mxm opened a new pull request #11777: URL: https://github.com/apache/beam/pull/11777
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: ea9b1f350b88c2996cafb4d24351869e82857731 The fix lets to the pipeline running correctly. 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