High-level Design of Twitter

User-system interaction

We begin with the high-level design of the Twitter system, identifying key building blocks and components. We will explore specific components in detail later in this chapter.

• Users post tweets via the load balancer to application servers for persistent storage.

• DNS resolves domain names to IP addresses for communication between services.

• CDN serves frequently requested content from edge servers to reduce latency.

• A load balancer distributes requests to application servers based on traffic and availability.

• The storage system includes SQL and NoSQL databases to store different types of data. We will discuss specific storage systems later.

• Application servers execute business logic and orchestrate component interactions.