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https://issues.apache.org/jira/browse/BEAM-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17145636#comment-17145636
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Beam JIRA Bot commented on BEAM-681:
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This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> DoFns should be serialized at apply time and deserialized when executing
> ------------------------------------------------------------------------
>
> Key: BEAM-681
> URL: https://issues.apache.org/jira/browse/BEAM-681
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Ben Chambers
> Priority: P3
> Labels: sdk-consistency
>
> 1. Serializing DoFns at application time ensures that any modifications of
> fields within the DoFn after application do not accidentally pollute the
> execution. This mirrors the approach taken in Java to provide an
> approximation of lexical-closure (eg., you only need to know the state of the
> DoFn at the time it was applied, not afterwards, to understand its behavior).
> 2. Based on 1, the DIrectRunner should also be deserializing DoFns before
> running them, which should also detect other classes of errors such as using
> the pipeline object (which is not pickleable) within the DoFn
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