Great post. Thanks this is an awesome blog post, I love it when someone summarizes the good stuff :D! I wish someone would do the same for the AWS cloud papers.

Wow TIL what Tao is and what it can do.

This part is very sexy to me: Facebook's new architecture splits the media into two categories: 1) hot/recently-added media, which is still stored in Haystack, and 2) warm media (still not cold), which is now stored in F4 storage and not in Haystack.