Github user jerryshao commented on the issue:

    https://github.com/apache/spark/pull/15134
  
    My concern is that previously Spark will throw an exception if app name is 
not set, while in 2.0 we bring in SparkSession which breaks the convention, so 
do we need to let SparkSession to be aligned with SparkContext or vise versa. 
Also IMHO UUID a not good name, can we figure out a more proper one like what 
we did in SparkSubmit.


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