Github user arzt commented on the issue:
https://github.com/apache/spark/pull/17774
Thanks for your valuable feedback. I added tests as suggested by
@JasonMWhite . @koeninger the estimated rate is per second summed over all
partitions, is it? The batch time usually is longer. So even values less than 1
but greater than 0 for `backpressureRate` can make sense for one partition. The
casting to long is only needed when the absolute number of messages is
computed, but even this number can be zero for some partitions, e.g. when there
is no lag. I hope I am not confused here. There is also a test covering this.
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