test_approximate_unique_global_by_error is flaky

11:57:47 ======================================================================
11:57:47 ERROR: test_approximate_unique_global_by_error (apache_beam.transforms.stats_test.ApproximateUniqueTest)
11:57:47 ----------------------------------------------------------------------
11:57:47 Traceback (most recent call last):
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/transforms/stats_test.py", line 236, in test_approximate_unique_global_by_error
11:57:47     pipeline.run()
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/testing/test_pipeline.py", line 107, in run
11:57:47     else test_runner_api))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/pipeline.py", line 406, in run
11:57:47     self._options).run(False)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/pipeline.py", line 419, in run
11:57:47     return self.runner.run_pipeline(self, self._options)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/direct/direct_runner.py", line 128, in run_pipeline
11:57:47     return runner.run_pipeline(pipeline, options)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/portability/fn_api_runner.py", line 289, in run_pipeline
11:57:47     default_environment=self._default_environment))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/portability/fn_api_runner.py", line 293, in run_via_runner_api
11:57:47     return self.run_stages(*self.create_stages(pipeline_proto))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/portability/fn_api_runner.py", line 369, in run_stages
11:57:47     stage_context.safe_coders)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/portability/fn_api_runner.py", line 531, in run_stage
11:57:47     data_input, data_output)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/portability/fn_api_runner.py", line 1235, in process_bundle
11:57:47     result_future = self._controller.control_handler.push(process_bundle)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/portability/fn_api_runner.py", line 851, in push
11:57:47     response = self.worker.do_instruction(request)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/sdk_worker.py", line 342, in do_instruction
11:57:47     request.instruction_id)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/sdk_worker.py", line 368, in process_bundle
11:57:47     bundle_processor.process_bundle(instruction_id))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/bundle_processor.py", line 595, in process_bundle
11:57:47     data.ptransform_id].process_encoded(data.data)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/bundle_processor.py", line 143, in process_encoded
11:57:47     self.output(decoded_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 256, in output
11:57:47     cython.cast(Receiver, self.receivers[output_index]).receive(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 143, in receive
11:57:47     self.consumer.process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 594, in process
11:57:47     delayed_application = self.dofn_receiver.receive(o)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 778, in receive
11:57:47     self.process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 784, in process
11:57:47     self._reraise_augmented(exn)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 782, in process
11:57:47     return self.do_fn_invoker.invoke_process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 595, in invoke_process
11:57:47     windowed_value, additional_args, additional_kwargs, output_processor)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 666, in _invoke_process_per_window
11:57:47     windowed_value, self.process_method(*args_for_process))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 921, in process_outputs
11:57:47     self.main_receivers.receive(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 143, in receive
11:57:47     self.consumer.process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 594, in process
11:57:47     delayed_application = self.dofn_receiver.receive(o)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 778, in receive
11:57:47     self.process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 784, in process
11:57:47     self._reraise_augmented(exn)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 782, in process
11:57:47     return self.do_fn_invoker.invoke_process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 454, in invoke_process
11:57:47     windowed_value, self.process_method(windowed_value.value))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 921, in process_outputs
11:57:47     self.main_receivers.receive(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 143, in receive
11:57:47     self.consumer.process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/worker/operations.py", line 594, in process
11:57:47     delayed_application = self.dofn_receiver.receive(o)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 778, in receive
11:57:47     self.process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 784, in process
11:57:47     self._reraise_augmented(exn)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 851, in _reraise_augmented
11:57:47     raise_with_traceback(new_exn)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/target/.tox-py35/py35/lib/python3.5/site-packages/future/utils/__init__.py", line 419, in raise_with_traceback
11:57:47     raise exc.with_traceback(traceback)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 782, in process
11:57:47     return self.do_fn_invoker.invoke_process(windowed_value)
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/runners/common.py", line 454, in invoke_process
11:57:47     windowed_value, self.process_method(windowed_value.value))
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/transforms/core.py", line 1293, in <lambda>
11:57:47     wrapper = lambda x: [fn(x)]
11:57:47   File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py35/build/srcs/sdks/python/apache_beam/testing/util.py", line 130, in _equal
11:57:47     'Failed assert: %r == %r' % (sorted_expected, sorted_actual))
11:57:47 apache_beam.testing.util.BeamAssertException: Failed assert: [True] == [False] [while running 'assert:global_by_error/Match']