{"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\/da\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Database management systemet Apache Cassandra 4.0 er tilg\u00e6ngeligt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Apache Software Foundation har pr\u00e6senteret udgivelsen af den distribuerede DBMS Apache Cassandra 4.0, som tilh\u00f8rer klassen af noSQL-systemer og er designet til at skabe h\u00f8jt skalerbare og p\u00e5lidelige lagre af enorme datam\u00e6ngder, der opbevares i form af associative arrays (hashes). Udgivelsen af Cassandra 4.0 er blevet anerkendt som klar til produktionsimplementering og er allerede blevet testet i infrastrukturerne hos virksomheder som Amazon, Apple, DataStax, Instaclustr, iland og Netflix med klynger, der omfatter over 1000 noder. Projektkoden er skrevet i Java og distribueres under Apache 2.0-licensen.     <\/p>\n<p>Originally, the Cassandra DB was developed by Facebook and transferred to the Apache Foundation in 2009. Industrial solutions based on Cassandra are deployed to support services for companies like Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit, and Twitter. For example, Apple's infrastructure built on Apache Cassandra consists of over a thousand clusters, including 160 thousand nodes, storing more than 100 petabytes of data. Huawei uses more than 300 Apache Cassandra clusters with 30 thousand nodes, while Netflix has over 100 clusters encompassing 10 thousand nodes and processing more than a trillion requests per day.     <\/p>\n<p>Cassandra DB combines a fully distributed hash system, Dynamo, which provides almost linear scalability as data volume increases. Cassandra employs a data storage model based on column families (ColumnFamily), distinct from systems like memcachedb that store data only as key\/value pairs, allowing for the organization of hash storage with multiple levels of nesting. To simplify interaction with the database, it supports the CQL (Cassandra Query Language), which resembles SQL but is limited in functionality. Features include support for namespaces and column families, and the creation of indexes via the &#171;CREATE INDEX&#187; expression.      <\/p>\n<p>DBMS'en g\u00f8r det muligt at oprette fejlsikre lagersystemer: data, der placeres i databasen, bliver automatisk replikeret p\u00e5 flere noder i det distribuerede netv\u00e6rk, som kan str\u00e6kke sig over forskellige <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/kompaniya\/data-centers\/\"   title=\"data centres\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">data centres<\/a>. Ved nedbrud af en node overtages dens funktioner hurtigt af andre noder. Tilf\u00f8jelse af nye noder til klyngen og opdatering af Cassandra-versionen sker automatisk, uden ekstra manuel indgriben og omkonfiguration af andre noder. Drivere med CQL-underst\u00f8ttelse er tilg\u00e6ngelige for sprog som Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ og JavaScript (Node.js).        <\/p>\n<p>Hovednyhederne:   <\/p>\n<ul>\n<li class=\"l\"> Ydeevne og skalerbarhed er forbedret. Effektiviteten af dataudveksling i SSTable-format (Sorted Strings Table) mellem noderne er \u00f8get. Protokollen for intern nudemessaging (Internode Messaging Protocol) er optimeret. Dataoverf\u00f8rsels hastigheden mellem noder er steget med op til 5 gange (prim\u00e6rt takket v\u00e6re brugen af Zero Copy teknik og overf\u00f8rsel af SSTables i sin helhed), mens b\u00e5ndbredden ved l\u00e6se- og skriveoperationer er forbedret med op til 25%. Processen for inkrementel gendannelse er optimeret. Forsinkelser p\u00e5 grund af pause i affaldsindsamleren er reduceret til et par millisekunder.\n<li class=\"l\"> Underst\u00f8ttelse af revisionslog er tilf\u00f8jet, s\u00e5 det er muligt at overv\u00e5ge brugerautentifikationsoperationer og alle CQL-foresp\u00f8rgsler.\n<li class=\"l\"> The ability to maintain a complete binary log of requests has been added, allowing for the preservation of all traffic for requests and responses. Management commands &#171;nodetool enablefullquerylog|disablefullquerylog|resetfullquerylog&#187; are provided, and an fqltool utility is supplied for log analysis. Commands to transform the log into a readable format (Dump), compare activity slices (Compare), and replay (Replay) are included for analyzing conditions characteristic of real loads.\n<li class=\"l\"> Underst\u00f8ttelse af virtuelle tabeller, der ikke afspejler data gemt i SSTables, men giver information via API (ydelsesmetrikker, konfigurationsoplysninger, cacheindhold, oplysninger om tilsluttede klienter osv.), er tilf\u00f8jet.\n<li class=\"l\"> Effektiviteten af datalagring i komprimeret form er forbedret, hvilket reducerer diskpladsforbruget og \u00f8ger l\u00e6seoperationernes ydeevne.\n<li class=\"l\"> Data relateret til systemn\u00f8gleomr\u00e5det (system.*) placeres nu som standard i den f\u00f8rste mappe, i stedet for at blive fordelt over alle datamapper, hvilket sikrer, at noden forbliver operational, selv hvis en af de ekstra diske fejler.\n<li class=\"l\"> Eksperimentel st\u00f8tte til midlertidig replikation (Transient Replication) og lette quorum (Cheap Quorums) er blevet tilf\u00f8jet. Midlertidige replikater gemmer ikke alle data og bruger inkrementel genopretning for at synkronisere med fulde replikater. Lettere quorum implementerer optimering af skriveoperationer, hvor der ikke skrives til midlertidige replikater, f\u00f8r et tilstr\u00e6kkeligt antal fulde replikater er tilg\u00e6ngelige.\n<li class=\"l\"> Eksperimentel st\u00f8tte til Java 11 er blevet tilf\u00f8jet.\n<li class=\"l\"> Ekstra funktion til sammenligning af alle Merkle-tr\u00e6er (Merkle Tree) er blevet tilf\u00f8jet. For eksempel vil aktivering af funktionen p\u00e5 et cluster med 3 noder, hvor to replikater er ens, og en er for\u00e6ldet, f\u00f8re til, at den for\u00e6ldede replika opdateres ved kun at bruge \u00e9n kopioperation af den aktuelle replika.\n<li class=\"l\"> Nye funktioner currentTimestamp, currentDate, currentTime og currentTimeUUID er blevet tilf\u00f8jet.\n<li class=\"l\"> St\u00f8tte til aritmetiske operationer i CQL-foresp\u00f8rgsler er blevet tilf\u00f8jet.\n<li class=\"l\"> The ability to perform arithmetic operations between data types &#171;timestamp&#187;\/&#171;date&#187; and &#171;duration&#187; has been provided.\n<li class=\"l\"> A mode for previewing the data streams necessary for recovery has been added (nodetool repair &#8212;preview), along with an option to check the integrity of the data being recovered (nodetool repair &#8212;validate).\n<li class=\"l\"> I SELECT-foresp\u00f8rgsler er det nu muligt at behandle elementer i Map og Set.\n<li class=\"l\"> St\u00f8tte til parallelisering af den indledende byggefase af materialiserede visninger (cassandra.yaml:concurrent_materialized_view_builders) er blevet tilf\u00f8jet.\n<li class=\"l\"> I teamet &#171;nodetool cfstats&#187; er der tilf\u00f8jet support til sortering efter specifikke m\u00e5linger og begr\u00e6nsning af antallet af viste linjer.\n<li class=\"l\"> Der er blevet givet indstillinger for at begr\u00e6nse brugerens forbindelse kun til bestemte datacentre.\n<li class=\"l\"> Mulighed for at begr\u00e6nse intensiteten (rate limit) af oprettelses- og rydningsoperationer p\u00e5 snapshots er blevet tilf\u00f8jet.\n<li class=\"l\"> I cqlsh og cqlshlib er st\u00f8tte til Python 3 blevet implementeret (st\u00f8tte til Python 2.7 er stadig bevaret).\n<li class=\"l\"> St\u00f8tte til Windows-platformen er blevet oph\u00e6vet. For at k\u00f8re Cassandra p\u00e5 Windows anbefales det at bruge Linux-milj\u00f8er baseret p\u00e5 WSL2 (Windows Subsystem for Linux 2) eller virtualiseringssystemer.      <\/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=\"Afspil 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 \/>Kilde: <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 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