Reynold Xin created SPARK-14358:
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             Summary: 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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