Path to System Design

SNAKE TEMPLATE FOR REQUIREMENT # Scenario: use-case (if system is big) / interface (if sys is small). Necessary: constrain/hypothesis. Application: service/algorithm, e.g. MVC etc. Kilobit: data. Evolve: agile spring plan, inc. performance. Example of recommender sys for personal radio station. S: recommend a song for a user; like; dislike; skip. N: 5 Millon users online » about 50k qps (quests per sec) » need 1~2 servers only (cuz we can optimize, e. ...