline which runs with the DirectRunner. When upgrading from 2.18.0 to 2.21.0 the test failed with the following exception:

      tp = Exception('Monitor task detected a pipeline stall.',), value = None, tb = None
      
          def raise_(tp, value=None, tb=None):
              """
              A function that matches the Python 2.x ``raise`` statement. This
              allows re-raising exceptions with the cls value and traceback on
              Python 2 and 3.
              """
              if value is not None and isinstance(tp, Exception):
                  raise TypeError("instance exception may not have a separate value")
              if value is not None:
                  exc = tp(value)
              else:
                  exc = tp
              if exc.__traceback__ is not tb:
                  raise exc.with_traceback(tb)
      >       raise exc
      E       Exception: Monitor task detected a pipeline stall.
      

      I was able to bisect the error. This commit introduced the failure: https://github.com/apache/beam/commit/ea9b1f350b88c2996cafb4d24351869e82857731

      If the following conditions evaluates to False, the pipeline runs correctly: https://github.com/apache/beam/commit/ea9b1f350b88c2996cafb4d24351869e82857731#diff-2bb845e226f3a97c0f0f737d0558c5dbR1273

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              • Assignee:
                mxm Maximilian Michels
                Reporter:
                mxm Maximilian Michels
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                  Updated:
                  Resolved:

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