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https://issues.apache.org/jira/browse/SPARK-14322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221088#comment-15221088
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Apache Spark commented on SPARK-14322:
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User 'hhbyyh' has created a pull request for this issue:
https://github.com/apache/spark/pull/12106
> Use treeReduce instead of reduce in OnlineLDAOptimizer
> ------------------------------------------------------
>
> Key: SPARK-14322
> URL: https://issues.apache.org/jira/browse/SPARK-14322
> Project: Spark
> Issue Type: Improvement
> Components: ML, MLlib
> Reporter: Joseph K. Bradley
>
> OnlineLDAOptimizer uses {{RDD.reduce}} in two places where it could use
> treeReduce. This can cause scalability issues. This should be an easy fix.
> See this line:
> [https://github.com/apache/spark/blob/f12f11e578169b47e3f8b18b299948c0670ba585/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala#L452]
> and a few lines below it.
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