Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 10 discussion

B because FIFO is made for that specific purpose

Should be B because SQS FIFO queue guarantees message order.

FIFO ensures message order

FIFO is crucial to ensuring the solution works. Two answers use SQS and the author has differentiated between these option by specifically stating in option B “FIFO” On the other hand, SNS also has a FIFO option but the author has chosen to not state that in answer A. If the author had said in option A: “…with FIFO” then A could have been a viable answer. Therefore it has to be Ans B (not A as the author recommends).

FIFO is crucial to ensuring the solution works. Two answers (B & D) use SQS and the author has differentiated between these by specifically stating in answer B “FIFO”. On the other hand (answer A), SNS also has a FIFO option but the author has chosen to not state that in answer A. If the author had been consistent and said in answer A: “…with FIFO” then A could have been a viable answer. Therefore it has to be Ans B (not A as the author recommends).

B. SQS FIFO as order of processing should be same as order of receiving

Use an Amazon SQS FIFO (First-In-First-Out) Queue to ensure that orders are processed in the exact order they are received. The FIFO queue guarantees message order and exactly-once processing.

B for sure

what's up with all these strange answers!!!! I chose B, SQS FIFO is designed for this exact use case, why does the author claim that A is the correct answer??

B seems to be the answer

I'll go ahead with B. But my grouse with Option B is it says "Configure the SQS FIFO queue". You configure the Lambda, not the SQS queue. The role for Lambda to access SQS is auto-configured by AWS.

I think B is the correct answer as SQS FIFO guarantees the order.

SQS FIFO Queue is for this use case.

B SNS - PubSub (think pass along) SQS - Queueing (think batch) Kinesis - Real-time SWF - Queuing but with people

A is not correct becuase, if we do not specify that is an SNS FIFO, we have no guarantee the messages will be processed in publishing order.

Orders have to be processed in order so SQS FIFO is requested here.

Although A is a viable option, the statement says it needs to ensure that messages are processed in the order they are received. That is FIFO by definition.