Todd Baur toadkicker

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

WebStorm AngularJS Webinar

AngularJS

Install angular with: terminal: bower install angular
Ctrl-space twice
ng stuff works now
Preferences: Editor: angularjs add whitespace
Debug (there is a shortcut so you can do live edit and it updates in chrome)
You can change your code style for html. Preferences: Code Style: HTML (worth a look through these settings)
Cmd+Alt+L to reformat your code

Git Cheat Sheet

Single Git Commands

Initialize a git repo in the current directory

# git init

Add a remote called "origin"

git remote add origin https://github.com/your-username-here/your-repo-here.git

	daemon off;
	error_log /dev/stdout error;

	worker_processes 4;

	events {
	worker_connections 1024;
	}

	# db/migrate/XXXXXXXXXXXXX_add_authentication_token_to_users.rb

	class AddAuthenticationTokenToUsers < ActiveRecord::Migration
	def change
	add_column :users, :authentication_token, :string

	add_index :users, :authentication_token, :unique => true
	end
	end

	ZIP,LAT,LNG
	00601,18.180555, -66.749961
	00602,18.361945, -67.175597
	00603,18.455183, -67.119887
	00606,18.158345, -66.932911
	00610,18.295366, -67.125135
	00612,18.402253, -66.711397
	00616,18.420412, -66.671979
	00617,18.445147, -66.559696
	00622,17.991245, -67.153993

	require "spec_helper"

	describe ExampleMailer do

	describe :new_user do
	let(:user) { FactoryGirl.create :user }

	it "sends to the correct addresses" do
	# :mail is similar to the controller specs 'get', 'post' etc methods
	mail :new_user, user

	// http://davidwalsh.name/javascript-debounce-function

	// Returns a function, that, as long as it continues to be invoked, will not
	// be triggered. The function will be called after it stops being called for
	// N milliseconds. If `immediate` is passed, trigger the function on the
	// leading edge, instead of the trailing.
	function debounce(func, wait, immediate) {
	var timeout;
	return function() {
	var context = this, args = arguments;

	"UserData": {
	"Fn::Base64": { "Fn::Join":["", [
	"#!/bin/bash -ex\n",
	"apt-get update\n",
	"apt-get -y install python-setuptools\n",
	"mkdir aws-cfn-bootstrap-latest\n",
	"curl https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz \| tar xz -C aws-cfn-bootstrap-latest --strip-components 1\n",
	"easy_install aws-cfn-bootstrap-latest\n",
	"/usr/local/bin/cfn-init --stack ", { "Ref":"AWS::StackName" }, " --resource WebServer", " --region ", { "Ref": "AWS::Region" }, "\n",
	"\n",