Github user edwinalu commented on the issue:
https://github.com/apache/spark/pull/20940
@rezsafi, thanks for reviewing. It would be better if the heartbeat wasn't
tied to sampling frequency. Most likely users would want to sample more
frequently, although this would also mean more communication traffic between
executors and driver. I'm out of town right now, but am planning to reschedule
the design discussion when I am back, hopefully in a couple of weeks, and will
invite you.
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