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https://issues.apache.org/jira/browse/SPARK-7936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564271#comment-14564271
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Navis commented on SPARK-7936:
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Added two configuration
1. spark.sql.aggregation.hash.initSize : initialize size of hash. Applied to
both(final, partial) aggregation
2. spark.sql.partial.aggregation.maxEntry : max size of hash for partial
aggregation. should not be used for final aggregation
> Add configuration for initial size of hash for aggregation and limit
> --------------------------------------------------------------------
>
> Key: SPARK-7936
> URL: https://issues.apache.org/jira/browse/SPARK-7936
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Navis
> Priority: Minor
>
> Partial aggregation takes a lot of memory and mostly cannot be completed if
> it's not sliced into very small partitions (large in count). This patch is
> for limiting entry size for partial aggregation. Initial size for hash is
> just a bonus.
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