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From "Thomas Groh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BEAM-2620) Revisit GroupByKey.createWithFewKeys
Date Thu, 13 Jul 2017 17:45:00 GMT
Thomas Groh created BEAM-2620:
---------------------------------

             Summary: Revisit GroupByKey.createWithFewKeys
                 Key: BEAM-2620
                 URL: https://issues.apache.org/jira/browse/BEAM-2620
             Project: Beam
          Issue Type: Bug
          Components: beam-model, beam-model-runner-api, sdk-java-core
            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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