A company has run a major auction platform where people buy and sell a wide range of products. The platform requires that transactions from buyers and sellers get processed in exactly the order received. At the moment, the platform is implemented using RabbitMQ which is a light-weighted queue system. The company consulted you to migrate the on-premise platform to AWS. How should you design the migration plan? (Select TWO)

Answer options:

A.When the bids are received, send the bids to an SQS FIFO queue before they are processed.
B.When the users have submitted the bids from the frontend, the backend service delivers the messages to an SQS standard queue.
C.Add a message group ID to the messages before they are sent to the SQS queue so that the message processing is in a strict order.
D.Use an EC2 or Lambda to add a deduplication ID to the messages before the messages are sent to the SQS queue to ensure that bids are processed in the right order.

Correct Answer – A, C
SQS has 2 types - standard queue and FIFO queue. In this case, the FIFO queue should be chosen as the order of message processing is critical to the application. FIFO queue has the below key features.
Option A is CORRECT: Because the SQS FIFO queue can help with the message processing in the right order.
Option B is incorrect: Because the SQS standard queue may have an issue that some messages are handled in the wrong sequence.
Option C is CORRECT: Because the message group ID is a feature to help with the FIFO delivery. Messages that belong to the same message group are always processed one by one, in a strict order relative to the message group.
Option D is incorrect: Because deduplication ID is a method to help on preventing messages to be processed duplicately, which is not used to guarantee the message order.