[jira] [Created] (BEAM-652) StateNamespaces.window() potentially unstable / stable encodings for windows

["Kenneth Knowles (JIRA)" <ji...@apache.org>]

Kenneth Knowles created BEAM-652:
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             Summary: StateNamespaces.window() potentially unstable / stable encodings for windows
                 Key: BEAM-652
                 URL: https://issues.apache.org/jira/browse/BEAM-652
             Project: Beam
          Issue Type: New Feature
          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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