Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/251#issuecomment-38980845
@andrewor14 Yep maybe we can bump this to 100 milliseconds to make it less
inefficient. Waking/sleeping 10 times per second won't impose any measurable
load on the system at all, so I'm not too worried about the busywait
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