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https://issues.apache.org/jira/browse/SPARK-14960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15627902#comment-15627902
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Reynold Xin commented on SPARK-14960:
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[~joshrosen] any reason why you closed the pull request?
> Don't perform treeAggregation in local mode
> -------------------------------------------
>
> Key: SPARK-14960
> URL: https://issues.apache.org/jira/browse/SPARK-14960
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Josh Rosen
>
> I don't think that {{treeAggregation}} will help performance in {{local}}
> mode and based on measurement of some unit tests it looks like it actually
> severely harms performance in certain cases. Therefore, treeAggregate should
> fall back to plain aggregate when running in local mode.
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