{"id":73446,"date":"2020-03-09T20:41:59","date_gmt":"2020-03-09T17:41:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/pochemu-mozhet-ponadobitsya-polusinhronnaya-replikacziya"},"modified":"2020-03-09T20:41:59","modified_gmt":"2020-03-09T17:41:59","slug":"pochemu-mozhet-ponadobitsya-polusinhronnaya-replikacziya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/pochemu-mozhet-ponadobitsya-polusinhronnaya-replikacziya","title":{"rendered":"Pse mund t\u00eb nevojitet replikimi gjysm\u00eb-sinkron?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><i>P\u00ebrsh\u00ebndetje t\u00eb gjith\u00ebve. Jam Vladislav Rodin. Aktualisht po jap leksione n\u00eb portalin OTUS p\u00ebr kurset q\u00eb i kushtohen arkitektur\u00ebs s\u00eb software dhe arkitektur\u00ebs s\u00eb software q\u00eb p\u00ebrballon ngarkesa t\u00eb larta. <b>Para fillimit t\u00eb nj\u00eb grupi t\u00eb ri kursi <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/jvDY\/\">\u00abArkitekt i ngarkesave t\u00eb larta\u00bb<\/a><\/noindex> vendosa t\u00eb shkruaj nj\u00eb material t\u00eb vog\u00ebl autor\u00ebsor, t\u00eb cilin d\u00ebshiroj ta ndaj me ju.<\/b><\/i><\/p>\n<p><img decoding=\"async\" alt=\"Pse mund t\u00eb nevojitet replikimi gjysm\u00eb-sinkron?\" src=\"\/wp-content\/uploads\/2020\/03\/c2a1ea514249f8fca1ab9f668a899981.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>Hyrje<\/h2>\n<p>\nP\u00ebr shkak se n\u00eb HDD mund t\u00eb kryhen vet\u00ebm rreth 400-700 operacione n\u00eb sekond\u00eb (\u00e7ka nuk mund t\u00eb krahasohet me rps-tipiket q\u00eb i p\u00ebrkasin nj\u00eb sistemi me ngarkes\u00eb t\u00eb lart\u00eb), nj\u00eb baz\u00eb t\u00eb dh\u00ebnash klasike disk \u00ebsht\u00eb nj\u00eb ngushtic\u00eb e arkitektur\u00ebs. Prandaj \u00ebsht\u00eb e nevojshme t\u00eb kushtohet v\u00ebmendje e ve\u00e7ant\u00eb modeleve t\u00eb shkall\u00ebzimit t\u00eb k\u00ebtij depoziti.<\/p>\n<p>Aktualisht ekzistojn\u00eb 2 modele zgjerimi t\u00eb baz\u00ebs: replikimi dhe shardimi. Shardimi lejon zgjerimin e operacionit t\u00eb shkruar, dhe, si pasoj\u00eb, redukton rps p\u00ebr shkruar q\u00eb i takon nj\u00eb serveri t\u00eb klasit tuaj. Replikimi lejon t\u00eb b\u00ebhet e nj\u00ebjta gj\u00eb, por me operacionet e leximit. Ky model i dedikohet pik\u00ebrisht k\u00ebtij artikulli.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Replikimi<\/h2>\n<p>\nN\u00ebse e shikoni replikimin nga nj\u00eb k\u00ebndv\u00ebshtrim t\u00eb thjesht\u00eb, \u00ebsht\u00eb nj\u00eb gj\u00eb e leht\u00eb: keni pasur nj\u00eb server, n\u00eb t\u00eb cilin ndodheshin t\u00eb dh\u00ebnat, dhe m\u00eb pas ky server nuk kishte kapacitet t\u00eb p\u00ebrballonte ngarkes\u00ebn e leximit t\u00eb k\u00ebtyre t\u00eb dh\u00ebnave. Shtoni disa server\u00eb t\u00eb tjer\u00eb, sinkronizoni t\u00eb dh\u00ebnat n\u00eb t\u00eb gjitha serverat, dhe p\u00ebrdoruesi mund t\u00eb lexoj\u00eb nga \u00e7do server t\u00eb klasit tuaj. <\/p>\n<p>Megjith\u00ebse duket e thjesht\u00eb, ekzistojn\u00eb disa variante klasifikimi t\u00eb zbatimeve t\u00eb ndryshme t\u00eb k\u00ebsaj skeme:<\/p>\n<ul>\n<li>P\u00ebr rolet n\u00eb klas\u00eb (master-master ose master-slave)<\/li>\n<li>P\u00ebr objektet q\u00eb d\u00ebrgohen (row-based, statement-based ose mixed)<\/li>\n<li>P\u00ebr mekanizmin e sinkronizimit t\u00eb nodeve<\/li>\n<\/ul>\n<p>\nSot do t\u00eb shqyrtojm\u00eb pik\u00ebn e tret\u00eb. <\/p>\n<h2>Si ndodh komitimi i transaksionit<\/h2>\n<p>\nKy tem\u00eb nuk i p\u00ebrket drejtp\u00ebrdrejt replikimit, p\u00ebr t\u00eb cil\u00ebn mund t\u00eb shkruhet nj\u00eb artikull i ve\u00e7ant\u00eb, megjithat\u00eb, duke qen\u00eb se pa kuptimin e mekanizmit t\u00eb komitimit t\u00eb transaksionit, leximi i m\u00ebtejsh\u00ebm \u00ebsht\u00eb i padobish\u00ebm, lejoni t\u00eb p\u00ebrmendim gj\u00ebrat m\u00eb themelore. Komitimi i transaksionit ndodh n\u00eb 3 etapa:<\/p>\n<ol>\n<li>Sh\u00ebnimi i transaksionit n\u00eb jurnal t\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>P\u00ebrzgjedhja e transaksionit n\u00eb motorin e baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>Kthimi i konfirmimit p\u00ebr klientin p\u00ebr p\u00ebrzgjedhjen e suksesshme t\u00eb transaksionit.<\/li>\n<\/ol>\n<p>\nN\u00eb baza t\u00eb ndryshme n\u00eb k\u00ebt\u00eb algorit\u00ebm mund t\u00eb lindin nuanca: p\u00ebr shembull, n\u00eb motorin InnoDB t\u00eb baz\u00ebs MySQL ekzistojn\u00eb 2 revista: nj\u00eb p\u00ebr replikimin (binary log), dhe tjetra p\u00ebr mbajtjen e ACID (undo\/redolog), nd\u00ebrsa n\u00eb PostgreSQL ekziston nj\u00eb revist\u00eb q\u00eb kryen t\u00eb dyja funksionet (write ahead log = WAL). Por, e paraqitur m\u00eb lart \u00ebsht\u00eb pik\u00ebrisht koncepti i p\u00ebrgjithsh\u00ebm, q\u00eb lejon t\u00eb injorohen k\u00ebto nuanca.<\/p>\n<h2>Replikimi sinhron (sync)<\/h2>\n<p>\nLe t\u00eb shtojm\u00eb n\u00eb algoritmin e komitimit t\u00eb transaksionit logjik\u00ebn p\u00ebr replikimin e ndryshimeve t\u00eb marra:<\/p>\n<ol>\n<li>Sh\u00ebnimi i transaksionit n\u00eb jurnal t\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>P\u00ebrzgjedhja e transaksionit n\u00eb motorin e baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li><b>D\u00ebrgimi i t\u00eb dh\u00ebnave n\u00eb t\u00eb gjitha replikat.<\/b><\/li>\n<li><b>Marrja e konfirmimit nga t\u00eb gjitha replikat p\u00ebr p\u00ebrmbushjen e transaksionit.<\/b><\/li>\n<li>Kthimi i konfirmimit p\u00ebr klientin p\u00ebr p\u00ebrzgjedhjen e suksesshme t\u00eb transaksionit.<\/li>\n<\/ol>\n<p>\nN\u00eb k\u00ebt\u00eb qasje, ne hasim disa disavantazhe: <\/p>\n<ul>\n<li>klienti pret aplikimin e ndryshimeve n\u00eb t\u00eb gjitha replikat.<\/li>\n<li>me rritjen e numrit t\u00eb nodeve n\u00eb klas\u00eb, ne zvog\u00eblojm\u00eb probabilitetin q\u00eb operacioni i shkruar t\u00eb kaloj\u00eb me sukses.<\/li>\n<\/ul>\n<p>\nN\u00ebse p\u00ebr pik\u00ebn e par\u00eb gjith\u00e7ka \u00ebsht\u00eb m\u00ebse e qart\u00eb, arsyet p\u00ebr pik\u00ebn e dyt\u00eb k\u00ebrkojn\u00eb shpjegim. N\u00ebse gjat\u00eb replikimit sinhron ne nuk marrim p\u00ebrgjigje nga t\u00eb pakt\u00ebn nj\u00eb nod, ne rrokim transaksionin. N\u00eb k\u00ebt\u00eb m\u00ebnyr\u00eb, duke rritur numrin e nodeve n\u00eb klas\u00eb, rrisni probabilitetin q\u00eb operacioni i shkruajtur t\u00eb d\u00ebshtoj\u00eb. <\/p>\n<p>A mund t\u00eb presim konfirmimin vet\u00ebm nga nj\u00eb pjes\u00eb e nodeve, p\u00ebr shembull, nga 51% (quorum)? Po, mundemi, megjithat\u00eb, n\u00eb variantin klasik k\u00ebrkohet konfirmimi nga t\u00eb gjitha nodet, sepse vet\u00ebm k\u00ebshtu mund t\u00eb sigurojm\u00eb konsistenc\u00ebn e plot\u00eb t\u00eb t\u00eb dh\u00ebnave n\u00eb klas\u00eb, q\u00eb \u00ebsht\u00eb nj\u00eb avantazh i padiskutuesh\u00ebm i k\u00ebtij lloji t\u00eb replikimit.<\/p>\n<h2>Replikimi asinkron (async)<\/h2>\n<p>\nLe t\u00eb modifikojm\u00eb algoritmin e m\u00ebparsh\u00ebm. T\u00eb dh\u00ebnat n\u00eb replikat do t\u00eb d\u00ebrgohen \"kur t\u00eb vij\u00eb koha\", dhe \"kur t\u00eb vij\u00eb koha\" ndryshimet do t\u00eb zbatohen nga replikat:<\/p>\n<ol>\n<li>Sh\u00ebnimi i transaksionit n\u00eb jurnal t\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>P\u00ebrzgjedhja e transaksionit n\u00eb motorin e baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>Kthimi i konfirmimit p\u00ebr klientin p\u00ebr p\u00ebrzgjedhjen e suksesshme t\u00eb transaksionit.<\/li>\n<li><b>D\u00ebrgimi i t\u00eb dh\u00ebnave n\u00eb replikat dhe zbatimi i ndryshimeve nga ato.<\/b><\/li>\n<\/ol>\n<p>\nKjo qasje sjell q\u00eb klasa t\u00eb funksionoj\u00eb shpejt, sepse ne nuk e mbajm\u00eb klientin n\u00eb pritje derisa t\u00eb dh\u00ebnat t\u00eb arrijn\u00eb n\u00eb replikat dhe gjithashtu t\u00eb komitohen.<\/p>\n<p>Por kushti p\u00ebr d\u00ebrgimin e t\u00eb dh\u00ebnave n\u00eb replikat \"kur t\u00eb vij\u00eb koha\" mund t\u00eb \u00e7oj\u00eb n\u00eb humbje t\u00eb transaksioneve, duke p\u00ebrfshir\u00eb humbjen e nj\u00eb transaksioni t\u00eb konfirmuar nga p\u00ebrdoruesi, sepse n\u00ebse t\u00eb dh\u00ebnat nuk jan\u00eb kopjuar me koh\u00eb, konfirmimi p\u00ebr klientin p\u00ebr suksessh\u00ebm ekzekutimin e operacionit \u00ebsht\u00eb d\u00ebrguar, dhe n\u00eb nodin n\u00eb t\u00eb cilin kan\u00eb ardhur ndryshimet ka r\u00ebn\u00eb HDD, ne humbasim transaksionin, \u00e7ka mund t\u00eb sjell\u00eb pasojat shum\u00eb t\u00eb pak\u00ebndshme.<\/p>\n<h2>Replikimi gjysm\u00eb-sinhron (semisync)<\/h2>\n<p>\nFinalmente arrit\u00ebm te replikimi gjysm\u00eb-sinkron. Ky lloj replikimi nuk \u00ebsht\u00eb shum\u00eb i njohur dhe nuk \u00ebsht\u00eb shum\u00eb i zakonsh\u00ebm, por ai ngjall interes t\u00eb konsideruesh\u00ebm, pasi mund t\u00eb kombinoj\u00eb p\u00ebrfitimet e replikimit sinkron dhe asinkron.<\/p>\n<p>T\u00eb p\u00ebrpiqemi t\u00eb bashkohet dy qasjet e m\u00ebparshme. Nuk do ta mbajm\u00eb klientin shum\u00eb gjat\u00eb, por do t\u00eb k\u00ebrkojm\u00eb q\u00eb t\u00eb dh\u00ebnat t\u00eb replikohen:<\/p>\n<ol>\n<li>Sh\u00ebnimi i transaksionit n\u00eb jurnal t\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>P\u00ebrzgjedhja e transaksionit n\u00eb motorin e baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li><b>D\u00ebrgimi i t\u00eb dh\u00ebnave n\u00eb replika.<\/b><\/li>\n<li><b>Marrja e konfirmimit nga replika p\u00ebr marrjen e ndryshimeve (ato do t\u00eb aplikohen \u00abndonj\u00ebher\u00eb m\u00eb von\u00eb\u00bb).<\/b><\/li>\n<li>Kthimi i konfirmimit p\u00ebr klientin p\u00ebr p\u00ebrzgjedhjen e suksesshme t\u00eb transaksionit.<\/li>\n<\/ol>\n<p>\nVini re se me k\u00ebt\u00eb algorit\u00ebm humbja e transaksionit ndodh vet\u00ebm n\u00eb rast se d\u00ebshtojn\u00eb si nodi q\u00eb pranon ndryshimet, ashtu edhe nodi-replika. Probabiliteti i nj\u00eb d\u00ebshtimi t\u00eb till\u00eb pranohet si i vog\u00ebl, dhe k\u00ebto rreziqe pranohen. <\/p>\n<p>Por me k\u00ebt\u00eb qasje, ekziston rreziku i leximeve fantazm\u00eb. Imagjinoni skenarin e m\u00ebposht\u00ebm: n\u00eb hapin 4 nuk mor\u00ebm konfirmim nga asnj\u00eb replike. Ne duhet t\u00eb anulojm\u00eb k\u00ebt\u00eb transaksion dhe t\u00eb mos ia kthejm\u00eb konfirmimin klientit. Duke qen\u00eb se t\u00eb dh\u00ebnat u aplikuan n\u00eb hapin 2, midis p\u00ebrfundimit t\u00eb hapit 2 dhe anulimit t\u00eb transaksionit ndodhet nj\u00eb boshll\u00ebk temporal, gjat\u00eb s\u00eb cil\u00ebs transaksionet paralele mund t\u00eb shohin ato ndryshime q\u00eb nuk duhet t\u00eb ishin n\u00eb baz\u00ebn e t\u00eb dh\u00ebnave. <\/p>\n<h2>Replikimi Lose-less semisync<\/h2>\n<p>\nN\u00ebse mendojm\u00eb pak, mund t\u00eb korrigjojm\u00eb problemin e leximeve fantazm\u00eb n\u00eb k\u00ebt\u00eb skenar duke thjesht nd\u00ebrruar hapat e algoritmit:<\/p>\n<ol>\n<li>Sh\u00ebnimi i transaksionit n\u00eb jurnal t\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li><b>D\u00ebrgimi i t\u00eb dh\u00ebnave t\u00eb replikes.<\/b><\/li>\n<li><b>Marrja e konfirmimit nga replika p\u00ebr marrjen e ndryshimeve (ato do t\u00eb aplikohen \u00abndonj\u00ebher\u00eb m\u00eb von\u00eb\u00bb).<\/b><\/li>\n<li>P\u00ebrzgjedhja e transaksionit n\u00eb motorin e baz\u00ebs s\u00eb t\u00eb dh\u00ebnave.<\/li>\n<li>Kthimi i konfirmimit p\u00ebr klientin p\u00ebr p\u00ebrzgjedhjen e suksesshme t\u00eb transaksionit.<\/li>\n<\/ol>\n<p>\nTani ne komitojm\u00eb ndryshimet vet\u00ebm n\u00ebse ato jan\u00eb replikuar. <\/p>\n<h2>P\u00ebrfundim<\/h2>\n<p>\nSi gjithmon\u00eb, nuk ka zgjidhje ideale, ka nj\u00eb grup zgjidhjesh, secila prej t\u00eb cilave ka p\u00ebrfitimet dhe disavantazhet e veta dhe \u00ebsht\u00eb e p\u00ebrshtatshme p\u00ebr zgjidhjen e klasave t\u00eb ndryshme t\u00eb problemeve. Kjo \u00ebsht\u00eb krejt\u00ebsisht e v\u00ebrtet\u00eb edhe p\u00ebr zgjedhjen e mekanizmit t\u00eb sinkronizimit t\u00eb t\u00eb dh\u00ebnave t\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave t\u00eb replikuar. Grupi i p\u00ebrfitimeve q\u00eb ofron replikimi gjysm\u00eb-sinkron \u00ebsht\u00eb mjaft i r\u00ebnd\u00ebsish\u00ebm dhe interesant, p\u00ebr sa koh\u00eb q\u00eb mund t\u00eb konsiderohet t\u00eb vlej\u00eb v\u00ebmendje, pavar\u00ebsisht p\u00ebrhapjes s\u00eb saj t\u00eb vog\u00ebl.<\/p>\n<p><b>K\u00ebtu \u00ebsht\u00eb gjith\u00e7ka. Mirupafshim n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/jvDY\/\">kurs<\/a><\/noindex>!<\/b><br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/491106\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0441\u0435\u043c \u043f\u0440\u0438\u0432\u0435\u0442. \u041d\u0430 \u0441\u0432\u044f\u0437\u0438 \u0412\u043b\u0430\u0434\u0438\u0441\u043b\u0430\u0432 \u0420\u043e\u0434\u0438\u043d. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u044f \u043f\u0440\u0435\u043f\u043e\u0434\u0430\u044e \u043d\u0430 \u043f\u043e\u0440\u0442\u0430\u043b\u0435 OTUS \u043a\u0443\u0440\u0441\u044b, \u043f\u043e\u0441\u0432\u044f\u0449\u0435\u043d\u043d\u044b\u0435 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u041f\u041e \u0438 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u041f\u041e, \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0435. \u0412 \u043f\u0440\u0435\u0434\u0434\u0432\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0440\u0442\u0430 \u043d\u043e\u0432\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430 \u043a\u0443\u0440\u0441\u0430 \u00ab\u0410\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u043e\u0440 \u0432\u044b\u0441\u043e\u043a\u0438\u0445 \u043d\u0430\u0433\u0440\u0443\u0437\u043e\u043a\u00bb \u044f \u0440\u0435\u0448\u0438\u043b \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0430\u0432\u0442\u043e\u0440\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b, \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0445\u043e\u0447\u0443 \u043f\u043e\u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f \u0441 \u0432\u0430\u043c\u0438. \u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0418\u0437-\u0437\u0430 \u0442\u043e\u0433\u043e, \u0447\u0442\u043e \u043d\u0430 HDD \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c\u0441\u044f \u043b\u0438\u0448\u044c \u043f\u043e\u0440\u044f\u0434\u043a\u0430 400-700 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":73447,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-73446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u0441\u0435\u043c \u043f\u0440\u0438\u0432\u0435\u0442. \u041d\u0430 \u0441\u0432\u044f\u0437\u0438 \u0412\u043b\u0430\u0434\u0438\u0441\u043b\u0430\u0432 \u0420\u043e\u0434\u0438\u043d. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u044f \u043f\u0440\u0435\u043f\u043e\u0434\u0430\u044e \u043d\u0430 \u043f\u043e\u0440\u0442\u0430\u043b\u0435 OTUS \u043a\u0443\u0440\u0441\u044b, \u043f\u043e\u0441\u0432\u044f\u0449\u0435\u043d\u043d\u044b\u0435 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u041f\u041e \u0438 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u041f\u041e, \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0435.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/pochemu-mozhet-ponadobitsya-polusinhronnaya-replikacziya\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"sq_AL\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041f\u043e\u0447\u0435\u043c\u0443 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u043d\u0430\u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u043b\u0443\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0430\u044f \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u044f? 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