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https://issues.apache.org/jira/browse/SPARK-13926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-13926.
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Resolution: Fixed
Fix Version/s: 2.0.0
> Automatically use Kryo serializer when shuffling RDDs with simple types
> -----------------------------------------------------------------------
>
> Key: SPARK-13926
> URL: https://issues.apache.org/jira/browse/SPARK-13926
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Fix For: 2.0.0
>
>
> Because ClassTags are available when constructing ShuffledRDD we can use
> them to automatically use Kryo for shuffle serialization when the RDD's types
> are guaranteed to be compatible with Kryo (e.g. RDDs whose key, value, and/or
> combiner types are primitives, arrays of primitives, or strings). This is
> likely to result in a large performance gain for many RDD API workloads.
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