{"id":104195,"date":"2022-05-31T15:36:40","date_gmt":"2022-05-31T13:36:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/proekt-dragonfly-razvivaet-bolee-bystruyu-zamenu-redis-i-memcached"},"modified":"2022-05-31T15:36:40","modified_gmt":"2022-05-31T13:36:41","slug":"proekt-dragonfly-razvivaet-bolee-bystruyu-zamenu-redis-i-memcached","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/proekt-dragonfly-razvivaet-bolee-bystruyu-zamenu-redis-i-memcached","title":{"rendered":"Projekt Dragonfly vyv\u00edj\u00ed rychlej\u0161\u00ed alternativu pro Redis a Memcached","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

K dispozici je prvn\u00ed vyd\u00e1n\u00ed syst\u00e9mu ke\u0161ov\u00e1n\u00ed dat v pam\u011bti Dragonfly, kter\u00fd podporuje protokoly Memcached a Redis, ale umo\u017e\u0148uje prov\u00e1d\u011bt dotazy s mnohem vy\u0161\u0161\u00edmi v\u00fdkonov\u00fdmi parametry a men\u0161\u00ed spot\u0159ebou pam\u011bti. Syst\u00e9m manipuluje s daty ve form\u00e1tu kl\u00ed\u010d\/hodnota a m\u016f\u017ee b\u00fdt pou\u017eit jako lehk\u00e9 \u0159e\u0161en\u00ed pro zrychlen\u00ed v\u00fdkonu vysoce zat\u00ed\u017een\u00fdch web\u016f, kter\u00e9 ke\u0161uj\u00ed pomal\u00e9 dotazy k datab\u00e1zov\u00fdm syst\u00e9m\u016fm a mezipam\u011b\u0165 v opera\u010dn\u00ed pam\u011bti. K\u00f3d Dragonfly je naps\u00e1n v jazyc\u00edch C\/C++ a je distribuov\u00e1n pod licenc\u00ed BSL (Business Source License). <\/p>\n

Licence BSL byla navr\u017eena spoluzakladateli MySQL jako alternativn\u00ed model k Open Core. Podstatou BSL je, \u017ee k\u00f3d roz\u0161\u00ed\u0159en\u00e9 funk\u010dnosti je v po\u010d\u00e1te\u010dn\u00ed f\u00e1zi dostupn\u00fd k \u00faprav\u00e1m, ale po ur\u010ditou dobu m\u016f\u017ee b\u00fdt zdarma pou\u017e\u00edv\u00e1n pouze za dodr\u017een\u00ed dal\u0161\u00edch podm\u00ednek, pro jejich\u017e obejit\u00ed je nutn\u00e9 zakoupit komer\u010dn\u00ed licenci. Dal\u0161\u00ed licen\u010dn\u00ed podm\u00ednky projektu Dragonfly stanovuj\u00ed p\u0159evod k\u00f3du na licenci Apache 2.0 a\u017e k 1. \u010dervnu 2027. Do t\u00e9 doby licence povoluje pou\u017eit\u00ed k\u00f3du pouze k zaji\u0161t\u011bn\u00ed funkcionality vlastn\u00edch slu\u017eeb a produkt\u016f, ale zakazuje pou\u017eit\u00ed pro vytv\u00e1\u0159en\u00ed placen\u00fdch cloudov\u00fdch slu\u017eeb, kter\u00e9 by byly nadstavbou nad Dragonfly. <\/p>\n

Podle tvrzen\u00ed v\u00fdvoj\u00e1\u0159\u016f a p\u0159edveden\u00fdch test\u016f si Dragonfly n\u00e1rokuje titul nejrychlej\u0161\u00edho syst\u00e9mu pro ukl\u00e1d\u00e1n\u00ed v pam\u011bti. V porovn\u00e1n\u00ed s Redis dok\u00e1zal Dragonfly p\u0159i typick\u00fdch typech z\u00e1t\u011b\u017ee dos\u00e1hnout 25n\u00e1sobn\u00e9ho zv\u00fd\u0161en\u00ed v\u00fdkonu a trojn\u00e1sobn\u00e9ho sn\u00ed\u017een\u00ed spot\u0159eby pam\u011bti. server<\/a> Dragonfly dok\u00e1\u017ee zpracov\u00e1vat miliony dotaz\u016f za sekundu, nap\u0159\u00edklad v prost\u0159ed\u00ed Amazon EC2 c6gn.16xlarge se poda\u0159ilo dos\u00e1hnout v\u00fdkonu 3,8 milionu dotaz\u016f za sekundu.

\"Projekt<\/center> <\/p>\n

V testech na ukl\u00e1d\u00e1n\u00ed 5 GB dat si Dragonfly vy\u017e\u00e1dal o 30 % m\u00e9n\u011b pam\u011bti ne\u017e Redis. B\u011bhem vytv\u00e1\u0159en\u00ed sn\u00edmk\u016f pomoc\u00ed p\u0159\u00edkazu «bgsave» se spot\u0159eba pam\u011bti zvy\u0161uje, ale v dob\u011b \u0161pi\u010dky z\u016fst\u00e1v\u00e1 t\u00e9m\u011b\u0159 t\u0159ikr\u00e1t ni\u017e\u0161\u00ed ne\u017e u Redis, a samotn\u00e1 operace z\u00e1pisu sn\u00edmku se prov\u00e1d\u00ed v\u00fdrazn\u011b rychleji (ve testu byl sn\u00edmek v Dragonfly zaps\u00e1n za 30 sekund, zat\u00edmco Redis - za 42 sekund).

\"Projekt<\/center> <\/p>\n

Vysok\u00fd v\u00fdkon je dosa\u017een d\u00edky v\u00edcestup\u0148ov\u00e9 architektu\u0159e bez sd\u00edlen\u00ed zdroj\u016f (shared-nothing), co\u017e znamen\u00e1, \u017ee ka\u017ed\u00e9mu vl\u00e1knu je p\u0159i\u0159azen samostatn\u00fd nez\u00e1visl\u00fd zpracovatel se svou porc\u00ed dat, kter\u00fd pracuje bez mutex\u016f a spin-z\u00e1mk\u016f. Pro zaji\u0161t\u011bn\u00ed atom\u00e1rnosti p\u0159i pr\u00e1ci s n\u011bkolika kl\u00ed\u010di se pou\u017e\u00edvaj\u00ed lehk\u00e9 z\u00e1mky VLL. Pro efektivn\u00ed ukl\u00e1d\u00e1n\u00ed informac\u00ed v pam\u011bti se pou\u017e\u00edv\u00e1 struktura dashtable, kter\u00e1 implementuje variantu segmentovan\u00fdch hash tabulek. <\/p>\n

Mezi funkcemi dostupn\u00fdmi v prvn\u00edm vyd\u00e1n\u00ed je podpora protokolu RESP2 a 130 p\u0159\u00edkaz\u016f Redis, co\u017e p\u0159ibli\u017en\u011b odpov\u00edd\u00e1 funk\u010dnosti verze Redis 2.8. Krom\u011b toho Dragonfly podporuje v\u0161echny p\u0159\u00edkazy memcached, krom\u011b CAS (check-and-set), poskytuje podporu pro asynchronn\u00ed operace pro vytv\u00e1\u0159en\u00ed snapshot\u016f, zaji\u0161\u0165uje p\u0159edv\u00eddatelnou spot\u0159ebu pam\u011bti, obsahuje vestav\u011bn\u00fd interpreter Lua 5.4 a podporuje slo\u017eit\u00e9 datov\u00e9 typy, jako jsou hash, mno\u017einy a seznamy (ZSET, HSET, LIST, SETS a STRING). <\/p>\n

Samostatn\u011b je k dispozici re\u017eim cache, kter\u00fd automaticky zaji\u0161\u0165uje vy\u0159azen\u00ed star\u00fdch dat nov\u00fdmi po vy\u010derp\u00e1n\u00ed voln\u00e9 pam\u011bti. Je mo\u017en\u00e1 vazba na data doby \u017eivotnosti, b\u011bhem kter\u00e9 se data pova\u017euj\u00ed za aktu\u00e1ln\u00ed. Stav \u00falo\u017ei\u0161t\u011b m\u016f\u017ee b\u00fdt na pozad\u00ed ulo\u017een na disk pro n\u00e1sledn\u00e9 obnoven\u00ed po restartov\u00e1n\u00ed. Pro \u0159\u00edzen\u00ed syst\u00e9mu je k dispozici HTTP konzole (p\u0159ipojuje se k TCP portu 6379) a API pro poskytov\u00e1n\u00ed metrik, kompatibiln\u00ed s Prometheus. V n\u00e1sleduj\u00edc\u00edch verz\u00edch se pl\u00e1nuje roz\u0161\u00ed\u0159en\u00ed podpory p\u0159\u00edkaz\u016f Redis a implementace replikace \u00falo\u017ei\u0161t\u011b pro zaji\u0161t\u011bn\u00ed odolnosti proti chyb\u00e1m a vyva\u017eov\u00e1n\u00ed zat\u00ed\u017een\u00ed.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 Dragonfly, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 Memcached \u0438 Redis, \u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u0437\u0430\u043f\u0440\u043e\u0441\u044b \u0441 \u0433\u043e\u0440\u0430\u0437\u0434\u043e \u0431\u043e\u043b\u0435\u0435 \u0432\u044b\u0441\u043e\u043a\u043e\u0439 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":104196,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104195","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Projekt Dragonfly vyv\u00edj\u00ed rychlej\u0161\u00ed alternativu k Redis a Memcached | ProHoster","description":"Je k dispozici prvn\u00ed vyd\u00e1n\u00ed syst\u00e9mu cache dat v pam\u011bti Dragonfly, kter\u00fd zaji\u0161\u0165uje podporu protokol\u016f Memcached a Redis, ale umo\u017e\u0148uje prov\u00e1d\u011bt dotazy s mnohem vy\u0161\u0161\u00edm 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