{"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\/sq\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Baza e t\u00eb dh\u00ebnave Apache Cassandra 4.0 \u00ebsht\u00eb n\u00eb dispozicion","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Organizata Apache Software Foundation paraqiti l\u00ebshimin e baz\u00ebs s\u00eb t\u00eb dh\u00ebnave t\u00eb shp\u00ebrndara Apache Cassandra 4.0, e cila i p\u00ebrket klas\u00ebs s\u00eb sistemeve noSQL dhe \u00ebsht\u00eb e dizajnuar p\u00ebr t\u00eb krijuar depo t\u00eb shkall\u00ebzuara dhe t\u00eb besueshme p\u00ebr grumbuj t\u00eb m\u00ebdhenj t\u00eb dh\u00ebnash, t\u00eb ruajtura si nj\u00eb tav\u00eb hash (asociative array). L\u00ebshimi i Cassandra 4.0 \u00ebsht\u00eb njohur si i gatsh\u00ebm p\u00ebr implementime n\u00eb pun\u00eb dhe \u00ebsht\u00eb testuar tashm\u00eb n\u00eb infrastrukturat e kompanive si Amazon, Apple, DataStax, Instaclustr, iland dhe Netflix me klaster\u00eb q\u00eb num\u00ebrojn\u00eb m\u00eb shum\u00eb se 1000 nyje. Kodi i projektit \u00ebsht\u00eb shkruar n\u00eb gjuh\u00ebn Java dhe shp\u00ebrndahet n\u00eb kuad\u00ebr t\u00eb licenc\u00ebs Apache 2.0.     <\/p>\n<p>Fillimisht, baza e t\u00eb dh\u00ebnave Cassandra u zhvillua nga Facebook dhe n\u00eb vitin 2009 iu dor\u00ebzua fondit Apache. Zgjidhjet industriale t\u00eb bazuara n\u00eb Cassandra jan\u00eb vendosur p\u00ebr t\u00eb siguruar funksionimin e sh\u00ebrbimeve t\u00eb kompanive si Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit dhe Twitter. P\u00ebr shembull, infrastruktura e ruajtjes e implementuar nga Apple bazuar n\u00eb Apache Cassandra p\u00ebrfshin m\u00eb shum\u00eb se nj\u00eb mij\u00eb klaster\u00eb, t\u00eb cilat p\u00ebrfshijn\u00eb 160 mij\u00eb nyje dhe ruajn\u00eb m\u00eb shum\u00eb se 100 petabajt t\u00eb dh\u00ebnash. Kompania Huawei p\u00ebrdor m\u00eb shum\u00eb se 300 klaster\u00eb t\u00eb Apache Cassandra, t\u00eb cilat p\u00ebrfshijn\u00eb 30 mij\u00eb nyje, nd\u00ebrsa n\u00eb Netflix ka m\u00eb shum\u00eb se 100 klaster\u00eb, q\u00eb mbulojn\u00eb 10 mij\u00eb nyje dhe p\u00ebrpunojn\u00eb m\u00eb shum\u00eb se nj\u00eb trilion k\u00ebrkesash n\u00eb dit\u00eb.     <\/p>\n<p>Baza e t\u00eb dh\u00ebnave Cassandra kombinon nj\u00eb sistem t\u00eb plot\u00eb t\u00eb distribuuar hash-Dynamo, i cili siguron praktikisht shkall\u00ebzim linear me rritjen e sasis\u00eb s\u00eb t\u00eb dh\u00ebnave. Cassandra p\u00ebrdor nj\u00eb model ruajtjeje t\u00eb t\u00eb dh\u00ebnave bazuar n\u00eb familjet e kolonave (ColumnFamily), i cili dallon nga sistemet t\u00eb ngjashme me memcachedb, t\u00eb cilat ruajn\u00eb t\u00eb dh\u00ebnat vet\u00ebm n\u00eb lidhje \u00e7el\u00ebs\/vler\u00eb, duke lejuar ruajtjen e hash-eve me disa nivele. P\u00ebr t\u00eb leht\u00ebsuar nd\u00ebrveprimin me baz\u00ebn e t\u00eb dh\u00ebnave, suporti p\u00ebr gjuh\u00ebn e formimit t\u00eb pyetjeve t\u00eb strukturuara CQL (Cassandra Query Language) \u00ebsht\u00eb n\u00eb dispozicion, e cila ngjason me SQL, por \u00ebsht\u00eb m\u00eb e kufizuar n\u00eb funksionalitet. Nga mund\u00ebsit\u00eb, mund t\u00eb p\u00ebrmendim suportin p\u00ebr hapsira emri dhe familje kolonash, krijimin e indekseve p\u00ebrmes shprehjes \"CREATE INDEX\".      <\/p>\n<p>Baza e t\u00eb dh\u00ebnave lejon krijimin e depozita t\u00eb q\u00ebndrueshme ndaj d\u00ebshtimeve: t\u00eb dh\u00ebnat e vendosura n\u00eb baz\u00ebn e t\u00eb dh\u00ebnave riplikohen automatikisht n\u00eb disa nyje t\u00eb rrjetit t\u00eb shp\u00ebrndar\u00eb, i cili mund t\u00eb mbuloj\u00eb zona t\u00eb ndryshme. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/kompaniya\/data-centers\/\"   title=\"qendra t\u00eb p\u00ebrpunimit t\u00eb t\u00eb dh\u00ebnave\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">qendra t\u00eb p\u00ebrpunimit t\u00eb t\u00eb dh\u00ebnave<\/a>. N\u00eb rast t\u00eb nj\u00eb d\u00ebshtimi t\u00eb nyj\u00ebs, funksionet e saj kapen n\u00eb fluks nga nyje t\u00eb tjera. Shtimi i nyjeve t\u00eb reja n\u00eb kluster dhe p\u00ebrdit\u00ebsimi i versionit t\u00eb Cassandra b\u00ebhet n\u00eb fluks, pa nd\u00ebrhyrje t\u00eb tjera manuale dhe riparime t\u00eb nyjeve t\u00eb tjera. T\u00eb drejtor\u00ebt me mb\u00ebshtetje p\u00ebr CQL jan\u00eb p\u00ebrgatitur p\u00ebr gjuh\u00ebt Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ dhe JavaScript (Node.js).        <\/p>\n<p>Novitetet kryesore:   <\/p>\n<ul>\n<li class=\"l\"> Rritet performanca dhe shkall\u00ebzueshm\u00ebria. \u00cbsht\u00eb rritur efikasiteti i shk\u00ebmbimit t\u00eb t\u00eb dh\u00ebnave n\u00eb formatin SSTable (Tabela e Fjal\u00ebve t\u00eb Renditur) midis nyjeve. Protokolli i shk\u00ebmbimit t\u00eb mesazheve midis nyjeve (Protokolli i Mesazheve Nd\u00ebrnyjesh) \u00ebsht\u00eb optimizuar. Shpejt\u00ebsia e transferimit t\u00eb rrjedhave t\u00eb t\u00eb dh\u00ebnave midis nyjeve \u00ebsht\u00eb rritur deri n\u00eb 5 her\u00eb (kryesisht p\u00ebr shkak t\u00eb p\u00ebrdorimit t\u00eb teknik\u00ebs Zero Copy dhe transferimit t\u00eb SSTable-ve n\u00eb t\u00ebr\u00ebsi), dhe kapaciteti p\u00ebr operacionet e leximit dhe shkrimit deri n\u00eb 25%. Procesi i rikuperimit t\u00eb inkrementuar \u00ebsht\u00eb optimizuar. Vonesat p\u00ebr shkak t\u00eb pezullimit t\u00eb ekzekutimit nga mbledh\u00ebsi i plehrave jan\u00eb reduktuar n\u00eb disa milisekonda.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mb\u00ebshtetje p\u00ebr regjistrin e auditi, i cili lejon t\u00eb ndiqen operacionet e autentifikimit t\u00eb p\u00ebrdoruesve dhe t\u00eb gjitha k\u00ebrkesat e kryera CQL.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mund\u00ebsia p\u00ebr t\u00eb mbajtur nj\u00eb regjist\u00ebr t\u00eb plot\u00eb binar t\u00eb k\u00ebrkesave, i cili lejon ruajtjen e gjith\u00eb trafikut t\u00eb k\u00ebrkesave dhe p\u00ebrgjigjeve. P\u00ebr menaxhim ofrohen komandat \"nodetool enablefullquerylog|disablefullquerylog|resetfullquerylog\", nd\u00ebrsa p\u00ebr analizimin e regjistrit p\u00ebrcillet utilitarja fqltool. Jan\u00eb ofruar komandat p\u00ebr t\u00eb transformuar regjistrin n\u00eb nj\u00eb format t\u00eb lexuesh\u00ebm (Dump), p\u00ebr krahasimin e aktiviteteve (Compare) dhe p\u00ebr p\u00ebrs\u00ebritjen (Replay) p\u00ebr analiz\u00eb duke rikrijuar kushte q\u00eb jan\u00eb t\u00eb pranishme n\u00eb ngarkes\u00ebn reale.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mb\u00ebshtetje p\u00ebr tabela virtuale, t\u00eb cilat pasqyrojn\u00eb jo t\u00eb dh\u00ebnat e ruajtura n\u00eb SSTable, por informacionin e nxjerr\u00eb p\u00ebrmes API-it (metrikat e performanc\u00ebs, informacion mbi konfigurimet, p\u00ebrmbajtjen e caches, t\u00eb dh\u00ebna mbi klient\u00ebt e lidhur etj.).\n<li class=\"l\"> \u00cbsht\u00eb rritur efikasiteti i ruajtjes s\u00eb t\u00eb dh\u00ebnave n\u00eb form\u00eb t\u00eb kompresuar, duke lejuar reduktimin e konsumit t\u00eb hap\u00ebsir\u00ebs s\u00eb diskut dhe rritjen e performanc\u00ebs s\u00eb operacioneve t\u00eb leximit.\n<li class=\"l\"> T\u00eb dh\u00ebnat q\u00eb i p\u00ebrkasin hap\u00ebsir\u00ebs s\u00eb \u00e7el\u00ebsit t\u00eb sistemit (system.*) tani vendosen p\u00ebr default n\u00eb direktorin\u00eb e par\u00eb n\u00eb vend q\u00eb t\u00eb shp\u00ebrndahen n\u00eb t\u00eb gjitha direktorit\u00eb me t\u00eb dh\u00ebna, duke lejuar ruajtjen e funksionalitetit t\u00eb nyj\u00ebs n\u00eb rast d\u00ebshtimi t\u00eb ndonj\u00eb prej disqeve shtes\u00eb.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mb\u00ebshtetje eksperimentale p\u00ebr replikimin transient dhe kuorumet e lehta. Replikat transient nuk ruajn\u00eb t\u00eb dh\u00ebna t\u00eb plota dhe p\u00ebrdorin rikuperimin inkremental p\u00ebr t\u00eb u harmonizuar me replikat e plota. Kuorumet e lehta zbatojn\u00eb optimizimin e operacioneve t\u00eb shkrimit, ku shkrimi n\u00eb replikat transient nuk b\u00ebhet derisa t\u00eb jet\u00eb n\u00eb dispozicion nj\u00eb grup i mjaftuesh\u00ebm i replikave t\u00eb plota.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mb\u00ebshtetje eksperimentale p\u00ebr Java 11.\n<li class=\"l\"> \u00cbsht\u00eb shtuar nj\u00eb mund\u00ebsi eksperimentale p\u00ebr krahasimin e t\u00eb gjitha pem\u00ebve Merkla. P\u00ebr shembull, aktivizimi i opsionit n\u00eb nj\u00eb klaster me 3 nyje, ku dy replikat jan\u00eb identike dhe nj\u00eb \u00ebsht\u00eb e vjetruar, do t\u00eb sjell\u00eb n\u00eb p\u00ebrfundimin e rinovimit t\u00eb replik\u00ebs s\u00eb vjetruar duke p\u00ebrdorur vet\u00ebm nj\u00eb operacion kopjimi t\u00eb replik\u00ebs aktuale.\n<li class=\"l\"> Jan\u00eb shtuar funksione t\u00eb reja currentTimestamp, currentDate, currentTime dhe currentTimeUUID.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mb\u00ebshtetje p\u00ebr operacionet aritmetike n\u00eb k\u00ebrkesat CQL.\n<li class=\"l\"> \u00cbsht\u00eb ofruar mund\u00ebsia p\u00ebr t\u00eb kryer operacione aritmetike midis t\u00eb dh\u00ebnave me tipet \"timestamp\"\/\"date\" dhe \"duration\".\n<li class=\"l\"> \u00cbsht\u00eb shtuar nj\u00eb modalitet p\u00ebr parashikimin e rrjedhave t\u00eb t\u00eb dh\u00ebnave t\u00eb nevojshme p\u00ebr rikuperim (nodetool repair \u2014preview) dhe mund\u00ebsia p\u00ebr t\u00eb kontrolluar integritetin e t\u00eb dh\u00ebnave q\u00eb po rikuperohen (nodetool repair \u2014validate).\n<li class=\"l\"> N\u00eb k\u00ebrkesat SELECT \u00ebsht\u00eb mund\u00ebsuar p\u00ebrpunimi i elementeve Map dhe Set.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mb\u00ebshtetje p\u00ebr paralelizimin e faz\u00ebs fillestare t\u00eb nd\u00ebrtimit t\u00eb shfaqjeve t\u00eb materializuara (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> N\u00eb ekipin &#171;nodetool cfstats&#187; \u00ebsht\u00eb shtuar mb\u00ebshtetje p\u00ebr renditjen sipas metrikave t\u00eb caktuara dhe kufizimin e numrit t\u00eb rreshtave t\u00eb shfaqura.\n<li class=\"l\"> Jan\u00eb ofruar cil\u00ebsime p\u00ebr kufizimin e lidhjes s\u00eb p\u00ebrdoruesit vet\u00ebm n\u00eb qendra t\u00eb dh\u00ebnash t\u00eb caktuara.\n<li class=\"l\"> \u00cbsht\u00eb shtuar mund\u00ebsia e kufizimit t\u00eb intensitetit (rate limit) t\u00eb operacioneve t\u00eb krijimit dhe pastrimit t\u00eb snapshot-eve.\n<li class=\"l\"> N\u00eb cqlsh dhe cqlshlib \u00ebsht\u00eb realizuar mb\u00ebshtetje p\u00ebr Python 3 (mb\u00ebshtetja p\u00ebr Python 2.7 akoma ruhet).\n<li class=\"l\"> \u00cbsht\u00eb ndalur mb\u00ebshtetja p\u00ebr platform\u00ebn Windows. P\u00ebr t\u00eb ekzekutuar Cassandra n\u00eb Windows, rekomandohet p\u00ebrdorimi i mjediseve Linux t\u00eb krijuar mbi n\u00ebn-sistemin WSL2 (Windows Subsystem for Linux 2) ose sistemet e virtualizimit.      <\/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=\"Luaj videon\" 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 \/>Burimi: <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 5.0.2 - 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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