[BEAM-5132] Composite windowing fail with exception: AttributeError: 'NoneType' object has no attribute 'time'

• Type: Bug
• Status: Open
• Priority: P3
• Resolution: Unresolved
• Affects Version/s: 2.5.0
• Component/s: sdk-py-core
• Environment: Windows machine
• Assignee: Unassigned
• Reporter: Bui Nguyen Thang
• Created: 12/Aug/18 19:42
• Updated: 03/Jun/22 22:08

Description

Tried to apply a window function to the existing pipeline that was running fine. Got the following error:

Traceback (most recent call last):
  File "E:\soft\ide\PyCharm 2018.1.2\helpers\pydev\pydevd.py", line 1664, in <module>
    main()
  File "E:\soft\ide\PyCharm 2018.1.2\helpers\pydev\pydevd.py", line 1658, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "E:\soft\ide\PyCharm 2018.1.2\helpers\pydev\pydevd.py", line 1068, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "E:/work/source/ai-data-pipeline-research/metric_pipeline/batch_beam/batch_pipeline_main.py", line 97, in <module>
    result.wait_until_finish()
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\direct\direct_runner.py", line 421, in wait_until_finish
    self._executor.await_completion()
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\direct\executor.py", line 398, in await_completion
    self._executor.await_completion()
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\direct\executor.py", line 444, in await_completion
    six.reraise(t, v, tb)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\direct\executor.py", line 341, in call
    finish_state)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\direct\executor.py", line 378, in attempt_call
    evaluator.process_element(value)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\direct\transform_evaluator.py", line 574, in process_element
    self.runner.process(element)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\common.py", line 577, in process
    self._reraise_augmented(exn)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\common.py", line 618, in _reraise_augmented
    six.reraise(type(new_exn), new_exn, original_traceback)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\common.py", line 575, in process
    self.do_fn_invoker.invoke_process(windowed_value)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\common.py", line 353, in invoke_process
    windowed_value, self.process_method(windowed_value.value))
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\runners\common.py", line 651, in process_outputs
    for result in results:
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 942, in process_entire_key
    state, windowed_values, output_watermark):
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 1098, in process_elements
    self.trigger_fn.on_element(value, window, context)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 488, in on_element
    self.underlying.on_element(element, window, context)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 535, in on_element
    trigger.on_element(element, window, self._sub_context(context, ix))
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 286, in on_element
    '', TimeDomain.REAL_TIME, context.get_current_time() + self.delay)
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 728, in get_current_time
    return self._outer.get_current_time()
  File "C:\Users\thang\.virtualenvs\metric_pipeline-Mpf2nmv6\lib\site-packages\apache_beam\transforms\trigger.py", line 702, in get_current_time
    return self._clock.time()
AttributeError: 'NoneType' object has no attribute 'time' [while running 'combine all sharpe_ratio to list/CombinePerKey/GroupByKey/GroupByWindow']

the composite window function is copied from official documents:
https://beam.apache.org/documentation/programming-guide/#composite-triggers
Please refer to pipeline relevant source code below:

windowing = beam.WindowInto(FixedWindows(1 * 60),
                            trigger=Repeatedly(AfterAny(AfterCount(100), AfterProcessingTime(delay=1 * 60))),
                            accumulation_mode=AccumulationMode.DISCARDING)
valuesPCollection \
| 'calculate sharpe_ratio' >> beam.FlatMap(fn_calculate_sharpe_ratio) \
| 'window sharpe_ratio' >> windowing \
| 'combine all sharpe_ratio to list' >> beam.CombineGlobally(CombineAllToListFn()).without_defaults() \
| 'store sharpe_ratio' >> beam.FlatMap(store_metric_with_now_ts)