> Bad programmers worry about code, good programmers worry about data structures? Bingo. At this scale, all that matters are the bounds a service can guarantee

> Bad programmers worry about code, good programmers worry about data structures? Bingo. At this scale, all that matters are the bounds a service can guarantee. So long as it can comply to the bounds, the underlying algorithm (let along language, patterns, etc) doesn't matter. Facebook's development of the HHVM is a perfect example of this—they took a nearly universally despised language (from an engineering perspective) and tooled it to fit into the necessary constraints. While crucial for explaining their stack, it's not in any way necessary for any of the individual nodes.