{"id":54919,"date":"2020-01-08T00:00:00","date_gmt":"2020-01-07T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki"},"modified":"2020-02-18T14:02:59","modified_gmt":"2020-02-18T11:02:59","slug":"vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki","title":{"rendered":"A m\u00e1sodik jel\u00f6lt a libmdbx v1.0 kiad\u00e1sra \u00f6t \u00e9v fejleszt\u00e9s ut\u00e1n.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <\/p>\n<p>K\u00f6nyvt\u00e1r <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\">libmdbx<\/a> l\u00e9nyegesen \u00e1tdolgozott ut\u00f3dja az LMDB-nek \u2014 rendk\u00edv\u00fcl magas teljes\u00edtm\u00e9ny\u0171, kompakt be\u00e1gyazott kulcs-\u00e9rt\u00e9k adatb\u00e1zisnak.<\/noindex><br \/>\nA jelenlegi v0.5-\u00f6s verzi\u00f3 technikai kiad\u00e1s, amely a finomhangol\u00e1sok befejez\u00e9s\u00e9t \u00e9s az \u00e1llami v\u00e9gs\u0151 tesztel\u00e9s \u00e9s stabiliz\u00e1l\u00e1s f\u00e1zis\u00e1ba val\u00f3 \u00e1tmenetet jelzi, majd az els\u0151 teljes kiad\u00e1s\u00e1nak kialakul\u00e1s\u00e1hoz vezet.<\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/ru.bmstu.wiki\/LMDB_(Lightning_Memory-Mapped_Database)\">LMDB<\/a> elegend\u0151en ismert tranzakcion\u00e1lis be\u00e1gyazott DBMS kulcs-\u00e9rt\u00e9k alapon <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/B%E2%81%BA-%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE\">B+ f\u00e1nak<\/a> n\u00e9lk\u00fcl <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A3%D0%BF%D1%80%D0%B5%D0%B6%D0%B4%D0%B0%D1%8E%D1%89%D0%B0%D1%8F_%D0%B6%D1%83%D1%80%D0%BD%D0%B0%D0%BB%D0%B8%D0%B7%D0%B0%D1%86%D0%B8%D1%8F\">el\u0151zetes napl\u00f3z\u00e1s<\/a>, amely lehet\u0151v\u00e9 teszi egy csoport p\u00e1rhuzamos folyamatainak versenyszer\u0171 \u00e9s rendk\u00edv\u00fcl hat\u00e9kony munk\u00e1j\u00e1t helyi megosztott (nem h\u00e1l\u00f3zati) adatb\u00e1zisokkal. Ezzel szemben az MDBX gyorsabb \u00e9s megb\u00edzhat\u00f3bb az LMDB-n\u00e9l, mik\u00f6zben a libmdbx meg\u0151rzi el\u0151d\u00e9nek minden kulcsfontoss\u00e1g\u00fa lehet\u0151s\u00e9g\u00e9t, mint p\u00e9ld\u00e1ul <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/ACID\">ACID<\/a> \u00e9s blokkol\u00e1s n\u00e9lk\u00fcli olvas\u00e1s line\u00e1ris sk\u00e1l\u00e1zhat\u00f3s\u00e1ggal a CPU magok k\u00f6z\u00f6tt, \u00e9s n\u00e9h\u00e1ny \u00faj funkci\u00f3t is hozz\u00e1ad.<\/p>\n<p><\/noindex><\/p>\n<p>A libmdbx \u00e9s LMDB k\u00f6z\u00f6tti k\u00fcl\u00f6nbs\u00e9gek \u00e9s fejleszt\u00e9sek le\u00edr\u00e1sa k\u00fcl\u00f6n cikket \u00e9rdemel (tervbe van v\u00e9ve publik\u00e1ci\u00f3 a \u201eHabr\u201d \u00e9s a \u201eMedium\u201d platformokon). Itt \u00e9rdemes eml\u00edteni a legfontosabb \u00e9s legfigyelemrem\u00e9lt\u00f3bbakat:<\/p>\n<ul>\n<li>Elvileg t\u00f6bb figyelmet ford\u00edtanak a k\u00f3d min\u0151s\u00e9g\u00e9re, tesztel\u00e9sre \u00e9s automatikus ellen\u0151rz\u00e9sekre.<\/li>\n<li>Jelent\u0151sen nagyobb kontroll a munka sor\u00e1n, az param\u00e9terek ellen\u0151rz\u00e9s\u00e9t\u0151l kezdve a bels\u0151 adatb\u00e1zis strukt\u00far\u00e1k audit\u00e1l\u00e1s\u00e1ig.<\/li>\n<li>Automatikus t\u00f6m\u00f6r\u00edt\u00e9s \u00e9s az adatb\u00e1zis m\u00e9ret\u00e9nek automatikus kezel\u00e9se.<\/li>\n<li>Egys\u00e9ges adatb\u00e1zis form\u00e1tum 32 bites \u00e9s 64 bites build-ekhez.<\/li>\n<li>A tartom\u00e1nyok (range query) alapj\u00e1n a lek\u00e9rdez\u00e9sek mennyis\u00e9g\u00e9nek becsl\u00e9se.<\/li>\n<li>A felhaszn\u00e1l\u00f3 \u00e1ltal v\u00e1laszthat\u00f3 adatb\u00e1zis m\u00e9ret k\u00e9tszeres kulcs t\u00e1mogat\u00e1sa.<\/li>\n<\/ul>\n<p>A kiadott libmdbx kiad\u00e1s-jel\u00f6lt annak a d\u00f6nt\u00e9snek az eredm\u00e9nye (l\u00e1sd k\u00e9s\u0151bb), amely az MDBX \u00e9s MithrilDB projektek sz\u00e9tv\u00e1laszt\u00e1s\u00e1r\u00f3l sz\u00f3l 2019 augusztus\u00e1ban. Ennek sor\u00e1n a libmdbx-ben elt\u00e1vol\u00edt\u00e1sra ker\u00fclt (racionaliz\u00e1lt) a technikai ad\u00f3ss\u00e1gok maximuma \u00e9s a k\u00f6nyvt\u00e1r stabiliz\u00e1l\u00e1sa. A megc\u00e9lzott ir\u00e1nyvonalban a t\u00e9nyek szerint 2-3-szor t\u00f6bbet tettek, mint amennyit kezdetben \u00e9rt\u00e9keltek \u00e9s terveztek:<\/p>\n<ul>\n<li>Mac OS \u00e9s a \u201em\u00e1sodik vonal\u201d platformok, mint a FreeBSD, Solaris, DragonFly BSD, OpenBSD, NetBSD t\u00e1mogat\u00e1sa val\u00f3sult meg. Az AIX \u00e9s HP-UX t\u00e1mogat\u00e1sa sz\u00fcks\u00e9g eset\u00e9n hozz\u00e1adhat\u00f3.<\/li>\n<li>A k\u00f3d karbantart\u00e1s\u00e1t az Undefined Behavior Sanitizer \u00e9s az Address Sanitizer seg\u00edts\u00e9g\u00e9vel hajtott\u00e1k v\u00e9gre, a -Wpedantic opci\u00f3val v\u00e9gzett ford\u00edt\u00e1s sor\u00e1n minden figyelmeztet\u00e9st megsz\u00fcntettek, a Coverity Static Analyzer \u00e9s egy\u00e9b figyelmeztet\u00e9seket is.<\/li>\n<li>Friss\u00edt\u00e9s <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/blob\/master\/mdbx.h\">API le\u00edr\u00e1sa<\/a>.<\/li>\n<li>A forr\u00e1sk\u00f3d amalg\u00e1m\u00e1ci\u00f3ja a be\u00e1gyaz\u00e1s megk\u00f6nny\u00edt\u00e9se \u00e9rdek\u00e9ben.<\/li>\n<li>CMake t\u00e1mogat\u00e1s.<\/li>\n<li>Be\u00e1gyazott tranzakci\u00f3k t\u00e1mogat\u00e1sa.<\/li>\n<li>A bootid haszn\u00e1lata az oper\u00e1ci\u00f3s rendszer \u00fajraind\u00edt\u00e1s\u00e1nak (az adatb\u00e1zis piszkos le\u00e1ll\u00edt\u00e1sa) \u00e9szlel\u00e9s\u00e9re.<\/li>\n<li>Friss\u00edtett\/\u00f6reg oldalakat fel\u00f6lel\u0151 sz\u00e1ml\u00e1l\u00e1s \u00e9s kib\u0151v\u00edtett inform\u00e1ci\u00f3 a tranzakci\u00f3kr\u00f3l.<\/li>\n<li>MDBX_ACCEDE opci\u00f3 az m\u00e1r megnyitott adatb\u00e1zishoz val\u00f3 csatlakoz\u00e1shoz kompatibilis m\u00f3dban.<\/li>\n<li>Haszn\u00e1lat <a rel=\"nofollow\" href=\"https:\/\/www.gnu.org\/software\/libc\/manual\/html_node\/Open-File-Description-Locks.html\">OFD z\u00e1rol\u00e1sok<\/a> azok el\u00e9rhet\u0151s\u00e9ge eset\u00e9n.<\/li>\n<li>Forr\u00f3 biztons\u00e1gi ment\u00e9s pipe-on kereszt\u00fcl.<\/li>\n<li>Specializ\u00e1lt optimaliz\u00e1lt bels\u0151 rendez\u00e9si algoritmus (2-3x gyorsabb a qsort()-n\u00e1l \u00e9s ak\u00e1r 30%-kal gyorsabb a std::sort()-n\u00e1l).<\/li>\n<li>N\u00f6velt kulcshossz maximum.<\/li>\n<li>Automatikus read ahead vez\u00e9rl\u00e9s (a DB f\u00e1jlok mem\u00f3ri\u00e1ban val\u00f3 gyors\u00edt\u00f3t\u00e1raz\u00e1si strat\u00e9gi\u00e1ja).<\/li>\n<li>Aggressz\u00edvebb \u00e9s gyorsabb automatikus t\u00f6m\u00f6r\u00edt\u00e9s.<\/li>\n<li>Optim\u00e1lisabb B+ fa lapok egyes\u00edt\u00e9si strat\u00e9gi\u00e1ja.<\/li>\n<li>Nem helyi f\u00e1jlrendszerek (NFS, Samba stb.) ellen\u0151rz\u00e9se, hogy megakad\u00e1lyozza az adatb\u00e1zis s\u00e9r\u00fcl\u00e9s\u00e9t helytelen haszn\u00e1lat eset\u00e9n.<\/li>\n<li>Kib\u0151v\u00edtett tesztk\u00e9szlet.<\/li>\n<\/ul>\n<p><noindex><\/p>\n<p>A \"k\u00f6vetkez\u0151\" libmdbx verzi\u00f3 fejleszt\u00e9se egy k\u00fcl\u00f6n projekt keretein bel\u00fcl folytat\u00f3dik <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/MithrilDB\">MithrilDB<\/a>, m\u00edg a \"jelenlegi\" MDBX verzi\u00f3 fejleszt\u00e9si ir\u00e1nya a k\u00e9pess\u00e9gek le\u00e1ll\u00edt\u00e1s\u00e1ra \u00e9s stabiliz\u00e1l\u00e1s\u00e1ra \u00f6sszpontos\u00edt. E d\u00f6nt\u00e9s h\u00e1rom okb\u00f3l sz\u00fcletett:<\/p>\n<p><\/noindex><\/p>\n<ul>\n<li>Teljes inkompatibilit\u00e1s: a MithrilDB \u00f6sszes tervezett k\u00e9pess\u00e9g\u00e9nek megval\u00f3s\u00edt\u00e1s\u00e1hoz k\u00fcl\u00f6n (nem kompatibilis) DB f\u00e1jlform\u00e1tumra \u00e9s m\u00e1s (nem kompatibilis) API-ra van sz\u00fcks\u00e9g.<\/li>\n<li>\u00daj forr\u00e1sk\u00f3d: a MithrilDB forr\u00e1sk\u00f3dja biztos\u00edtja a LMDB f\u00fcggetlens\u00e9get, \u00e9s mag\u00e1t a projektet m\u00e1s (j\u00f3v\u00e1hagyott) licencek alatt tervezik k\u00f6zz\u00e9tenni. <a rel=\"nofollow\" href=\"https:\/\/opensource.org\/\">OSI<\/a> licenc <a rel=\"nofollow\" href=\"https:\/\/opensource.org\/licenses\/Apache-2.0\">Apache 2.0<\/a>, nem pedig <a rel=\"nofollow\" href=\"https:\/\/www.openldap.org\/software\/release\/license.html\">OpenLDAP Foundation<\/a>).<\/li>\n<li>A sz\u00e9tv\u00e1laszt\u00e1s lehet\u0151v\u00e9 teszi a potenci\u00e1lis z\u0171rzavar elker\u00fcl\u00e9s\u00e9t, a nagyobb vil\u00e1goss\u00e1got \u00e9s a projektek fejl\u0151d\u00e9si \u00fatj\u00e1nak f\u00fcggetlens\u00e9g\u00e9t.<\/li>\n<\/ul>\n<p><noindex><\/p>\n<p>A MithrilDB, ak\u00e1rcsak az MDBX, szint\u00e9n a <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/B%E2%81%BA-%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE\">B+ f\u00e1ra<\/a> \u00e9p\u00fcl, mik\u00f6zben rendk\u00edv\u00fcl magas teljes\u00edtm\u00e9nyt biztos\u00edt, megsz\u00fcntetve az MDBX \u00e9s LMDB sz\u00e1mos alapvet\u0151 h\u00e1tr\u00e1ny\u00e1t. K\u00fcl\u00f6n\u00f6sen megsz\u0171nik a \"hossz\u00fa olvas\u00e1sok\" probl\u00e9m\u00e1ja, amely az adatb\u00e1zis \"megn\u00f6veked\u00e9s\u00e9t\" okozza, mivel a szem\u00e9t \u00fajrafeldolgoz\u00e1sa hossz\u00fa olvas\u00f3 tranzakci\u00f3k miatt blokkolva van. A MithrilDB \u00faj lehet\u0151s\u00e9gei k\u00f6z\u00e9 tartozik:<\/p>\n<p><\/noindex><\/p>\n<ul>\n<li>t\u00e1mogat\u00e1s t\u00f6bbf\u00e9le t\u00e1rol\u00f3n t\u00f6rt\u00e9n\u0151 adatb\u00e1zis elhelyez\u00e9s\u00e9re: HDD, SSD \u00e9s nem volatilis mem\u00f3ria.<\/li>\n<li>optim\u00e1lis strat\u00e9gi\u00e1k a \"\u00e9rt\u00e9kes\" \u00e9s \"kev\u00e9sb\u00e9 \u00e9rt\u00e9kes\", a \"forr\u00f3\", \"meleg\" \u00e9s \"hideg\" adatok sz\u00e1m\u00e1ra.<\/li>\n<li>Merkle fa haszn\u00e1lata az adatb\u00e1zis integrit\u00e1s\u00e1nak ellen\u0151rz\u00e9s\u00e9re.<\/li>\n<li>opcion\u00e1lis WAL haszn\u00e1lata \u00e9s jelent\u0151sen magasabb teljes\u00edtm\u00e9ny az intenz\u00edv \u00edr\u00e1si forgat\u00f3k\u00f6nyvekben \u00e9s az adatintegrit\u00e1s garanci\u00e1ival.<\/li>\n<li>lusta ut\u00f3lagos adatment\u00e9s a lemezeken.<\/li>\n<\/ul>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/opensource\/15450965\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 libmdbx \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u0442\u043e\u043c\u043a\u043e\u043c LMDB \u2014 \u043f\u0440\u0435\u0434\u0435\u043b\u044c\u043d\u043e \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439, \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0439 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0431\u0430\u0437\u043e\u0439 \u0434\u0430\u043d\u043d\u044b\u0445 \u043a\u043b\u0430\u0441\u0441\u0430 \u043a\u043b\u044e\u0447-\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u0422\u0435\u043a\u0443\u0449\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f v0.5 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u0440\u0435\u043b\u0438\u0437\u043e\u043c, \u043e\u0442\u043c\u0435\u0447\u0430\u0435\u0442 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0435 \u043a\u0430\u043a\u0438\u0445-\u043b\u0438\u0431\u043e \u0434\u043e\u0440\u0430\u0431\u043e\u0442\u043e\u043a \u0438 \u043f\u0435\u0440\u0435\u0445\u043e\u0434 \u043a \u0444\u0430\u0437\u0435 \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u043e\u0433\u043e \u0444\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0430\u0446\u0438\u0438, \u0441 \u043f\u043e\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043f\u0435\u0440\u0432\u043e\u0433\u043e \u043f\u043e\u043b\u043d\u043e\u0446\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u0435\u043b\u0438\u0437\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438. LMDB \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0439 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0421\u0423\u0411\u0414 \u043a\u043b\u0430\u0441\u0441\u0430 \u00ab\u043a\u043b\u044e\u0447-\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u00bb \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0434\u0435\u0440\u0435\u0432\u0430 B+ [&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-54919","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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