{"id":100516,"date":"2021-06-14T16:22:58","date_gmt":"2021-06-14T14:22:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-rqlite-6-0-raspredelyonnoj-otkazoustojchivoj-subd-na-osnove-sqlite"},"modified":"2021-06-14T16:22:58","modified_gmt":"2021-06-14T14:22:58","slug":"vypusk-rqlite-6-0-raspredelyonnoj-otkazoustojchivoj-subd-na-osnove-sqlite","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/vypusk-rqlite-6-0-raspredelyonnoj-otkazoustojchivoj-subd-na-osnove-sqlite","title":{"rendered":"Wydanie rqlite 6.0, rozproszonej, odpornie dzia\u0142aj\u0105cej bazy danych na bazie SQLite","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Zosta\u0142a wydana wersja rozproszonej bazy danych rqlite 6.0, kt\u00f3ra wykorzystuje SQLite jako silnik przechowywania i umo\u017cliwia organizacj\u0119 pracy klastra z synchronizowanymi magazynami. W\u015br\u00f3d cech rqlite wyr\u00f3\u017cnia si\u0119 \u0142atwo\u015b\u0107 instalacji, wdro\u017cenia i utrzymania rozproszonego systemu sk\u0142adowania o wysokiej dost\u0119pno\u015bci, por\u00f3wnywalnego z etcd i Consul, ale wykorzystuj\u0105cego relacyjn\u0105 model pracy z danymi zamiast formatu klucz\/warto\u015b\u0107. Kod projektu zosta\u0142 napisany w j\u0119zyku Go i jest udost\u0119pniany na licencji MIT.    <\/p>\n<p>Do utrzymania wszystkich w\u0119z\u0142\u00f3w w synchronizowanym stanie stosowany jest algorytm osi\u0105gania konsensusu Raft. Rqlite u\u017cywa oryginalnej biblioteki SQLite oraz standardowego sterownika go-sqlite3, na kt\u00f3rych dzia\u0142a warstwa przetwarzaj\u0105ca zapytania klient\u00f3w, realizuj\u0105ca replikacj\u0119 na inne w\u0119z\u0142y i monitoruj\u0105ca osi\u0105gni\u0119cie konsensusu dotycz\u0105cego wyboru lidera.     <\/p>\n<p>Zmiany w bazie danych mog\u0105 by\u0107 wprowadzane tylko przez w\u0119ze\u0142 wybrany jako lider, ale po\u0142\u0105czenia z operacjami zapisu mog\u0105 by\u0107 kierowane r\u00f3wnie\u017c do innych w\u0119z\u0142\u00f3w klastra, kt\u00f3re zwr\u00f3c\u0105 adres lidera w celu powt\u00f3rzenia zapytania (w nast\u0119pnej wersji obiecuj\u0105 doda\u0107 automatyczne przekazywanie zapyta\u0144 do lidera). G\u0142\u00f3wny nacisk k\u0142adzie si\u0119 na wysok\u0105 dost\u0119pno\u015b\u0107, dlatego system baz danych skaluje si\u0119 tylko przy operacjach odczytu, a operacje zapisu s\u0105 w\u0105skim gard\u0142em. Mo\u017cna uruchomi\u0107 klaster rqlite z jednego w\u0119z\u0142a, a to rozwi\u0105zanie mo\u017ce by\u0107 u\u017cywane do organizacji dost\u0119pu do SQLite przez HTTP bez zapewnienia dost\u0119pno\u015bci.      <\/p>\n<p>Dane SQLite na ka\u017cdym w\u0119\u017ale s\u0105 przechowywane nie w pliku, a w pami\u0119ci. Na poziomie warstwy implementuj\u0105cej protok\u00f3\u0142 Raft prowadzi si\u0119 log wszystkich komend SQLite, prowadz\u0105cych do zmian w bazie danych. Log ten jest wykorzystywany podczas replikacji (replikacja na poziomie odtwarzania zapyta\u0144 na innych w\u0119z\u0142ach), uruchamiania nowego w\u0119z\u0142a lub przywracania po utracie \u0142\u0105czno\u015bci. Aby zmniejszy\u0107 rozmiar logu, stosuje si\u0119 automatyczne pakowanie, kt\u00f3re uruchamia si\u0119 po okre\u015blonej liczbie zmian i prowadzi do zapisania na dysku zrzutu stanu, w odniesieniu do kt\u00f3rego zaczyna si\u0119 prowadzi\u0107 nowy log (stan bazy danych w pami\u0119ci jest identyczny ze zrzutem + nagromadzonym logiem zmian).     <\/p>\n<p>Cechy rqlite:  <\/p>\n<ul>\n<li class=\"l\"> \u0141atwo\u015b\u0107 wdra\u017cania klastra bez potrzeby osobnej instalacji SQLite.\n<li class=\"l\"> Mo\u017cliwo\u015b\u0107 szybkiego uzyskania replikowanej bazy danych SQL.\n<li class=\"l\"> Gotowo\u015b\u0107 do u\u017cycia w projektach roboczych (klasa produkcyjna).\n<li class=\"l\"> Dost\u0119p do API HTTP(S), kt\u00f3re pozwala na aktualizacj\u0119 danych w trybie wsadowym oraz okre\u015blenie wiod\u0105cego w\u0119z\u0142a klastra. Oferowany jest r\u00f3wnie\u017c interfejs wiersza polece\u0144 i mo\u017cliwo\u015b\u0107 korzystania z r\u00f3\u017cnych bibliotek klienckich stworzonych dla SQLite.\n<li class=\"l\"> Dost\u0119pno\u015b\u0107 us\u0142ugi do wykrywania innych w\u0119z\u0142\u00f3w, umo\u017cliwiaj\u0105cej dynamiczne tworzenie klastr\u00f3w.\n<li class=\"l\"> Wspieranie szyfrowania wymiany danych mi\u0119dzy w\u0119z\u0142ami.\n<li class=\"l\"> Mo\u017cliwo\u015b\u0107 konfigurowania poziomu sprawdzania aktualno\u015bci i sp\u00f3jno\u015bci danych podczas odczytu.\n<li class=\"l\"> Opcjonalna mo\u017cliwo\u015b\u0107 pod\u0142\u0105czania w\u0119z\u0142\u00f3w w trybie tylko do odczytu, kt\u00f3re nie bior\u0105 udzia\u0142u w ustalaniu konsensusu i s\u0105 u\u017cywane do zwi\u0119kszenia skalowalno\u015bci klastra w operacjach odczytu.\n<li class=\"l\"> Wsparcie dla w\u0142asnej formy transakcji na podstawie \u0142\u0105czenia polece\u0144 w jednym zapytaniu (transakcje oparte na BEGIN, COMMIT, ROLLBACK, SAVEPOINT i RELEASE nie s\u0105 wspierane).\n<li class=\"l\"> Wsparcie dla tworzenia gor\u0105cych kopii zapasowych.  <\/ul>\n<p>W nowej wersji wprowadzono znacz\u0105ce zmiany architektoniczne, maj\u0105ce na celu zwi\u0119kszenie niezawodno\u015bci klastra poprzez popraw\u0119 procesu kierowania zapyta\u0144 do odpowiednich w\u0119z\u0142\u00f3w klastra w przypadku odczytu i zapisu. W\u0119z\u0142y rqlite teraz mog\u0105 multiplexowa\u0107 mi\u0119dzy sob\u0105 kilka logicznych po\u0142\u0105cze\u0144, korzystaj\u0105c z po\u0142\u0105cze\u0144 TCP ustanowionych mi\u0119dzy w\u0119z\u0142ami protoko\u0142em Raft. Je\u015bli zapytanie wymaga uprawnie\u0144 wiod\u0105cego w\u0119z\u0142a, ale jest wysy\u0142ane do w\u0119z\u0142a podrz\u0119dnego, w\u0119ze\u0142 podrz\u0119dny mo\u017ce okre\u015bli\u0107 adres lidera i przekaza\u0107 go klientowi, bez przeprowadzania konsensusu w protokole Raft.    <\/p>\n<p>\u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u043b\u043e \u0438\u0437\u0431\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u043e\u0442 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0430 \u0434\u043b\u044f \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043c\u0435\u0442\u0430\u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0438\u0441\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u0443\u044e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u044f Raft \u0438 \u043c\u0435\u0442\u0430\u0434\u0430\u043d\u043d\u044b\u0445. \u0412\u0442\u043e\u0440\u0438\u0447\u043d\u044b\u0435 \u0443\u0437\u043b\u044b \u0442\u0435\u043f\u0435\u0440\u044c \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0442 \u0437\u0430\u043f\u0440\u043e\u0441\u044b \u043a \u0443\u0437\u043b\u0443-\u043b\u0438\u0434\u0435\u0440\u0443 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u0438, \u043a\u043e\u0433\u0434\u0430 \u043d\u0443\u0436\u043d\u043e \u0443\u0437\u043d\u0430\u0442\u044c \u0430\u0434\u0440\u0435\u0441 \u043b\u0438\u0434\u0438\u0440\u0443\u044e\u0449\u0435\u0433\u043e \u0443\u0437\u043b\u0430.  \u0412 API \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0443\u0437\u043b\u043e\u0432 \u0432 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0435. \u0412 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043a\u043e\u043c\u0430\u043d\u0434\u0430 &#171;.sysdump&#187;.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55326\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 rqlite 6.0, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 SQLite \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0434\u0432\u0438\u0436\u043a\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u0443 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430 \u0438\u0437 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043c\u0435\u0436\u0434\u0443 \u0441\u043e\u0431\u043e\u0439 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449. \u0418\u0437 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0435\u0439 rqlite \u043e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u043e\u0442\u0430 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438, \u0440\u0430\u0437\u0432\u0451\u0440\u0442\u044b\u0432\u0430\u043d\u0438\u044f \u0438 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0433\u043e \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430, \u0447\u0435\u043c-\u0442\u043e \u043f\u043e\u0445\u043e\u0436\u0435\u0433\u043e \u043d\u0430 etcd \u0438 Consul, \u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0435\u0433\u043e \u0440\u0435\u043b\u044f\u0446\u0438\u043e\u043d\u043d\u0443\u044e \u043c\u043e\u0434\u0435\u043b\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432\u043c\u0435\u0441\u0442\u043e \u0444\u043e\u0440\u043c\u0430\u0442\u0430 \u043a\u043b\u044e\u0447\/\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 [&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-100516","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 rqlite 6.0, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 SQLite \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 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