Kenneth Knowles updated BEAM-652:
    Issue Type: Improvement  (was: New Feature)

> StateNamespaces.window() potentially unstable / stable encodings for windows
> ----------------------------------------------------------------------------
>                 Key: BEAM-652
>                 URL: https://issues.apache.org/jira/browse/BEAM-652
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
> WindowNamespace#stringKey includes a base64 encoding of the window as encoded 
> by the windowCoder. This makes the key unpredictable if we support features 
> such as reloading a pipeline with a new SDK or bugfixed pipeline. The 
> encoding should be stable and documented.
> And even if the SDK's window types are stable and documented, users can 
> define their own windows with coders and these may be less stable / requiring 
> bugfixes. This ticket is to track the issue and any new ideas.
> [1] 
> https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/util/state/StateNamespaces.java#L113

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