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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