AWS Certified Developer Associate Practice Test 4

Correct answer - "Use the ChangeMessageVisibility API at the Consumer Level": Here, the question is saying that it takes an unpredictably long time to process messages. Therefore, the consumer must, in case of long processing happening, use the ChangeMessageVisibility API to extend their message timeout and process the message until the end while making sure other consumers won't see that message.

Incorrect:

"Use DeleteMessage" - This deletes the message however you may not be able to delete in time before the message gets sent again

"Change the Visibility Timeout of the Queue" - Here, we cannot predict the consuming time of any message and therefore it's impossible for us to determine a global visilibility timeout. This is why we need our consumers to change them at the message level based on how long they are taking to process messages.

"Use Long Polling" - Eliminates the number of empty responses

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