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[#32004] Ensure all pcollection coders are length prefixed if necessary. #32012

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merged 3 commits into from
Jul 30, 2024

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lostluck
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Prism wasn't length prefix wrapping unknown coders for bundle internal PCollections, or for the parallel input pcollection. This prevented Java and Python SplittableDoFns from correctly encoding their sub element split results, since they pull their coder from the input PCollection.

Go is arguably incorrectly pulling it's coder from the DataSource transform itself, but explains why prism developed this bug.

This change ensures all the internal PCollections are wrapped, and updated with the correct coder. Further prism now only sends precisely the PCollections needed or used in the bundle, instead of the entire set of pipeline PCollections.

Fixes #32004.


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@lostluck
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R: @damondouglas

Definitely weird. Please review, but let's give it a day to get clean reruns I think.

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Friendly ping.

@damondouglas damondouglas self-requested a review July 30, 2024 23:12
@damondouglas damondouglas merged commit e7847c9 into apache:master Jul 30, 2024
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reeba212 pushed a commit to reeba212/beam that referenced this pull request Dec 4, 2024
…ecessary. (apache#32012)

* [apache#32004] Ensure input collection is wrapped. Send precise PCollections.

* error out if there's an issue rewriting coders.

* Unwrap length prefix coders in element hasher.

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Co-authored-by: lostluck <13907733+lostluck@users.noreply.github.com>
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[prism] Java and Python SplittableDoFnTests - invalid stream header (likely coders)
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