Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4627#issuecomment-74613715
@pwendell I suppose we could revert. A bandaid patch would be to just wrap
this in a try block and ignore exceptions thrown when removing the hook (see
also: `Utils.inShutdown()`). What do you think about just hotfixing in a `Try`?
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