Github user ScrapCodes commented on the pull request:
https://github.com/apache/spark/pull/2784#issuecomment-59013875
Hey Aaron,
I increased the interval because its any way a "noise" !, We don't intend
to use the akka's Failure Detector because we have our own heart beat tracking
mechanism in place. If you reduce the time interval the number of System
messages exchanged will rise. It may not be evident as in effect on performance
or in perf benchmark etc, but these are unnecessary.
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