AWS Certified Developer Associate DVA-C02 Practice Question
A developer maintains an application that intermittently fails with HTTP 429 TooManyRequests responses when calling an AWS service. Which approach will most effectively improve the application's resiliency to these throttling errors while minimizing additional load on the service?
Scale up the compute resources of the application to handle more concurrent threads
Increase the client-side request timeout to allow longer service response times
Implement retries with exponential backoff and jitter
Introduce a circuit breaker that immediately rejects calls for a fixed period after a throttle error
Retries that use exponential backoff gradually increase the delay between attempts, reducing the chance of immediate repeated throttling. Adding jitter randomizes each delay so that multiple clients do not retry in lockstep, which further lessens contention on the service. This pattern is the AWS-recommended way to handle transient throttling errors. Longer timeouts, circuit breakers, or scaling compute resources can each address other failure modes but do not directly resolve the cause of HTTP 429 responses as effectively as exponential backoff with jitter.
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AWS Certified Developer Associate DVA-C02
Development with AWS Services
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