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https://issues.apache.org/jira/browse/SPARK-14358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223647#comment-15223647
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Apache Spark commented on SPARK-14358:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/12142

> Change SparkListener from a trait to an abstract class, and remove 
> JavaSparkListener
> ------------------------------------------------------------------------------------
>
>                 Key: SPARK-14358
>                 URL: https://issues.apache.org/jira/browse/SPARK-14358
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Scheduler, Spark Core
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>
> Scala traits are difficult to maintain binary compatibility on, and as a 
> result we had to introduce JavaSparkListener. In Spark 2.0 we can change 
> SparkListener from a trait to an abstract class and then remove 
> JavaSparkListener.



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