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https://issues.apache.org/jira/browse/SPARK-928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15218989#comment-15218989
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Josh Rosen commented on SPARK-928:
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It looks like we'll _finally_ be able to do this after SPARK-11416 goes in.
> Add support for Unsafe-based serializer in Kryo 2.22
> ----------------------------------------------------
>
> Key: SPARK-928
> URL: https://issues.apache.org/jira/browse/SPARK-928
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Matei Zaharia
> Priority: Minor
> Labels: starter
>
> This can reportedly be quite a bit faster, but it also requires Chill to
> update its Kryo dependency. Once that happens we should add a
> spark.kryo.useUnsafe flag.
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