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DVA-C02 · Question #281

A developer is updating the production version of an AWS Lambda function to fix a defect. The developer has tested the updated code in a test environment. The developer wants to slowly roll out the up

The correct answer is D. Update the Lambda code and create a new version of the Lambda function. Create a Lambda. Lambda weighted aliases allow routing a configurable percentage of traffic to a new function version, enabling canary or gradual rollout deployments in production.

Submitted by kim_seoul· Mar 5, 2026Deployment

Question

A developer is updating the production version of an AWS Lambda function to fix a defect. The developer has tested the updated code in a test environment. The developer wants to slowly roll out the updates to a small subset of production users before rolling out the changes to all users. Only 10% of the users should be initially exposed to the new code in production. Which solution will meet these requirements?

Options

  • AUpdate the Lambda code and create a new version of the Lambda function. Create a Lambda
  • BCreate a new Lambda function that uses the updated code. Create a Lambda alias for the
  • CUpdate the Lambda code and create a new version of the Lambda function. Create a Lambda
  • DUpdate the Lambda code and create a new version of the Lambda function. Create a Lambda

How the community answered

(22 responses)
  • A
    5% (1)
  • B
    9% (2)
  • C
    14% (3)
  • D
    73% (16)

Why each option

Lambda weighted aliases allow routing a configurable percentage of traffic to a new function version, enabling canary or gradual rollout deployments in production.

AUpdate the Lambda code and create a new version of the Lambda function. Create a Lambda

Creating a new alias that points only to the new version would route 100% of traffic to it immediately, not the required 10% subset.

BCreate a new Lambda function that uses the updated code. Create a Lambda alias for the

Creating an entirely new Lambda function and alias introduces a separate resource with a different ARN, which would require updating the API Gateway integration and does not enable weighted traffic splitting on the original function.

CUpdate the Lambda code and create a new version of the Lambda function. Create a Lambda

An alias pointing solely to the new version with no weighted routing configuration still sends all invocations to the new code, bypassing the 10% gradual rollout requirement.

DUpdate the Lambda code and create a new version of the Lambda function. Create a LambdaCorrect

By publishing a new Lambda version and configuring a Lambda alias with a routing configuration that assigns 10% of traffic to the new version and 90% to the stable version, the developer achieves a controlled canary deployment. The alias ARN stays constant, so no API Gateway or client configuration changes are needed, and traffic can be shifted incrementally after validation.

Concept tested: Lambda alias weighted routing for canary deployments

Source: https://docs.aws.amazon.com/lambda/latest/dg/configuration-aliases.html#configuring-alias-routing

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