Source

https://www.youtube.com/watch?v=a4yX7RUgTxI 6:27

Summary

1. session data: shared single storage to keep user’s session
2. replication: sentinel, cluster for session data
3. distributed lock: as shared lock, allows caller to do one thing only specific key exists, e.g: transaction, stock management
4. rate limiter: use session id as key, set counter and max count, expire time(window size)
5. rank/leader board: sorted set(zset)