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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 05:37:41 UTC

[jira] [Resolved] (SPARK-2253) [Core] Disable partial aggregation automatically when reduction factor is low

     [ https://issues.apache.org/jira/browse/SPARK-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-2253.
---------------------------------
    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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