Github user mingyukim commented on the pull request:
https://github.com/apache/spark/pull/3130#issuecomment-65959927
To add a more specific use case of using Spark without spark-submit, we
have a REST server that has a long-running SparkContext, which serves simple
queries like rdd.take(100) or rdd.count(). This would be possible, but a lot
harder to implement with spark-submit. Spark-submit job will need to act like
another REST server waiting for requests.
I strongly believe that supporting the submission of jobs in an independent
application will be crucial in the wide adoption of Spark in many other
applications.
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