python test_empty_singleton_side_input stuck

03:50:25 ======================================================================
03:50:25 ERROR: test_empty_singleton_side_input (apache_beam.transforms.sideinputs_test.SideInputsTest)
03:50:25 ----------------------------------------------------------------------
03:50:25 Traceback (most recent call last):
03:50:25   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Py_VR_Dataflow/src/sdks/python/apache_beam/transforms/sideinputs_test.py", line 149, in test_empty_singleton_side_input
03:50:25     pipeline.run()
03:50:25   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Py_VR_Dataflow/src/sdks/python/apache_beam/testing/test_pipeline.py", line 107, in run
03:50:25     else test_runner_api))
03:50:25   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Py_VR_Dataflow/src/sdks/python/apache_beam/pipeline.py", line 405, in run
03:50:25     self._options).run(False)
03:50:25   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Py_VR_Dataflow/src/sdks/python/apache_beam/pipeline.py", line 418, in run
03:50:25     return self.runner.run_pipeline(self, self._options)
03:50:25   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Py_VR_Dataflow/src/sdks/python/apache_beam/runners/dataflow/test_dataflow_runner.py", line 64, in run_pipeline
03:50:25     self.result.wait_until_finish(duration=wait_duration)
03:50:25   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Py_VR_Dataflow/src/sdks/python/apache_beam/runners/dataflow/dataflow_runner.py", line 1198, in wait_until_finish
03:50:25     (self.state, getattr(self._runner, 'last_error_msg', None)), self)
03:50:25 DataflowRuntimeException: Dataflow pipeline failed. State: FAILED, Error:
03:50:25 Workflow failed. Causes: The Dataflow job appears to be stuck because no worker activity has been seen in the last 1h. You can get help with Cloud Dataflow at https://cloud.google.com/dataflow/support.