Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/9946#issuecomment-173399004
> It should ideally be so, but, what happens when it isn't?
What happens is that the user code will die anyway because YARN will kill
the container. The explicit exit here is to work around a bug in certain
version of YARN (and some broken cluster configurations, e.g., unhealthy NMs).
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