Your serverless architecture using AWS API Gateway, AWS Lambda, and AWS DynamoDB experienced a large increase in traffic to a sustained 400 requests per second, and dramatically increased in failure rates. Your requests, during normal operation, last 500 milliseconds on average. Your DynamoDB table did not exceed 50% of provisioned throughput, and Table primary keys are designed correctly. What is the most likely issue?
A) Your API Gateway deployment is throttling your requests.
B) Your AWS API Gateway Deployment is bottlenecking on request (de)serialization.
C) You did not request a limit increase on concurrent Lambda function executions.
D) You used Consistent Read requests on DynamoDB and are experiencing semaphore lock.

Question

Quizplus · Accepted Answer

The most likely issue is that you did not request a limit increase on concurrent Lambda function executions. AWS Lambda has a default concurrency limit, and if the traffic increase exceeds this limit, it can lead to increased failure rates.

Your Serverless Architecture Using AWS API Gateway, AWS Lambda, and AWS