{"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\/sv\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Databasen Apache Cassandra 4.0 \u00e4r tillg\u00e4nglig.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Apache Software Foundation har sl\u00e4ppt version 4.0 av den distribuerade databashanteraren Apache Cassandra, som tillh\u00f6r klassen noSQL-system och \u00e4r avsedd f\u00f6r att skapa h\u00f6gskalerbara och p\u00e5litliga lagringsl\u00f6sningar f\u00f6r stora m\u00e4ngder data, lagrad i form av en associativ array (hash). Utg\u00e5van av Cassandra 4.0 anses vara redo f\u00f6r produktionsanv\u00e4ndning och har redan testats i infrastrukturen hos f\u00f6retag som Amazon, Apple, DataStax, Instaclustr, iland och Netflix med kluster som har \u00f6ver 1000 noder. Projektkoden \u00e4r skriven i Java och distribueras under Apache 2.0-licensen.     <\/p>\n<p>Ett ursprungligt databashanteringssystem (DBMS) kallat Cassandra utvecklades av Facebook och \u00f6verl\u00e4mnades \u00e5r 2009 till Apache-fonden. Kommersiella l\u00f6sningar baserade p\u00e5 Cassandra anv\u00e4nds av f\u00f6retag som Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit och Twitter. Till exempel anv\u00e4nder Apple en infrastruktur f\u00f6r lagring baserad p\u00e5 Apache Cassandra som omfattar mer \u00e4n tusen kluster med 160 000 noder och lagrar \u00f6ver 100 petabyte data. Huawei anv\u00e4nder mer \u00e4n 300 kluster av Apache Cassandra, som har 30 000 noder, medan Netflix har \u00f6ver 100 kluster som str\u00e4cker sig \u00f6ver 10 000 noder och hanterar mer \u00e4n en biljon beg\u00e4rningar per dag.     <\/p>\n<p>DBMS Cassandra f\u00f6renar ett helt distribuerat hash-system, Dynamo, som m\u00f6jligg\u00f6r praktiskt taget linj\u00e4r skalbarhet n\u00e4r datavolymen \u00f6kar. Cassandra anv\u00e4nder en datalagringsmodell baserad p\u00e5 kolumnfamiljer (ColumnFamily), vilket skiljer sig fr\u00e5n system som memcachedb, som endast lagrar data i en nyckel\/v\u00e4rde-koppling, genom att m\u00f6jligg\u00f6ra lagring av hash med flera niv\u00e5er av inb\u00e4ddning. F\u00f6r att underl\u00e4tta interaktion med databasen st\u00f6djer den ett strukturerat fr\u00e5gespr\u00e5k, CQL (Cassandra Query Language), som liknar SQL men \u00e4r begr\u00e4nsat i funktionalitet. Bland de m\u00f6jligheter som erbjuds finns st\u00f6d f\u00f6r namnutrymmen och kolumnfamiljer, samt att skapa index via uttrycket 'CREATE INDEX'.      <\/p>\n<p>Databashanteraren m\u00f6jligg\u00f6r skapande av felfria lagringsl\u00f6sningar: data som placeras i databasen replikerar automatiskt till flera noder inom det distribuerade n\u00e4tverket, vilket kan omfatta olika <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/kompaniya\/data-centers\/\"   title=\"datacenter\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">datacenter<\/a>. Vid nodfel tar andra noder automatiskt \u00f6ver dess funktioner. Till\u00e4gg av nya noder till klustret och uppgradering av Cassandra-versionen sker automatiskt, utan ytterligare manuell intervention och omkonfigurering av andra noder. Drivrutiner med st\u00f6d f\u00f6r CQL finns tillg\u00e4ngliga f\u00f6r spr\u00e5k som Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ och JavaScript (Node.js).        <\/p>\n<p>Huvudsakliga nyheter:   <\/p>\n<ul>\n<li class=\"l\"> Prestanda och skalbarhet har \u00f6kats. Effektiviteten vid datautbyte i SSTable-format (Sorted Strings Table) mellan noder har f\u00f6rb\u00e4ttrats. Protokollet f\u00f6r meddelandeutbyte mellan noder (Internode Messaging Protocol) har optimerats. Hastigheten f\u00f6r datastreaming mellan noder har \u00f6kat upp till 5 g\u00e5nger (fr\u00e4mst tack vare anv\u00e4ndningen av Zero Copy-teknik och hel \u00f6verf\u00f6ring av SSTables), medan bandbredden vid l\u00e4s- och skrivoperationer har \u00f6kat med upp till 25%. Processen f\u00f6r inkrementell \u00e5terst\u00e4llning har optimerats. F\u00f6rdr\u00f6jningar p\u00e5 grund av pausning orsakad av skr\u00e4psamlaren har minskats till n\u00e5gra millisekunder.\n<li class=\"l\"> St\u00f6d f\u00f6r revisionslogg har lagts till, vilket m\u00f6jligg\u00f6r sp\u00e5rning av anv\u00e4ndarautentisering och alla utf\u00f6rda CQL-fr\u00e5gor.\n<li class=\"l\"> M\u00f6jligheten att f\u00f6ra en fullst\u00e4ndig bin\u00e4r logg \u00f6ver beg\u00e4rningar har lagts till, vilket m\u00f6jligg\u00f6r sparande av hela trafikfl\u00f6det av beg\u00e4rningar och svar. F\u00f6r hantering erbjuds kommandon som 'nodetool enablefullquerylog|disablefullquerylog|resetfullquerylog', och f\u00f6r analys levereras verktyget fqltool. Kommandon tillhandah\u00e5lls f\u00f6r att omvandla loggen till ett l\u00e4sbart format (Dump), j\u00e4mf\u00f6ra aktivitetsklyftor (Compare) och utf\u00f6ra (Replay) f\u00f6r analys med \u00e5tergivning av villkor som \u00e4r typiska f\u00f6r verklig belastning.\n<li class=\"l\"> St\u00f6d f\u00f6r virtuella tabeller har lagts till, som speglar inte data lagrat i SSTables, utan information som tillhandah\u00e5lls via API (prestandametrik, inst\u00e4llningsinformation, cacheinneh\u00e5ll, information om anslutna klienter etc.).\n<li class=\"l\"> Effektiviteten vid lagring av data i komprimerad form har \u00f6kats, vilket medger minskad diskplatsanv\u00e4ndning och \u00f6kad prestanda vid l\u00e4soperationer.\n<li class=\"l\"> Data som r\u00f6r systemets nyckelrum (system.*) placeras nu som standard i den f\u00f6rsta katalogen ist\u00e4llet f\u00f6r att spridas \u00f6ver alla kataloger med data, vilket g\u00f6r det m\u00f6jligt att uppr\u00e4tth\u00e5lla nodens funktionalitet vid ett fel p\u00e5 en av de ytterligare diskarna.\n<li class=\"l\"> Experimentellt st\u00f6d f\u00f6r tempor\u00e4r replikation (Transient Replication) och l\u00e4tta kvorum (Cheap Quorums) har lagts till. Tempor\u00e4ra replikat lagrar inte all data och anv\u00e4nder inkrementell \u00e5terst\u00e4llning f\u00f6r att synkronisera med fullst\u00e4ndiga replikat. L\u00e4tta kvorum implementerar optimering av skrivoperationer, d\u00e4r skrivning till tempor\u00e4ra replikat inte g\u00f6rs f\u00f6rr\u00e4n ett tillr\u00e4ckligt antal fullst\u00e4ndiga replikat \u00e4r tillg\u00e4ngliga.\n<li class=\"l\"> Experimentellt st\u00f6d f\u00f6r Java 11 har lagts till.\n<li class=\"l\"> En experimentell funktion f\u00f6r att j\u00e4mf\u00f6ra alla Merkle-tr\u00e4d (Merkle Tree) har lagts till. Till exempel, om funktionen aktiveras i en kluster med 3 noder, d\u00e4r tv\u00e5 replikat \u00e4r identiska och ett \u00e4r f\u00f6r\u00e5ldrat, kommer det att leda till att det f\u00f6r\u00e5ldrade replikatet uppdateras med endast en kopieringsoperation av det aktuella replikatet.\n<li class=\"l\"> Nya funktioner currentTimestamp, currentDate, currentTime och currentTimeUUID har lagts till.\n<li class=\"l\"> St\u00f6d f\u00f6r aritmetiska operationer i CQL-fr\u00e5gor har lagts till.\n<li class=\"l\"> M\u00f6jligheten att utf\u00f6ra aritmetiska operationer mellan data med typerna 'timestamp'\/'date' och 'duration' har tillhandah\u00e5llits.\n<li class=\"l\"> Ett l\u00e4ge f\u00f6r f\u00f6rhandsgranskning av datastreamar som \u00e4r n\u00f6dv\u00e4ndiga f\u00f6r \u00e5terst\u00e4llning har lagts till (nodetool repair -preview) och m\u00f6jlighet att kontrollera integriteten hos de \u00e5terst\u00e4llda uppgifterna (nodetool repair -validate).\n<li class=\"l\"> I SELECT-fr\u00e5gor har m\u00f6jligheten att bearbeta Map- och Set-element lagts till.\n<li class=\"l\"> St\u00f6d f\u00f6r parallellisering av det initiala bygget av materialiserade vyer (cassandra.yaml:concurrent_materialized_view_builders) har lagts till.\n<li class=\"l\"> I teamet &#171;nodetool cfstats&#187; har st\u00f6d f\u00f6r sortering efter specifika metrier och begr\u00e4nsning av antalet utskrivna rader lagts till.\n<li class=\"l\"> Inst\u00e4llningar f\u00f6r att begr\u00e4nsa anv\u00e4ndarens anslutning till specifika datacenter har tillhandah\u00e5llits.\n<li class=\"l\"> M\u00f6jlighet att begr\u00e4nsa intensiteten (rate limit) av operationer f\u00f6r skapande och rensning av snapshots har lagts till.\n<li class=\"l\"> St\u00f6d f\u00f6r Python 3 har implementerats i cqlsh och cqlshlib (st\u00f6d f\u00f6r Python 2.7 bevaras fortfarande).\n<li class=\"l\"> St\u00f6det f\u00f6r Windows-plattformen har upph\u00f6rt. F\u00f6r att k\u00f6ra Cassandra p\u00e5 Windows rekommenderas anv\u00e4ndning av Linux-milj\u00f6er skapade p\u00e5 grundval av WSL2 (Windows Subsystem for Linux 2) eller virtualiseringssystem.      <\/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=\"Spela 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 \/>K\u00e4lla: <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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