{"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\/lv\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Pieejama datub\u0101ze Apache Cassandra 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Apache Software Foundation ir laidusi izplat\u012bto datub\u0101zi Apache Cassandra 4.0, kas pieder pie noSQL sist\u0113mu klases un ir paredz\u0113ta augsti m\u0113rogojamu un uzticamu milz\u012bgu datu apjomu glab\u0101\u0161anai asociat\u012bv\u0101 mas\u012bva (hash) form\u0101. Cassandra 4.0 izlai\u0161ana ir atz\u012bta par gatavu izmanto\u0161anai darb\u0101 un jau ir p\u0101rbaud\u012bta Amazon, Apple, DataStax, Instaclustr, iland un Netflix infrastrukt\u016br\u0101s ar klasteriem, kuros ir vair\u0101k nek\u0101 1000 mezglu. Projekta kods ir rakst\u012bts programm\u0113\u0161anas valod\u0101 Java un tiek izplat\u012bts saska\u0146\u0101 ar Apache 2.0 licenci.     <\/p>\n<p>S\u0101kotn\u0113ji datu b\u0101ze Cassandra tika izstr\u0101d\u0101ta uz\u0146\u0113mum\u0101 Facebook un 2009. gad\u0101 tika nodota Apache fonda pasp\u0101rn\u0113. R\u016bpnieciski risin\u0101jumi, balst\u012bti uz Cassandra, ir ieviesti, lai nodro\u0161in\u0101tu pakalpojumu darb\u012bbu t\u0101d\u0101m komp\u0101nij\u0101m k\u0101 Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit un Twitter. Piem\u0113ram, Apple izstr\u0101d\u0101t\u0101 infrastrukt\u016bra, kas balst\u0101s uz Apache Cassandra, aptver vair\u0101k nek\u0101 t\u016bkstoti klasteru, kas ietver 160 t\u016bksto\u0161us mezglu un uzglab\u0101 vair\u0101k nek\u0101 100 petabaitus datu. Uz\u0146\u0113mum\u0101 Huawei tiek izmantoti vair\u0101k nek\u0101 300 Apache Cassandra klasteru, kuros ir 30 t\u016bksto\u0161i mezglu, bet Netflix ir vair\u0101k nek\u0101 100 klasteru, kas aptver 10 t\u016bksto\u0161us mezglu un apstr\u0101d\u0101 vair\u0101k nek\u0101 triljonu piepras\u012bjumu dien\u0101.     <\/p>\n<p>Datu b\u0101ze Cassandra apvieno piln\u012bb\u0101 izklied\u0113tu hash sist\u0113mu Dynamo, kas nodro\u0161ina praktiski line\u0101ru m\u0113rogojam\u012bbu, palielinoties datu apjomam. Cassandra izmanto datu glab\u0101\u0161anas modeli, kas balst\u012bts uz kolonn\u0101m (ColumnFamily), at\u0161\u0137ir\u012bgu no sist\u0113m\u0101m, piem\u0113ram, memcachedb, kas uzglab\u0101 datus, izmantojot tikai atsl\u0113gu\/v\u0113rt\u012bbu p\u0101ri, \u013caujot organiz\u0113t nes\u0113ju ar vair\u0101kiem sl\u0101\u0146iem. Lai vienk\u0101r\u0161otu mijiedarb\u012bbu ar datu b\u0101zi, tiek atbalst\u012bts struktur\u0113tu vaic\u0101jumu veido\u0161anas valoda CQL (Cassandra Query Language), kas atg\u0101dina SQL, ta\u010du ir samazin\u0101ta funkcionalit\u0101te. No iesp\u0113j\u0101m var min\u0113t nosaukumu telpu un kolonnfamiliju atbalstu, indeksu izveidi, izmantojot izteiksmi \u201eCREATE INDEX\u201c.      <\/p>\n<p>Datub\u0101ze \u013cauj izveidot notur\u012bgas pret k\u013c\u016bd\u0101m glab\u0101\u0161anas sist\u0113mas: datu, kas tiek ievietoti datub\u0101z\u0113, autom\u0101tiska replik\u0101cija notiek uz vair\u0101kiem izplat\u012bt\u0101s t\u012bkla mezgliem, kas var aptvert da\u017e\u0101das <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/lv\/kompaniya\/data-centers\/\"   title=\"datu centru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">datu centru<\/a>. Ja mezgls izj\u016bk, t\u0101 funkcijas nekav\u0113joties uz\u0146em citi mezgli. Jaunu mezglu pievieno\u0161ana klasterim un Cassandra versijas atjaunin\u0101\u0161ana notiek autom\u0101tiski, neprasot papildu manu\u0101lu iejauk\u0161anos un citu mezglu p\u0101rkonfigur\u0101ciju. CQL atbalsto\u0161ie draiveri ir sagatavoti Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ un JavaScript (Node.js) valod\u0101m.        <\/p>\n<p>Galven\u0101s jaunin\u0101jumi:   <\/p>\n<ul>\n<li class=\"l\"> Uzlabota veiktsp\u0113ja un elast\u012bba. Uzlabota datu apmai\u0146as efektivit\u0101te SSTable (Sorted Strings Table) form\u0101t\u0101 starp mezgliem. Optimiz\u0113ts zi\u0146ojumu apmai\u0146as protokols starp mezgliem (Internode Messaging Protocol). Datu pl\u016bsmas p\u0101rs\u016bt\u012b\u0161anas \u0101trums starp mezgliem palielin\u0101jies l\u012bdz piec\u0101m reiz\u0113m (galvenok\u0101rt pateicoties Zero Copy tehnolo\u0123ijas izmanto\u0161anai un SSTables piln\u012bgas p\u0101rs\u016bt\u012b\u0161anas ietver\u0161anai), bet caurlaid\u012bba las\u012b\u0161anas un rakst\u012b\u0161anas oper\u0101cij\u0101s palielin\u0101jusies par 25%. Optimiz\u0113ts inkrement\u0101l\u0101 atjauno\u0161ana. Aizkav\u0113\u0161an\u0101s, kas saist\u012btas ar atkritumu sav\u0101c\u0113ja izpildes aptur\u0113\u0161anu, samazin\u0101tas l\u012bdz da\u017e\u0101m milisekund\u0113m.\n<li class=\"l\"> Pievienots atbalsts audit\u0101cijas \u017eurn\u0101lam, kas \u013cauj uzraudz\u012bt lietot\u0101ju autentifik\u0101cijas oper\u0101cijas un visus piepras\u012bjumus CQL.\n<li class=\"l\"> Pievienota iesp\u0113ja veikt piln\u012bgu bin\u0101ro vaic\u0101jumu \u017eurn\u0101lu, kas \u013cauj saglab\u0101t visu piepras\u012bjumu un atbil\u017eu trafiku. Lai p\u0101rvald\u012btu, tiek pied\u0101v\u0101tas komandas \u201enodetool enablefullquerylog|disablefullquerylog|resetfullquerylog\u201c, bet \u017eurn\u0101la anal\u012bzei tiek nodro\u0161in\u0101ta util\u012bta fqltool. Ir pieejamas komandas, lai \u017eurn\u0101lu p\u0101rv\u0113rstu las\u0101m\u0101 form\u0101t\u0101 (Dump), sal\u012bdzin\u0101tu aktivit\u0101tes griezumus (Compare) un atk\u0101rtoti izpild\u012btu (Replay), lai analiz\u0113tu ar re\u0101lo slodzi saist\u012bt\u0101s apst\u0101k\u013cus.\n<li class=\"l\"> Pievienots atbalsts virtu\u0101laj\u0101m tabul\u0101m, kas atspogu\u013co ne datus, kas glab\u0101jas SSTables, bet inform\u0101ciju, ko nodro\u0161ina API (veiktsp\u0113jas metri\u0137i, iestat\u012bjumu inform\u0101cija, ke\u0161atmi\u0146as saturs, inform\u0101cija par pievienotajiem klientiem utt.).\n<li class=\"l\"> Uzlabota datu glab\u0101\u0161anas efektivit\u0101te saspiest\u0101 veid\u0101, kas \u013cauj samazin\u0101t diskvietas pat\u0113ri\u0146u un uzlabot las\u012b\u0161anas oper\u0101ciju veiktsp\u0113ju.\n<li class=\"l\"> Dati, kas saist\u012bti ar sist\u0113mas atsl\u0113gu telpu (system.*), tagad p\u0113c noklus\u0113juma tiek novietoti pirmaj\u0101 direktorij\u0101, nevis izplat\u012bti vis\u0101s direktorij\u0101s ar datiem, kas \u013cauj saglab\u0101t mezgla darbsp\u0113ju, ja viens no papildu diskdzi\u0146iem iziet no ierindas.\n<li class=\"l\"> Ir ievesta eksperiment\u0101la atbalsta funkcionalit\u0101te laiku replik\u0101cijai (Transient Replication) un vieglaj\u0101m kvorumiem (Cheap Quorums). Pagaidu replikas nesaglab\u0101 visus datus un izmanto inkrement\u0101lo atjauno\u0161anu, lai saska\u0146otu ar piln\u012bgaj\u0101m replik\u0101m. Vieglie kvorumi realiz\u0113 rakst\u012b\u0161anas oper\u0101ciju optimiz\u0101ciju, kur\u0101 rakst\u012b\u0161ana uz pagaidu replik\u0101m netiek veikta, kam\u0113r nav pieejams pietiekams piln\u012bgu replikas komplekts.\n<li class=\"l\"> Ir ievesta eksperiment\u0101la atbalsta funkcionalit\u0101te Java 11.\n<li class=\"l\"> Ir pievienota eksperiment\u0101la opcija, lai sal\u012bdzin\u0101tu visas Merkle koka (Merkle Tree) strukt\u016bras. Piem\u0113ram, opcijas aktiviz\u0113\u0161ana klaster\u012b ar 3 mezgliem, kur divas replikas ir vien\u0101das, bet viena ir novecojusi, noved\u012bs pie novecojus\u012b replikas atjaunin\u0101\u0161anas, izmantojot tikai vienu aktu\u0101l\u0101s replikas kop\u0113\u0161anas oper\u0101ciju.\n<li class=\"l\"> Ir pievienotas jaunas funkcijas currentTimestamp, currentDate, currentTime un currentTimeUUID.\n<li class=\"l\"> Ir pievienots atbalsts aritm\u0113tisk\u0101m oper\u0101cij\u0101m CQL vaic\u0101jumos.\n<li class=\"l\"> Pied\u0101v\u0101ta iesp\u0113ja veikt aritm\u0113tiskas oper\u0101cijas starp datu tipiem \u201etimestamp\u201c\/\u201cdate\u201c un \u201eduration\u201c.\n<li class=\"l\"> Pievienots re\u017e\u012bms datu pl\u016bsmu priek\u0161skat\u012b\u0161anai, kas nepiecie\u0161amas atjauno\u0161anai (nodetool repair \u2014preview) un iesp\u0113ja p\u0101rbaud\u012bt atjaunoto datu integrit\u0101ti (nodetool repair \u2014validate).\n<li class=\"l\"> SELECT vaic\u0101jumos ir pievienota iesp\u0113ja apstr\u0101d\u0101t Map un Set elementus.\n<li class=\"l\"> Ir pievienots atbalsts paraleliz\u0101cijai materi\u0101lo skatu s\u0101kotn\u0113j\u0101 veido\u0161anas posm\u0101 (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> Komand\u0101 &#171;nodetool cfstats&#187; ir pievienota atbalsta iesp\u0113ja \u0161\u0137irot p\u0113c noteikt\u0101m metrisk\u0101m v\u0113rt\u012bb\u0101m un ierobe\u017eot izvietoto rindu skaitu.\n<li class=\"l\"> Ir nodro\u0161in\u0101ti iestat\u012bjumi, lai ierobe\u017eotu lietot\u0101ja piek\u013cuvi tikai noteiktiem datu centriem.\n<li class=\"l\"> Ir pievienota iesp\u0113ja ierobe\u017eot intensit\u0101ti (rate limit) oper\u0101ciju rad\u012b\u0161anai un atjauno\u0161anai.\n<li class=\"l\"> Cqlsh un cqlshlib ir ieviests atbalsts Python 3 (atbalsts Python 2.7 pagaid\u0101m ir saglab\u0101ts).\n<li class=\"l\"> Atbalsts Windows platformai ir p\u0101rtraukts. Lai palaistu Cassandra Windows vid\u0113, ieteicams izmantot Linux vidi, kas izveidota uz WSL2 (Windows Subsystem for Linux 2) vai virtualiz\u0101cijas sist\u0113m\u0101m.      <\/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=\"Atska\u0146ot video\" 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 \/>Avots: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55561\">opennet.lv<\/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 5.0.5 - 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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