acolyer

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?

robert-stuttaford

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Connection

(defprotocol DatomicConnection
  (as-conn [_]))

(extend-protocol DatomicConnection
  datomic.Connection
  (as-conn [c] c)
  datomic.db.Db

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

jcoglan

var BVT = function(width, depth, init, elems) {
  this._width = width;
  this._depth = depth;
  this._leaf  = depth === 1;

  this._shift  = (this._depth - 1) * Math.round(Math.log(width) / Math.log(2));
  this._himask = this._width - 1;
  this._lomask = Math.pow(2, this._shift) - 1;
  this._elems  = elems;
  

allgress

(ns reagent-test.core
  (:require [reagent.core :as reagent :refer [atom]]
            [datascript :as d]
            [cljs-uuid-utils :as uuid]))

(enable-console-print!)

(defn bind
  ([conn q]
   (bind conn q (atom nil)))

swannodette

(ns react-cljs.core
  (:require-macros [reactjs.macros :refer [pure]])
  (:require React [reactjs.core :as r]))

(enable-console-print!)

(declare render-ui)

(defn render-counter [id state cb]
  (pure state

jballanc

(ns space-age)

(defn on-earth [seconds]
  (/ seconds 31557600.0))

(def orbital-periods
  {:mercury 0.2408467
   :venus   0.61519726
   :mars    1.8808158
   :jupiter 11.862615

rabidpraxis

require 'fog'

bucket      = 'bucket-name'
credentials = {
  :provider              => 'AWS',
  :aws_access_key_id     => 'access_key_id',
  :aws_secret_access_key => 'secret_key',
}

fog   = Fog::Storage.new(credentials)

swannodette

;; list comprehensions are often used as a poor man's Prolog
;; consider the following, it has only one solution 
;; [1 1 1 1 1 1 1 1 1 1] yet we actually consider 10^10 possibilities

(for [a (range 1 11)
      b (range 1 11)
      c (range 1 11)
      d (range 1 11)
      e (range 1 11)
      f (range 1 11)

bobby

(ns datomic-helpers
  (:require [datomic.api     :as d]))

;;; Expose Datomic vars here, for convenience

;;; Ring middleware

(defn wrap-datomic
  "A Ring middleware that provides a request-consistent database connection and
  value for the life of a request."