[jira] [Commented] (SPARK-15038) Add ability to do broadcasts in SQL at execution time

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-15038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15289770#comment-15289770 ] 

Apache Spark commented on SPARK-15038:
--------------------------------------

User 'pwoody' has created a pull request for this issue:
https://github.com/apache/spark/pull/13178

> 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
>
> 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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