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https://issues.apache.org/jira/browse/BEAM-9487?focusedWorklogId=611499&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-611499
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ASF GitHub Bot logged work on BEAM-9487:
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Author: ASF GitHub Bot
Created on: 15/Jun/21 17:57
Start Date: 15/Jun/21 17:57
Worklog Time Spent: 10m
Work Description: aaltay commented on pull request #15003:
URL: https://github.com/apache/beam/pull/15003#issuecomment-861714525
R: @udim - I am mostly OOO this and next week. Please do not wait for me.
Please also consider cherry picking to the release, if the original PR is
already in the release branch. (/cc @apilloud - could help.)
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Issue Time Tracking
-------------------
Worklog Id: (was: 611499)
Time Spent: 15h 50m (was: 15h 40m)
> GBKs on unbounded pcolls with global windows and no triggers should fail
> ------------------------------------------------------------------------
>
> Key: BEAM-9487
> URL: https://issues.apache.org/jira/browse/BEAM-9487
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Udi Meiri
> Assignee: Zachary Houfek
> Priority: P2
> Labels: EaseOfUse, starter
> Time Spent: 15h 50m
> Remaining Estimate: 0h
>
> This, according to "4.2.2.1 GroupByKey and unbounded PCollections" in
> https://beam.apache.org/documentation/programming-guide/.
> bq. If you do apply GroupByKey or CoGroupByKey to a group of unbounded
> PCollections without setting either a non-global windowing strategy, a
> trigger strategy, or both for each collection, Beam generates an
> IllegalStateException error at pipeline construction time.
> Example where this doesn't happen in Python SDK:
> https://stackoverflow.com/questions/60623246/merge-pcollection-with-apache-beam
> I also believe that this unit test should fail, since test_stream is
> unbounded, uses global window, and has no triggers.
> {code}
> def test_global_window_gbk_fail(self):
> with TestPipeline() as p:
> test_stream = TestStream()
> _ = p | test_stream | GroupByKey()
> {code}
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