{"id":37709,"date":"2019-10-31T22:19:14","date_gmt":"2019-10-31T19:19:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/dostupen-dqlite-1-0-raspredelyonnyj-variant-sqlite-ot-kompanii-canonical\/"},"modified":"2019-10-31T22:19:14","modified_gmt":"2019-10-31T19:19:14","slug":"dostupen-dqlite-1-0-raspredelyonnyj-variant-sqlite-ot-kompanii-canonical","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupen-dqlite-1-0-raspredelyonnyj-variant-sqlite-ot-kompanii-canonical","title":{"rendered":"Dqlite 1.0 je nyn\u00ed k dispozici, distribuovan\u00e1 varianta SQLite od spole\u010dnosti Canonical","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Spole\u010dnost Canonical <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/canonical\/dqlite\/releases\/tag\/v1.0.0\">publikovala<\/a><\/noindex> v\u00fdznamn\u00e9 vyd\u00e1n\u00ed projektu <noindex><a rel=\"nofollow\" href=\"https:\/\/dqlite.io\/\">Dqlite 1.0<\/a><\/noindex> (Distributed SQLite), vyv\u00edjej\u00edc\u00ed kompatibiln\u00ed s SQLite vestav\u011bn\u00fd SQL engine, kter\u00fd podporuje replikaci dat, automatickou obnovu po hav\u00e1ri\u00edch a zaji\u0161t\u011bn\u00ed odolnosti proti chyb\u00e1m rozd\u011blen\u00edm zpracovatel\u016f na v\u00edce uzl\u016f. Syst\u00e9m spr\u00e1vy datab\u00e1z\u00ed je implementov\u00e1n jako knihovna C p\u0159ipojen\u00e1 k aplikac\u00edm a <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/canonical\/dqlite\">distribuov\u00e1no<\/a><\/noindex> pod licenc\u00ed Apache 2.0 (p\u016fvodn\u00ed SQLite je k dispozici jako ve\u0159ejn\u00e9 vlastnictv\u00ed). K dispozici jsou vazby pro jazyk <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/canonical\/go-dqlite\">Go<\/a><\/noindex>.<\/p>\n<p>Knihovna je nadstavbou nad st\u00e1vaj\u00edc\u00ed k\u00f3dovou z\u00e1kladnou SQLite, kter\u00e1 p\u0159id\u00e1v\u00e1 podporu s\u00ed\u0165ov\u00e9ho protokolu pro propojen\u00ed n\u011bkolika instanc\u00ed aplikace b\u011b\u017e\u00edc\u00edch na r\u016fzn\u00fdch hostitel\u00edch. Aplikace sestaven\u00e1 s Dqlite m\u016f\u017ee fungovat jako samostatn\u00fd odoln\u00fd cluster, nespol\u00e9haaj\u00edc\u00ed se na extern\u00ed syst\u00e9my spr\u00e1vy datab\u00e1z\u00ed. V praxi je Dqlite pou\u017e\u00edv\u00e1n spole\u010dnost\u00ed Canonical v syst\u00e9mu spr\u00e1vy kontejner\u016f <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44228\">LXD<\/a><\/noindex>. Mezi oblasti pou\u017eit\u00ed knihovny se tak\u00e9 zmi\u0148uje vytv\u00e1\u0159en\u00ed odoln\u00fdch za\u0159\u00edzen\u00ed internetu v\u011bc\u00ed a zpracovatel\u016f v syst\u00e9mech<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48372\">Edge<\/a><\/noindex><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51077\">-v\u00fdpo\u010dt\u016f<\/a><\/noindex>. <\/p>\n<p>Pro zaji\u0161t\u011bn\u00ed konzistence p\u0159i replikaci dat se pou\u017e\u00edv\u00e1 metoda dosa\u017een\u00ed konsensu na b\u00e1zi algoritmu  <noindex><a rel=\"nofollow\" href=\"https:\/\/raft.github.io\/\">Raft<\/a><\/noindex>, kter\u00fd je vyu\u017e\u00edv\u00e1n v projektech jako etcd, RethinkDB, CockroachDB a OpenDaylight. V Dqlite se pou\u017e\u00edv\u00e1 vlastn\u00ed asynchronn\u00ed implementace <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/canonical\/raft\">C-raft<\/a><\/noindex>, napsan\u00e1 v jazyce C. Pro multiplexaci zpracov\u00e1n\u00ed spojen\u00ed a organizaci spou\u0161t\u011bn\u00ed spolupracuj\u00edc\u00edch program\u016f se pou\u017e\u00edvaj\u00ed p\u0159ipraven\u00e9 knihovny <noindex><a rel=\"nofollow\" href=\"https:\/\/libuv.org\/\">libuv<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/canonical\/libco\">libco<\/a><\/noindex>.<\/p>\n<p>Ve srovn\u00e1n\u00ed s podobn\u00fdm projektem  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/rqlite\/rqlite\">rqlite<\/a><\/noindex>, Dqlite zaji\u0161\u0165uje plnou podporu transakc\u00ed, m\u016f\u017ee se propojit s jak\u00fdmikoli projekty v jazyce C, umo\u017e\u0148uje pou\u017eit\u00ed funkce time() a pou\u017e\u00edv\u00e1 replikaci na z\u00e1klad\u011b sn\u00edmk\u016f m\u00edsto replikace na z\u00e1klad\u011b p\u0159enosu SQL v\u00fdraz\u016f.<\/p>\n<p>Vlastnosti Dqlite:<\/p>\n<ul>\n<li class=\"l\"> Prov\u00e1d\u011bn\u00ed v\u0161ech diskov\u00fdch a s\u00ed\u0165ov\u00fdch operac\u00ed v asynchronn\u00edm re\u017eimu;\n<li class=\"l\"> Existence testovac\u00edho souboru pro potvrzen\u00ed spr\u00e1vnosti dat;\n<li class=\"l\"> N\u00edzk\u00e1 spot\u0159eba pam\u011bti a efektivn\u00ed v\u00fdm\u011bna dat po s\u00edti;\n<li class=\"l\"> Trval\u00e9 ukl\u00e1d\u00e1n\u00ed na disku DB a logu transakc\u00ed (s mo\u017enost\u00ed ukl\u00e1d\u00e1n\u00ed do pam\u011bti);\n<li class=\"l\"> Rychl\u00e1 obnova po hav\u00e1ri\u00edch;\n<li class=\"l\"> Stabiln\u00ed CLI klient v jazyce Go, kter\u00fd lze pou\u017e\u00edt k inicializaci DB, konfiguraci replikace a p\u0159ipojen\u00ed\/odpojen\u00ed uzl\u016f;\n<li class=\"l\"> Podpora architektur ARM, X86, POWER a IBM Z;\n<li class=\"l\"> Implementace algoritmu Raft byla optimalizov\u00e1na pro minimalizaci zpo\u017ed\u011bn\u00ed p\u0159i potvrzov\u00e1n\u00ed transakc\u00ed.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51402\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Canonical \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dqlite 1.0 (Distributed SQLite), \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u044b\u0439 \u0441 SQLite \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0439 SQL-\u0434\u0432\u0438\u0436\u043e\u043a, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0438\u0439 \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u044e \u0434\u0430\u043d\u043d\u044b\u0445, \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u0441\u043b\u0435 \u0441\u0431\u043e\u0435\u0432 \u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u0435 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u0447\u0435\u0440\u0435\u0437 \u0440\u0430\u0437\u043d\u0435\u0441\u0435\u043d\u0438\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0443\u0437\u043b\u043e\u0432. \u0421\u0423\u0411\u0414 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u0430 \u0432 \u0444\u043e\u0440\u043c\u0435 \u043f\u0440\u0438\u043a\u0440\u0435\u043f\u043b\u044f\u0435\u043c\u043e\u0439 \u043a \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u043c \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Apache 2.0 (\u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 SQLite \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0434\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435). \u0414\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u0431\u0438\u043d\u0434\u0438\u043d\u0433\u0438 \u0434\u043b\u044f [&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-37709","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=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Canonical \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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