Github user MattWhelan commented on the pull request:
https://github.com/apache/spark/pull/4166#issuecomment-71115860
BTW, I spent a few minutes pondering the deadlock scenario, and the
delegation changes you see here. I'm pretty sure we're safe with 1.6-style
coarse locking, because no class from a parent classloader will ever be able to
refer to any of the child classloader's classes (statically - instances don't
really matter). We don't have funky cyclic references between CLs, so I don't
think we can have funky deadlocks.
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