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https://issues.apache.org/jira/browse/SPARK-8137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630893#comment-14630893
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Apache Spark commented on SPARK-8137:
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User 'kmadhugit' has created a pull request for this issue:
https://github.com/apache/spark/pull/7461
> Improve treeAggregate to combine all data on one machine first
> --------------------------------------------------------------
>
> Key: SPARK-8137
> URL: https://issues.apache.org/jira/browse/SPARK-8137
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.4.0
> Reporter: Shivaram Venkataraman
>
> Right now if we have multiple partitions on the same machine we shuffle the
> partitions and don't aggregate them first in treeAggregate. Once we have
> support for shuffle locality, we can get this for free by using the
> executorIds as the keys for aggregation.
> https://github.com/amplab/ml-matrix/blob/master/src/main/scala/edu/berkeley/cs/amplab/mlmatrix/util/Utils.scala#L96
> has an example implementation
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