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Posted to commits@beam.apache.org by "Kenneth Knowles (JIRA)" <ji...@apache.org> on 2016/12/21 22:39:58 UTC
[jira] [Assigned] (BEAM-1198) ViewFn: explicitly decouple runner
materialization of side inputs from SDK-specific mapping
[ https://issues.apache.org/jira/browse/BEAM-1198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kenneth Knowles reassigned BEAM-1198:
-------------------------------------
Assignee: Kenneth Knowles
> ViewFn: explicitly decouple runner materialization of side inputs from SDK-specific mapping
> -------------------------------------------------------------------------------------------
>
> Key: BEAM-1198
> URL: https://issues.apache.org/jira/browse/BEAM-1198
> Project: Beam
> Issue Type: New Feature
> Components: beam-model-fn-api, beam-model-runner-api
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
>
> For side inputs, the field {{PCollectionView.fromIterableInternal}} implies an "iterable" materialization of the contents of a PCollection, which is adapted to the desired user-facing type within a UDF (today the PCollectionView "is" the UDF)
> In practice, runners get adequate performance by special casing just a couple of types of PCollectionView in a rather cumbersome manner.
> The design to improve this is https://s.apache.org/beam-side-inputs-1-pager and this makes the de facto standard approach the actual model.
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