Github user mrszg commented on the pull request:
https://github.com/apache/spark/pull/10089#issuecomment-163532836
Original code (before this patch) has serious error - it doesn't respect
maxRateLimitPerPartition in case when backpressure rate is smaller than number
of partitions. In such case effectiveRateLimitPerPartition equals 0 (because
limit / numPartitions == 0) and in consequence all messages from topic are
consumed at once. According my tests this patch solves this error.
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