| Chapter | Problem | Key Concepts | | :--- | :--- | :--- | | 1 | Proximity Service | Geospatial indexing, Quadtrees, Location-based search | | 2 | Nearby Friends | Real-time location updates, WebSockets, Push notifications | | 3 | Google Maps | Route planning, Shortest path algorithms (Dijkstra/A*), Map tiling | | 4 | Distributed Message Queue | Kafka, High throughput, Decoupling, Durability | | 5 | Metrics Monitoring & Alerting | Time-series databases (Prometheus), Aggregation, Alerting | | 6 | Ad Click Event Aggregation | Lambda architecture, Stream/batch processing (Spark, Flink) | | 7 | Hotel Reservation System | Concurrency control (Pessimistic/Optimistic locking), CAP theorem | | 8 | Distributed Email Service | SMTP, POP3, IMAP protocols; Scalable storage, Spam filtering | | 9 | S3-like Object Storage | Blob storage, API design, Data replication, Consistency models | | 10 | Real-time Gaming Leaderboard | Redis Sorted Sets, Low latency, Atomic updates | | 11 | Payment System | ACID compliance, Idempotency, 2-Phase Commit (2PC) | | 12 | Digital Wallet | Transaction management, Security, Fraud detection | | 13 | Stock Exchange | High-performance order matching, LMAX Disruptor, Eventual consistency |
Arjun nodded, but his eyes looked lost. That evening, he found Shanti packing her stall. "Closing forever," she said softly. "No one writes anymore." | Chapter | Problem | Key Concepts |
Global Infrastructure: Building a distributed cloud storage system (like Google Drive) and a secure web crawler at scale. "No one writes anymore
Like YouTube, Google Drive, and Distributed Message Queues. Shortest path algorithms (Dijkstra/A*)
How to incorporate ML into system design.
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