Sital Kedia created SPARK-23502:

             Summary: Support async init of spark context during spark-shell 
                 Key: SPARK-23502
             Project: Spark
          Issue Type: Improvement
          Components: Spark Shell
    Affects Versions: 2.0.0
            Reporter: Sital Kedia

Currently, whenever a user starts the spark shell, we initialize the spark 
context before returning the prompt to the user. In environments, where spark 
context initialization takes several seconds, it is not a very good user 
experience for the user to wait for the prompt. Instead of waiting for the 
initialization of spark context, we can initialize it in the background while 
we return the prompt to the user as soon as possible. Please note that even if 
we return the prompt to the user soon, we still need to make sure to wait for 
the spark context initialization to complete before any query is executed. 

Please note that the scala interpreter already does very similar async 
initialization in order to return the prompt to the user faster -
 We will be emulating the behavior for Spark. 

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