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Posted to commits@beam.apache.org by "Kenneth Knowles (JIRA)" <ji...@apache.org> on 2017/08/21 21:58:00 UTC

[jira] [Updated] (BEAM-2620) Revisit GroupByKey.createWithFewKeys

     [ https://issues.apache.org/jira/browse/BEAM-2620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-2620:
----------------------------------
    Component/s:     (was: beam-model-runner-api)
                     (was: sdk-java-core)

> Revisit GroupByKey.createWithFewKeys
> ------------------------------------
>
>                 Key: BEAM-2620
>                 URL: https://issues.apache.org/jira/browse/BEAM-2620
>             Project: Beam
>          Issue Type: Bug
>          Components: beam-model
>            Reporter: Thomas Groh
>
> This doesn't have a parallel within the GroupByKeyPayload, so there's currently no way to send it through the Runner API.
> The place it will almost always be created is in a {{Combine.globally()}}.
> It's potentially useful as an optimizer hint. The Dataflow Runner in streaming mode disables combiner lifting unless the GroupByKey has the fewKeys property set to true. 



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