Exam AWS Certified Developer Associate topic 1 question 403 discussion

It appears every question is paired with an article, if only we could read them all ... https://aws.amazon.com/blogs/compute/improved-failure-recovery-for-amazon-eventbridge

It's C Reserved concurrency allows you to limit the maximum number of simultaneous executions of a Lambda function. By configuring reserved concurrency for the Lambda function, you can control the number of requests sent to the legacy system at the same time, preventing overload. Additionally, you can increase the number of asynchronous invocation retry attempts and the maximum event age for the Lambda function. This helps ensure that failed invocations are retried and that events remain in the system for a longer period, giving the Lambda function more time to process them. Option A, configuring provisioned concurrency for the Lambda function, does not directly address the issue of limiting the number of requests to the legacy system. Provisioned concurrency is used to pre-create and allocate a specified number of concurrent executions to reduce the latency of the first invocation.

Configure provisioned concurrency for the Lambda function. Set the provisioned concurrency to the desired number of maximum simultaneous function calls. This option will limit the amount of request to the legacy app without architecture changes.

A prevails. 1. Use Provisioned Concurrency to limit the ceiling of concurrent lambda 2. `No Architect Change` rules out B,C,D

D seems possible in principle, but the question says no architecture changes so it should be C.

Reserved Concurrency not Provisioned Concurrency.

Configure provisioned concurrency for the Lambda function. Set the provisioned concurrency to the desired number of maximum simultaneous function calls. Provisioned concurrency allows you to configure a specific number of instances of a function to handle incoming requests at any given time. By setting the provisioned concurrency to the desired number of maximum simultaneous function calls, it will ensure that at any time, the number of requests to the legacy system does not exceed that limit, thus preventing the system from being overwhelmed. This solution does not require architecture changes, as it is a configuration change on the Lambda function.

C --- Concurrency

C. Configure reserved concurrency for the Lambda function. Increase the number of asynchronous invocation retry attempts and the maximum event age for the Lambda function.