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https://issues.apache.org/jira/browse/SPARK-30732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-30732.
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Resolution: Won't Fix
> BroadcastExchangeExec does not fully honor "spark.broadcast.compress"
> ---------------------------------------------------------------------
>
> Key: SPARK-30732
> URL: https://issues.apache.org/jira/browse/SPARK-30732
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Puneet
> Priority: Major
>
> Setting {{spark.broadcast.compress}} to false disables compression while
> sending broadcast variable to executors
> ([https://spark.apache.org/docs/latest/configuration.html#compression-and-serialization])
> However this does not disable compression for any child relations sent by the
> executors to the driver.
> Setting spark.boradcast.compress to false should disable both sides of the
> traffic, allowing users to disable compression for the whole broadcast join
> for example.
> [https://github.com/puneetguptanitj/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/BroadcastExchangeExec.scala#L89]
> ^here `executeCollectIterator` calls `getByteArrayRdd` which by default
> always gets a compressed stream
>
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