Yanko Simeonoff zecho

a simple git branching model (written in 2013)

This is a very simple git workflow. It (and variants) is in use by many people. I settled on it after using it very effectively at Athena. GitHub does something similar; Zach Holman mentioned it in this talk.

Update: Woah, thanks for all the attention. Didn't expect this simple rant to get popular.

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

Resize a Hard Disk for a Virtual Machine

Our Virtual Machines are provisioned using Vagrant from a Linux base box to run using VirutalBox. If the Hard Disk space runs out and you cannot remove files to free-up space, you can resize the Hard Disk using some VirtualBox and Linux commands.

Some assumptions

The following steps assume you've got a set-up like mine, where:

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

From Symfony 2.3 to Symfony 2.7: the complete guide

Objectives

assume your code doesn't use any deprecated from versions below Symfony 2.3
update dependencies from 2.3 to 2.7
do not support "deprecated", be "Symfony3-ready"
list tasks component by component, bundle by bundle.

	<?php

	namespace MFB\Behat\Subcontext;

	use Behat\Gherkin\Node\PyStringNode;
	use Behat\MinkExtension\Context\RawMinkContext;
	use Symfony\Component\Console\Tester\CommandTester;
	use Symfony\Component\EventDispatcher\EventDispatcher;

	/**

	CREATE EXTENSION tablefunc;

	CREATE TABLE sales(year int, month int, qty int);
	INSERT INTO sales VALUES(2007, 1, 1000);
	INSERT INTO sales VALUES(2007, 2, 1500);
	INSERT INTO sales VALUES(2007, 7, 500);
	INSERT INTO sales VALUES(2007, 11, 1500);
	INSERT INTO sales VALUES(2007, 12, 2000);
	INSERT INTO sales VALUES(2008, 1, 1000);
	INSERT INTO sales VALUES(2009, 5, 2500);

	// NOTICE 2020-04-18
	// Please see the comments below about why this is not a great PRNG.

	// Read summary by @bryc here:
	// https://github.com/bryc/code/blob/master/jshash/PRNGs.md

	// Have a look at js-arbit which uses Alea:
	// https://github.com/blixt/js-arbit

	/**

	CREATE OR REPLACE FUNCTION table_update_notify() RETURNS trigger AS $$
	DECLARE
	id bigint;
	BEGIN
	IF TG_OP = 'INSERT' OR TG_OP = 'UPDATE' THEN
	id = NEW.id;
	ELSE
	id = OLD.id;
	END IF;
	PERFORM pg_notify('table_update', json_build_object('table', TG_TABLE_NAME, 'id', id, 'type', TG_OP)::text);

	// Doctrine ORM
	use Doctrine\ORM\Mapping\ClassMetadata;
	use Doctrine\ORM\EntityManager;
	use Doctrine\ORM\AbstractQuery;
	use Doctrine\ORM\QueryBuilder;

	class RepositorySpec extends ObjectBehavior
	{
	function let(EntityManager $em, ClassMetadata $classMetadata)
	{