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https://issues.apache.org/jira/browse/BEAM-14212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529561#comment-17529561
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Kenneth Knowles commented on BEAM-14212:
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[~tvalentyn] do you know how this works in Python? In Java, custom coders are
only used when something is an element of a PCollection, and they do not affect
objects serialized in a closure.
> Custom Coders are ignored sometimes
> -----------------------------------
>
> Key: BEAM-14212
> URL: https://issues.apache.org/jira/browse/BEAM-14212
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Affects Versions: 2.37.0
> Environment: Python 3.8.12
> Reporter: Michael Charkin
> Priority: P2
>
> Custom coders are not used when an object is created inside a function that
> is passed in. It does work in lambdas, I am very confused.
>
> Here is a gist to reproduce it
> [https://gist.github.com/firemuzzy/d3ed68247a2c0841057fca9864d41fe4]
>
> I don't think I have completely narrowed it down because having multiple
> files also seems to change things. Overall I can't reliably get Beam to pick
> up my custom coders, I am defining something wrong?
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