Identifying service boundaries in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a service boundary in microservices?

A service boundary defines the limits of a microservice's responsibilities and data. It separates one service's functionality and data from others to ensure independence and clear ownership.

beginner

Why is identifying service boundaries important?

It helps avoid overlapping responsibilities, reduces dependencies, improves scalability, and makes the system easier to maintain and evolve.

intermediate

Name one common technique to identify service boundaries.

Domain-Driven Design (DDD) is a common technique. It uses business domains and subdomains to define clear service boundaries aligned with real-world concepts.

intermediate

How does data ownership relate to service boundaries?

Each service should own its data and database to avoid tight coupling. This means no other service directly accesses another service’s data store.

advanced

What is a sign that a service boundary might be too broad?

If a service handles too many unrelated tasks or has many dependencies on other services, its boundary might be too broad and should be split.

What is the main goal of defining service boundaries in microservices?

A To share databases between services

B To combine all functions into one service

C To separate responsibilities and data ownership

D To increase dependencies between services

Service boundaries separate responsibilities and data ownership to reduce coupling and improve maintainability.

Which design approach helps identify service boundaries based on business domains?

A Waterfall Model

B Continuous Integration

C Monolithic Architecture

D Domain-Driven Design

Domain-Driven Design uses business domains to define clear service boundaries.

What should each microservice own to maintain clear boundaries?

A All user interfaces

B Its own database

C Shared database

D Other services’ data

Each microservice should own its own database to avoid tight coupling.

If a service has many unrelated responsibilities, what does it indicate?

A The service boundary is too broad

B The service is well designed

C The service is too small

D The service has no dependencies

Many unrelated responsibilities suggest the service boundary is too broad and should be split.

Which of the following is NOT a benefit of clear service boundaries?

A Increased data sharing between services

B Reduced dependencies

C Easier maintenance

D Improved scalability

Clear boundaries reduce data sharing between services to avoid tight coupling.

Explain how you would identify service boundaries in a new microservices project.

Think about how real-world business areas map to services.

Describe signs that indicate a microservice’s boundary needs to be adjusted.

Consider what makes a service hard to manage or scale.