The developer team has created a distributed application using Amazon SQS which buffers messages. Currently, the team faces issues when the downstream component cannot process the SQS messages in time. To resolve this issue, the Developer Team wants messages in the Amazon SQS queue to wait a period of time before being processed by the downstream. Which of the following can be used for this purpose?

Answer options:

A.Decrease time period using visibility timeouts.
B.Decrease time period using delay queue.
C.Increase time period using delay queue.
D.Increase time period using visibility timeouts.

Correct Answer – C
Delay Queue will add delay to the message when it`s added to the queue. In the above case, the Application needs additional time to process backend activities before processing new messages. This can be done by increasing the time period of the delay queue. Default Delay is 0 sec which is the minimum value, while the maximum delay can be set is 900 sec.
Options A & D are incorrect as visibility timeouts will be required to be set to hide the message once the subscriber consumes it. In the above case, there should be a delay initially when a message is added to the queue.
Option B is incorrect as decreasing delay timers will make messages available to subscribers quickly.
For more information on delay queues with Amazon SQS, refer to the following URL-
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-delay-queues.html