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Posted to issues@spark.apache.org by "Yin Huai (JIRA)" <ji...@apache.org> on 2015/07/22 06:50:04 UTC

[jira] [Created] (SPARK-9240) Hybrid aggregate operator

Yin Huai created SPARK-9240:
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             Summary: Hybrid aggregate operator
                 Key: SPARK-9240
                 URL: https://issues.apache.org/jira/browse/SPARK-9240
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
            Reporter: Yin Huai
            Priority: Blocker


We need a hybrid aggregate operator, which first tries hash-based aggregations and gracefully switch to sort-based aggregations if the hash map's memory footprint exceeds a given threshold (how to track memory footprint and how to set the threshold?).



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