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https://issues.apache.org/jira/browse/SPARK-15038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-15038:
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Assignee: Apache Spark
> Add ability to do broadcasts in SQL at execution time
> -----------------------------------------------------
>
> Key: SPARK-15038
> URL: https://issues.apache.org/jira/browse/SPARK-15038
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.1
> Reporter: Patrick Woody
> Assignee: Apache Spark
>
> Currently the auto broadcasting done in SparkSQL is asynchronous and done at
> query planning time. If you have a large query with many broadcasts, this can
> end up creating a large amount of memory pressure/possible OOMs all at once
> when it actually isn't necessary.
> The current workaround for these types of queries is to disable broadcast
> joins, which can be prohibitive performance wise. The proposal for this
> ticket is to allow a config point to toggle doing these broadcasts either
> eagerly/asynchronously or doing the broadcasts lazily at execution time.
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