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https://issues.apache.org/jira/browse/SPARK-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-2253.
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Resolution: Incomplete
> [Core] Disable partial aggregation automatically when reduction factor is low
> -----------------------------------------------------------------------------
>
> Key: SPARK-2253
> URL: https://issues.apache.org/jira/browse/SPARK-2253
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Reynold Xin
> Priority: Major
> Labels: bulk-closed
>
> Once we see enough number of rows in partial aggregation and don't observe
> any reduction, Aggregator should just turn off partial aggregation. This
> reduces memory usage for high cardinality aggregations.
> This one is for Spark core. There is another ticket tracking this for SQL.
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