{"id":7282,"date":"2019-08-09T10:00:02","date_gmt":"2019-08-09T17:00:02","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=7282"},"modified":"2025-06-13T17:21:59","modified_gmt":"2025-06-14T00:21:59","slug":"couchbase-6-5-scan-consistency-in-analytics","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/couchbase-6-5-scan-consistency-in-analytics\/","title":{"rendered":"Couchbase 6.5 - Consist\u00eancia de varredura no Analytics"},"content":{"rendered":"<p><span style=\"font-weight: 400\">Desde o GA em novembro de 2018, o Couchbase Analytics est\u00e1 sendo usado em v\u00e1rios setores verticais para obter insights rapidamente - an\u00e1lise ad-hoc por um provedor de pagamento, an\u00e1lise de carrinho de compras por um varejista eletr\u00f4nico, mecanismo de reserva de passagens de \u00faltima gera\u00e7\u00e3o por uma companhia a\u00e9rea global, movimento em tempo real de carrinhos de comida dentro de um est\u00e1dio de beisebol \u00e0 medida que os f\u00e3s o enchem - e muito mais.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Na vers\u00e3o inicial, um dos objetivos do projeto do sistema era a disponibilidade do servi\u00e7o Analytics para executar consultas mesmo quando opera\u00e7\u00f5es de reequil\u00edbrio, failover ou revers\u00e3o estivessem sendo realizadas em um cluster. Como resultado, o servi\u00e7o Analytics retornaria os resultados da consulta mesmo quando os dados estivessem sendo movidos ou reparticionados. Esse design foi adaptado para a produtividade do desenvolvedor e permitiu que as equipes de DevOps reequilibrassem, fizessem failover ou revertessem de forma independente um cluster do Couchbase.<\/span><\/p>\n<p><span style=\"font-weight: 400\">\u00c0 medida que os clientes implementam o Analytics na produ\u00e7\u00e3o, uma solicita\u00e7\u00e3o comum \u00e9 garantir que n\u00e3o sejam retornados resultados n\u00e3o monot\u00f4nicos. Comportamento n\u00e3o monot\u00f4nico \u00e9 quando uma consulta avaliada em um determinado momento C retorna um resultado que era atual no momento A, um ponto muito anterior no tempo, com consultas intermedi\u00e1rias que retornaram resultados mais recentes. A figura abaixo ilustra o conceito.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-7283 size-large\" src=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2019\/07\/image2-1024x572.png\" alt=\"\" width=\"900\" height=\"503\" srcset=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2-1024x572.png 1024w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2-300x168.png 300w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2-768x429.png 768w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2-1536x858.png 1536w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2-20x11.png 20w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2-1320x738.png 1320w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image2.png 1999w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/p>\n<p><span style=\"font-weight: 400\">Isso \u00e9 especialmente verdadeiro para clientes que executam aplicativos cr\u00edticos para os neg\u00f3cios no Couchbase, como gastos do consumidor, vendas por trimestre, itens no carrinho de compras, invent\u00e1rio etc. Os clientes n\u00e3o querem que os relat\u00f3rios, os pain\u00e9is, as an\u00e1lises e, consequentemente, os insights sejam afetados pelas opera\u00e7\u00f5es do cluster durante a execu\u00e7\u00e3o desses aplicativos essenciais aos neg\u00f3cios.<\/span><span style=\"font-weight: 400\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">Para garantir que as consultas futuras s\u00f3 retornem quando a ingest\u00e3o de dados no Analytics voltar ao estado em que as consultas foram executadas anteriormente, estamos introduzindo a \"consist\u00eancia de varredura\" na pr\u00f3xima vers\u00e3o.\u00a0<\/span><\/p>\n<p><b>A consist\u00eancia da varredura refere-se ao fato de que os dados no servi\u00e7o Analytics s\u00e3o consistentes com o estado dos dados no servi\u00e7o de dados.\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400\">O objetivo da consist\u00eancia da varredura \u00e9 evitar o comportamento n\u00e3o monot\u00f4nico, n\u00e3o retornando os resultados da consulta antes que um estado anteriormente v\u00e1lido seja alcan\u00e7ado novamente.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Para fazer isso, basta definir as prefer\u00eancias apropriadas no query workbench. Anexei uma captura de tela abaixo com a prefer\u00eancia \"scan consistency\" definida como uma das seguintes:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">not_bounded<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">request_plus<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-7284 size-large\" src=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2019\/07\/image1-1024x173.png\" alt=\"\" width=\"900\" height=\"152\" srcset=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image1-1024x173.png 1024w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image1-300x51.png 300w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image1-768x130.png 768w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image1-20x3.png 20w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2019\/07\/image1.png 1136w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/p>\n<p><b>not_bounded (padr\u00e3o):<\/b><\/p>\n<p><span style=\"font-weight: 400\">Semelhante ao comportamento na vers\u00e3o 6.0, a consulta ser\u00e1 avaliada imediatamente com base nos dados atuais que foram ingeridos (ou reingressados no caso de uma revers\u00e3o significativa).<\/span><\/p>\n<p><b>request_plus:<\/b><\/p>\n<p><span style=\"font-weight: 400\">Antes de executar a consulta, os conjuntos de dados necess\u00e1rios para responder \u00e0 consulta ser\u00e3o identificados e o Analytics recuperar\u00e1 o estado atual dos compartimentos dos n\u00f3s de dados que alimentam esses conjuntos de dados. A consulta n\u00e3o ser\u00e1 executada at\u00e9 que os conjuntos de dados tenham ingerido todos os dados at\u00e9 o estado do bucket quando a solicita\u00e7\u00e3o de consulta foi recebida.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">Opcionalmente, voc\u00ea tamb\u00e9m pode especificar o tempo de espera antes do tempo limite de uma consulta usando a op\u00e7\u00e3o \"<\/span><b>scan_wait\"<\/b><span style=\"font-weight: 400\"> par\u00e2metro.<\/span><span style=\"font-weight: 400\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">A <\/span><b>request_plus<\/b><span style=\"font-weight: 400\"> com uma consulta <\/span><b>scan_wait<\/b><span style=\"font-weight: 400\"> ter\u00e1 um tempo limite se o n\u00edvel solicitado de consist\u00eancia da varredura n\u00e3o for alcan\u00e7ado dentro do tempo especificado.\u00a0<\/span><\/p>\n<p class=\"x_MsoNormal\"><b>Recursos<\/b><\/p>\n<p class=\"x_MsoNormal\"><i>Baixar<\/i><\/p>\n<p class=\"x_MsoNormal\"><a id=\"LPlnk261688\" class=\"OWAAutoLink\" title=\"https:\/\/couchbase.com\/downloads?family=server&amp;product=couchbase-server-developer\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/downloads\/?family=server&amp;product=couchbase-server-developer\">Fa\u00e7a o download do Couchbase Server 6.5<\/a><\/p>\n<p class=\"x_MsoNormal\"><i>Documenta\u00e7\u00e3o<\/i><\/p>\n<p class=\"x_MsoNormal\"><a id=\"LPlnk256262\" class=\"OWAAutoLink\" title=\"https:\/\/docs.couchbase.com\/server\/6.5\/release-notes\/relnotes.html\" href=\"https:\/\/docs.couchbase.com\/server\/6.5\/release-notes\/relnotes.html\">Notas de vers\u00e3o do Couchbase Server 6.5<\/a><\/p>\n<p class=\"x_MsoNormal\"><a id=\"LPlnk718575\" class=\"OWAAutoLink\" title=\"https:\/\/docs.couchbase.com\/server\/6.5\/introduction\/whats-new.html\" href=\"https:\/\/docs.couchbase.com\/server\/6.5\/introduction\/whats-new.html\">Couchbase Server 6.5 O que h\u00e1 de novo<\/a><\/p>\n<p class=\"x_MsoNormal\"><i>Blogs <\/i><\/p>\n<p class=\"x_MsoNormal\"><a id=\"LPlnk351663\" class=\"OWAAutoLink\" title=\"https:\/\/www.couchbase.com\/blog\/announcing-couchbase-server-6-5-0-beta-whats-new-and-improved\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/announcing-couchbase-server-6-5-0-whats-new-and-improved\/\">Blog: Anunciando o Couchbase Server 6.5 - O que h\u00e1 de novo e aprimorado<\/a><\/p>\n<p class=\"x_MsoNormal\"><a id=\"LPlnk446864\" class=\"OWAAutoLink\" title=\"https:\/\/www.couchbase.com\/blog\/couchbase-brings-distributed-multi-document-acid-transactions-to-nosql\/\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/couchbase-brings-distributed-multi-document-acid-transactions-to-nosql\/\">Blog: O Couchbase traz as transa\u00e7\u00f5es ACID multi-documento distribu\u00eddas para o NoSQL<\/a><\/p>\n<p class=\"x_MsoNormal\"><b><a id=\"LPlnk699665\" class=\"OWAAutoLink\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/tag\/6-5\/\">Todos os blogs 6.5<\/a><\/b><\/p>","protected":false},"excerpt":{"rendered":"<p>Since the GA back in Nov 2018, Couchbase Analytics is being used in multiple verticals for rapid time to insight \u2013 ad-hoc analysis by a payment provider,\u00a0 shopping cart analysis by an e-tailer, next gen ticket booking engine by a [&hellip;]<\/p>","protected":false},"author":559,"featured_media":7482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2294,1821,1816,1812],"tags":[2378,2345,1829,2304,2015],"ppma_author":[9052],"class_list":["post-7282","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics","category-couchbase-architecture","category-couchbase-server","category-n1ql-query","tag-6-5","tag-analyst-report","tag-bi","tag-reporting","tag-scan-consistency"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.8 (Yoast SEO v25.8) - 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