Explanation:
The correct answer is A. Using an SQS FIFO queue ensures that messages are processed in the order they are received, which prevents out-of-order updates in the legacy system. Configuring the visibility timeout value allows the legacy system up to 5 minutes to process a message before it becomes visible to other consumers, thus ensuring no message is processed more than once during that interval.
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An AWS-based application processes messages from an Amazon SQS queue in batches and forwards them to another SQS queue for a legacy application, which may take up to 5 minutes to process transactions. To prevent out-of-order updates without modifying the legacy system, which SQS configuration should be used?
A
SQS FIFO queue with visibility timeout configuration.
B
SQS standard queue using SendMessageBatchRequestEntry and DelaySeconds configuration.
C
SQS standard queue using SendMessageBatchRequestEntry and visibility timeout configuration.
D
SQS FIFO queue with DelaySeconds configuration.
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