robertwb commented on a change in pull request #11148: [BEAM-8335] Adds a
streaming wordcount integration test
URL: https://github.com/apache/beam/pull/11148#discussion_r397489367
##########
File path:
sdks/python/apache_beam/runners/interactive/interactive_runner_test.py
##########
@@ -147,6 +150,97 @@ def process(self, element):
]
self.assertEqual(actual_reified, expected_reified)
+ def test_streaming_wordcount(self):
+ class WordExtractingDoFn(beam.DoFn):
+ def process(self, element):
+ text_line = element.strip()
+ words = text_line.split()
+ return words
+
+ # Add the TestStream so that it can be cached.
+ ib.options.capturable_sources.add(TestStream)
+ ib.options.capture_duration = timedelta(seconds=1)
+
+ p = beam.Pipeline(
+ runner=interactive_runner.InteractiveRunner(),
+ options=StandardOptions(streaming=True))
+
+ data = (
+ p
+ | TestStream()
+ .advance_watermark_to(0)
+ .advance_processing_time(1)
+ .add_elements(['to', 'be', 'or', 'not', 'to', 'be'])
+ .advance_watermark_to(20)
+ .advance_processing_time(1)
+ .add_elements(['to', 'be', 'or', 'not', 'to', 'be'])
+ .advance_watermark_to(40)
+ .advance_processing_time(1)
+ .add_elements(['to', 'be', 'or', 'not', 'to', 'be'])
+ | beam.WindowInto(beam.window.FixedWindows(10))) # yapf: disable
+
+ counts = (
+ data
+ | 'split' >> beam.ParDo(WordExtractingDoFn())
+ | 'pair_with_one' >> beam.Map(lambda x: (x, 1))
+ | 'group' >> beam.GroupByKey()
+ | 'count' >> beam.Map(lambda wordones: (wordones[0],
sum(wordones[1]))))
+
+ # Watch the local scope for Interactive Beam so that referenced
PCollections
+ # will be cached.
+ ib.watch(locals())
+
+ # This is normally done in the interactive_utils when a transform is
+ # applied but needs an IPython environment. So we manually run this here.
+ ie.current_env().track_user_pipelines()
+
+ # This tests that the data was correctly cached.
+ pane_info = PaneInfo(True, True, PaneInfoTiming.UNKNOWN, 0, 0)
+ expected_data_df = pd.DataFrame(
+ [('to', 0, [beam.window.IntervalWindow(0, 10)], pane_info),
Review comment:
I agree that making things explicit can make it easier to understand. What I
was asking was whether adding six items three times each increased the coverage
of adding (say) three items (one duplicate), advancing the watermark, then
adding one or two more.
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