Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6973#issuecomment-115371870
None of the changes here are in `SparkContext`; the PR title is misleading,
since you're changing `SparkEnv`. What code path would cause `SparkEnv.stop()`
to be called multiple times?
`SparkContext.stop()` is already idempotent:
if (!stopped.compareAndSet(false, true)) {
logInfo("SparkContext already stopped.")
return
}
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