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Apache Spark commented on SPARK-3994:
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User 'aarondav' has created a pull request for this issue:
https://github.com/apache/spark/pull/2839
> countByKey / countByValue do not go through Aggregator
> ------------------------------------------------------
>
> Key: SPARK-3994
> URL: https://issues.apache.org/jira/browse/SPARK-3994
> Project: Spark
> Issue Type: Bug
> Reporter: Aaron Davidson
> Assignee: Aaron Davidson
>
> The implementations of these methods are historical remnants of Spark from a time when
the shuffle may have been nonexistent. Now, they can be simplified by plugging into reduceByKey(),
potentially seeing performance and stability improvements.
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