{"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\/et\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Saadaval on Andmebaasis Apache Cassandra 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Apache Software Foundation tutvustas jaotatud andmebaasi Apache Cassandra 4.0, mis kuulub noSQL-s\u00fcsteemide klassi ja on m\u00f5eldud suurte andmemahtude k\u00f5rge skaleeritavuse ja usaldusv\u00e4\u00e4rsuse tagamiseks, salvestades andmeid assotsiatiivsete massiivide (h\u00e4\u00e4lekaupluste) kujul. Cassandra 4.0 on tunnustatud tootmisrakenduste jaoks ja on juba testitud ettev\u00f5tete Amazon, Apple, DataStax, Instaclustr, iland ja Netflix infrastruktuurides, mille klastrid koosnevad enam kui 1000 s\u00f5lmest. Projekti kood on kirjutatud Java keeles ja jagatud Apache 2.0 litsentsi alusel.     <\/p>\n<p>Esialgselt t\u00f6\u00f6tas andmebaas Cassandra v\u00e4lja Facebook ning see anti 2009. aastal Apache fondi hoolde. Tootmislahendused, mis p\u00f5hinevad Cassandral, on kasutusele v\u00f5etud selliste ettev\u00f5tete teenuste toetamiseks nagu Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit ja Twitter. N\u00e4iteks Apple'i poolt \u00fcles seatud Apache Cassandra ladustamisinfra koosneb rohkem kui tuhandest klastrist, mis sisaldavad 160 tuhat s\u00f5lme ning hoiavad \u00fcle 100 petabaiti andmeid. Ettev\u00f5ttes Huawei kasutatakse rohkem kui 300 Apache Cassandra klastrit, mis h\u00f5lmavad 30 tuhat s\u00f5lme, ning Netflixis on \u00fcle 100 klastri, mis katab 10 tuhat s\u00f5lme ja t\u00f6\u00f6tleb rohkem kui triljoni p\u00e4ringu p\u00e4evas.     <\/p>\n<p>Andmebaas Cassandra \u00fchendab endas t\u00e4ielikult jaotatud hash-s\u00fcsteemi Dynamo, mis tagab praktiliselt lineaarse skaleeritavuse andmemahtu suurendades. Cassandra kasutab andmemudelit, mis p\u00f5hineb veergude perekondadel (ColumnFamily), mis erineb sarnastest s\u00fcsteemidest nagu memcachedb, mis hoiab andmeid ainult v\u00f5tme\/v\u00e4\u00e4rtuse paaridena, v\u00f5imaldades organizeerida mitme tasandi sisemise struktuuriga hashmap'e.  Andmebaasiga suhtlemise lihtsustamiseks toetatakse struktureeritud p\u00e4ringute koostamise keelt CQL (Cassandra Query Language), mis sarnaneb SQL-iga, kuid mille funktsionaalsus on piiratud. Toetatakse nimes\u00fcsteemide ja veergude perekondade, indeksite loomise kaudu v\u00e4ljendi \u201eCREATE INDEX\u201c abil.      <\/p>\n<p>Andmebaas v\u00f5imaldab luua t\u00f5rkealti salvestusruume: andmebaasi sisestatud andmed replitseeritakse automaatselt mitmele s\u00f5lmele jaotatud v\u00f5rgus, mis v\u00f5ib katab erinevaid. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/kompaniya\/data-centers\/\"   title=\"andmekeskustesse\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">andmekeskustesse<\/a>. S\u00f5lme rikke korral \u00fcle v\u00f5tavad selle funktsioonid teised s\u00f5lmed koheselt. Uute s\u00f5lmede lisamine klastrisse ja Cassandra versiooni uuendamine toimub reaalajas, ilma t\u00e4iendava k\u00e4sitsi sekkumise ja teiste s\u00f5lmede \u00fcmberkonfigureerimiseta. CQL-i toetavad draiverid on valmistatud keeltele Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ ja JavaScript (Node.js).        <\/p>\n<p>P\u00f5hilised uuendused:   <\/p>\n<ul>\n<li class=\"l\"> T\u00f5husus ja skaleeritavus on suurenenud. Andmevahetuse efektiivsus SSTable (Sorted Strings Table) formaadis s\u00f5lmede vahel on paranenud. S\u00f5lmede vahelise s\u00f5numivahetuse protokoll (Internode Messaging Protocol) on optimeeritud. Andmevoogude edastamise kiirus s\u00f5lmede vahel on kasvanud kuni 5 korda (peamiselt t\u00e4nu Zero Copy tehnikale ja SSTable-de edastamisele tervikuna), samas kui lugemise ja kirjutamise toimingute l\u00e4bilaskvus on kasvanud kuni 25%. Inkrementaalne taastamise protsess on optimeeritud. J\u00e4\u00e4tmed, mis tulenevad pr\u00fcgi koristaja peatamisest, on v\u00e4henenud vaid m\u00f5ne millisekundi v\u00f5rra.\n<li class=\"l\"> Lisatud on auditi logi tugi, mis v\u00f5imaldab j\u00e4lgida kasutajate autentimise operatsioone ja k\u00f5iki teostatavaid CQL p\u00e4ringuid.\n<li class=\"l\"> Lisatud on t\u00e4ieliku binaarse p\u00e4ringulogimise v\u00f5imalus, mis v\u00f5imaldab salvestada kogu p\u00e4ringu ja vastuste liikluse.  Halduseks on ette n\u00e4htud k\u00e4sud \u201enodetool enablefullquerylog|disablefullquerylog|resetfullquerylog\u201c, anal\u00fc\u00fcsimiseks on saadaval utiliit fqltool. Pakutakse k\u00e4ske logi lugemiseks (Dump), aktiivsuse l\u00f5igete v\u00f5rdlemiseks (Compare) ja uuesti t\u00e4itmiseks (Replay) anal\u00fc\u00fcsimiseks koos tingimuste taastamisega, mis on iseloomulikud reaalsetele koormustele.\n<li class=\"l\"> Lisatud toetus virtuaalsete tabelite jaoks, mis kajastavad mitte SSTables'is sisalduvaid andmeid, vaid teavet, mis edastatakse API kaudu (t\u00f5hususe m\u00f5\u00f5dud, seadistuste info, vahem\u00e4lu sisu, \u00fchendatud klientide andmed jne).\n<li class=\"l\"> T\u00f5hustatud andmete salvestamise efektiivsust kokkupressitud vormis, mis v\u00f5imaldab v\u00e4hendada kettaruumi tarbimist ja suurendada lugemisoperatsioonide t\u00f5husust.\n<li class=\"l\"> S\u00fcsteemi v\u00f5tme ruumile (system.*) seotud andmed asetatakse n\u00fc\u00fcd vaikimisi esimesse katalooge, selle asemel, et jaotuda k\u00f5igisse andmekataloogidesse, mis aitab s\u00e4ilitada s\u00f5lme t\u00f6\u00f6korras, kui \u00fcks lisadiskidest t\u00f5rkub.\n<li class=\"l\"> K\u00e4egakatsutav toetus ajutisele replikatsioonile (Transient Replication) ja kergetele kvoorumitele (Cheap Quorums) on lisatud. Ajutised replikad ei salvestada k\u00f5iki andmeid ja kasutavad t\u00e4iendavate replikate konsolideerimiseks inkrementaalset taastamist. Kerged kvoorumid realiseerivad kirjutamisoperatsioonide optimeerimise, kus kirjutamine ajutistesse replikatesse ei toimu, kuni piisav arv t\u00e4iendavaid replikas on kergesti saadaval.\n<li class=\"l\"> K\u00e4egakatsutav toetus Java 11-le on lisatud.\n<li class=\"l\"> K\u00e4egakatsutav valik k\u00f5igi Merkle puude (Merkle Tree) v\u00f5rdlemiseks on lisatud. N\u00e4iteks valiku lubamine kolmnodega klastris, kus kaks replikat on samad ja \u00fcks on aegunud, toob kaasa aegunud replikate uuendamise ainult \u00fche aktiivse replikati kopeerimise operatsiooni abil.\n<li class=\"l\"> Uued funktsioonid currentTimestamp, currentDate, currentTime ja currentTimeUUID on lisatud.\n<li class=\"l\"> Lisatud to suport matemaatilisi opereerimise CQL-i p\u00e4ringutes.\n<li class=\"l\"> Pakutakse v\u00f5imalust teostada aritmeetilisi operatsioone andmete vahel, mille t\u00fc\u00fcp on \u201etimestamp\u201c\/\u201edate\u201c ja \u201eduration\u201c.\n<li class=\"l\"> Lisatud on re\u017eiim vajalike andmevoogude eelvaateks (nodetool repair \u2014preview) ning v\u00f5imalus kontrollida taastatavate andmete terviklikkust (nodetool repair \u2014validate).\n<li class=\"l\"> SELECT-p\u00e4ringutes on lisatud v\u00f5imalus t\u00f6\u00f6delda Map ja Set elemente.\n<li class=\"l\"> Lisatud tugi materjaliseeritud vaadete algse koostamise paralleelseks teostamiseks (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> K\u00e4sule \u201enodetool cfstats\u201c on lisatud toetus sorteerimiseks teatud metrikate j\u00e4rgi ning piiramiseks v\u00e4ljundridade arvu.\n<li class=\"l\"> Kasutajate \u00fchenduse piiramiseks on antud seadistused ainult teatud andmekeskustega \u00fchendamiseks.\n<li class=\"l\"> Lisatud v\u00f5imalus piirata toimingute intensiivsust (rate limit) pildistamiste loomisel ja puhastamisel.\n<li class=\"l\"> CQLSH ja CQLSHLIB toetavad n\u00fc\u00fcd Python 3 (Python 2.7 tugi on j\u00e4tkuvalt s\u00e4ilinud).\n<li class=\"l\"> Windows platvormi toetus on l\u00f5petatud. Cassandra k\u00e4ivitamiseks Windowsis on soovitatav kasutada Linuxi keskkondi, mis on loodud WSL2 (Windows Subsystem for Linux 2) v\u00f5i virtualiseerimiss\u00fcsteemide alusel.      <\/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=\"Vaata videot\" 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 \/>Allikas: <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 5.0.0.1 - 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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