{"id":100871,"date":"2021-07-29T16:23:28","date_gmt":"2021-07-29T14:23:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupna-subd-apache-cassandra-4-0"},"modified":"2021-07-29T16:23:28","modified_gmt":"2021-07-29T14:23:28","slug":"dostupna-subd-apache-cassandra-4-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"O SGBD Apache Cassandra 4.0 est\u00e1 dispon\u00edvel.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A organiza\u00e7\u00e3o Apache Software Foundation lan\u00e7ou a vers\u00e3o do banco de dados distribu\u00eddo Apache Cassandra 4.0, que pertence \u00e0 classe dos sistemas noSQL e foi projetada para criar armazenamentos altamente escal\u00e1veis e confi\u00e1veis de grandes volumes de dados, armazenados na forma de um array associativo (hash). O lan\u00e7amento do Cassandra 4.0 \u00e9 considerado pronto para implementa\u00e7\u00e3o em produ\u00e7\u00e3o e j\u00e1 foi testado em infraestruturas de empresas como Amazon, Apple, DataStax, Instaclustr, iland e Netflix com clusters que cont\u00eam mais de 1000 n\u00f3s. O c\u00f3digo do projeto \u00e9 escrito em Java e \u00e9 distribu\u00eddo sob a licen\u00e7a Apache 2.0.     <\/p>\n<p>Originalmente, o banco de dados Cassandra foi desenvolvido pela empresa Facebook e, em 2009, passou a ser administrado pela Apache Foundation. Solu\u00e7\u00f5es industriais baseadas em Cassandra foram implementadas para o funcionamento de servi\u00e7os de empresas como Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit e Twitter. Por exemplo, a infraestrutura de armazenamento da Apple baseada em Apache Cassandra conta com mais de mil clusters, incluindo 160 mil n\u00f3s e armazenando mais de 100 petabytes de dados. A Huawei utiliza mais de 300 clusters de Apache Cassandra, abrangendo 30 mil n\u00f3s, enquanto a Netflix opera com mais de 100 clusters, cobrindo 10 mil n\u00f3s e processando mais de um trilh\u00e3o de consultas por dia.     <\/p>\n<p>O banco de dados Cassandra combina um sistema de hash totalmente distribu\u00eddo chamado Dynamo, que proporciona escalabilidade quase linear com o aumento do volume de dados. Cassandra utiliza um modelo de armazenamento de dados baseado em fam\u00edlias de colunas (ColumnFamily), diferindo de sistemas como memcachedb, que armazenam dados apenas em pares chave\/valor, permitindo a organiza\u00e7\u00e3o de armazenamento de hashes com v\u00e1rios n\u00edveis de aninhamento. A intera\u00e7\u00e3o com o banco de dados \u00e9 facilitada atrav\u00e9s do CQL (Cassandra Query Language), uma linguagem de consulta que se assemelha ao SQL, mas com funcionalidades reduzidas. Entre os recursos, destacam-se o suporte a espa\u00e7os de nomes e fam\u00edlias de colunas, al\u00e9m da cria\u00e7\u00e3o de \u00edndices atrav\u00e9s da express\u00e3o 'CREATE INDEX'.      <\/p>\n<p>O banco de dados permite a cria\u00e7\u00e3o de armazenamentos resistentes a falhas: os dados inseridos no banco s\u00e3o automaticamente replicados em v\u00e1rios n\u00f3s de uma rede distribu\u00edda, que pode abranger diferentes <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/kompaniya\/data-centers\/\"   title=\"centros de dados\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">centros de dados<\/a>. Em caso de falha de um n\u00f3, suas fun\u00e7\u00f5es s\u00e3o assumidas por outros n\u00f3s em tempo real. A adi\u00e7\u00e3o de novos n\u00f3s ao cluster e a atualiza\u00e7\u00e3o da vers\u00e3o do Cassandra ocorrem sem interven\u00e7\u00e3o manual adicional e reconfigura\u00e7\u00e3o de outros n\u00f3s. Drivers com suporte a CQL est\u00e3o dispon\u00edveis para as linguagens Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ e JavaScript (Node.js).        <\/p>\n<p>Principais novidades:   <\/p>\n<ul>\n<li class=\"l\"> Aumentada a performance e escalabilidade. A efici\u00eancia na troca de dados no formato SSTable (Sorted Strings Table) entre os n\u00f3s foi aprimorada. O protocolo de troca de mensagens entre n\u00f3s (Internode Messaging Protocol) foi otimizado. A velocidade de transmiss\u00e3o de fluxos de dados entre os n\u00f3s aumentou em at\u00e9 5 vezes (principalmente devido \u00e0 aplica\u00e7\u00e3o da t\u00e9cnica Zero Copy e \u00e0 transfer\u00eancia de SSTables como um todo), e a largura de banda em opera\u00e7\u00f5es de leitura e grava\u00e7\u00e3o cresceu em at\u00e9 25%. O processo de recupera\u00e7\u00e3o incremental foi otimizado. Os atrasos devido \u00e0 pausa da execu\u00e7\u00e3o pelo coletor de lixo foram reduzidos para alguns milissegundos.\n<li class=\"l\"> Adicionada a suporte ao log de auditoria, permitindo rastrear opera\u00e7\u00f5es de autentica\u00e7\u00e3o de usu\u00e1rios e todas as requisi\u00e7\u00f5es CQL executadas.\n<li class=\"l\"> Foi adicionada a capacidade de manter um log bin\u00e1rio completo das consultas, permitindo a preserva\u00e7\u00e3o de todo o tr\u00e1fego de solicita\u00e7\u00f5es e respostas. Para gerenciamento, est\u00e3o dispon\u00edveis os comandos 'nodetool enablefullquerylog|disablefullquerylog|resetfullquerylog', e para an\u00e1lise do log, a ferramenta fqltool \u00e9 fornecida. Comandos est\u00e3o dispon\u00edveis para transformar o log em um formato leg\u00edvel (Dump), comparar cortes de atividade (Compare) e reexecutar (Replay) para an\u00e1lises sob condi\u00e7\u00f5es que simulam cargas reais.\n<li class=\"l\"> Adicionada a suporte a tabelas virtuais, que refletem n\u00e3o os dados armazenados em SSTables, mas informa\u00e7\u00f5es expostas atrav\u00e9s da API (m\u00e9tricas de desempenho, informa\u00e7\u00f5es de configura\u00e7\u00e3o, conte\u00fado de cache, dados sobre clientes conectados, etc.).\n<li class=\"l\"> A efici\u00eancia no armazenamento de dados em formato compactado foi aumentada, o que permite a redu\u00e7\u00e3o do consumo de espa\u00e7o em disco e melhora o desempenho das opera\u00e7\u00f5es de leitura.\n<li class=\"l\"> Os dados relacionados ao espa\u00e7o de chave do sistema (system.*) agora s\u00e3o colocados por padr\u00e3o no primeiro diret\u00f3rio em vez de serem distribu\u00eddos em todos os diret\u00f3rios com dados, o que permite manter a operabilidade do n\u00f3 em caso de falha de um dos discos adicionais.\n<li class=\"l\"> Foi adicionada a suporte experimental para replica\u00e7\u00e3o transit\u00f3ria (Transient Replication) e qu\u00f3runs leves (Cheap Quorums). R\u00e9plicas tempor\u00e1rias n\u00e3o armazenam todos os dados e utilizam recupera\u00e7\u00e3o incremental para se alinhar com r\u00e9plicas completas. Qu\u00f3runs leves implementam uma otimiza\u00e7\u00e3o de opera\u00e7\u00f5es de grava\u00e7\u00e3o onde a grava\u00e7\u00e3o em r\u00e9plicas tempor\u00e1rias n\u00e3o ocorre at\u00e9 que um conjunto suficiente de r\u00e9plicas completas esteja dispon\u00edvel.\n<li class=\"l\"> Foi adicionada a suporte experimental para Java 11.\n<li class=\"l\"> Foi adicionada uma op\u00e7\u00e3o experimental para comparar todas as \u00e1rvores Merkle (Merkle Tree). Por exemplo, ativar a op\u00e7\u00e3o em um cluster com 3 n\u00f3s, onde duas r\u00e9plicas s\u00e3o id\u00eanticas e uma est\u00e1 obsoleta, levar\u00e1 \u00e0 atualiza\u00e7\u00e3o da r\u00e9plica obsoleta usando apenas uma opera\u00e7\u00e3o de c\u00f3pia da r\u00e9plica atual.\n<li class=\"l\"> Novas fun\u00e7\u00f5es currentTimestamp, currentDate, currentTime e currentTimeUUID foram adicionadas.\n<li class=\"l\"> Foi adicionada a suporte para opera\u00e7\u00f5es aritm\u00e9ticas em consultas CQL.\n<li class=\"l\"> Foi adicionada a possibilidade de realizar opera\u00e7\u00f5es aritm\u00e9ticas entre dados dos tipos 'timestamp'\/'date' e 'duration'.\n<li class=\"l\"> Foi adicionado um modo para visualizar fluxos de dados necess\u00e1rios para recupera\u00e7\u00e3o (nodetool repair \u2014preview) e a op\u00e7\u00e3o de verificar a integridade dos dados recuperados (nodetool repair \u2014validate).\n<li class=\"l\"> Nas consultas SELECT, agora \u00e9 poss\u00edvel processar elementos Map e Set.\n<li class=\"l\"> Foi adicionada a suporte para paraleliza\u00e7\u00e3o da etapa de constru\u00e7\u00e3o inicial de vis\u00f5es materializadas (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> A equipe &#171;nodetool cfstats&#187; agora suporta a ordena\u00e7\u00e3o por m\u00e9tricas espec\u00edficas e limita o n\u00famero de linhas exibidas.\n<li class=\"l\"> Foram fornecidas configura\u00e7\u00f5es para restringir o acesso do usu\u00e1rio apenas a determinados data centers.\n<li class=\"l\"> Foi adicionada a possibilidade de limitar a intensidade (rate limit) das opera\u00e7\u00f5es de cria\u00e7\u00e3o e limpeza de snapshots.\n<li class=\"l\"> No cqlsh e cqlshlib, foi implementada a suporte para Python 3 (a suporte para Python 2.7 ainda \u00e9 mantida).\n<li class=\"l\"> A suporte para a plataforma Windows foi descontinuada. Para executar o Cassandra no Windows, \u00e9 recomend\u00e1vel usar ambientes Linux criados com base no Windows Subsystem for Linux 2 (WSL2) ou sistemas de virtualiza\u00e7\u00e3o.      <\/ul>\n<p>    <center>  <div class=\"youtube-placeholder\" data-id=\"kOf29M8qFts\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/kOf29M8qFts\/hqdefault.jpg\" alt=\"Por que no hosting comum a administra\u00e7\u00e3o do PrestaShop \u00e9 lenta, e no seu n\u00e3o \u00e9?\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div>  <\/center><br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55561\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u044f Apache Software Foundation \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 Apache Cassandra 4.0, \u043e\u0442\u043d\u043e\u0441\u044f\u0449\u0435\u0439\u0441\u044f \u043a \u043a\u043b\u0430\u0441\u0441\u0443 noSQL-\u0441\u0438\u0441\u0442\u0435\u043c \u0438 \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043d\u043d\u043e\u0439 \u043d\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0432\u044b\u0441\u043e\u043a\u043e\u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u0443\u0435\u043c\u044b\u0445 \u0438 \u043d\u0430\u0434\u0451\u0436\u043d\u044b\u0445 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449 \u043e\u0433\u0440\u043e\u043c\u043d\u044b\u0445 \u043c\u0430\u0441\u0441\u0438\u0432\u043e\u0432 \u0434\u0430\u043d\u043d\u044b\u0445, \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0445 \u0432 \u0444\u043e\u0440\u043c\u0435 \u0430\u0441\u0441\u043e\u0446\u0438\u0430\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u043c\u0430\u0441\u0441\u0438\u0432\u0430 (\u0445\u044d\u0448\u0430). \u0412\u044b\u043f\u0443\u0441\u043a Cassandra 4.0 \u043f\u0440\u0438\u0437\u043d\u0430\u043d \u0433\u043e\u0442\u043e\u0432\u044b\u043c \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u0432\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u0439 \u0438 \u0443\u0436\u0435 \u043f\u0440\u043e\u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d \u0432 \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430\u0445 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Amazon, Apple, DataStax, Instaclustr, iland \u0438 Netflix c \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430\u043c\u0438, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100871","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u044f Apache Software Foundation \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 Apache Cassandra 4.0, \u043e\u0442\u043d\u043e\u0441\u044f\u0449\u0435\u0439\u0441\u044f \u043a \u043a\u043b\u0430\u0441\u0441\u0443 noSQL-\u0441\u0438\u0441\u0442\u0435\u043c \u0438 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