SAA-C03 Q426 · Serverless

Question

A company's application receives requests from customers in JSON format. The company uses Amazon Simple Queue Service (Amazon SQS) to handle the requests. After the application's most recent update, the company's customers reported that requests were being duplicated. A solutions architect discovers that the application is consuming messages from the SQS queue more than once. What is the root cause of the issue?

Accepted Answer

**Answer D: The visibility timeout is shorter than the processing time.**

Here's the step-by-step mechanism:

1. **Consumer picks up a message** from the SQS queue. At this moment, SQS starts a **visibility timeout** clock. The message becomes invisible to all other consumers.

2. **During the visibility timeout**, the consumer is expected to process the message AND delete it from the queue.

3. **If the visibility timeout expires** before the consumer finishes processing and deletes the message, SQS assumes the consumer failed. The message **becomes visible again** in the queue.

4. **Another consumer (or the same consumer)** picks up that same message, resulting in **duplicate processing**.

The scenario states: 'After the application's most recent update, requests were being duplicated

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