Re:A quick look at the Redis source code
by HeyChinaski on Tuesday October 15, 2013 @12:00PM
(#6554061)
Ah yes, I remember the interval sets article. The first post is a lot more in depth than mine. Both great links, thanks.
http://pauladamsmith.com/articles/redis-under-the-hood.html
http://blog.togo.io/how-to/adding-interval-sets-to-redis
They have both been discussed before though.