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https://issues.apache.org/jira/browse/BEAM-11715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278236#comment-17278236
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Yifan Mai commented on BEAM-11715:
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Fixing translations.pack_combiners turns out to be more complicated than I
thought. More details in #13877. TLDR the subtransforms for Dataflow are
different than the subtransforms for FnApiRunner.
Instead of fixing translations.pack_combiners, I will instead partially revert
#13763 (which is the PR that added translations.pack_combiners to Dataflow).
This should get Dataflow back into a working state and unblock the release. The
revert PR is #13884.
> Combiner packing creates an incorrect proto
> -------------------------------------------
>
> Key: BEAM-11715
> URL: https://issues.apache.org/jira/browse/BEAM-11715
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Chamikara Madhusanka Jayalath
> Assignee: Yifan Mai
> Priority: P1
> Fix For: 2.28.0
>
> Time Spent: 5h 40m
> Remaining Estimate: 0h
>
> Seems like optimization creates a CombinePerKey transform that does not have
> any sub-transforms. We should fix this by preserving the old structure for
> CombinePerKey (GBK+CombineValues composite).
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