1. Design Uber:
some very useful links:
http://www.infoq.com/presentations/uber-market-platform
http://highscalability.com/blog/2015/9/14/how-uber-scales-their-real-time-market-platform.html
http://www.infoq.com/news/2015/03/uber-realtime-market-platform
http://www.open-open.com/lib/view/open1437574144178.html

Uber's application sharding - ringpop:
https://www.youtube.com/watch?v=OQyqJWQHp3g

Similar architecture of Amazon's dynamo paper:
http://www.allthingsdistributed.com/files/amazon-dynamo-sosp2007.pdf

2. Design Netflix:
http://techblog.netflix.com/ 这里面很多有用的。

3. Design Spotify
http://www.slideshare.net/protocol7/spotify-architecture-pressing-play?qid=aa0c970c-7dd8-4cf9-9e8c-643c068edb92&v=qf1&b=&from_search=1
http://www.slideshare.net/davidpoblador/spotify-bcn2013slideshare?related=1
http://www.slideshare.net/AdamKawa/big-data-at-spotify?related=2
http://www.slideshare.net/AdamKawa/hadoop-adventures-at-spotify-strata-conference-hadoop-world-2013?related=3
http://www.slideshare.net/dj4b1n/data-at-spotify?related=4
http://www.slideshare.net/JimmyMrdell/playlists-at-spotify-cassandra-summit-london-2013