Hello all, I'd like to propose a change that would allow the producer performance test to have a warmup phase where the statistics gathered could be separated from statistics gathered during steady state.
Although startup is an important phase of Kafka operations and special attention should be paid to optimizing startup performance, often we would like to understand Kafka performance during steady-state operation, separate from its performance during producer startup. It's common for new producers, like in a fresh producer performance test run, to have high latency during startup. This high latency can complicate the understanding of steady-state performance, even when collecting long-running tests. If we want to understand steady-state latency separate from startup latency, we can collect measurements for each phase in disjoint sets then present statistics on each set independently or as a combined population of measurements. This feature would be completely optional and could be represented by a new command line flag for the producer performance test, '--warmup-records'. KIP: KIP-1052: Enable warmup in producer performance test - Apache Kafka - Apache Software Foundation<https://cwiki.apache.org/confluence/display/KAFKA/KIP-1052%3A+Enable+warmup+in+producer+performance+test> Thank you, Matt Welch
