{"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\/sk\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Dostupn\u00e1 SODB Apache Cassandra 4.0.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Organiz\u00e1cia Apache Software Foundation predstavila vydanie distribuovanej datab\u00e1zy Apache Cassandra 4.0, ktor\u00e1 patr\u00ed do triedy noSQL syst\u00e9mov a je ur\u010den\u00e1 na vytv\u00e1ranie vysoko \u0161k\u00e1lovate\u013en\u00fdch a spo\u013eahliv\u00fdch \u00falo\u017e\u00edsk obrovsk\u00fdch objemov \u00fadajov, uchov\u00e1van\u00fdch vo forme asociat\u00edvneho po\u013ea (hashu). Vydanie Cassandra 4.0 je pova\u017eovan\u00e9 za pripraven\u00e9 na prev\u00e1dzkov\u00e9 nasadenie a u\u017e bolo testovan\u00e9 v infra\u0161trukt\u00farach spolo\u010dnost\u00ed Amazon, Apple, DataStax, Instaclustr, iland a Netflix s klastrami, ktor\u00e9 obsahuj\u00fa viac ako 1000 uzlov. K\u00f3d projektu je nap\u00edsan\u00fd v jazyku Java a je distribuovan\u00fd v r\u00e1mci licencie Apache 2.0.     <\/p>\n<p>P\u00f4vodne bola datab\u00e1za Cassandra vyvinut\u00e1 spolo\u010dnos\u0165ou Facebook a v roku 2009 bola odovzdan\u00e1 do spr\u00e1vy nad\u00e1cie Apache. Priemyseln\u00e9 rie\u0161enia postaven\u00e9 na Cassandre s\u00fa nasaden\u00e9 na zabezpe\u010denie prev\u00e1dzky slu\u017eieb tak\u00fdch spolo\u010dnost\u00ed, ako s\u00fa Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit a Twitter. Napr\u00edklad infra\u0161trukt\u00fara ukladania, ktor\u00fa spolo\u010dnos\u0165 Apple nasadila na b\u00e1ze Apache Cassandry, m\u00e1 viac ako tis\u00edc klastrov, ktor\u00e9 obsahuj\u00fa 160 tis\u00edc uzlov a ukladaj\u00fa viac ne\u017e 100 petabajtov d\u00e1t. Spolo\u010dnos\u0165 Huawei pou\u017e\u00edva viac ako 300 klastrov Apache Cassandry, ktor\u00e9 obsahuj\u00fa 30 tis\u00edc uzlov, a v Netflixe sa nach\u00e1dza viac ako 100 klastrov zah\u0155\u0148aj\u00facich 10 tis\u00edc uzlov, ktor\u00e9 spracov\u00e1vaj\u00fa viac ne\u017e bili\u00f3n po\u017eiadaviek denne.     <\/p>\n<p>Datab\u00e1za Cassandra kombinuje \u00faplne distribuovan\u00fa hash-syst\u00e9m Dynamo, poskytuj\u00facu prakticky line\u00e1rnu \u0161k\u00e1lovate\u013enos\u0165 pri n\u00e1raste objemu d\u00e1t. Cassandra vyu\u017e\u00edva model ukladania d\u00e1t na b\u00e1ze rodinnej \u0161trukt\u00fary st\u013apcov (ColumnFamily), ktor\u00e1 sa od syst\u00e9mov ako memcachedb, ktor\u00e9 ukladaj\u00fa d\u00e1ta iba v p\u00e1roch k\u013e\u00fa\u010d\/hodnota, l\u00ed\u0161i mo\u017enos\u0165ou organizova\u0165 ukladanie hashov s nieko\u013ek\u00fdmi \u00farov\u0148ami vnorenia. Na zjednodu\u0161enie interakcie s datab\u00e1zou podporuje jazyk pre formulovanie \u0161trukt\u00farovan\u00fdch dotazov CQL (Cassandra Query Language), ktor\u00fd je podobn\u00fd SQL, ale je obmedzen\u00fd vo funk\u010dnosti. Medzi dostupn\u00e9 mo\u017enosti patr\u00ed podpora menov\u00fdch priestorov a rod\u00edn st\u013apcov, vytv\u00e1ranie indexov prostredn\u00edctvom pr\u00edkazu \u201eCREATE INDEX\u201c.      <\/p>\n<p>DBMS umo\u017e\u0148uje vytv\u00e1ra\u0165 odoln\u00e9 vo\u010di chyb\u00e1m \u00falo\u017eisk\u00e1: \u00fadaje umiestnen\u00e9 v datab\u00e1ze sa automaticky replikuj\u00fa na nieko\u013eko uzlov distribuovanej siete, ktor\u00e1 m\u00f4\u017ee pokr\u00fdva\u0165 r\u00f4zne <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sk\/kompaniya\/data-centers\/\"   title=\"d\u00e1tov\u00fdch centr\u00e1ch\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">d\u00e1tov\u00fdch centr\u00e1ch<\/a>. Pri poruche uzla sa jeho funkcie okam\u017eite preberaj\u00fa in\u00e9 uzly. Prid\u00e1vanie nov\u00fdch uzlov do klastru a aktualiz\u00e1cia verzie Cassandra sa vykon\u00e1va bez dodato\u010dn\u00e9ho manu\u00e1lneho z\u00e1sahu a rekonfigur\u00e1cie ostatn\u00fdch uzlov. Ovl\u00e1da\u010de s podporou CQL s\u00fa pripraven\u00e9 pre jazyky Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ a JavaScript (Node.js).        <\/p>\n<p>Hlavn\u00e9 novinky:   <\/p>\n<ul>\n<li class=\"l\"> Zv\u00fd\u0161en\u00fd v\u00fdkon a \u0161k\u00e1lovate\u013enos\u0165. Zlep\u0161en\u00e1 efektivita v\u00fdmeny d\u00e1t v SSTable (Sorted Strings Table) medzi uzlami. Optimalizovan\u00fd protokol v\u00fdmeny spr\u00e1v medzi uzlami (Internode Messaging Protocol). R\u00fdchlos\u0165 prenosu d\u00e1tov\u00fdch pr\u00fadov medzi uzlami vzr\u00e1stla a\u017e 5-kr\u00e1t (najm\u00e4 v\u010faka technike Zero Copy a pren\u00e1\u0161an\u00ed cel\u00fdch SSTables), a priepustnos\u0165 pri oper\u00e1ci\u00e1ch \u010d\u00edtania a z\u00e1pisu a\u017e 25%. Optimalizovan\u00fd proces inkrement\u00e1lneho obnovenia. Zdr\u017eania sp\u00f4soben\u00e9 pozastaven\u00edm vykon\u00e1vania zbiera\u010dom odpadu s\u00fa zn\u00ed\u017een\u00e9 na nieko\u013eko milisek\u00fand.\n<li class=\"l\"> Pridan\u00e1 podpora aud\u00edtorsk\u00e9ho denn\u00edka, ktor\u00fd umo\u017e\u0148uje sledova\u0165 oper\u00e1cie autentifik\u00e1cie pou\u017e\u00edvate\u013eov a v\u0161etky vykon\u00e1van\u00e9 dotazy CQL.\n<li class=\"l\"> Bola pridan\u00e1 mo\u017enos\u0165 vedenia \u00fapln\u00e9ho bin\u00e1rneho logu po\u017eiadaviek, ktor\u00fd umo\u017e\u0148uje uchov\u00e1va\u0165 cel\u00fd tok po\u017eiadaviek a odpoved\u00ed. Na spr\u00e1vu s\u00fa navrhnut\u00e9 pr\u00edkazy \u201enodetool enablefullquerylog|disablefullquerylog|resetfullquerylog\u201c, a pre anal\u00fdzu logu sa dod\u00e1va n\u00e1stroj fqltool. Poskytli sa pr\u00edkazy na transform\u00e1ciu logu do \u010ditate\u013enej podoby (Dump), porovn\u00e1vanie rezov aktivity (Compare) a op\u00e4tovn\u00e9 vykon\u00e1vanie (Replay) na anal\u00fdzu s obnoven\u00edm podmienok typick\u00fdch pre re\u00e1lnu z\u00e1\u0165a\u017e.\n<li class=\"l\"> Pridan\u00e1 podpora virtu\u00e1lnych tabuliek, ktor\u00e9 nezobrazuj\u00fa d\u00e1ta ulo\u017een\u00e9 v SSTables, ale inform\u00e1cie poskytovan\u00e9 cez API (metriky v\u00fdkonu, inform\u00e1cie o nastaveniach, obsah cache, \u00fadaje o pripojen\u00fdch klientoch a pod.).\n<li class=\"l\"> Zv\u00fd\u0161en\u00e1 efektivita ukladania d\u00e1t v komprimovanej forme, \u010do umo\u017e\u0148uje zn\u00ed\u017ei\u0165 spotrebu diskov\u00e9ho priestoru a zv\u00fd\u0161i\u0165 v\u00fdkon oper\u00e1ci\u00ed \u010d\u00edtania.\n<li class=\"l\"> \u00dadaje t\u00fdkaj\u00face sa syst\u00e9mov\u00e9ho priestoru k\u013e\u00fa\u010dov (system.*) s\u00fa teraz predvolene umiestnen\u00e9 v prvej adres\u00e1ri namiesto rozmiestnenia vo v\u0161etk\u00fdch adres\u00e1roch s d\u00e1tami, \u010do umo\u017e\u0148uje zachova\u0165 funk\u010dnos\u0165 uzla v pr\u00edpade poruchy jedn\u00e9ho z dodato\u010dn\u00fdch diskov.\n<li class=\"l\"> Pridan\u00e1 experiment\u00e1lna podpora pre do\u010dasn\u00fa replik\u00e1ciu (Transient Replication) a lacn\u00e9 kv\u00f3rum (Cheap Quorums). Do\u010dasn\u00e9 repliky neukladaj\u00fa v\u0161etky \u00fadaje a pou\u017e\u00edvaj\u00fa inkrement\u00e1lne obnovenie na zos\u00faladenie s pln\u00fdmi replikami. Lacn\u00e9 kv\u00f3rum umo\u017e\u0148uje optimaliz\u00e1ciu z\u00e1pisov\u00fdch oper\u00e1ci\u00ed, pri ktorej sa z\u00e1pis do do\u010dasn\u00fdch repl\u00edk nevykon\u00e1va, k\u00fdm nie je k dispoz\u00edcii dostato\u010dn\u00fd s\u00fabor pln\u00fdch repl\u00edk.\n<li class=\"l\"> Pridan\u00e1 experiment\u00e1lna podpora pre Java 11.\n<li class=\"l\"> Pridan\u00e1 experiment\u00e1lna mo\u017enos\u0165 na porovnanie v\u0161etk\u00fdch Merklo stromov (Merkle Tree). Napr\u00edklad aktivovanie mo\u017enosti v klastri so 3 uzlami, kde s\u00fa dve repliky rovnak\u00e9 a jedna zastaran\u00e1, povedie k aktualiz\u00e1cii zastaranej repliky pou\u017eit\u00edm iba jednej oper\u00e1cie kop\u00edrovania aktu\u00e1lnej repliky.\n<li class=\"l\"> Pridan\u00e9 nov\u00e9 funkcie currentTimestamp, currentDate, currentTime a currentTimeUUID.\n<li class=\"l\"> Pridan\u00e1 podpora aritmetick\u00fdch oper\u00e1ci\u00ed v dotazoch CQL.\n<li class=\"l\"> Bola poskytnut\u00e1 mo\u017enos\u0165 vykon\u00e1vania aritmetick\u00fdch oper\u00e1ci\u00ed medzi d\u00e1tami s typmi \u201etimestamp\u201c\/\u201edate\u201c a \u201eduration\u201c.\n<li class=\"l\"> Bol pridan\u00fd re\u017eim na n\u00e1h\u013ead d\u00e1tov\u00fdch tokov potrebn\u00fdch na obnovu (nodetool repair \u2014preview) a mo\u017enos\u0165 kontroly integrity obnovovan\u00fdch d\u00e1t (nodetool repair \u2014validate).\n<li class=\"l\"> V dotazoch SELECT bola pridan\u00e1 mo\u017enos\u0165 spracovania prvkov Map a Set.\n<li class=\"l\"> Pridan\u00e1 podpora paraleliz\u00e1cie f\u00e1zy po\u010diato\u010dn\u00e9ho budovania materializovan\u00fdch poh\u013eadov (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> Do t\u00edmu &#171;nodetool cfstats&#187; bola pridan\u00e1 podpora triedenia pod\u013ea ur\u010dit\u00fdch metr\u00edk a obmedzenia po\u010dtu zobrazovan\u00fdch riadkov.\n<li class=\"l\"> Poskytnut\u00e9 nastavenia na obmedzenie pripojenia pou\u017e\u00edvate\u013ea len k ur\u010dit\u00fdm d\u00e1tov\u00fdm centr\u00e1m.\n<li class=\"l\"> Pridan\u00e1 mo\u017enos\u0165 obmedzenia intenzity (rate limit) oper\u00e1ci\u00ed vytv\u00e1rania a \u010distenia sn\u00edmok.\n<li class=\"l\"> V cqlsh a cqlshlib bola implementovan\u00e1 podpora Pythonu 3 (podpora Pythonu 2.7 zatia\u013e zachovan\u00e1).\n<li class=\"l\"> Podpora platformy Windows bola ukon\u010den\u00e1. Pre spustenie Cassandry vo Windows sa odpor\u00fa\u010da pou\u017e\u00edva\u0165 Linuxov\u00e9 prostredia vytvoren\u00e9 na z\u00e1klade subsyst\u00e9mu WSL2 (Windows Subsystem for Linux 2) alebo syst\u00e9mov virtualiz\u00e1cie.      <\/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=\"Prehrajte 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 \/>Zdroj: <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 5.0.4 - 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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