nm-archetypes-architecture-paradigm-serverless（nm 原型无服务器架构范例）

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The Serverless Architecture Paradigm

When To Use

• Event-driven workloads with variable traffic
• Minimizing operational overhead for cloud-native apps

When NOT To Use

• Long-running processes exceeding function timeout limits
• Applications requiring persistent connections or local state

When to Employ This Paradigm

• When workloads are event-driven and exhibit intermittent or "bursty" traffic patterns.
• When the goal is to minimize infrastructure management and adopt a pay-per-execution cost model.
• When latency constraints from "cold starts" are acceptable for the use case or can be effectively mitigated.

Adoption Steps

1. Identify Functions: Decompose workloads into small, stateless function handlers triggered by events such as HTTP requests, message queues, or scheduled timers.
2. Externalize State: use managed services like databases and queues for all persistent state. Design handlers to be idempotent to validate that repeated executions do not have unintended side effects.
3. Plan Cold-Start Mitigation: For latency-sensitive paths, keep function dependencies minimal. Employ strategies such as provisioned concurrency or "warmer" functions to reduce cold-start times.
4. Implement Instrumentation and Security: Enable detailed tracing and logging for all functions. Adhere to the principle of least privilege with IAM roles and set per-function budgets to control costs.
5. Automate Deployment: Use Infrastructure-as-Code (IaC) frameworks like SAM, CDK, or Terraform to create repeatable and reliable release processes.

Key Deliverables

• An Architecture Decision Record (ADR) that describes function triggers, runtime choices, state management strategies, and cost projections.
• A complete Infrastructure-as-Code (IaC) and CI/CD pipeline for automatically packaging and deploying functions.
• Observability dashboards to monitor key metrics including function duration, error rates, cold-start frequency, and cost.

Risks & Mitigations

• Vendor Lock-in:

- Mitigation: Where feasible, abstract away provider-specific APIs behind your own interfaces or adopt portable frameworks (e.g., Serverless Framework) to reduce dependency on a single cloud vendor.

• Debugging Challenges:

- Mitigation: Tracing execution across distributed functions can be complex. Standardize on specific instrumentation libraries and structured logging to simplify debugging.

• Resource Limits:

- Mitigation: Actively monitor provider-imposed limits, such as concurrency and memory quotas. Design workloads to be shardable or horizontally scalable to stay within these constraints.

Troubleshooting

Common Issues

Command not found Ensure all dependencies are installed and in PATH

Permission errors Check file permissions and run with appropriate privileges

Unexpected behavior Enable verbose logging with --verbose flag