GitHub user kennknowles opened a pull request:

    [BEAM-25] Add DoFn.StateId annotation and validation on fields

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    This introduces just the annotation with analysis and validation in 
`DoFnSignature`. To keep reviews small and easy (and happening in parallel with 
other functionality) my plan is to gradually introduce the annotations and 
validation, while rejecting pipelines that actually use them.

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with (at least) the following in the commit message:

    This closes #1086
commit 739720655224211dd1759bbe2c52fed7c7ecee47
Author: Kenneth Knowles <>
Date:   2016-10-11T04:16:37Z

    Add DoFn.StateId annotation and validation on fields


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