{"id":83153,"date":"2020-05-29T01:42:10","date_gmt":"2020-05-28T23:42:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-raspredelyonnoj-subd-tidb-4-0"},"modified":"2020-05-29T01:42:10","modified_gmt":"2020-05-28T23:42:10","slug":"vypusk-raspredelyonnoj-subd-tidb-4-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-raspredelyonnoj-subd-tidb-4-0","title":{"rendered":"A TiDB 4.0 elosztott rendszer kiad\u00e1sa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/releases\/tag\/v4.0.0\">El\u00e9rhet\u0151<\/a><\/noindex> az elosztott adatb\u00e1zis-kezel\u0151 rendszer kiad\u00e1sa <noindex><a rel=\"nofollow\" href=\"https:\/\/pingcap.com\/index\">TiDB 4.0<\/a><\/noindex>, amelyet a Google <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/archive\/spanner.html\">Spanner<\/a><\/noindex> \u00e9s <noindex><a rel=\"nofollow\" href=\"http:\/\/research.google.com\/pubs\/pub38125.html\">F1<\/a><\/noindex>technol\u00f3gi\u00e1i inspir\u00e1ltak. A TiDB hibrid HTAP (Hybrid Transactional\/Analytical Processing) rendszerek k\u00f6z\u00e9 tartozik, amelyek k\u00e9pesek val\u00f3s idej\u0171 tranzakci\u00f3k (OLTP) v\u00e9grehajt\u00e1s\u00e1ra, valamint analitikai lek\u00e9rdez\u00e9sek feldolgoz\u00e1s\u00e1ra. A projekt Go nyelven k\u00e9sz\u00fclt, \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\">terjeszt\u00e9sre ker\u00fcl<\/a><\/noindex> Apache 2.0 licenc alatt.<\/p>\n<p>A TiDB jellemz\u0151i:\n<\/p>\n<ul>\n<li class=\"l\"> SQL t\u00e1mogat\u00e1s \u00e9s MySQL protokoll kompatibilis kliens interf\u00e9sz biztos\u00edt\u00e1sa, ami megk\u00f6nny\u00edti a megl\u00e9v\u0151 MySQL alkalmaz\u00e1sok TiDB-re val\u00f3 \u00e1t\u00e1ll\u00edt\u00e1s\u00e1t, valamint lehet\u0151v\u00e9 teszi a n\u00e9pszer\u0171 kliens k\u00f6nyvt\u00e1rak haszn\u00e1lat\u00e1t. A MySQL protokoll mellett JSON alap\u00fa API \u00e9s Spark csatlakoz\u00f3 is haszn\u00e1lhat\u00f3 az adatb\u00e1zishoz val\u00f3 hozz\u00e1f\u00e9r\u00e9shez.\n<\/li>\n<li class=\"l\"> SQL lehet\u0151s\u00e9gek k\u00f6z\u00e9 tartozik az indexek, aggreg\u00e1l\u00f3 f\u00fcggv\u00e9nyek, GROUP BY, ORDER BY, DISTINCT, egyes\u00edt\u00e9sek (LEFT JOIN \/ RIGHT JOIN \/ CROSS JOIN), n\u00e9zetek, ablakos f\u00fcggv\u00e9nyek \u00e9s be\u00e1gyazott lek\u00e9rdez\u00e9sek t\u00e1mogat\u00e1sa. Az el\u00e9rhet\u0151 funkci\u00f3k elegend\u0151ek olyan webalkalmaz\u00e1sok, mint a PhpMyAdmin, <noindex><a rel=\"nofollow\" href=\"https:\/\/gogs.io\/\">Gogs<\/a><\/noindex> \u00e9s WordPress megfelel\u0151 m\u0171k\u00f6d\u00e9s\u00e9hez;\n<\/li>\n<li class=\"l\"> A v\u00edzszintes sk\u00e1l\u00e1z\u00e1s \u00e9s a hibamentess\u00e9g lehet\u0151s\u00e9ge: a t\u00e1rol\u00e1si kapacit\u00e1s \u00e9s a sz\u00e1m\u00edt\u00e1si teljes\u00edtm\u00e9ny \u00faj csom\u00f3pontok egyszer\u0171 csatlakoztat\u00e1s\u00e1val n\u00f6velhet\u0151. Az adatok redundanci\u00e1val oszlanak el a csom\u00f3pontok k\u00f6z\u00f6tt, lehet\u0151v\u00e9 t\u00e9ve a m\u0171k\u00f6d\u00e9s folytat\u00e1s\u00e1t az egyes csom\u00f3pontok meghib\u00e1sod\u00e1sa eset\u00e9n. A meghib\u00e1sod\u00e1sok automatikusan kezelhet\u0151k.\n<\/li>\n<li class=\"l\"> A rendszer garant\u00e1lja a konzisztenci\u00e1t, \u00e9s az \u00fcgyf\u00e9lszoftver sz\u00e1m\u00e1ra \u00fagy t\u0171nik, mint egy nagy adatb\u00e1zis, annak ellen\u00e9re, hogy val\u00f3j\u00e1ban a tranzakci\u00f3k v\u00e9grehajt\u00e1s\u00e1hoz t\u00f6bb csom\u00f3pont adatait vonj\u00e1k be.\n<\/li>\n<li class=\"l\"> A csom\u00f3pontok fizik\u00e1lis adatt\u00e1rol\u00e1s\u00e1hoz k\u00fcl\u00f6nb\u00f6z\u0151 h\u00e1tt\u00e9rmegold\u00e1sok alkalmazhat\u00f3k, p\u00e9ld\u00e1ul a GoLevelDB \u00e9s BoltDB helyi t\u00e1rol\u00f3 motorok, vagy a saj\u00e1t elosztott t\u00e1rol\u00f3rendszerek, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tikv\">TiKV<\/a><\/noindex> \u00e9s TiFlash. A TiKV sorokban t\u00e1rolja az adatokat kulcs\/\u00e9rt\u00e9k form\u00e1tumban, \u00e9s optim\u00e1lisabb a tranzakci\u00f3s feldolgoz\u00e1si feladatokhoz (OLTP). A TiFlash oszlopalap\u00fa t\u00e1rol\u00e1st biztos\u00edt, amely lehet\u0151v\u00e9 teszi a nagyobb teljes\u00edtm\u00e9ny el\u00e9r\u00e9s\u00e9t analitikai feladatok (OLAP) sor\u00e1n.\n<\/li>\n<li class=\"l\"> Az adatt\u00e1rol\u00e1si s\u00e9ma aszinkron m\u00f3dos\u00edt\u00e1s\u00e1nak lehet\u0151s\u00e9ge, amely lehet\u0151v\u00e9 teszi oszlopok \u00e9s indexek \u00e9l\u0151 hozz\u00e1ad\u00e1s\u00e1t a jelenlegi m\u0171veletek le\u00e1ll\u00edt\u00e1sa n\u00e9lk\u00fcl.\n<\/li>\n<\/ul>\n<p>Az \u00faj kiad\u00e1sban:<\/p>\n<ul>\n<li class=\"l\"> Alap\u00e9rtelmez\u00e9s szerint enged\u00e9lyezve van a Green GC elosztott szem\u00e9tgy\u0171jt\u0151je, amely jelent\u0151sen n\u00f6veli a szem\u00e9tgy\u0171jt\u00e9s sebess\u00e9g\u00e9t nagy klaszterekben \u00e9s jav\u00edtja a stabilit\u00e1s m\u0171k\u00f6d\u00e9s\u00e9t;\n<li class=\"l\">Hozz\u00e1adva a nagy tranzakci\u00f3k t\u00e1mogat\u00e1sa, melynek m\u00e9ret\u00e9t gyakorlatilag a fizikai mem\u00f3ria m\u00e9rete korl\u00e1tozza. Az egy tranzakci\u00f3 m\u00e9ret\u00e9re vonatkoz\u00f3 korl\u00e1toz\u00e1s 100 MB-r\u00f3l 10 GB-ra n\u00f6velve;\n<li class=\"l\"> Hozz\u00e1adva a BACKUP \u00e9s RESTORE parancsok t\u00e1mogat\u00e1sa a biztons\u00e1gi ment\u00e9sekhez;\n<li class=\"l\"> Hozz\u00e1adva a t\u00e1bl\u00e1k lez\u00e1r\u00e1s\u00e1nak lehet\u0151s\u00e9ge;\n<li class=\"l\"> Hozz\u00e1adva a MySQL kompatibilis tranzakci\u00f3s izol\u00e1ci\u00f3s mechanizmus olvas\u00e1si szinten (READ COMMITTED);\n<li class=\"l\"> Az \u201eADMIN SHOW DDL JOBS\u201d parancsba hozz\u00e1adva a LIKE \u00e9s WHERE kifejez\u00e9sek t\u00e1mogat\u00e1sa.\n<li class=\"l\"> Hozz\u00e1adva az oom-use-tmp-storage param\u00e9ter, amely lehet\u0151v\u00e9 teszi ideiglenes f\u00e1jlok haszn\u00e1lat\u00e1t a k\u00f6ztes eredm\u00e9nyek gyors\u00edt\u00f3t\u00e1raz\u00e1s\u00e1ra, ha a mem\u00f3riakapacit\u00e1s hi\u00e1nyzik;\n<li class=\"l\"> Hozz\u00e1adva a Random kulcssz\u00f3, amely lehet\u0151v\u00e9 teszi a v\u00e9letlenszer\u0171 \u00e9rt\u00e9kek hozz\u00e1rendel\u00e9s\u00e9t a tulajdons\u00e1gokhoz;\n<li class=\"l\"> A LOAD DATA parancsban lehet\u0151s\u00e9g ny\u00edlt hexadecim\u00e1lis \u00e9s bin\u00e1ris kifejez\u00e9sek haszn\u00e1lat\u00e1ra;\n<li class=\"l\"> Hozz\u00e1adva 15 param\u00e9ter az optimaliz\u00e1l\u00f3 viselked\u00e9s\u00e9nek ir\u00e1ny\u00edt\u00e1s\u00e1hoz;\n<li class=\"l\"> Hozz\u00e1adva az SQL-lek\u00e9rdez\u00e9sek teljes\u00edtm\u00e9ny\u00e9nek diagnosztiz\u00e1l\u00e1s\u00e1ra szolg\u00e1l\u00f3 eszk\u00f6z\u00f6k. Hozz\u00e1adva a lass\u00fa lek\u00e9rdez\u00e9sek napl\u00f3ja, amely el\u00e9rhet\u0151 a SLOW_QUERY \/ CLUSTER_SLOW_QUERY rendszer t\u00e1bl\u00e1kon kereszt\u00fcl;\n<li class=\"l\"> Hozz\u00e1adva a sorozatok kezel\u00e9s\u00e9re szolg\u00e1l\u00f3 f\u00fcggv\u00e9nyek t\u00e1mogat\u00e1sa;\n<li class=\"l\"> Be\u00e9p\u00edtett lehet\u0151s\u00e9g a konfigur\u00e1ci\u00f3s param\u00e9terek dinamikus m\u00f3dos\u00edt\u00e1s\u00e1ra, amelyek a PD-b\u0151l (Placement Driver, a klaszterkezel\u0151 szerver) olvashat\u00f3k. Hozz\u00e1adva a \u201eSET CONFIG\u201d kifejez\u00e9s haszn\u00e1lat\u00e1nak lehet\u0151s\u00e9ge a PD\/TiKV csom\u00f3pontok be\u00e1ll\u00edt\u00e1sainak megv\u00e1ltoztat\u00e1s\u00e1ra.\n<li class=\"l\"> Hozz\u00e1adva a max-server-connections be\u00e1ll\u00edt\u00e1s a maxim\u00e1lis egyidej\u0171 kapcsolatok sz\u00e1m\u00e1nak korl\u00e1toz\u00e1s\u00e1ra a szerverhez (alap\u00e9rtelmezett 4096);\n<li class=\"l\"> N\u00f6velve a teljes\u00edtm\u00e9nyt olyan helyzetekben, amikor a k\u00e9rt oszlopok teljes m\u00e9rt\u00e9kben lefedik az indexeket;\n<li class=\"l\"> Hozz\u00e1adva az indexek egyes\u00edt\u00e9s\u00e9nek alapjaira \u00e9p\u00fcl\u0151 lek\u00e9rdez\u00e9s-optimaliz\u00e1ci\u00f3;\n<li class=\"l\"> N\u00f6velve a teljes\u00edtm\u00e9ny a tartom\u00e1ny\u00e9rt\u00e9kekkel v\u00e9gzett m\u0171veletek sor\u00e1n;\n<li class=\"l\"> Cs\u00f6kkentve a CPU terhel\u00e9st az indexekhez val\u00f3 hozz\u00e1f\u00e9r\u00e9s eredm\u00e9nyeinek gyors\u00edt\u00f3t\u00e1raz\u00e1sa \u00e9s a duplik\u00e1tumok kisz\u0171r\u00e9se r\u00e9v\u00e9n;\n<li class=\"l\"> Hozz\u00e1adva egy \u00faj sorform\u00e1tum t\u00e1mogat\u00e1sa, amely lehet\u0151v\u00e9 teszi a nagy oszlopsz\u00e1m\u00fa t\u00e1bl\u00e1k teljes\u00edtm\u00e9ny\u00e9nek n\u00f6vel\u00e9s\u00e9t;\n<li class=\"l\"> A GROUP_CONCAT funkci\u00f3ban megjelent az \u201eORDER BY\u201d kifejez\u00e9s t\u00e1mogat\u00e1sa.\n<li class=\"l\"> Hozz\u00e1adva az adatok kinyer\u00e9s\u00e9nek lehet\u0151s\u00e9ge a TiFlash napl\u00f3b\u00f3l SQL-en kereszt\u00fcl;\n<li class=\"l\"> A \u201eRECOVER TABLE\u201d parancsban megval\u00f3sult a lev\u00e1gott t\u00e1bl\u00e1k helyre\u00e1ll\u00edt\u00e1si t\u00e1mogat\u00e1sa.\n<li class=\"l\"> Hozz\u00e1adva a DDLJobs rendszer t\u00e1bl\u00e1t a DDL feladatok v\u00e9grehajt\u00e1s\u00e1nak r\u00e9szleteinek k\u00e9r\u00e9s\u00e9re;\n<li class=\"l\"> Hozz\u00e1adva a SHOW CONFIG parancs alkalmaz\u00e1s\u00e1nak lehet\u0151s\u00e9ge a PD \u00e9s TiKV be\u00e1ll\u00edt\u00e1sainak megjelen\u00edt\u00e9s\u00e9re;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pingcap\/tidb\/pull\/16710\">Bekapcsolva<\/a><\/noindex>  alap\u00e9rtelmez\u00e9s szerint a t\u00e1rhelykooper\u00e1l\u00f3 gyors\u00edt\u00f3t\u00e1r;\n<li class=\"l\"> A visszaigazolt elj\u00e1r\u00e1sok (goroutine) sz\u00e1ma mostant\u00f3l a committer-concurrency be\u00e1ll\u00edt\u00e1ssal vez\u00e9relhet\u0151;\n<li class=\"l\"> Hozz\u00e1adva a t\u00e1bl\u00e1k part\u00edci\u00f3inak t\u00e9rs\u00e9geinek megjelen\u00edt\u00e9s\u00e9nek lehet\u0151s\u00e9ge;\n<li class=\"l\"> A tidb-server-ben hozz\u00e1adva a kik\u00e9pz\u00e9si ideiglenes t\u00e1rol\u00f3 m\u00e9ret\u00e9nek korl\u00e1toz\u00e1s\u00e1nak lehet\u0151s\u00e9ge;\n<li class=\"l\"> Hozz\u00e1adva az \u201einsert into tbl_name partition(partition_name_list)\u201d \u00e9s a \u201ereplace into tbl_name partition(partition_name_list)\u201d m\u0171veletek t\u00e1mogat\u00e1sa.\n<li class=\"l\"> A part\u00edcion\u00e1l\u00e1sra haszn\u00e1lt hash-ben hozz\u00e1adva a \u201eis null\u201d felt\u00e9tel szerinti sz\u0171r\u00e9s t\u00e1mogat\u00e1sa.\n<li class=\"l\"> A szekcion\u00e1lt t\u00e1bl\u00e1khoz hozz\u00e1adva a lek\u00e9rdez\u00e9sek, tiszt\u00edt\u00e1sok \u00e9s indexek helyre\u00e1ll\u00edt\u00e1s\u00e1nak m\u0171veleteinek t\u00e1mogat\u00e1sa.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53045\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0421\u0423\u0411\u0414 TiDB 4.0, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u043e\u0434 \u0432\u043f\u0435\u0447\u0430\u0442\u043b\u0435\u043d\u0438\u0435\u043c \u043e\u0442 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439 Google Spanner \u0438 F1. TiDB \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u0438 \u0433\u0438\u0431\u0440\u0438\u0434\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c HTAP (Hybrid Transactional\/Analytical Processing), \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0445 \u043a\u0430\u043a \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0439 \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u043e\u043c \u0432\u0440\u0435\u043c\u0435\u043d\u0438 (OLTP), \u0442\u0430\u043a \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041f\u0440\u043e\u0435\u043a\u0442 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 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