Cédric Bastin cedricbastin

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

Does the design expect failures to happen regularly and handle them gracefully?
Have we kept things as simple as possible?

	def diff(xs: List[Float]): List[Float] = {
	lazy val average = xs.foldRight((0.0f, 0))((c, acc) => (acc._1 + c, acc._2 + 1))
	val avg = average._1 / average._2
	xs.map(_ - avg)
	}

	def diff2(xs: List[Float]): List[Float] = {
	val nil = (0.0f, 0, ((avg: Float) => Nil: List[Float]))
	val average = xs.foldRight(nil){ (c, acc) =>
	(acc._1 + c, acc._2 + 1, (avg: Float) => (c - avg) :: acc._3(avg))

	import java.io.File
	import language.experimental.macros
	import scala.reflect.macros.Context

	object Macros {

	def LINE: Int = macro lineImpl

	def lineImpl(c: Context): c.Expr[Int] = {
	import c.universe._