I posted this comment to the article as well but I figure I might get more discussion of it here:<p>What exactly does "30 hours per minute of video is added each day." mean in layman's terms - 30 hours of video are uploaded each day? 30 hours of video are uploaded each minute of the day? I'm having trouble deciphering this metric.
"Database schema upgrades are done by hand."<p>Cool, I thought I was just a total newb for doing schema upgrades by hand! (Well, I <i>am</i> a total newb but anyway)
I think I've read every post on highscalability.com, and this is by far the most deep and detailed writeup they've done. Lots of insight into the huge scale of justin.tv and what it takes to push that kind of traffic.<p>Highlight for me was discovering twicecache. Love the narrow scope and "fit" for the job it's intended for.