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https://issues.apache.org/jira/browse/SPARK-16719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley updated SPARK-16719:
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Priority: Critical (was: Major)
> RandomForest: communicate fewer trees on each iteration
> -------------------------------------------------------
>
> Key: SPARK-16719
> URL: https://issues.apache.org/jira/browse/SPARK-16719
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Joseph K. Bradley
> Assignee: Joseph K. Bradley
> Priority: Critical
>
> RandomForest currently sends the entire forest to each worker on each
> iteration. This is because (a) the node queue is FIFO and (b) the closure
> references the entire array of trees ({{topNodes}}). (a) causes RFs to
> handle splits in many trees, especially early on in learning. (b) sends all
> trees explicitly.
> Proposal:
> (a) Change the RF node queue to be FILO, so that RFs tend to focus on 1 or a
> few trees before focusing on others.
> (b) Change topNodes to pass only the trees required on that iteration.
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