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https://issues.apache.org/jira/browse/BEAM-11938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377699#comment-17377699
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Chamikara Madhusanka Jayalath commented on BEAM-11938:
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I suspect this might be due to Python encoding the output PCollection of
"beam.MapTuple" step using the Python only Pickle coder.
You might have to give the pipeline a type hint for Python to properly use
standard coders.
For example, "beam.MapTuple(...).with_output_types(typehints.KV[str, str])".
> IllegalArgumentException: Unknown Coder URN when using x-lang Kafka
> transforms
> -------------------------------------------------------------------------------
>
> Key: BEAM-11938
> URL: https://issues.apache.org/jira/browse/BEAM-11938
> Project: Beam
> Issue Type: Bug
> Components: cross-language
> Affects Versions: 2.28.0
> Reporter: Chamikara Madhusanka Jayalath
> Assignee: Chamikara Madhusanka Jayalath
> Priority: P2
> Labels: stale-P2
>
> Full stack trace:
> [https://gist.github.com/amit5148/fcf3eea068020283b2c1ef04b57d493b]
>
> Dev thread:
> https://lists.apache.org/thread.html/r7f4df77267c4c20327f7112d17bf0fc0b88d920811e8b4b3c0a899dd%40%3Cdev.beam.apache.org%3E
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