{"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\/cs\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Datab\u00e1zov\u00fd syst\u00e9m Apache Cassandra 4.0 je nyn\u00ed k dispozici","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Organizace Apache Software Foundation p\u0159edstavila vyd\u00e1n\u00ed distribuovan\u00e9ho datab\u00e1zov\u00e9ho syst\u00e9mu Apache Cassandra 4.0, kter\u00fd spad\u00e1 do kategorie noSQL syst\u00e9m\u016f a je navr\u017een pro vytv\u00e1\u0159en\u00ed vysoce \u0161k\u00e1lovateln\u00fdch a spolehliv\u00fdch \u00falo\u017ei\u0161\u0165 obrovsk\u00fdch objem\u016f dat, uchov\u00e1van\u00fdch ve form\u011b asociativn\u00edho pole (ha\u0161e). Vyd\u00e1n\u00ed Cassandra 4.0 bylo uzn\u00e1no jako p\u0159ipraven\u00e9 pro pracovn\u00ed nasazen\u00ed a ji\u017e bylo testov\u00e1no v infrastruktur\u00e1ch spole\u010dnost\u00ed jako Amazon, Apple, DataStax, Instaclustr, iland a Netflix s clustery obsahuj\u00edc\u00edmi v\u00edce ne\u017e 1000 uzl\u016f. K\u00f3d projektu je naps\u00e1n v programovac\u00edm jazyce Java a je distribuov\u00e1n na z\u00e1klad\u011b licence Apache 2.0.     <\/p>\n<p>P\u016fvodn\u011b byla datab\u00e1ze Cassandra vyvinuta spole\u010dnost\u00ed Facebook a v roce 2009 byla p\u0159ed\u00e1na pod spr\u00e1vu nadace Apache. Pr\u016fmyslov\u00e1 \u0159e\u0161en\u00ed zalo\u017een\u00e1 na Cassand\u0159e byla nasazena k zaji\u0161t\u011bn\u00ed provozu slu\u017eeb takov\u00fdch spole\u010dnost\u00ed, jako jsou Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit a Twitter. Nap\u0159\u00edklad infrastruktura pro ukl\u00e1d\u00e1n\u00ed dat, kterou z\u0159\u00eddila spole\u010dnost Apple, zahrnuje v\u00edce ne\u017e tis\u00edc cluster\u016f, kter\u00e9 maj\u00ed 160 tis\u00edc uzl\u016f a uchov\u00e1vaj\u00ed v\u00edce ne\u017e 100 petabajt\u016f dat. Spole\u010dnost Huawei pou\u017e\u00edv\u00e1 v\u00edce ne\u017e 300 cluster\u016f Apache Cassandra, kter\u00e9 zahrnuj\u00ed 30 tis\u00edc uzl\u016f, a ve spole\u010dnosti Netflix je v\u00edce ne\u017e 100 cluster\u016f pokr\u00fdvaj\u00edc\u00edch 10 tis\u00edc uzl\u016f, kter\u00e9 zpracov\u00e1vaj\u00ed p\u0159es trilli\u00f3n po\u017eadavk\u016f denn\u011b.     <\/p>\n<p>Datab\u00e1ze Cassandra kombinuje pln\u011b distribuovan\u00fd hash syst\u00e9m Dynamo, kter\u00fd zaji\u0161\u0165uje prakticky line\u00e1rn\u00ed \u0161k\u00e1lovatelnost p\u0159i zvy\u0161ov\u00e1n\u00ed objemu dat. Cassandra pou\u017e\u00edv\u00e1 model ukl\u00e1d\u00e1n\u00ed dat na z\u00e1klad\u011b rodin sloupc\u016f (ColumnFamily), co\u017e se li\u0161\u00ed od syst\u00e9m\u016f podobn\u00fdch memcachedb, kter\u00e9 ukl\u00e1daj\u00ed data pouze v p\u00e1rech kl\u00ed\u010d\/hodnota, a umo\u017e\u0148uje organizaci ukl\u00e1d\u00e1n\u00ed hash\u016f s v\u00edce\u00farov\u0148ovou zano\u0159enost\u00ed. Pro usnadn\u011bn\u00ed interakce s datab\u00e1z\u00ed je podporov\u00e1n jazyk pro vytv\u00e1\u0159en\u00ed strukturovan\u00fdch dotaz\u016f CQL (Cassandra Query Language), kter\u00fd p\u0159ipom\u00edn\u00e1 SQL, ale m\u00e1 omezenou funk\u010dnost. Z funkc\u00ed lze zm\u00ednit podporu prostor\u016f n\u00e1zv\u016f a rodin sloupc\u016f, vytv\u00e1\u0159en\u00ed index\u016f pomoc\u00ed v\u00fdrazu \u201eCREATE INDEX\u201c.      <\/p>\n<p>Datab\u00e1zov\u00fd syst\u00e9m umo\u017e\u0148uje vytv\u00e1\u0159et odoln\u00e1 \u00falo\u017ei\u0161t\u011b: data ukl\u00e1dan\u00e1 v datab\u00e1zi se automaticky replikuj\u00ed na n\u011bkolik uzl\u016f distribuovan\u00e9 s\u00edt\u011b, kter\u00e1 m\u016f\u017ee pokr\u00fdvat r\u016fzn\u00e9 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/kompaniya\/data-centers\/\"   title=\"datov\u00fdch center\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">datov\u00fdch center<\/a>. P\u0159i selh\u00e1n\u00ed uzlu jeho funkce okam\u017eit\u011b p\u0159eb\u00edraj\u00ed jin\u00e9 uzly. P\u0159id\u00e1v\u00e1n\u00ed nov\u00fdch uzl\u016f do clustera a aktualizace verze Cassandra prob\u00edh\u00e1 za chodu, bez dal\u0161\u00edho ru\u010dn\u00edho z\u00e1sahu a p\u0159ekonfigurov\u00e1n\u00ed ostatn\u00edch uzl\u016f. Ovlada\u010de s podporou CQL jsou p\u0159ipraveny pro jazyky Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ a JavaScript (Node.js).        <\/p>\n<p>Hlavn\u00ed novinky:   <\/p>\n<ul>\n<li class=\"l\"> Zv\u00fd\u0161ena v\u00fdkonnost a \u0161k\u00e1lovatelnost. Zv\u00fd\u0161ena \u00fa\u010dinnost v\u00fdm\u011bny dat ve form\u00e1tu SSTable (Sorted Strings Table) mezi uzly. Optimalizov\u00e1n protokol pro v\u00fdm\u011bnu zpr\u00e1v mezi uzly (Internode Messaging Protocol). Rychlost p\u0159enosu datov\u00fdch proud\u016f mezi uzly se zv\u00fd\u0161ila a\u017e 5kr\u00e1t (p\u0159edev\u0161\u00edm d\u00edky pou\u017eit\u00ed techniky Zero Copy a p\u0159enosu SSTables jako celku), zat\u00edmco propustnost p\u0159i operac\u00edch \u010dten\u00ed a z\u00e1pisu vzrostla o 25 %. Optimalizov\u00e1n proces inkrement\u00e1ln\u00edho obnoven\u00ed. Zpo\u017ed\u011bn\u00ed zp\u016fsoben\u00e1 pozastaven\u00edm prov\u00e1d\u011bn\u00edm garbage collector byla sn\u00ed\u017eena na n\u011bkolik milisekund.\n<li class=\"l\"> P\u0159id\u00e1na podpora pro auditn\u00ed protokol, kter\u00fd umo\u017e\u0148uje sledovat operace autentizace u\u017eivatel\u016f a v\u0161echny vykon\u00e1van\u00e9 dotazy CQL.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost veden\u00ed \u00fapln\u00e9ho bin\u00e1rn\u00edho logu po\u017eadavk\u016f, kter\u00fd umo\u017e\u0148uje uchov\u00e1vat ve\u0161ker\u00fd provoz po\u017eadavk\u016f a odpov\u011bd\u00ed. Pro spr\u00e1vu jsou navr\u017eeny p\u0159\u00edkazy \u201enodetool enablefullquerylog|disablefullquerylog|resetfullquerylog\u201c, a pro anal\u00fdzu logu je p\u0159id\u00e1na utilita fqltool. Jsou poskytnuty p\u0159\u00edkazy pro p\u0159evod logu do \u010diteln\u00e9ho form\u00e1tu (Dump), porovn\u00e1n\u00ed \u0159ez\u016f aktivity (Compare) a op\u011btovn\u00e9 proveden\u00ed (Replay) pro anal\u00fdzu s reprodukc\u00ed podm\u00ednek, kter\u00e9 jsou typick\u00e9 pro re\u00e1lnou z\u00e1t\u011b\u017e.\n<li class=\"l\"> P\u0159id\u00e1na podpora virtu\u00e1ln\u00edch tabulek, kter\u00e9 neodr\u00e1\u017eej\u00ed data ulo\u017een\u00e1 v SSTables, ale informace poskytovan\u00e9 prost\u0159ednictv\u00edm API (metriky v\u00fdkonu, informace o nastaven\u00ed, obsah cache, \u00fadaje o p\u0159ipojen\u00fdch klientech atd.).\n<li class=\"l\"> Zv\u00fd\u0161ena \u00fa\u010dinnost ukl\u00e1d\u00e1n\u00ed dat v komprimovan\u00e9 podob\u011b, co\u017e umo\u017e\u0148uje sn\u00ed\u017eit spot\u0159ebu diskov\u00e9ho prostoru a zv\u00fd\u0161it v\u00fdkon \u010dtec\u00edch operac\u00ed.\n<li class=\"l\"> Data t\u00fdkaj\u00edc\u00ed se syst\u00e9mov\u00e9ho prostoru kl\u00ed\u010d\u016f (system.*) jsou nyn\u00ed ve v\u00fdchoz\u00edm nastaven\u00ed um\u00edst\u011bna v prvn\u00ed adres\u00e1\u0159i, nam\u00edsto rozlo\u017een\u00ed po v\u0161ech adres\u00e1\u0159\u00edch s daty, co\u017e umo\u017e\u0148uje zachovat funk\u010dnost uzlu v p\u0159\u00edpad\u011b selh\u00e1n\u00ed jednoho z p\u0159\u00eddavn\u00fdch disk\u016f.\n<li class=\"l\"> Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora do\u010dasn\u00e9 replikace (Transient Replication) a lehk\u00fdch kvorum\u016f (Cheap Quorums). Do\u010dasn\u00e9 repliky neukl\u00e1daj\u00ed v\u0161echna data a pou\u017e\u00edvaj\u00ed inkrement\u00e1ln\u00ed obnovu pro synchronizaci s \u00fapln\u00fdmi replikami. Lehk\u00e9 kvory optimalizuj\u00ed z\u00e1pisov\u00e9 operace, kdy se z\u00e1pis do do\u010dasn\u00fdch replik neprov\u00e1d\u00ed, dokud nen\u00ed dostupn\u00e1 dostate\u010dn\u00e1 sada \u00fapln\u00fdch replik.\n<li class=\"l\"> Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora pro Java 11.\n<li class=\"l\"> Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed volba pro porovn\u00e1n\u00ed v\u0161ech Merklov\u00fdch strom\u016f (Merkle Tree). Nap\u0159\u00edklad aktivace t\u00e9to volby na clusteru se 3 uzly, kde jsou dv\u011b repliky shodn\u00e9 a jedna je zastaral\u00e1, povede k proveden\u00ed aktualizace zastaral\u00e9 repliky pomoc\u00ed pouze jedn\u00e9 operace kop\u00edrov\u00e1n\u00ed aktu\u00e1ln\u00ed repliky.\n<li class=\"l\"> Byly p\u0159id\u00e1ny nov\u00e9 funkce currentTimestamp, currentDate, currentTime a currentTimeUUID.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora aritmetick\u00fdch operac\u00ed v dotazech CQL.\n<li class=\"l\"> Byla poskytnuta mo\u017enost prov\u00e1d\u011bn\u00ed aritmetick\u00fdch operac\u00ed mezi daty s typy \u201etimestamp\u201c\/\u201edate\u201c a \u201eduration\u201c.\n<li class=\"l\"> Byl p\u0159id\u00e1n re\u017eim pro n\u00e1hled datov\u00fdch tok\u016f pot\u0159ebn\u00fdch pro obnovu (nodetool repair \u2014preview) a mo\u017enost kontroly integrity obnovovan\u00fdch dat (nodetool repair \u2014validate).\n<li class=\"l\"> V dotazech SELECT byla p\u0159id\u00e1na mo\u017enost zpracov\u00e1n\u00ed prvk\u016f Map a Set.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora paralelizace f\u00e1ze po\u010d\u00e1te\u010dn\u00edho sestaven\u00ed materializovan\u00fdch pohled\u016f (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> Do t\u00fdmu &#171;nodetool cfstats&#187; byla p\u0159id\u00e1na podpora t\u0159\u00edd\u011bn\u00ed podle ur\u010dit\u00fdch metr\u016f a omezen\u00ed po\u010dtu zobrazovan\u00fdch \u0159\u00e1dk\u016f.\n<li class=\"l\"> Byly poskytnuty nastaven\u00ed pro omezen\u00ed p\u0159ipojen\u00ed u\u017eivatele pouze k ur\u010dit\u00fdm datov\u00fdm centr\u016fm.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost omezen\u00ed intenzity (rate limit) operac\u00ed vytv\u00e1\u0159en\u00ed a \u010di\u0161t\u011bn\u00ed snapshot\u016f.\n<li class=\"l\"> V cqlsh a cqlshlib byla implementov\u00e1na podpora Python 3 (podpora Python 2.7 je zat\u00edm zachov\u00e1na).\n<li class=\"l\"> Byla ukon\u010dena podpora platformy Windows. Pro spu\u0161t\u011bn\u00ed Cassandry ve Windows se doporu\u010duje pou\u017e\u00edvat prost\u0159ed\u00ed Linux zalo\u017een\u00e9 na subsyst\u00e9mu WSL2 (Windows Subsystem for Linux 2) nebo virtualiza\u010dn\u00ed syst\u00e9my.      <\/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=\"P\u0159ehr\u00e1t 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 5.0.3 - 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 \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.\" \/>\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\/cs\/blog\/news\/dostupna-subd-apache-cassandra-4-0\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"cs_CZ\" \/>\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\u0414\u043e\u0441\u0442\u0443\u043f\u043d\u0430 \u0421\u0423\u0411\u0414 Apache Cassandra 4.0 | ProHoster\" \/>\n\t\t<meta property=\"og: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 \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.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/cs\/blog\/news\/dostupna-subd-apache-cassandra-4-0\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-07-29T14:23:28+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-07-29T14:23:28+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Dostupn\u00e1 DBMS Apache Cassandra 4.0 | ProHoster","description":"Organizace Apache Software Foundation p\u0159edstavila vyd\u00e1n\u00ed distribuovan\u00e9 DBMS Apache Cassandra 4.0, kter\u00e1 pat\u0159\u00ed do kategorie noSQL syst\u00e9m\u016f a je ur\u010dena k vytv\u00e1\u0159en\u00ed vysoce \u0161k\u00e1lovateln\u00fdch a spolehliv\u00fdch \u00falo\u017ei\u0161\u0165 obrovsk\u00fdch dat.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupna-subd-apache-cassandra-4-0","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"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","og:type":"article","og:title":"\ud83e\udd47\u0414\u043e\u0441\u0442\u0443\u043f\u043d\u0430 \u0421\u0423\u0411\u0414 Apache Cassandra 4.0 | ProHoster","og:description":"\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.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupna-subd-apache-cassandra-4-0","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2021-07-29T14:23:28+00:00","article:modified_time":"2021-07-29T14:23:28+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"100871","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-07-29 15:28:28","updated":"2022-09-30 04:09:05","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/100871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=100871"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/100871\/revisions"}],"predecessor-version":[{"id":164520,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/100871\/revisions\/164520"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=100871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=100871"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=100871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}