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https://issues.apache.org/jira/browse/BEAM-12324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342955#comment-17342955
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Yifan Mai commented on BEAM-12324:
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Actually we already don't pack combiners when in streaming: 
https://github.com/apache/beam/blob/35881d7553335a6c11119b3ad799529d56b51fbe/sdks/python/apache_beam/runners/dataflow/dataflow_runner.py#L467

I wonder if this could be a FnApi thing? In some other logs I am seeing this 
which might be relevant: 
https://gist.github.com/yifanmai/7ad381a89e99f961fb797f6793fb769a

  File "apache_beam/coders/stream.pyx", line 195, in 
apache_beam.coders.stream.InputStream.read_var_int64
RuntimeError: VarLong too long.

> TranslationsTest.test_run_packable_combine_* failing on 
> PostCommit_Py_VR_Dataflow
> ---------------------------------------------------------------------------------
>
>                 Key: BEAM-12324
>                 URL: https://issues.apache.org/jira/browse/BEAM-12324
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-dataflow, sdk-py-core
>            Reporter: Brian Hulette
>            Assignee: Yifan Mai
>            Priority: P1
>
> Failing tests:
> - 
> apache_beam.runners.portability.fn_api_runner.translations_test.TranslationsTest.test_run_packable_combine_globally
> - 
> apache_beam.runners.portability.fn_api_runner.translations_test.TranslationsTest.test_run_packable_combine_per_key
> First failure: 
> https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/7899/
> However note that this suite was timing out since ~April 23 (BEAM-12250), so 
> the breakage could have been introduced a while ago.



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