lostluck opened a new pull request, #32012:
URL: https://github.com/apache/beam/pull/32012
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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