[jira] [Assigned] (SPARK-21369) Don't use Scala classes in external shuffle service

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-21369:
------------------------------------

    Assignee: Apache Spark  (was: Shixiong Zhu)

> 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: Apache Spark
>
> 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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