Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6600#issuecomment-108571458
In case you guys have not noticed, there's no variable to check, so you
can't loop on anything. This is just a plain "wake up".
Yes, you could add one, but that would just complicate the code (e.g.
figuring out how much to sleep after a spurious wake up).
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