zhijiangW edited a comment 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-587384919 We ever had the jira ticket [FLINK-9142](https://issues.apache.org/jira/browse/FLINK-9142) about reducing the exclusive buffer from 2 to 1, and then put them into floating buffers instead. That means the total number of buffers on receiver side is not changed. We can also verify this way before determining how many floating buffers are required for keeping the performance.
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