{"id":1627,"date":"2014-12-16T19:33:10","date_gmt":"2014-12-16T19:33:09","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1627"},"modified":"2014-12-16T19:33:10","modified_gmt":"2014-12-16T19:33:09","slug":"how-i-learned-stop-worrying-and-love-dynamically-loadable-modular-engines","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/how-i-learned-stop-worrying-and-love-dynamically-loadable-modular-engines\/","title":{"rendered":"Como aprendi a parar de me preocupar e a amar os mecanismos modulares carreg\u00e1veis dinamicamente"},"content":{"rendered":"<h4>O Memcached faz voc\u00ea querer mais<\/h4>\n<p>O Memcached \u00e9 um sistema bastante simples com uma sem\u00e2ntica bastante simples. Muitos usu\u00e1rios desejaram um pouco mais de funcionalidade do que a fornecida de f\u00e1brica, o que levou a v\u00e1rias bifurca\u00e7\u00f5es e projetos relacionados.<\/p>\n<p>Para acomodar o que, na verdade, s\u00e3o apenas diferen\u00e7as m\u00ednimas, muitos projetos surgiram como bifurca\u00e7\u00f5es do memcached ou como projetos totalmente novos:<\/p>\n<ul>\n<li>dbcached<\/li>\n<li>depcached<\/li>\n<li>agente de mem\u00f3ria<\/li>\n<li>memcached-pro<\/li>\n<li>memcachedb<\/li>\n<li>moxi<\/li>\n<li>redis<\/li>\n<li>repcached<\/li>\n<li>cache<\/li>\n<li>tirano de tokyo<\/li>\n<li>cache do tugela<\/li>\n<\/ul>\n<p>...a lista vai muito al\u00e9m disso, sem contar as bifurca\u00e7\u00f5es internas que sabemos que existem em muitas organiza\u00e7\u00f5es.<\/p>\n<p>A maioria deles est\u00e1 fazendo a mesma coisa do ponto de vista do cliente (conjuntos b\u00e1sicos e obten\u00e7\u00e3o de dados codificados), mas quer fazer algo um pouco diferente com os dados que chegam. Alguns oferecem persist\u00eancia, outros replica\u00e7\u00e3o, outros proxy e alguns oferecem novas opera\u00e7\u00f5es inovadoras em seus dados.<\/p>\n<h4>\u00a0<\/h4>\n<h4>Mecanismos de armazenamento do Memcached<\/h4>\n<p>Tendo visto o mesmo padr\u00e3o repetidamente, introduzimos uma estrutura de mecanismo de armazenamento no memcached, permitindo que voc\u00ea altere a maneira como os dados s\u00e3o tratados sem interromper a compatibilidade com os clientes ou negligenciar novos recursos importantes ou corre\u00e7\u00f5es de bugs no manipulador de protocolo front-end.<\/p>\n<p>Voc\u00ea pode pensar nisso como uma vers\u00e3o limitada do que os m\u00f3dulos do servidor da Web Apache oferecem a voc\u00ea. N\u00e3o \u00e9 necess\u00e1rio alterar o servidor inteiro para obter algo diferente.<\/p>\n<p>Que tipos de coisas voc\u00ea pode fazer com a estrutura do mecanismo de armazenamento memcached? Veja a lista acima - esse \u00e9 o conjunto de problemas que est\u00e1vamos tentando resolver.<\/p>\n<p><strong>Novos formatos de armazenamento na mem\u00f3ria<\/strong><\/p>\n<p>Voc\u00ea pode escrever um mecanismo para usar um alocador de mem\u00f3ria alternativo ou alterar a estrutura na mem\u00f3ria do item se achar que pode fazer melhor. A implementa\u00e7\u00e3o do memcached do Facebook, por exemplo, reduz a precis\u00e3o do LRU para economizar uma quantidade consider\u00e1vel de espa\u00e7o em sua escala. Garantimos que isso possa ser facilmente implementado como um mecanismo.<\/p>\n<p>Se voc\u00ea \u00e9 f\u00e3 de C++, pode criar rapidamente um mecanismo que armazena objetos de itens em um mapa STL. Trond Norbye usou isso como exemplo em uma postagem de blog no ano passado.<\/p>\n<p><strong>Armazenamento persistente<\/strong><\/p>\n<p>Um dos primeiros testes de mecanismo adequados foi um mecanismo h\u00edbrido de armazenamento RAM\/flash. Trond tamb\u00e9m fez uma pequena demonstra\u00e7\u00e3o do mecanismo de armazenamento SQLite.<\/p>\n<p>A Zynga est\u00e1 executando um mecanismo de armazenamento persistente na produ\u00e7\u00e3o por tr\u00e1s de seus aplicativos FarmVille e Cafe World usando o NorthScale Membase Server, que agora est\u00e1 em vers\u00e3o beta privada.<\/p>\n<p><strong>Multitenancy<\/strong><\/p>\n<p>Combinado com o SASL, conseguimos criar um mecanismo multilocat\u00e1rio bastante simples que permite a cria\u00e7\u00e3o de caches l\u00f3gicos completamente isolados em uma \u00fanica inst\u00e2ncia do memcached.<\/p>\n<p>Esse mecanismo \u00e9 particularmente interessante porque tamb\u00e9m lida com extens\u00f5es de protocolo para gerenciar com seguran\u00e7a os cont\u00eaineres l\u00f3gicos de forma independente em suas inst\u00e2ncias de servidor.<\/p>\n<p><strong>Motores sem garantia de desempenho<\/strong><\/p>\n<p>Alguns dos projetos do memcached mencionados acima atuam como proxies, nos quais se comunicam com outras inst\u00e2ncias do memcached, injetando intelig\u00eancia entre o cliente e o servidor.<\/p>\n<p>Um autor que escreve um proxy como um mecanismo tem tudo f\u00e1cil. Um mecanismo pode informar ao servidor que n\u00e3o pode atender a uma solicita\u00e7\u00e3o instantaneamente e sair para trabalhar em seu pr\u00f3prio thread at\u00e9 que esteja pronto. O cliente ser\u00e1 suspenso sem afetar nenhum outro cliente. Quando a solicita\u00e7\u00e3o estiver pronta, ele poder\u00e1 notificar que a E\/S foi conclu\u00edda e preparar a resposta.<\/p>\n<p>Isso \u00e9 \u00fatil para muitas outras coisas al\u00e9m de proxies, \u00e9 claro. Eu esperaria que qualquer mecanismo de armazenamento persistente implementasse o mesmo tipo de coisa.<\/p>\n<p><strong>Novos conceitos de armazenamento<\/strong><\/p>\n<p>Tamb\u00e9m deve ser muito f\u00e1cil criar um mecanismo que armazene dados de forma consideravelmente diferente do tipo chave\/valor com o qual voc\u00ea est\u00e1 acostumado.<\/p>\n<p>Se voc\u00ea quiser criar um servidor de tipo de dados abstrato, j\u00e1 temos a estrutura para voc\u00ea e mantemos o n\u00facleo testado, portanto, basta criar sua parte e pronto.<\/p>\n<h4>\u00a0<\/h4>\n<h4>Para onde podemos ir a partir de agora?<\/h4>\n<p>O \u00fanico t\u00f3pico que n\u00e3o abordamos aqui na estrutura do mecanismo \u00e9 como um mecanismo pode dar suporte \u00e0 replica\u00e7\u00e3o (ou seja, lidar com o caso do repcached). Temos ideias e prot\u00f3tipos que permitem que os criadores de mecanismos fa\u00e7am tudo o que precisam fazer sem adicionar sobrecarga desnecess\u00e1ria ao resto do mundo.<\/p>\n<p>E esse \u00e9 o ponto principal da ramifica\u00e7\u00e3o do mecanismo: voc\u00ea s\u00f3 paga pelos recursos de que precisa.<\/p>","protected":false},"excerpt":{"rendered":"<p>Memcached Keeps You Wanting More Memcached is a pretty simple system with pretty simple semantics. Many users have wished for just a little more functionality than provided out of the box which has led to several forks and related projects. [&hellip;]<\/p>","protected":false},"author":34,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[8992],"class_list":["post-1627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.7.1 (Yoast SEO v25.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How I Learned to Stop Worrying and Love Dynamically Loadable Modular Engines - The Couchbase Blog<\/title>\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.couchbase.com\/blog\/pt\/how-i-learned-stop-worrying-and-love-dynamically-loadable-modular-engines\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How I Learned to Stop Worrying and Love Dynamically Loadable Modular Engines\" \/>\n<meta property=\"og:description\" content=\"Memcached Keeps You Wanting More Memcached is a pretty simple system with pretty simple semantics. 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