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From "Daniel Halperin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1002) Enable caching of side-input dependent computations
Date Thu, 30 Mar 2017 17:24:41 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15949459#comment-15949459
] 

Daniel Halperin commented on BEAM-1002:
---------------------------------------

(assigned to [~kenn] just to provide a comment)

> 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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