1 scale up
- better cpu
- better sever
2 scale out
Weibo / post / user / follow
1) post
- select post from posts join users on p.send_id = u.id join follows on f.id = u.id where cur_id = f.followee.id (read)
- celebrity -> wirte posts to every follower
throw put. (requests / per second )
response time . (client)
latency (sever)