Ahmet Altay updated BEAM-681:
    Labels: sdk-consistency  (was: )

> 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
>            Reporter: Ben Chambers
>            Assignee: Frances Perry
>              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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