SAP-C02 Q625 · Serverless

Question

A company built an application based on AWS Lambda deployed in an AWS CloudFormation stack. The last production release of the web application introduced an issue that resulted in an outage lasting several minutes. A solutions architect must adjust the deployment process to support a canary release. Which solution will meet these requirements?

Accepted Answer

**Option A: Create an alias for every new deployed version and use `update-alias` with `routing-config`**

**Step-by-step reasoning:**

1. **Canary release requirement**: The company needs to gradually shift traffic to a new Lambda version to detect issues before full rollout, preventing outages like the one experienced.

2. **Lambda versioning and aliases**: Lambda supports **versions** (immutable snapshots of function code+config) and **aliases** (mutable pointers to versions). An alias can point to **two versions simultaneously** with weighted traffic splitting.

3. **`routing-config` on aliases**: The `aws lambda update-alias` command accepts a `--routing-config` parameter that specifies an `AdditionalVersionWeights` map. For example:
   ```
   aws lambda update-alias --function-name m

📖 Explanation

✅ Correct Answer

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📘 Key Concepts

🏗️ Architecture

⚙️ Operations

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