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Posted to issues@spark.apache.org by "Josh Rosen (JIRA)" <ji...@apache.org> on 2016/04/27 18:56:12 UTC

[jira] [Created] (SPARK-14960) Don't perform treeAggregation in local mode

Josh Rosen created SPARK-14960:
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             Summary: Don't perform treeAggregation in local mode
                 Key: SPARK-14960
                 URL: https://issues.apache.org/jira/browse/SPARK-14960
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
            Reporter: Josh Rosen


I don't think that {{treeAggregation}} will help performance in {{local}} mode and based on measurement of some unit tests it looks like it actually severely harms performance in certain cases. Therefore, treeAggregate should fall back to plain aggregate when running in local mode.



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