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https://issues.apache.org/jira/browse/SPARK-7448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940202#comment-14940202
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Josh Rosen commented on SPARK-7448:
-----------------------------------
I tried a hacky prototype of this and don't remember it showing a huge
difference, but that's not to say that it's not worth trying again. Feel free
to take a stab at this.
> Implement custom bye array serializer for use in PySpark shuffle
> ----------------------------------------------------------------
>
> Key: SPARK-7448
> URL: https://issues.apache.org/jira/browse/SPARK-7448
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, Shuffle
> Reporter: Josh Rosen
> Priority: Minor
>
> PySpark's shuffle typically shuffles Java RDDs that contain byte arrays. We
> should implement a custom Serializer for use in these shuffles. This will
> allow us to take advantage of shuffle optimizations like SPARK-7311 for
> PySpark without requiring users to change the default serializer to
> KryoSerializer (this is useful for JobServer-type applications).
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