{"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\/ro\/blog\/news\/dostupna-subd-apache-cassandra-4-0","title":{"rendered":"Este disponibil cadrul de gestionare a bazelor de date Apache Cassandra 4.0.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Organiza\u021bia Apache Software Foundation a lansat versiunea bazei de date distribuite Apache Cassandra 4.0, care face parte din categoria sistemelor noSQL \u0219i este destinat\u0103 cre\u0103rii de stoc\u0103ri scalabile \u0219i de \u00eencredere pentru cantit\u0103\u021bi mari de date, stocate sub form\u0103 de tablou asociativ (hash). Lansarea Cassandra 4.0 a fost recunoscut\u0103 ca fiind preg\u0103tit\u0103 pentru implement\u0103ri de produc\u021bie \u0219i a fost deja testat\u0103 \u00een infrastructurile companiilor Amazon, Apple, DataStax, Instaclustr, iland \u0219i Netflix cu clustere ce con\u021bin peste 1000 de noduri. Codul proiectului este scris \u00een limbajul Java \u0219i este distribuit sub licen\u021ba Apache 2.0.     <\/p>\n<p>Cassandra Database a fost ini\u021bial dezvoltat\u0103 de Facebook \u0219i \u00een 2009 a fost transferat\u0103 sub tutela fundatiei Apache. Solu\u021biile industriale bazate pe Cassandra sunt implementate pentru a sus\u021bine serviciile companiilor precum Apple, Adobe, CERN, Cisco, IBM, HP, Comcast, Disney, eBay, Huawei, Netflix, Sony, Rackspace, Reddit \u0219i Twitter. De exemplu, infrastructura de stocare dezvoltat\u0103 de Apple pe baza Apache Cassandra cuprinde peste o mie de clustere, incluz\u00e2nd 160.000 de noduri \u0219i stoc\u00e2nd peste 100 de petabyte de date. Compania Huawei utilizeaz\u0103 peste 300 de clustere Apache Cassandra, care includ 30.000 de noduri, iar Netflix dispune de peste 100 de clustere, acoperind 10.000 de noduri \u0219i proces\u00e2nd peste un trilion de cereri pe zi.     <\/p>\n<p>Cassandra Database combin\u0103 o sistem\u0103 hash complet distribuit\u0103, Dynamo, care asigur\u0103 scalabilitate aproape liniar\u0103 pe m\u0103sur\u0103 ce volumul de date cre\u0219te. Cassandra folose\u0219te un model de stocare a datelor bazat pe familiile de coloane (ColumnFamily), distinct de sistemele precum memcachedb, care stocheaz\u0103 datele doar \u00een combina\u021bii cheie\/valoare, av\u00e2nd capacitatea de a organiza stocarea hash-urilor cu mai multe niveluri de imbricare. Pentru a simplifica interac\u021biunea cu baza de date, este suportat limbajul pentru formarea de interog\u0103ri structurate CQL (Cassandra Query Language), care este similar cu SQL, dar cu func\u021bionalitate restr\u00e2ns\u0103. Printre posibilit\u0103\u021bile oferite se num\u0103r\u0103 suportul pentru spa\u021bii de nume \u0219i familii de coloane, precum \u0219i crearea de indec\u0219i prin expresia 'CREATE INDEX'.      <\/p>\n<p>Baza de date permite crearea de stoc\u0103ri rezistente la defec\u021biuni: datele introduse \u00een baza de date sunt replicate automat pe mai multe noduri ale re\u021belei distribuite, care poate acoperi diferite <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/kompaniya\/data-centers\/\"   title=\"centre de date\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4642\">centre de date<\/a>. \u00cen cazul unei defec\u021biuni a nodului, func\u021biile acestuia sunt preluate \u00een timp real de c\u0103tre alte noduri. Ad\u0103ugarea de noduri noi \u00een cluster \u0219i actualizarea versiunii Cassandra se realizeaz\u0103 \u00een timp real, f\u0103r\u0103 interven\u021bii manuale suplimentare \u0219i reconfirmarea altor noduri. Driverii cu suport CQL sunt preg\u0103ti\u021bi pentru limbile Python, Java (JDBC\/DBAPI2), Ruby, PHP, C++ \u0219i JavaScript (Node.js).        <\/p>\n<p>Nout\u0103\u021bi principale:   <\/p>\n<ul>\n<li class=\"l\"> Performan\u021ba \u0219i scalabilitatea au fost \u00eembun\u0103t\u0103\u021bite. Eficien\u021ba schimbului de date \u00een format SSTable (Sorted Strings Table) \u00eentre noduri a crescut. Protocolul de schimb de mesaje \u00eentre noduri (Internode Messaging Protocol) a fost optimizat. Viteza de transfer a fluxurilor de date \u00eentre noduri a crescut de p\u00e2n\u0103 la 5 ori (\u00een principal datorit\u0103 aplic\u0103rii tehnicii Zero Copy \u0219i transferului complet al SSTables), iar l\u0103\u021bimea de band\u0103 \u00een opera\u021biunile de citire \u0219i scriere a crescut cu p\u00e2n\u0103 la 25%. Procesul de restaurare incremental\u0103 a fost optimizat. \u00cent\u00e2rzierile cauzate de pauzele din activitatea colectorului de gunoi au fost reduse la c\u00e2teva milisecunde.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 suportul pentru jurnalul de audit, care permite urm\u0103rirea opera\u021biunilor de autentificare a utilizatorilor \u0219i a tuturor cererilor CQL efectuate.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 capacitatea de a men\u021bine un jurnal binar complet al cererilor, permi\u021b\u00e2nd salvarea \u00eentregului trafic de cereri \u0219i r\u0103spunsuri. Pentru gestionare, sunt propuse comenzile 'nodetool enablefullquerylog|disablefullquerylog|resetfullquerylog', iar pentru analiz\u0103 este furnizat\u0103 utilitarul fqltool. Sunt oferite comenzi pentru transformarea jurnalului \u00een form\u0103 citibil\u0103 (Dump), compararea secven\u021belor de activitate (Compare) \u0219i reexecutarea (Replay) pentru analiz\u0103 replic\u00e2nd condi\u021biile specifice unei sarcini reale.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 suportul pentru tabele virtuale, care reflect\u0103 nu datele stocate \u00een SSTables, ci informa\u021bii furnizate prin API (metrice de performan\u021b\u0103, informa\u021bii despre set\u0103ri, con\u021binutul cache-ului, date despre clien\u021bii conecta\u021bi etc.).\n<li class=\"l\"> Eficien\u021ba stoc\u0103rii datelor \u00een form\u0103 comprimat\u0103 a fost \u00eembun\u0103t\u0103\u021bit\u0103, ceea ce permite reducerea consumului de spa\u021biu pe disc \u0219i cre\u0219terea performan\u021bei opera\u021biunilor de citire.\n<li class=\"l\"> Datele referitoare la spa\u021biul de cheie de sistem (system.*) sunt acum \u00een mod implicit plasate \u00een prima directoare, \u00een loc de a fi distribuite \u00een toate directoarele cu date, ceea ce permite men\u021binerea func\u021bionalit\u0103\u021bii nodului \u00een cazul defect\u0103rii uneia dintre unit\u0103\u021bile suplimentare.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 suport experimental pentru replicarea temporar\u0103 (Transient Replication) \u0219i quorumuri u\u0219oare (Cheap Quorums). Replicile temporare nu stocheaz\u0103 toate datele \u0219i folosesc recuperarea incremental\u0103 pentru a se sincroniza cu replicile complete. Quorumurile u\u0219oare implementeaz\u0103 optimizarea opera\u021biunilor de scriere, prin care scrierea \u00een replicile temporare nu se efectueaz\u0103 p\u00e2n\u0103 c\u00e2nd un set suficient de replici complete nu este disponibil.\n<li class=\"l\"> A fost ad\u0103ugat suport experimental pentru Java 11.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 o op\u021biune experimental\u0103 pentru compararea tuturor arborilor Merkle (Merkle Tree). De exemplu, activarea op\u021biunii pe un cluster cu 3 noduri, \u00een care dou\u0103 replici sunt identice, iar una este \u00eenvechit\u0103, va duce la actualizarea replicii \u00eenvechite folosind doar o opera\u021biune de copiere a replicii actuale.\n<li class=\"l\"> Au fost ad\u0103ugate noi func\u021bii currentTimestamp, currentDate, currentTime \u0219i currentTimeUUID.\n<li class=\"l\"> A fost ad\u0103ugat suport pentru opera\u021bii aritmetice \u00een interog\u0103rile CQL.\n<li class=\"l\"> A fost oferit\u0103 posibilitatea de a efectua opera\u021biuni aritmetice \u00eentre date cu tipurile 'timestamp'\/'date' \u0219i 'duration'.\n<li class=\"l\"> A fost ad\u0103ugat un mod pentru previzualizarea fluxurilor de date necesare pentru restaurare (nodetool repair \u2014preview) \u0219i posibilitatea de a verifica integritatea datelor restaurate (nodetool repair \u2014validate).\n<li class=\"l\"> \u00cen interog\u0103rile SELECT a fost ad\u0103ugat\u0103 posibilitatea de a procesa elemente Map \u0219i Set.\n<li class=\"l\"> A fost ad\u0103ugat suport pentru paralelizarea etapei ini\u021biale de construire a vizualiz\u0103rilor materializate (cassandra.yaml:concurrent_materialized_view_builders).\n<li class=\"l\"> \u00cen echipa &#171;nodetool cfstats&#187; a fost ad\u0103ugat\u0103 suport pentru sortarea dup\u0103 anumite metrici \u0219i limitarea num\u0103rului de r\u00e2nduri afi\u0219ate.\n<li class=\"l\"> Au fost oferite set\u0103ri pentru a limita conexiunea utilizatorului doar la anumite centre de date.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 posibilitatea de a limita intensitatea (rate limit) opera\u021biunilor de creare \u0219i cur\u0103\u021bare a snapshot-urilor.\n<li class=\"l\"> \u00cen cqlsh \u0219i cqlshlib a fost implementat suport pentru Python 3 (suportul pentru Python 2.7 r\u0103m\u00e2ne disponibil).\n<li class=\"l\"> Suportul pentru platforma Windows a fost \u00eentrerupt. Pentru a rula Cassandra pe Windows, se recomand\u0103 utilizarea mediilor Linux create pe baza subsystemului WSL2 (Windows Subsystem for Linux 2) sau a sistemelor de virtualizare.      <\/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=\"Reda\u021bi 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 \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55561\">opennet.ro<\/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 5.0.2.1 - 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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