Here is some research about distributed system.

1. Distributed Cache System

2. Distributed Hash Tables - Load Balancing, API Gateway

3. Distributed Database

4. Distributed Search Systems

5. Distributed Time Series Database

6. Distributed Task Scheduling Systems

7. Distributed Object Storage Systems

8. Distributed Probabilistic Data Structures

9. Case study 1: Consistency and Availability (Consensus) - Spanner, RockDB, Posgres, DynamoDB

10. Case study 2: Amazon - Distributed Transaction (Data Drift)

11. Case study 3: Collaborative high contention - AutoCAD Design

12. Case study 4: Event Streaming Ecommerce - Saleforces

13. Case study 5: Vector Clock database - High-concurrency global consistent database/state.

14. Case study 5: Zero-trust security, Compliance, Audit, Session

15. Case study 6: Apply AI to auto scale, monitor anomaly logs from API Gateway

16. Case study 7: Read/Write seperate - Booking System

17. Case study 8: Matching Service, Task Scheduling Systems - Temporal - Grab