You have a legacy application which process message from SQS Queue. The application uses a single thread to poll multiple queues. Which of the following polling timeout will be the best option to avoid latency in processing messages?

Answer options:

A.Use Short Polling with default visibility timeout values.
B.Use Long Polling with higher visibility timeout values.
C.Use Long Polling with lower visibility timeout values.
D.Use Short Polling with higher visibility timeout values.

Correct Answer – A
In the above case, the application is polling multiple queues with a single thread. Long polling will wait for a message or timeout values for each queue which may delay the processing of messages in other queues that have messages to be processed. So, the correct option is to use short polling with default timeout values.
Option B & C are incorrect as using Long Polling will delay the processing of messages in other queues.
Option D is incorrect as using short polling with a higher timeout will not help reduce the latency while processing images.
For more information on polling in Amazon SQS, refer to the following URL-
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long-polling.html