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https://issues.apache.org/jira/browse/BEAM-1002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Halperin reassigned BEAM-1002:
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    Assignee: Kenneth Knowles  (was: Frances Perry)

> Enable caching of side-input dependent computations
> ---------------------------------------------------
>
>                 Key: BEAM-1002
>                 URL: https://issues.apache.org/jira/browse/BEAM-1002
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model
>            Reporter: Robert Bradshaw
>            Assignee: Kenneth Knowles
>
> Sometimes the kind of computations one wants to perform in startBundle depend 
> on side inputs (and, implicitly, the window). For example, one might want to 
> initialize a (non-serializable) stateful object. In particular, this leads to 
> users incorrectly (in the case of triggered or non-globally-windowed side 
> inputs) memoizing this computation in the first processElement call. 
> One option would be to fold this into a customizable ViewFn. 



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