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Question 157 - DVA-C02 discussion

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A developer is investigating an issue in part of a company's application. In the application messages are sent to an Amazon Simple Queue Service (Amazon SQS) queue The AWS Lambda function polls messages from the SQS queue and sends email messages by using Amazon Simple Email Service (Amazon SES) Users have been receiving duplicate email messages during periods of high traffic.

Which reasons could explain the duplicate email messages? (Select TWO.)

A.
Standard SQS queues support at-least-once message delivery
Answers
A.
Standard SQS queues support at-least-once message delivery
B.
Standard SQS queues support exactly-once processing, so the duplicate email messages are because of user error.
Answers
B.
Standard SQS queues support exactly-once processing, so the duplicate email messages are because of user error.
C.
Amazon SES has the DomainKeys Identified Mail (DKIM) authentication incorrectly configured
Answers
C.
Amazon SES has the DomainKeys Identified Mail (DKIM) authentication incorrectly configured
D.
The SQS queue's visibility timeout is lower than or the same as the Lambda function's timeout.
Answers
D.
The SQS queue's visibility timeout is lower than or the same as the Lambda function's timeout.
E.
The Amazon SES bounce rate metric is too high.
Answers
E.
The Amazon SES bounce rate metric is too high.
Suggested answer: A

Explanation:

SQS Delivery Behavior:Standard SQS queues guarantee at-least-once delivery, meaning messages may be processed more than once. This can lead to duplicate emails in this scenario.

Visibility Timeout:If the visibility timeout on the SQS queue is too short, a message might become visible for another consumer before the first Lambda function finishes processing it. This can also lead to duplicates.

Amazon SQS Delivery Semantics:[invalid URL removed]

Amazon SQS Visibility Timeout:https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html

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asked 16/09/2024
Freddie Lewis
33 questions
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