Github user rezasafi commented on the issue:
https://github.com/apache/spark/pull/20940
This generally looks good to me. I have some concerns about piggy backing
memory info on heart-beats, since basically this will be a uniform sampling of
memory info and it may make the heart-beat rate tuning necessary for some
useacases to get more accurate info. Unfortunately I don't have any solution
to make the sampling more accurate. So I think this is good for now.
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