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From "Apache Spark (JIRA)" <>
Subject [jira] [Assigned] (SPARK-15038) Add ability to do broadcasts in SQL at execution time
Date Wed, 18 May 2016 20:40:13 GMT


Apache Spark reassigned SPARK-15038:

    Assignee:     (was: Apache Spark)

> Add ability to do broadcasts in SQL at execution time
> -----------------------------------------------------
>                 Key: SPARK-15038
>                 URL:
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.1
>            Reporter: Patrick Woody
> 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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