Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3508#issuecomment-65283129
Just to reinforce, we shouldn't add a security manager without better
understanding what impact it has. Feel free to file a bug if you'd like this
investigated, but I like the policy of "don't use System.exit()" better.
In any case, it seems your patch will fail apps that do a `System.exit(0)`
without the security manager, so that's something to think about. Cluster mode
takes the opposite approach (all apps that use `System.exit()` succeed), but
probably for a reason that does not apply here (AM retries).
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