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https://issues.apache.org/jira/browse/BEAM-527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545976#comment-17545976
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Danny McCormick edited comment on BEAM-527 at 6/3/22 3:25 PM:
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This issue has been migrated to [https://github.com/apache/beam/issues/17883]
was (Author: JIRAUSER282469):
This isn't actually real, but this issue has been migrated to
https://github.com/apache/beam/issues/17883
> Pickling error when pickling a nested function
> -----------------------------------------------
>
> Key: BEAM-527
> URL: https://issues.apache.org/jira/browse/BEAM-527
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Ahmet Altay
> Priority: P3
>
> There is a pickling error under the following conditions all happen:
> - a function is defined inside a transforms' apply method
> - then using it as MapFn
> - that function references an instance variable of the outer transform.
> Rewriting the nested function as an unnested DoFn appears to solve the
> problem.
> If the limitations of pickling make it difficult to support nested functions
> then perhaps there's a way to make it easier for users to detect problems
> caused by nested functions and recommend appropriate fixes
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