pnowojski commented on issue #11088: [FLINK-16012][runtime] Reduce the default number of buffers per channel from 2 to 1 URL: https://github.com/apache/flink/pull/11088#issuecomment-593396673 I guess you might be right @wsry. If the distribution was random, the buffers would be filling up gradually and fewer floating buffers should suffice for the smooth progress. We could also explore this option @wsry - replacing the `RoundRobinSelector` with some trivial [pseudo random like this](https://lemire.me/blog/2019/03/19/the-fastest-conventional-random-number-generator-that-can-pass-big-crush/)?
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