In modern application architecture, queues play a pivotal role in enabling asynchronous communication and decoupling components. While designing your system, choosing between a stateless queue and a stateful queue is critical for achieving the right balance of performance, scalability, and reliability. Let’s explore the differences between stateless and stateful queues , their use cases, and how to choose the best option based on key decision factors. What is a Stateless Queue? A stateless queue is a simple, lightweight message delivery mechanism where: The queue does not persist state about the consumers or the processing of messages. Messages are dequeued and processed without tracking delivery guarantees, retries, or consumer progress. Common examples: Azure Queue Storage , Amazon SQS (Standard Queue) . Characteristics of Stateless Queues: Message Delivery : At-least-once or best-effort delivery. No State Management : No tracking of which consumer has processed which message. ...
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