Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5672#issuecomment-96027028
> See Utils.inShutDown discussion in 4690.
The part about it being expensive? This is hardly a performance sensitive
path. It could also be made faster by first checking `shutdownHooks.shutdown`
before trying the `Runtime.blah` route.
But in any case, not a big deal.
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