Category: Application Integration
Service: Amazon Simple Queue Service (SQS)
Answer:
Amazon SQS provides a reliable message delivery service that ensures messages are delivered in the order they are sent and without duplicates. It achieves this through a few key features:
Message Durability: SQS stores messages redundantly across multiple Availability Zones (AZs) within a region, which provides high durability and availability. This means that if one AZ experiences an outage, messages can still be processed from another AZ without loss.
At-least-once Delivery: SQS guarantees that messages will be delivered at least once to a consumer, but it does not guarantee exactly once delivery. In order to ensure that messages are not processed twice, it is recommended to use unique identifiers on messages and to handle duplicate messages on the consumer side.
Visibility Timeout: When a message is retrieved from an SQS queue, it becomes temporarily invisible to other consumers for a specified period of time called the visibility timeout. This ensures that only one consumer is processing a message at a time and reduces the likelihood of duplicate processing.
Dead-Letter Queues: SQS allows you to specify a Dead-Letter Queue (DLQ) for messages that could not be successfully processed by a consumer. This allows you to isolate and troubleshoot failed messages without impacting the primary queue.
Overall, SQS provides a reliable messaging service that can be used for a wide variety of use cases, from simple message passing to complex distributed systems.
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