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https://issues.apache.org/jira/browse/SPARK-11168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-11168.
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Resolution: Incomplete
> Explore precise behavior of treeAggregate
> -----------------------------------------
>
> Key: SPARK-11168
> URL: https://issues.apache.org/jira/browse/SPARK-11168
> Project: Spark
> Issue Type: Improvement
> Components: MLlib, Spark Core
> Reporter: Joseph K. Bradley
> Priority: Major
> Labels: bulk-closed
>
> It would be worthwhile to make sure treeAggregate is efficient for small
> numbers of partitions. We should examine its exact behavior in terms of the
> structure of the tree aggregation on small problems sizes (maybe # partitions
> from 1 to 20) and for different suggested depths.
> A lot of use cases will be in this range, and if we can speed it up a bit, it
> would be very worthwhile.
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