SAP-C02 Q60 · 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** correctly implements a canary release for Lambda using the native **alias traffic shifting** feature.

**Step-by-step breakdown:**
1. **Lambda versions** are immutable snapshots of your function code + configuration. Each deployment creates a new version ($LATEST → v1, v2, etc.).
2. **Lambda aliases** are named pointers to versions (e.g., 'prod' → v1). They act as a stable endpoint.
3. The **`update-alias` command with `--routing-config`** allows you to split traffic between TWO versions behind a single alias. For example: 95% to v1 (stable) and 5% to v2 (canary).
4. This is the **native, built-in** Lambda mechanism for canary releases — no additional services needed.

**How it satisfies each requirement:**
- ✅ **Canary release**: Traffic is gradually shifted to the new versio

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📘 Key Concepts

🏗️ Architecture

⚙️ Operations

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