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Posted to commits@beam.apache.org by "Kenneth Knowles (JIRA)" <ji...@apache.org> on 2016/12/21 21:06:58 UTC

[jira] [Created] (BEAM-1198) ViewFn: explicitly decouple runner materialization of side inputs from SDK-specific mapping

Kenneth Knowles created BEAM-1198:
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             Summary: 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


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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