Oleksiy Sayankin commented on SPARK-14358:

[~rxin], please see my comments here: 
https://issues.apache.org/jira/browse/SPARK-17563, but I thinks yes, I can.
And after all I decided to create an issue 

> 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
>             Fix For: 2.0.0
> 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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