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https://issues.apache.org/jira/browse/SPARK-21369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-21369.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
2.2.1
Issue resolved by pull request 18593
[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
> Fix For: 2.2.1, 2.3.0
>
>
> 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 because we disabled spark.reducer.maxReqSizeShuffleToMem
> by default. However, to allow using spark.reducer.maxReqSizeShuffleToMem for
> Yarn users, we should remove all usages of Tuples.
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