In this issue, we’re diving deep into a widely-used middleware: the message queue. Message queues have a long history. They are often used for communication between different systems. Figure 1 illustrates the concept of a message queue by comparing it to how things work at Starbucks.

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Message queues have a long history. They are often used for communication between different systems. A simplified eCommerce flash sale architecture is listed in Figure 2. To maintain service responsiveness despite high traffic, message queues can be integrated at multiple stages to ensure optimal performance. The payment service sends data to three downstream services for different purposes.

Why Do We Need a Message Queue?