Simple cache architecture
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A simple cache architecture uses distributed caching to improve performance over direct client access to databases. Caching occurs through business objects that clients connect to rather than connecting directly to databases. Consistent hashing is used to distribute cache items across servers, and failures are handled through redistribution of users to functioning servers. Concurrency issues are avoided through techniques like compare-and-set operations.
Simple cache architecture
- 4. Disk Accessing is too late
- 5. Operation Time is too long
- 9. Don’t Connect Client between DB directly
- 12. Proxy Server Server Server Server Server User Request K = 10000 N = 5 Origin
- 13. Proxy Server Server Server Server Server User Request K = 10000 N = 4 FAIL : Redistribution about 2000 Users
- 14. Proxy Server Server Server Server Server User Request K = 10000 N = 5 RECOVER: Redistribution about 2500 Users
- 22. A B C 1 2 3 4 5 Add Item 1 Again -> Allocated C Server
- 23. A B C 1 2 3 4 5 1 Recover B Server -> Add Item 1
- 25. Mistake
- 26. A DB Cache B Normal Step 1. A:DB:W 2. A:Cache:W3. B:DB:W 4. B:Cache:W
- 27. A DB Cache B Race Condition Step 1. A:DB:W 3. B:Cache:W2. B:DB:W 4. A:Cache:W
- 28. Solution?
- 29. Global Lock?
- 30. CAS?
- 31. Thank You!