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https://issues.apache.org/jira/browse/BEAM-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16810719#comment-16810719
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Maximilian Michels commented on BEAM-4781:
------------------------------------------
Not a Flink Runner bug. This is a bug inside the Python SDK:
{noformat}
Traceback (most recent call last):
File "/beam-test/beam-python/src/wordcount.py", line 123, in <module>
"--streaming",
File "/beam-test/beam-python/src/wordcount.py", line 73, in run
p.apply(MaybePrint())
File "/beam-test/venv/lib/python2.7/site-packages/apache_beam/pipeline.py",
line 505, in apply
'_extract_input_pvalues' % (pvalueish, transform))
NotImplementedError: Unable to extract PValue inputs from None; either
<MaybePrint(PTransform) label=[MaybePrint]> does not accept inputs of this
format, or it does not properly override _extract_input_pvalues
{noformat}
> PTransforms that simply return their input cause portable Flink to crash.
> -------------------------------------------------------------------------
>
> Key: BEAM-4781
> URL: https://issues.apache.org/jira/browse/BEAM-4781
> Project: Beam
> Issue Type: Task
> Components: runner-flink
> Reporter: Robert Bradshaw
> Assignee: Aljoscha Krettek
> Priority: Major
> Labels: triaged
>
> E.g.
>
> {code:python}
> class MaybePrint(beam.PTransform):
> def expand(self, pcoll):
> if some_flag:
> pcoll | beam.Map(logging.info)
> return pcoll
> {code}
>
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