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https://issues.apache.org/jira/browse/SPARK-60561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-60561:
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Labels: pull-request-available (was: )
> Judge the adaptive partial aggregation spill check by the recent rows, with a
> higher threshold
> ----------------------------------------------------------------------------------------------
>
> Key: SPARK-60561
> URL: https://issues.apache.org/jira/browse/SPARK-60561
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.4.0
> Reporter: Wenchen Fan
> Priority: Major
> Labels: pull-request-available
>
> Adaptive partial aggregation (SPARK-58511) evaluates its compaction ratio
> periodically and right before its map would spill, against one threshold,
> {{minCompaction}} (default 1.05). Keeping the aggregation at a spill means
> aggregating the rest of the input through spills, which pays off only if that
> input keeps repeating keys. With 1.05, an input whose keys arrive together at
> a ratio of 1.5 keeps aggregating and spills every epoch, while the ratio of
> the whole epoch cannot tell such an input from one whose keys recur across
> the task.
> Judge the evaluation before a spill by the recent rows (those since the
> periodic evaluation before last), whose ratio climbs as the map fills when
> keys recur, and give it its own, higher threshold,
> {{spark.sql.execution.aggregate.adaptivePartialAggregation.minCompactionToSpill}}
> (default 2.0).
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