.NET Architecture & System Design Interview Question #40

What are the benefits of using queues between services?

Caching, CDN, Queues & Asynchronous Processing Junior Beginner

Quick Interview Answer

Queues reduce direct temporal coupling because the producer does not require the consumer to be available at exactly the same moment. They can buffer bursts, enable independent scaling, and support retries.

Detailed Explanation

Queues reduce direct temporal coupling because the producer does not require the consumer to be available at exactly the same moment. They can buffer bursts, enable independent scaling, and support retries.

The trade-offs include increased architectural complexity, delayed consistency, duplicate processing, message ordering concerns, and more difficult end-to-end tracing.

Code Example

API -> Queue -> Worker 1
          |   -> Worker 2
          |   -> Worker 3

Workers can scale independently.