Github user maasg commented on the issue:
https://github.com/apache/spark/pull/21188
Hi Jerry,
I don't think the issue is solved with this patch. I plugged the new
function in my notebook and it still shows a rather flat ramp-up:

I created a PR with an alternative rate computation:
https://github.com/apache/spark/pull/21194
Could you have a look?
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