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https://issues.apache.org/jira/browse/BEAM-12515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17373696#comment-17373696
 ] 

Valentyn Tymofieiev commented on BEAM-12515:
--------------------------------------------

If reverting the PR shows that the tests passes, we could try to bisect what 
part of PR (likely one of the tests?) triggers this behavior, perhaps it would 
give some clues. 

> Python PreCommit flaking in PipelineOptionsTest.test_display_data
> -----------------------------------------------------------------
>
>                 Key: BEAM-12515
>                 URL: https://issues.apache.org/jira/browse/BEAM-12515
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core, test-failures
>            Reporter: Brian Hulette
>            Priority: P1
>              Labels: flake, sdk-py-core
>          Time Spent: 6h 50m
>  Remaining Estimate: 0h
>
> Seeing this failure pretty frequently on PreCommit since yesterday (06/17).
> The first failure in precommit cron was here: 
> https://ci-beam.apache.org/job/beam_PreCommit_Python_cron/4327/
> Seems related to BEAM-10006, but I'm not sure what changed to make this start 
> flaking recently.
> {code}
> self = <apache_beam.options.pipeline_options_test.PipelineOptionsTest 
> testMethod=test_display_data>
>     def test_display_data(self):
>       for case in PipelineOptionsTest.TEST_CASES:
>         options = PipelineOptions(flags=case['flags'])
>         dd = DisplayData.create_from(options)
> >       hc.assert_that(dd.items, 
> > hc.contains_inanyorder(*case['display_data']))
> apache_beam/options/pipeline_options_test.py:222: 
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
> _ 
> target/.tox-py36-cloud/py36-cloud/lib/python3.6/site-packages/hamcrest/library/collection/issequence_containinginanyorder.py:68:
>  in describe_mismatch
>     self.matches(item, mismatch_description)
> target/.tox-py36-cloud/py36-cloud/lib/python3.6/site-packages/hamcrest/library/collection/issequence_containinginanyorder.py:64:
>  in matches
>     .describe_mismatch(sequence, mismatch_description)
> target/.tox-py36-cloud/py36-cloud/lib/python3.6/site-packages/hamcrest/core/base_matcher.py:34:
>  in describe_mismatch
>     mismatch_description.append_text('was ').append_description_of(item)
> target/.tox-py36-cloud/py36-cloud/lib/python3.6/site-packages/hamcrest/core/base_description.py:34:
>  in append_description_of
>     description = str(value)
> apache_beam/transforms/display.py:359: in __repr__
>     return 'DisplayDataItem({})'.format(json.dumps(self._get_dict()))
> /usr/lib/python3.6/json/__init__.py:231: in dumps
>     return _default_encoder.encode(obj)
> /usr/lib/python3.6/json/encoder.py:199: in encode
>     chunks = self.iterencode(o, _one_shot=True)
> /usr/lib/python3.6/json/encoder.py:257: in iterencode
>     return _iterencode(o, 0)
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
> _ 
> self = <json.encoder.JSONEncoder object at 0x7fef54dd19b0>
> o = <apache_beam.options.value_provider.RuntimeValueProvider object at 
> 0x7feeb2ed5c50>
>     def default(self, o):
>         """Implement this method in a subclass such that it returns
>         a serializable object for ``o``, or calls the base implementation
>         (to raise a ``TypeError``).
>     
>         For example, to support arbitrary iterators, you could
>         implement default like this::
>     
>             def default(self, o):
>                 try:
>                     iterable = iter(o)
>                 except TypeError:
>                     pass
>                 else:
>                     return list(iterable)
>                 # Let the base class default method raise the TypeError
>                 return JSONEncoder.default(self, o)
>     
>         """
>         raise TypeError("Object of type '%s' is not JSON serializable" %
> >                       o.__class__.__name__)
> E       TypeError: Object of type 'RuntimeValueProvider' is not JSON 
> serializable
> /usr/lib/python3.6/json/encoder.py:180: TypeError
> {code}



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