Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/306#issuecomment-39399719
so, you are assuming that the user always explicitly call sc.stop(), but
that's not always true, even the example program in spark's document does not
do that
http://spark.apache.org/docs/latest/quick-start.html#a-standalone-app-in-scala
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