A web application uses a single thread to poll multiple queues of Amazon SQS using long-polling having a wait time set as 15 seconds. This is causing a delay in the processing of messages in a queue. Which of the following best practices can be used to enhance message processing performance without any cost impact?

Answer options:

A.Shorten long-poll wait time.
B.Use a single thread to process a single queue using long polling.
C.Use short polling instead of long polling.
D.Use a single thread to process a single queue using short polling.

Correct Answer – B
When an application uses a single thread to query multiple queues, to increase message performance best practice is to have a single thread query single queue & use long polling.
Option A is incorrect as this will not increase performance as a single thread has to wait till long poll wait time on multiple queues which it is using.
Option C is incorrect as short polling can be used in this case, but it will have an additional cost impact.
Option D is incorrect as short polling can be used in this case, but it will have an additional cost impact.
For more information on polling options with Amazon SQS, refer to the following URL-
https://aws.amazon.com/sqs/faqs/