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https://issues.apache.org/jira/browse/BEAM-1002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546032#comment-17546032
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Danny McCormick commented on BEAM-1002:
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This issue has been migrated to https://github.com/apache/beam/issues/17933
> 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
> Priority: P3
>
> 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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