{"id":868,"date":"2013-05-14T20:41:00","date_gmt":"2013-05-14T20:41:00","guid":{"rendered":"https:\/\/159.89.236.238\/?p=868"},"modified":"2020-07-23T12:23:19","modified_gmt":"2020-07-23T06:53:19","slug":"what-database-actually-facebook-uses","status":"publish","type":"post","link":"https:\/\/www.techworm.net\/2013\/05\/what-database-actually-facebook-uses.html","title":{"rendered":"What database  actually FACEBOOK  uses?"},"content":{"rendered":"<div dir=\"ltr\" style=\"text-align: left;\">\n<div style=\"clear: both; text-align: center;\"><\/div>\n<p><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">Hello everyone&#8230;..<\/span><br \/>\n<span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\"><br \/>\n<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif; text-align: justify;\">This is my first blog post and I don&#8217;t know how to write it but still I am trying. So fasten your seat belt and\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif; text-align: justify;\">get ready for the roller coaster that I will ride with you all with some of the questions which arises\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif; text-align: justify;\">sometimes in our mind.<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0\u00a0<\/span><\/p>\n<div style=\"text-align: justify;\"><a name=\"more\"><\/a><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\"><br \/>\n<\/span><\/p>\n<div><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">My today&#8217;s question is <\/span><b style=\"font-family: 'Trebuchet MS', sans-serif;\">&#8220;What database actually Facebook uses?&#8221;<\/b><\/div>\n<div><b style=\"font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/b><\/div>\n<div>\n<div><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">A billion of people are using FACEBOOK. Users are expressing themselves and interacting with their <\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">peer and friends through wall posts, uploading their photos, passing information\u2019s about events and\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">other meaningful information and for that reason facebook needs a large scalable database.<\/span><\/div>\n<\/div>\n<div><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><\/div>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">I could imagine that is why it is a very popular Google search keyword. \ud83d\ude42<\/span><br \/>\n<span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\"><br \/>\n<\/span><\/p>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">I have searched a lot on this topic and come out at a conclusion that Facebook use several database\u00a0techniques. The challenge for Facebook\u2019s engineers has been to keep the site up and running\u00a0smoothly in spite of handling close to billion active users.<\/span><\/div>\n<p><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">This article takes a look at some of the software and techniques they use to accomplish their mission.<\/span><br \/>\n<span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\"><br \/>\n<\/span><\/p>\n<\/div>\n<\/div>\n<h3><a style=\"clear: right; display: inline !important; float: right; font-family: &#039;Trebuchet MS&#039;, sans-serif; margin-bottom: 1em; margin-left: 1em; text-align: center;\" href=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/mysql_logo.png\" data-wpel-link=\"internal\"><img decoding=\"async\" src=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/mysql_logo.png\" alt=\"\" border=\"0\" \/><\/a><span style=\"font-family: Trebuchet MS, sans-serif;\">MYSQL:<\/span><\/h3>\n<div>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">Facebook primarily uses MySQL for structured data <\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">storage such as wall posts, user information, timeline etc. \u00a0This data is replicated between their various data centers.<\/span><\/div>\n<\/div>\n<div><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><\/div>\n<div>\n<h4><span style=\"font-family: Trebuchet MS, sans-serif;\">\u00a0<\/span><\/h4>\n<h3><span style=\"font-family: Trebuchet MS, sans-serif;\">MEMCACHED :<\/span><\/h3>\n<\/div>\n<div style=\"clear: both; text-align: center;\"><a style=\"clear: left; float: left; margin-bottom: 1em; margin-right: 1em;\" href=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/memcached_banner75-300x71.jpg\" data-wpel-link=\"internal\"><img decoding=\"async\" src=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/memcached_banner75-300x71.jpg\" alt=\"\" border=\"0\" \/><\/a><\/div>\n<div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">It is also important to note that Facebook makes heavy use of Memcached,a\u00a0<\/span><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">memory caching system that is used to speed up dynamic database driven websites by caching data\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">and objects in RAM to reduce reading time.<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif; text-align: left;\">Memcached is Facebook\u2019s primary form of caching and greatly reduces the database load. Having a<\/span><\/div>\n<p><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">caching system allows Facebook to be as fast as it is at recalling your data.<\/span><\/p>\n<\/div>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">\u00a0<\/span><\/div>\n<div>\n<p><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">If it doesn\u2019t have to go to the database it will just fetch your data from the cache based on your user\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">ID.<\/span><\/p>\n<h3><span style=\"font-family: Trebuchet MS, sans-serif;\">HAYSTACK :<\/span><\/h3>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">The Photos application is one of Facebook\u2019s most popular features. Up to date, users<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">have uploaded over 15 billion photos which make Facebook the biggest photo sharing website. For\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">each uploaded photo, Facebook generates and stores four images of different sizes, which translates\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">to a total of 60 billion images and 1.5PB of storage. The current growth rate is 220 million new\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">photos per week, which translates to 25TB of additional storage consumed weekly.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">Implements a HTTP based photo server which stores photos in a generic object store called\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">Haystack.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><\/div>\n<h3 style=\"text-align: justify;\"><span style=\"font-family: 'Trebuchet MS', sans-serif; color: #111111; font-size: 19px; text-align: left;\">CASSANDRA :<\/span><\/h3>\n<div style=\"text-align: justify;\">\n<div style=\"clear: both; text-align: center;\"><a style=\"clear: right; float: right; margin-bottom: 1em; margin-left: 1em;\" href=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/cassandra-300x69.png\" data-wpel-link=\"internal\"><img decoding=\"async\" src=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/cassandra-300x69.png\" alt=\"\" border=\"0\" \/><\/a><\/div>\n<\/div>\n<p><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">\u00a0The Apache Cassandra database is the right choice when you need scalability and \u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">high availability without compromising performance. Facebook uses it for its Inbox search.<\/span><\/p>\n<\/div>\n<h3><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><span style=\"font-family: 'Trebuchet MS', sans-serif; color: #111111; font-size: 19px;\">SCRIBE :<\/span><\/h3>\n<div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">\u00a0Scribe is a flexible logging system that Facebook uses for a multitude of purposes<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">internally. It\u2019s been built to be able to handle logging at the scale of Facebook, and automatically\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">handles new logging categories as they show up.<\/span><\/div>\n<\/div>\n<div style=\"text-align: justify;\"><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><\/div>\n<div style=\"text-align: justify;\">\n<h3 style=\"text-align: left;\"><a style=\"clear: right; float: right; font-family: &#039;Trebuchet MS&#039;, sans-serif; margin-bottom: 1em; margin-left: 1em; text-align: center;\" href=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/varnish_cache-150x150.jpeg\" data-wpel-link=\"internal\"><img decoding=\"async\" src=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/varnish_cache-150x150.jpeg\" alt=\"\" border=\"0\" \/><\/a>VARNISH :<\/h3>\n<h4 style=\"text-align: left;\"><\/h4>\n<div>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">Varnish is an HTTP accelerator which can act as a load balancer and also cache content <\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">which can then be served lightning-fast. Facebook uses Varnish to serve photos and profile pictures,handling billions of requests every day.<\/span><\/div>\n<div><\/div>\n<h3 style=\"clear: both;\"><span style=\"font-family: 'Trebuchet MS', sans-serif; color: #111111; font-size: 19px; text-align: left;\">HIPHOP FOR PHP :<\/span><\/h3>\n<\/div>\n<div style=\"clear: both; text-align: center;\"><a style=\"clear: left; float: left; margin-bottom: 1em; margin-right: 1em;\" href=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/HipHop_logo_white-150x150.png\" data-wpel-link=\"internal\"><img decoding=\"async\" src=\"https:\/\/www.techworm.net\/wp-content\/uploads\/2013\/05\/HipHop_logo_white-150x150.png\" alt=\"\" border=\"0\" \/><\/a><\/div>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">HipHop for PHP is a set of PHP execution engines. HipHop was developed by\u00a0<\/span><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">Facebook and was released as open source in early 2010. To date, Facebook has achieved more<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">than a 6x reduction in CPU utilization for the site using HipHop as compared with Apache and Zend\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">PHP.Facebook is able to move fast and maintain a high number of engineers who are able to work\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">across the entire codebase.<\/span><\/div>\n<div><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><\/div>\n<div><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">\u00a0<\/span><\/div>\n<div>\n<div><span style=\"color: #073763; font-family: Trebuchet MS, sans-serif;\">So, while \u201cWhat database does Facebook use?\u201d seems like a simple question, you can see that\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">FACEBOOK developers have added a variety of other systems to make it truly web scalable over their\u00a0<\/span><span style=\"color: #073763; font-family: 'Trebuchet MS', sans-serif;\">500million users.<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hello everyone&#8230;.. This is my first blog post and I don&#8217;t know how to write it but still I am trying. So fasten your seat belt and\u00a0get ready for the roller coaster that I will ride with you all with some of the questions which arises\u00a0sometimes in our mind.\u00a0\u00a0 My today&#8217;s question is &#8220;What database [&hellip;]<\/p>\n","protected":false},"author":46,"featured_media":2129,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21817,35],"tags":[6809,6773],"class_list":{"0":"post-868","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-explanatory","8":"category-facebook","9":"tag-database","10":"tag-facebook"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What database actually FACEBOOK uses?<\/title>\n<meta name=\"description\" content=\"What database actually FACEBOOK uses?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.techworm.net\/2013\/05\/what-database-actually-facebook-uses.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What database actually FACEBOOK uses?\" \/>\n<meta property=\"og:description\" content=\"Hello everyone..... 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