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https://issues.apache.org/jira/browse/SPARK-21369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16081113#comment-16081113
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Apache Spark commented on SPARK-21369:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/18593
> Don't use Scala classes in external shuffle service
> ---------------------------------------------------
>
> Key: SPARK-21369
> URL: https://issues.apache.org/jira/browse/SPARK-21369
> Project: Spark
> Issue Type: Bug
> Components: Shuffle, YARN
> Affects Versions: 2.2.0
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
>
> Right now the external shuffle service uses Scala Tuple2. However, the Scala
> library won't be shaded into the yarn shuffle assembly jar. Then when the
> codes are called, it will throw ClassNotFoundException.
> Right now it's safe by default because we disabled
> spark.reducer.maxReqSizeShuffleToMem. However, to allow using
> spark.reducer.maxReqSizeShuffleToMem, we should remove all usages of Tuples.
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