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https://issues.apache.org/jira/browse/SPARK-17556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15529439#comment-15529439
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Liang-Chi Hsieh commented on SPARK-17556:
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Actually I am hesitant to add the feature to handle the case you said. One
reason is, I don't think it is highly possible to have the case. It only occurs
when the executor exists before its piece of object data is fetched by other
executors.
I prefer to add a config to enable the executor side broadcast and add the
detailed document.
> 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
> 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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