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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/06/03 18:35:18 UTC

[GitHub] [beam] kennknowles opened a new issue, #18435: Revisit GroupByKey.createWithFewKeys

kennknowles opened a new issue, #18435:
URL: https://github.com/apache/beam/issues/18435

   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. 
   
   Imported from Jira [BEAM-2620](https://issues.apache.org/jira/browse/BEAM-2620). Original Jira may contain additional context.
   Reported by: tgroh.


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