Netflix architecture overview in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main architectural style used by Netflix for its backend services?

Netflix uses a microservices architecture, where the application is split into many small, independent services that communicate over the network.

beginner

Why does Netflix use a Content Delivery Network (CDN)?

Netflix uses CDNs to cache and deliver video content closer to users, reducing latency and improving streaming quality.

intermediate

What role does the API Gateway play in Netflix's architecture?

The API Gateway acts as a single entry point for client requests, routing them to appropriate microservices and handling concerns like authentication and rate limiting.

advanced

How does Netflix ensure high availability and fault tolerance?

Netflix uses techniques like service replication, fallback mechanisms, circuit breakers, and chaos engineering to maintain availability and handle failures gracefully.

intermediate

What is the purpose of Netflix's service discovery system?

Service discovery helps microservices find and communicate with each other dynamically, without hardcoding network locations.

What architectural pattern does Netflix primarily use for scalability?

A Peer-to-peer architecture

B Monolithic architecture

C Client-server architecture

D Microservices architecture

Netflix uses microservices architecture to scale individual components independently.

Which component in Netflix architecture handles user requests and routes them to services?

A API Gateway

B Database

C Load balancer

D Content Delivery Network

The API Gateway is the single entry point that routes requests to the correct microservices.

How does Netflix improve video streaming performance globally?

A Using a single central server

B Using Content Delivery Networks (CDNs)

C Using peer-to-peer sharing

D Using local caching on user devices only

CDNs cache content near users to reduce latency and improve streaming quality.

What technique does Netflix use to test system resilience by intentionally causing failures?

A Chaos engineering

B Unit testing

C Load testing

D Integration testing

Chaos engineering involves deliberately injecting failures to test system robustness.

What is the purpose of service discovery in Netflix's microservices?

A To store user data

B To cache video content

C To find and connect microservices dynamically

D To authenticate users

Service discovery allows microservices to locate each other without fixed network addresses.

Explain the key components of Netflix's microservices architecture and how they interact to deliver video streaming.

Think about how requests flow from users to services and how Netflix keeps the system reliable.

Describe how Netflix achieves high availability and scalability in its system design.

Consider both software design and infrastructure strategies.

Practice

1. What is the main reason Netflix uses microservices in its architecture?

easy

A. To make the system monolithic and simple

B. To use a single large database for all data

C. To avoid using APIs for communication

D. To break down the system into smaller, manageable parts

Solution

1. Step 1: Understand microservices purpose

   Microservices divide a large system into smaller parts that are easier to manage and update.

2. Step 2: Relate to Netflix architecture

   Netflix uses microservices to handle specific functions separately, improving scalability and maintenance.

3. Final Answer:

   To break down the system into smaller, manageable parts -> Option D

4. Quick Check:

   Microservices = Smaller parts [OK]

Hint: Microservices split big systems into small parts [OK]

Common Mistakes:

• Thinking microservices avoid APIs
• Believing Netflix uses one big database
• Confusing microservices with monolithic design

2. Which of the following correctly describes how Netflix microservices communicate?

easy

A. Through APIs that allow services to talk to each other

B. Using direct database connections between services

C. By sharing the same memory space

D. Using file system locks to coordinate

Solution

1. Step 1: Identify communication method in microservices

   Microservices communicate via APIs, which are defined interfaces for exchanging data.

2. Step 2: Match with Netflix architecture

   Netflix services use APIs to interact, ensuring loose coupling and independent deployment.

3. Final Answer:

   Through APIs that allow services to talk to each other -> Option A

4. Quick Check:

   Microservices communicate via APIs [OK]

Hint: Microservices talk via APIs, not direct DB or memory [OK]

Common Mistakes:

• Assuming services share memory
• Thinking services connect directly to databases
• Believing file locks coordinate services

3. Consider Netflix's microservice for user recommendations. If this service fails, what is the likely impact on the system?

medium

A. Only the recommendation feature will be affected

B. User login will fail for all users

C. The entire Netflix platform will stop working

D. Video streaming will be interrupted for all users

Solution

1. Step 1: Understand microservice isolation

   Each microservice handles a specific function independently, so failure affects only that function.

2. Step 2: Apply to recommendation service failure

   If the recommendation service fails, only recommendations stop working; other features like login or streaming continue.

3. Final Answer:

   Only the recommendation feature will be affected -> Option A

4. Quick Check:

   Microservice failure affects only its feature [OK]

Hint: Microservice failure affects only its own feature [OK]

Common Mistakes:

• Assuming entire platform fails
• Confusing recommendation with login or streaming
• Thinking microservices share failure impact

4. A developer notices that Netflix microservices are tightly coupled, causing deployment issues. What is the best fix?

medium

A. Increase the database size to handle more data

B. Refactor services to communicate only via APIs and avoid direct calls

C. Use shared global variables for communication

D. Merge all microservices into one big service

Solution

1. Step 1: Identify tight coupling problem

   Tightly coupled services depend directly on each other, causing deployment and scaling problems.

2. Step 2: Apply microservice best practice

   Services should communicate only via APIs to remain independent and deploy separately.

3. Final Answer:

   Refactor services to communicate only via APIs and avoid direct calls -> Option B

4. Quick Check:

   Loose coupling via APIs fixes deployment issues [OK]

Hint: Use APIs to keep services independent and deployable [OK]

Common Mistakes:

• Merging services defeats microservice benefits
• Using shared variables breaks isolation
• Increasing DB size doesn't fix coupling

5. Netflix wants to scale its video streaming microservice during peak hours. Which approach best fits its microservices architecture?

hard

A. Store all streaming data in a single database server

B. Combine streaming with user login service to reduce network calls

C. Deploy multiple instances of the streaming service behind a load balancer

D. Disable other microservices to free resources for streaming

Solution

1. Step 1: Understand scaling in microservices

   Scaling means running multiple copies of a service to handle more users.

2. Step 2: Apply to streaming service

   Deploying multiple streaming service instances with a load balancer distributes user requests efficiently.

3. Step 3: Evaluate other options

   Merging services or disabling others breaks microservice principles; single DB server is a bottleneck.

4. Final Answer:

   Deploy multiple instances of the streaming service behind a load balancer -> Option C

5. Quick Check:

   Scale by multiple instances + load balancer [OK]

Hint: Scale by adding instances and load balancer [OK]

Common Mistakes:

• Merging services reduces flexibility
• Single DB server limits scalability
• Disabling services harms user experience