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https://issues.apache.org/jira/browse/SPARK-17556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534937#comment-17534937
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Chris Kimmel commented on SPARK-17556:
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[~jlaskowski] I believe the problem is that "Currently in Spark SQL, in order
to perform a broadcast join, the driver must collect the result of an RDD and
then broadcast it." So even if you don't collect a result to your driver node,
the broadcast join mechanism nevertheless creates a lot of traffic to the
driver node.
> Executor side broadcast for broadcast joins
> -------------------------------------------
>
> Key: SPARK-17556
> URL: https://issues.apache.org/jira/browse/SPARK-17556
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core, SQL
> Reporter: Reynold Xin
> Priority: Major
> Attachments: executor broadcast.pdf, executor-side-broadcast.pdf
>
>
> Currently in Spark SQL, in order to perform a broadcast join, the driver must
> collect the result of an RDD and then broadcast it. This introduces some
> extra latency. It might be possible to broadcast directly from executors.
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