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https://issues.apache.org/jira/browse/SPARK-10014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14709698#comment-14709698
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Feynman Liang commented on SPARK-10014:
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I'm unclear why this is necessary; {{SparkContext.broadcast}} sends the
variable [only once to each
cluster|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/SparkContext.scala#L1295].
> ML model broadcasts should be stored in private vars
> ----------------------------------------------------
>
> Key: SPARK-10014
> URL: https://issues.apache.org/jira/browse/SPARK-10014
> Project: Spark
> Issue Type: Umbrella
> Components: ML, MLlib
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> Multiple places in MLlib, we broadcast a model before prediction. Since
> prediction may be called many times, we should store the broadcast variable
> in a private var so that we broadcast at most once.
> I'll link subtasks for each problem case I find.
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