[jcampbell1]

This was a disappointing read:

It is an interesting question -- Given actual dropbox usage patterns, is there there an caching approach that is better than LRU for real Dropbox customers?

The answer I got was, hybrid LFU/LRU algorithms could work better, but they are complicated and were never tested against real Dropbox access patterns.

[arnsholt]

The ARC algorithm is patented (by IBM according to Wikipedia), so that might be why it's not used at least.

[eblume]

Only so much an intern can do in a summer, I suppose.

[namuorg]

He says that he was an intern back in '11. I'm guessing he's full-time now. Not very clear.

[dudey]

He's a junior now :-)