Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4690#issuecomment-75019602
Ah right. I was glancing at the number of commits and thought it hadn't
been rebased. The problem isn't this shutdown hook but another one in
`yarn.ApplicationMaster`. Dang. Well I don't think the problem is a `null`
shutdown hook, and I don't think it is an error per se. Maybe it's not even
worth logging because it's OK? that is, if we find `close()` is called during
shutdown and so we can't remove a hook, just keep going?
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