Mario Davchevski davcevski

WordPress database clean up queries

Orphan rows
Other

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

Install the following requirements:

brew info zeromq
npm install zmq
npm install socket.io
gem install ffi-rzmq

Within the app directory run the following commands in different panes.

ruby worker.rb

	#!/usr/bin/bash

	# Download zeromq
	# Ref http://zeromq.org/intro:get-the-software
	wget https://github.com/zeromq/libzmq/releases/download/v4.2.2/zeromq-4.2.2.tar.gz

	# Unpack tarball package
	tar xvzf zeromq-4.2.2.tar.gz

	# Install dependency

	{
	search(type: REPOSITORY, query: "org:huboard-testing spooky-octo-pug", first: 1) {
	edges {
	node {
	__typename
	... on Repository {
	owner {
	id
	}
	name

	<?php

	// ...

	if ($client->getAccessToken()) {
	// Create analytics service object.
	$youtube = new Google_Service_YouTube($client);

	/**
	* Retrive favourites videos of the user

	function hexToHsl($hex) {
	$hex = array($hex[0].$hex[1], $hex[2].$hex[3], $hex[4].$hex[5]);
	$rgb = array_map(function($part) {
	return hexdec($part) / 255;
	}, $hex);

	$max = max($rgb);
	$min = min($rgb);

	$l = ($max + $min) / 2;

	<?php

	if ( ! defined( 'ABSPATH' ) ) exit;

	class WordPress_Plugin_Template_Settings {
	private $dir;
	private $file;
	private $assets_dir;
	private $assets_url;
	private $settings_base;

	$ helm repo add haproxytech https://haproxytech.github.io/helm-charts
	$ helm repo update
	$ helm install haproxy haproxytech/kubernetes-ingress

	<?php
	/**
	* Plugin Name: Static Templates
	*
	* If most of your site content is in .php template files, and you're tired of
	* creating new pages, assigning them page templates, creating page templates
	* then doing it all over again on production, this plugin is for you.
	*
	* Examples:
	*