Exam AWS Certified Developer Associate topic 1 question 209 discussion

SQS FIFO queue are suitable for this scenarion given that the requirements say that we have to avoid duplicate and guarantee also the order. Definitely D.

Option D is the best solution because it meets the requirements of avoiding duplicate shipping requests and processing the requests in the order that they arrive. This is achieved by using an Amazon Simple Queue Service (Amazon SQS) FIFO (First-In-First-Out) queue. FIFO queues are designed to ensure that the order in which messages are sent and received is strictly preserved and that each message is delivered once and remains available until a consumer processes and deletes it. By creating an AWS Lambda function to process the requests and setting the SQS FIFO queue as an event source for the Lambda function, the application can write the requests to the SQS queue and the Lambda function will process them in the order that they arrive, without any duplicates. This improves the reliability of the delivery and processing of the requests.

This question is tricky, answer is C. Option D suggests using an Amazon SQS FIFO queue to process the requests, which guarantees that the messages are processed in the order in which they are received. However, it does not address the issue of duplicate messages arriving. FIFO queues do not prevent duplicate messages from being sent, but they ensure that they are processed in the order that they are received. To prevent duplicates, the application needs to be modified to implement deduplication logic. Option C suggests using an AWS Lambda function to process the requests and an Amazon SQS standard queue as an event source. With this configuration, the application can enable deduplication on the queue to ensure that messages are not duplicated. Therefore, option C is a better solution than option D for this scenario.

Definitely D I was expecting a deduplication ID as well in this option but it is fine since 'FIFO' is mentioned

You need an SQS FIFO queue to avoid duplicates. SQS Standard queue can introduce duplicates.

The question is asking "avoid duplicate shipping requests and must process the requests in the order that the requests arrive" which definitely means it's SQS FIFO.

SQS FIFO. It is D

D is the correct answer

https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-exactly-once-processing.html https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-message-order.html

We need SQS FIFO for this