The story about cache

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  • 1. The Story About Cache charsyam@naver.com
  • 2. Use Case: Login
  • 3. Use Case: LoginCommon Case
  • 4. Use Case: Login Common Case Read From DBSelect * from Users where id=‘charsyam’;
  • 5. Use Case: LoginMay be it’s genenallyfast
  • 6. Use Case: LoginBut it’s SlowIn Many Read/Write
  • 7. Use Case: Login Advanced Case Read From CacheGet charsyam
  • 8. Use Case: Loginit’s always fast
  • 9. Use Case: LoginMemcache VS Mysql 136 vs 1613 seconds
  • 10. Use Case: Login250 million User ID Request 10 million
  • 11. Where We Can Use Cache?Just Check User exists? Mail Receive, Tweet MentionGet User’s ProfileGet User’s Timeline
  • 12. CachesMemcache Redis
  • 13. MemcacheAtomic Operation
  • 14. MemcacheAtomic Operation Key:Value
  • 15. MemcacheAtomic Operation Key:Value Single Thread
  • 16. Memcache Processing Over 100,000 TPS
  • 17. RedisKey:Value
  • 18. RedisKey:Value Collection List Sorted Set
  • 19. Cache Layer Storage Layer Cache Application READ WRITE Server UPDATE WRITE DBMS
  • 20. Cache Layer Like Twitter K: UserID, V: Y/N 1st Level Cache Check User exists K: UserID_TIMELINE, V: Tweet IDs 2nd Level Cache Check tweet list K: UserID_TWEETID, V: Tweet Contents 3rd Level Cache Check Content
  • 21. BUTsSometimes Cache is slower than DB
  • 22. Why?DBMS Also Uses CacheIf Cache is hit. It’s faster than …
  • 23. DBMS Storage Layer Application READ Cache Server DBMS WRITE
  • 24. EnvironmentSmall Data SetsRead Just 0.2~03mili
  • 25. ComparisionDB’s Cache: 0.2milimemCache: 0.4mili If you check cache, you spend more time
  • 26. BUTs BUTsCache helps to reduceDBMS’s Loads And It reduces Performance Deviation
  • 27. Use Cache!
  • 28. Thank you!