Exam AWS Certified Developer Associate topic 1 question 233 discussion

It's B for sure. If the auto scaling group is scaled down the sticky session would be trying to send you to an instance that no longer exists. Storing the sessions in Dynamodb is definitely the best option here.

I was thinking to A, enable sticky session. But it's not correct because when the application scale down (and it scales by requirements), all the user logged with the terminated instance will lose the session for sure. It is better for this scenarion to save the information into a DynamoDB. So, I'll go for B!

The answer is B. For those who are distracted by the Sticky sessions option, please read. Sticky sessions ensure that all requests from the user during the session are sent to the same EC2 target. However, if that EC2 is scaled down and doesn't exist anymore, it won't help with keeping the user signed in. Instead, we need to track the login status in a database. The solution we are looking for is DynamoDB.

B - https://shlomoswidler.com/2010/04/elastic-load-balancing-with-sticky-sessions/

Vote for A

B. EBS is not a good fit for session storage.

B, not sticky session, EBS is not for session storage

Choosing A

I would stick with B. Auto Scaling group is scaled down

B https://www.examtopics.com/discussions/amazon/view/4249-exam-aws-certified-developer-associate-topic-1-question-130/

Sticky session is the answer

A https://docs.aws.amazon.com/elasticloadbalancing/latest/application/sticky-sessions.html