Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5672#issuecomment-96094433
Hooks have a priority so that they can choose the order they're executed
in. e.g. if some hook really needs to execute before another one, that's
possible. Similar to how the Spark hook needs to execute before the HDFS one to
avoid exceptions.
The locking shouldn't cause issues - this is not a hot path where avoiding
locks brings any benefit. Outside of shutdown, there's just a handful of places
where the methods are called. During shutdown, everything happens from
`runAll`, so any re-entrant calls already have the lock held and thus can go
through.
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