Designet af et stort system involverer at kombinere mange koncepter — håndtering af massiv skala, valg af passende arkitektur, databaser, caching og styring af trade-offs. Ved at bruge et konkret eksempel (et socialt medie feed) illustreres det, hvordan delene kommer sammen.
Eksempel: et socialt medie nyhedsfeed
Requirements: millions of users; post content; see a feed of followed users' posts;
read-HEAVY (far more feed views than posts); low latency; high availability.
High-level components:
→ CLIENTS → LOAD BALANCER → APPLICATION servers (stateless, horizontally scaled)
→ DATABASES → user/post data (sharded); a graph of follows
→ CACHING (Redis) → hot feeds, posts, user data (crucial for read-heavy load)
→ CDN → media (images/videos)
→ MESSAGE QUEUES → async work (fan-out, notifications)
