This article introduces the working principle, use and importance of message queue Kafka. Kafka is a middleware commonly used by Internet companies to achieve business decoupling and processing performance. The article explains its key concepts such as Topic, Partition and Broker, and discusses how to achieve high availability and reliability. At the same time, it also mentioned how to improve system performance through splitting strategies, as well as Kafka's unique high-performance and scalability optimization measures, such as zero-copy technology....