9. Push(Figure) User A UpdateAction Inbox (Append to 1’s home timeline) Inbox (Append to 2’s home timeline) Inbox (Append to 3’s home timeline) Followers of User A = 1, 2, 3
12. Pull User I Get home_timeline Outbox (statuses sent by A) Outbox (Statuses sent by B) Outbox (Statuses sent by C) User I’s Following List = A, B, C
35. Read-through and Write-through Products or projects MySQL memcached UDF Cache money for Ruby on Rails Or wrap a proxy for the db driver, in any language
38. Multiget 问题 When memcached servers are CPU bound, adding more memcached servers doesn't help serve more requests. - Jeff Rothschild, Vice President of Technology at Facebook