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https://issues.apache.org/jira/browse/SPARK-23502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380942#comment-16380942
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Sital Kedia commented on SPARK-23502:
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>> what happens when you operate on {{sc}} before it's initialized?
We will wait for the future to complete before triggering any action based on
user input, so that should be fine.
>> Is it surprising if Spark shell starts but errors out 20 seconds later?
Yes, that might be one of the side effects. Another major side effect as I
mentioned is not able to print the messages like UI link and app id when the
spark-shell starts.
I just wanted to get some opinion to see if this is something useful for the
community. If we do not think so, we can close this.
> Support async init of spark context during spark-shell startup
> --------------------------------------------------------------
>
> Key: SPARK-23502
> URL: https://issues.apache.org/jira/browse/SPARK-23502
> Project: Spark
> Issue Type: Improvement
> Components: Spark Shell
> Affects Versions: 2.0.0
> Reporter: Sital Kedia
> Priority: Minor
>
> 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 -
> https://github.com/scala/scala/blob/v2.12.2/src/repl/scala/tools/nsc/interpreter/ILoop.scala#L414.
> We will be emulating the behavior for Spark.
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