{"id":54906,"date":"2020-01-07T00:00:00","date_gmt":"2020-01-06T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/posle-pyati-let-razrabotki-opublikovan-vtoroj-kandidat-v-relizy-libmdbx-1-0"},"modified":"2020-02-18T14:02:58","modified_gmt":"2020-02-18T11:02:58","slug":"posle-pyati-let-razrabotki-opublikovan-vtoroj-kandidat-v-relizy-libmdbx-1-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/posle-pyati-let-razrabotki-opublikovan-vtoroj-kandidat-v-relizy-libmdbx-1-0","title":{"rendered":"Po p\u011bti letech v\u00fdvoje byl zve\u0159ejn\u011bn druh\u00fd release candidate verze libmdbx 1.0.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/releases\">Dostupn\u00e9<\/a><\/noindex> pro testov\u00e1n\u00ed druh\u00e9ho kandid\u00e1ta na vyd\u00e1n\u00ed knihovny <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\">libmdbx<\/a><\/noindex> s realizac\u00ed vysoce v\u00fdkonn\u00e9, kompaktn\u00ed vestav\u011bn\u00e9 datab\u00e1ze typu kl\u00ed\u010d-hodnota. Aktu\u00e1ln\u00ed verze (0.5) je technick\u00fdm vyd\u00e1n\u00edm, kter\u00e9 signalizuje dokon\u010den\u00ed jak\u00fdchkoli \u00faprav a p\u0159echod do f\u00e1ze ve\u0159ejn\u00e9ho fin\u00e1ln\u00edho testov\u00e1n\u00ed a stabilizace, s n\u00e1sledn\u00fdm vytvo\u0159en\u00edm prvn\u00edho plnohodnotn\u00e9ho vyd\u00e1n\u00ed knihovny. K\u00f3d libmdbx  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/\">distribuov\u00e1no<\/a><\/noindex> pod licenc\u00ed OpenLDAP Public License.<\/p>\n<p>Knihovna MDBX je podstatn\u011b p\u0159epracovanou odno\u017e\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/symas.com\/lmdb\/\">LMDB<\/a><\/noindex> \u2014 transak\u010dn\u00ed vestav\u011bn\u00e1 datab\u00e1zov\u00e1 S\u0158BD t\u0159\u00eddy \u201ekl\u00ed\u010d-hodnota\u201c zalo\u017een\u00e1 na <noindex><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+ stromu<\/a><\/noindex> bez <noindex><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\">v p\u0159edstihu zapisuj\u00edc\u00ed \u017eurn\u00e1ln\u00ed syst\u00e9m<\/a><\/noindex>, kter\u00e1 umo\u017e\u0148uje v\u00edcerozm\u011brn\u00fdm proces\u016fm konkurentn\u011b a efektivn\u011b pracovat s lok\u00e1ln\u011b sd\u00edlenou (ne s\u00ed\u0165ovou) DB. MDBX je rychlej\u0161\u00ed a spolehliv\u011bj\u0161\u00ed ne\u017e LMDB, a p\u0159itom si zachov\u00e1v\u00e1 v\u0161echny kl\u00ed\u010dov\u00e9 mo\u017enosti sv\u00e9ho p\u0159edch\u016fdce, jako jsou <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/ACID\">ACID<\/a><\/noindex> a nezablokovan\u00e9 \u010dten\u00ed s liniov\u00fdm \u0161k\u00e1lov\u00e1n\u00edm podle jader CPU.<\/p>\n<p>Nejd\u016fle\u017eit\u011bj\u0161\u00ed rozd\u00edly MDBX ve srovn\u00e1n\u00ed s LMDB:<\/p>\n<ul>\n<li class=\"l\"> V\u00fdrazn\u011b v\u00edce pozornosti je v\u011bnov\u00e1no kvalit\u011b k\u00f3du, testov\u00e1n\u00ed a automatick\u00e9mu ov\u011b\u0159ov\u00e1n\u00ed.\n<li class=\"l\"> Podstatn\u011b v\u00edce kontroly b\u011bhem pr\u00e1ce, po\u010d\u00ednaje kontrolou parametr\u016f, kon\u010de intern\u00edm auditem struktur datab\u00e1ze.\n<li class=\"l\"> Automatick\u00e1 kompakce a automatick\u00e9 \u0159\u00edzen\u00ed velikosti datab\u00e1ze.\n<li class=\"l\"> Jednotn\u00fd form\u00e1t datab\u00e1ze pro 32-bitov\u00e9 a 64-bitov\u00e9 verze.\n<li class=\"l\"> Odhad objemu v\u00fdb\u011br\u016f podle rozsah\u016f (estimation query range).\n<li class=\"l\"> Podpora kl\u00ed\u010d\u016f dvojn\u00e1sobn\u011b v\u011bt\u0161\u00edch a u\u017eivatelsky voliteln\u00e9 velikosti str\u00e1nky DB.\n<\/ul>\n<p>Uvoln\u011bn\u00fd kandid\u00e1t na vyd\u00e1n\u00ed libmdbx je v\u00fdsledkem rozhodnut\u00ed p\u0159ijat\u00e9ho v srpnu 2019 o rozd\u011blen\u00ed projekt\u016f MDBX a MithrilDB. Bylo rozhodnuto v libmdbx odstranit (racion\u00e1ln\u00ed) maximum technick\u00e9ho dluhu a stabilizovat knihovnu. V praxi bylo v t\u00e9to oblasti provedeno 2-3kr\u00e1t v\u00edce, ne\u017e se p\u016fvodn\u011b odhadovalo a pl\u00e1novalo:<\/p>\n<ul>\n<li class=\"l\"> Byla zavedena podpora pro macOS a platformy \u201edruh\u00e9ho sledu\u201c: FreeBSD, Solaris, DragonFly BSD, OpenBSD, NetBSD. Podpora AIX a HP-UX m\u016f\u017ee b\u00fdt p\u0159id\u00e1na podle pot\u0159eby.\n<li class=\"l\"> Byla provedena sanace k\u00f3du pomoc\u00ed Undefined Behavior Sanitizer a Address Sanitizer, odstran\u011bna v\u0161echna upozorn\u011bn\u00ed p\u0159i kompilaci s \u201e-Wpedantic\u201c, v\u0161echna upozorn\u011bn\u00ed Coverity Static Analyzer atd.\n<li class=\"l\"> Aktualizace <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/blob\/master\/mdbx.h\">popisu API<\/a><\/noindex>.\n<li class=\"l\"> Slou\u010den\u00ed (amalgame) zdrojov\u00e9ho k\u00f3du pro usnadn\u011bn\u00ed integrace.\n<li class=\"l\"> Podpora CMake.\n<li class=\"l\"> Podpora vno\u0159en\u00fdch transakc\u00ed.\n<li class=\"l\"> Pou\u017eit\u00ed bootid pro ur\u010den\u00ed skute\u010dnosti restartu OS (\u0161pinav\u00e9ho zastaven\u00ed DB).\n<li class=\"l\"> Celkov\u00fd po\u010det aktualizovan\u00fdch\/star\u00fdch str\u00e1nek a roz\u0161\u00ed\u0159en\u00e9 informace o transakc\u00edch.\n<li class=\"l\"> Mo\u017enost MDBX_ACCEDE pro p\u0159ipojen\u00ed k ji\u017e otev\u0159en\u00e9 datab\u00e1zi v kompatibiln\u00edm re\u017eimu.\n<li class=\"l\"> Pou\u017eit\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/www.gnu.org\/software\/libc\/manual\/html_node\/Open-File-Description-Locks.html\">OFD z\u00e1mky<\/a><\/noindex> v p\u0159\u00edpad\u011b jejich dostupnosti.\n<li class=\"l\"> Hork\u00e9 z\u00e1lohov\u00e1n\u00ed pomoc\u00ed pipe.\n<li class=\"l\"> Specializovan\u00fd optimalizovan\u00fd algoritmus vnit\u0159n\u00edho t\u0159\u00edd\u011bn\u00ed (a\u017e 2-3kr\u00e1t rychlej\u0161\u00ed ne\u017e \u201eqsort()\u201c a a\u017e o 30% rychlej\u0161\u00ed ne\u017e \u201estd::sort()\u201c).\n<li class=\"l\"> Zv\u00fd\u0161ena maxim\u00e1ln\u00ed d\u00e9lka kl\u00ed\u010de.\n<li class=\"l\"> Automatick\u00e9 \u0159\u00edzen\u00ed na\u010d\u00edt\u00e1n\u00ed (strategie ukl\u00e1d\u00e1n\u00ed do vyrovn\u00e1vac\u00ed pam\u011bti datab\u00e1zov\u00e9ho souboru v pam\u011bti).\n<li class=\"l\"> Agresivn\u011bj\u0161\u00ed a rychlej\u0161\u00ed automatick\u00e1 kompakce.\n<li class=\"l\"> Optim\u00e1ln\u011bj\u0161\u00ed strategie slou\u010den\u00ed str\u00e1nek B+ stromu.\n<li class=\"l\"> Kontrola nelok\u00e1ln\u00edch souborov\u00fdch syst\u00e9m\u016f (NFS, Samba atd.) pro prevenci po\u0161kozen\u00ed DB p\u0159i nespr\u00e1vn\u00e9m pou\u017eit\u00ed.\n<li class=\"l\"> Roz\u0161\u00ed\u0159en\u00e1 sada test\u016f.\n<\/ul>\n<p>V\u00fdvoj \u201edal\u0161\u00ed\u201c verze libmdbx bude pokra\u010dovat v r\u00e1mci samostatn\u00e9ho projektu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/MithrilDB\">MithrilDB<\/a><\/noindex>, zat\u00edmco sm\u011brem k v\u00fdvoji \u201esou\u010dasn\u00e9\u201c verze MDBX sm\u011b\u0159uje k zmrazen\u00ed sady funkc\u00ed a stabilizaci. Toto rozhodnut\u00ed bylo u\u010din\u011bno ze t\u0159\u00ed d\u016fvod\u016f:<\/p>\n<ul>\n<li class=\"l\"> \u00dapln\u00e1 nekompatibilita: pro realizaci v\u0161ech pl\u00e1novan\u00fdch funkc\u00ed v MithrilDB je vy\u017eadov\u00e1n jin\u00fd (nekompatibiln\u00ed) form\u00e1t datab\u00e1zov\u00fdch soubor\u016f a jin\u00e9 (nekompatibiln\u00ed) API.\n<li class=\"l\"> Nov\u00fd zdrojov\u00fd k\u00f3d: pro zdrojov\u00fd k\u00f3d MithrilDB je zaji\u0161t\u011bna licen\u010dn\u00ed nez\u00e1vislost na LMDB a samotn\u00fd projekt bude pl\u00e1nov\u00e1n k publikaci pod jinou licenc\u00ed (schv\u00e1lenou <noindex><a rel=\"nofollow\" href=\"https:\/\/opensource.org\/\">OSI<\/a><\/noindex> licenc\u00ed Apache 2.0, a ne <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openldap.org\/software\/release\/license.html\">OpenLDAP Public License<\/a><\/noindex>).\n<li class=\"l\"> Rozd\u011blen\u00ed umo\u017e\u0148uje p\u0159edej\u00edt potenci\u00e1ln\u00edmu zmaten\u00ed, p\u0159in\u00e9st v\u00edce ur\u010dit\u00e9ho a zajistit nez\u00e1vislost cesty rozvoje projekt\u016f.\n<\/ul>\n<p>MithrilDB, stejn\u011b jako MDBX, se tak\u00e9 zakl\u00e1d\u00e1 na <noindex><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+ stromu<\/a><\/noindex> a tak\u00e9 se bude vyzna\u010dovat extr\u00e9mn\u011b vysok\u00fdm v\u00fdkonem, p\u0159i\u010dem\u017e odstran\u00ed \u0159adu z\u00e1sadn\u00edch nedostatk\u016f MDBX a LMDB. Konkr\u00e9tn\u011b bude vy\u0159e\u0161en probl\u00e9m \u201edlouh\u00fdch \u010dten\u00ed\u201c, kter\u00fd se projevuje jako \u201ezv\u011bt\u0161ov\u00e1n\u00ed\u201c datab\u00e1ze v d\u016fsledku blokov\u00e1n\u00ed zpracov\u00e1n\u00ed odpadu dlouh\u00fdmi \u010dtec\u00edmi transakcemi. Mezi nov\u00e9 funkce MithrilDB pat\u0159\u00ed:<\/p>\n<ul>\n<li class=\"l\"> Podpora um\u00edst\u011bn\u00ed DB na r\u016fzn\u00fdch heterogenn\u00edch m\u00e9di\u00edch: HDD, SSD a nevolatiln\u00ed pam\u011bti.\n<li class=\"l\"> Optim\u00e1ln\u00ed strategie pro \u201ecenn\u00e1\u201c a \u201em\u00e9n\u011b cenn\u00e1\u201c, pro \u201ehotov\u00e1\u201c, \u201etepl\u00e1\u201c a \u201estuden\u00e1\u201c data.\n<li class=\"l\"> Pou\u017eit\u00ed Merkle trees pro kontrolu integrity datab\u00e1ze.\n<li class=\"l\"> Voliteln\u00fd v\u00fdkon WAL a v\u00fdrazn\u011b vy\u0161\u0161\u00ed v\u00fdkon v sc\u00e9n\u00e1\u0159\u00edch s intenzivn\u00edm z\u00e1pisem s garancemi integrity dat.\n<li class=\"l\"> L\u00edn\u00e9 dodate\u010dn\u00e9 ukl\u00e1d\u00e1n\u00ed dat na disc\u00edch.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52147\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0434\u043b\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0442\u043e\u0440\u043e\u0439 \u043a\u0430\u043d\u0434\u0438\u0434\u0430\u0442 \u0432 \u0440\u0435\u043b\u0438\u0437\u044b \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 libmdbx \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \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 (0.5) \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. \u041a\u043e\u0434 libmdbx \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 OpenLDAP Public License. \u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 MDBX \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f 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