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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:24:09 UTC
[jira] [Updated] (SPARK-15038) Add ability to do broadcasts in SQL
at execution time
[ https://issues.apache.org/jira/browse/SPARK-15038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-15038:
---------------------------------
Labels: bulk-closed (was: )
> 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
> Priority: Major
> Labels: bulk-closed
>
> 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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