{"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\/sk\/blog\/news\/proekt-dragonfly-razvivaet-bolee-bystruyu-zamenu-redis-i-memcached","title":{"rendered":"Projekt Dragonfly rozv\u00edja r\u00fdchlej\u0161iu n\u00e1hradu za Redis a Memcached.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Prv\u00fd vydanie syst\u00e9mu vyrovn\u00e1vacej pam\u00e4te Dragonfly je teraz dostupn\u00e9, pon\u00fakaj\u00face podporu pre protokoly Memcached a Redis a umo\u017e\u0148uj\u00face vykon\u00e1va\u0165 po\u017eiadavky s v\u00fdrazne vy\u0161\u0161ou v\u00fdkonnos\u0165ou a ni\u017e\u0161ou spotrebou pam\u00e4te. Syst\u00e9m manipuluje s d\u00e1tami vo form\u00e1te k\u013e\u00fa\u010d\/hodnota a m\u00f4\u017ee by\u0165 pou\u017eit\u00fd ako \u013eahk\u00e9 rie\u0161enie na zr\u00fdchlenie pr\u00e1ce vysoce za\u0165a\u017een\u00fdch webov\u00fdch str\u00e1nok, vyrovn\u00e1vaj\u00faci pomal\u00e9 po\u017eiadavky na datab\u00e1zov\u00fd syst\u00e9m (DBMS) a medzi\u010dasov\u00e9 d\u00e1ta v pam\u00e4ti. K\u00f3d Dragonfly je nap\u00edsan\u00fd v jazykoch C\/C++ a je \u0161\u00edren\u00fd pod licenciou BSL (Business Source License). <\/p>\n

Licencia BSL bola navrhnut\u00e1 spoluzakladate\u013emi MySQL ako alternat\u00edva k modelu Open Core. Podstatou BSL je, \u017ee k\u00f3d roz\u0161\u00edrenej funk\u010dnosti je p\u00f4vodne dostupn\u00fd na \u00fapravy, ale po\u010das ur\u010dit\u00e9ho \u010dasov\u00e9ho obdobia m\u00f4\u017ee by\u0165 bezplatne pou\u017e\u00edvan\u00fd iba za predpokladu dodato\u010dn\u00fdch podmienok, na ob\u00eddenie ktor\u00fdch je potrebn\u00e9 zak\u00fapenie komer\u010dnej licencie. Dodato\u010dn\u00e9 licen\u010dn\u00e9 podmienky projektu Dragonfly predpisuj\u00fa prechod k licencii Apache 2.0 a\u017e 1. j\u00fana 2027. Do tohto \u010dasu licencia povo\u013euje pou\u017e\u00edvanie k\u00f3du iba na zabezpe\u010denie prev\u00e1dzky vlastn\u00fdch slu\u017eieb a produktov, ale zakazuje jeho aplik\u00e1ciu na vytv\u00e1ranie platen\u00fdch cloudov\u00fdch slu\u017eieb, ktor\u00e9 s\u00fa nadstavbami nad Dragonfly. <\/p>\n

Pod\u013ea vyhl\u00e1sen\u00ed v\u00fdvoj\u00e1rov a demon\u0161trovan\u00fdch testov Dragonfly m\u00e1 amb\u00edcie sta\u0165 sa najr\u00fdchlej\u0161\u00edm syst\u00e9mom ukladania v pam\u00e4ti. V porovnan\u00ed s Redis dosiahlo Dragonfly pri typick\u00fdch n\u00e1rokoch 25-n\u00e1sobn\u00e9 zv\u00fd\u0161enie v\u00fdkonu a trojn\u00e1sobn\u00e9 zn\u00ed\u017eenie spotreby pam\u00e4te. server<\/a> Dragonfly dok\u00e1\u017ee spracova\u0165 mili\u00f3ny po\u017eiadaviek za sekundu, napr\u00edklad vo prostred\u00ed Amazon EC2 c6gn.16xlarge sa podarilo dosiahnu\u0165 v\u00fdkon 3,8 mili\u00f3na po\u017eiadaviek za sekundu.

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

V testoch na ukladanie 5 GB d\u00e1t si Dragonfly vy\u017eiadal o 30 % menej pam\u00e4te ako Redis. Po\u010das vytv\u00e1rania sn\u00edmok pr\u00edkazom «bgsave» sa spotreba pam\u00e4te zvy\u0161uje, av\u0161ak v najvy\u0161\u0161\u00edch momentoch zost\u00e1va takmer trikr\u00e1t ni\u017e\u0161ia ako v Redis, pri\u010dom samotn\u00e1 oper\u00e1cia z\u00e1pisu sn\u00edmky sa vykon\u00e1va ove\u013ea r\u00fdchlej\u0161ie (v teste bola sn\u00edmka v Dragonfly zap\u00edsan\u00e1 za 30 sek\u00fand, zatia\u013e \u010do Redis — za 42 sek\u00fand).

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

Vysok\u00fd v\u00fdkon je dosahovan\u00fd v\u010faka viacvl\u00e1knovej architekt\u00fare bez zdie\u013eania zdrojov (shared-nothing), \u010do znamen\u00e1, \u017ee k ka\u017ed\u00e9mu vl\u00e1knu je priraden\u00fd samostatn\u00fd izolovan\u00fd spracovate\u013e so svojou vlastnou sadou d\u00e1t, pracuj\u00faci bez mutexov a spin-z\u00e1mkov. Na zabezpe\u010denie atomicity pri pr\u00e1ci s viacer\u00fdmi k\u013e\u00fa\u010dmi s\u00fa pou\u017e\u00edvan\u00e9 \u013eahk\u00e9 z\u00e1mky VLL. Na efekt\u00edvne uchov\u00e1vanie inform\u00e1ci\u00ed v pam\u00e4ti sa pou\u017e\u00edva \u0161trukt\u00fara dashtable, ktor\u00e1 implementuje vari\u00e1ciu segmentovan\u00fdch hash-tabl\u00edc. <\/p>\n

Z mo\u017enost\u00ed dostupn\u00fdch v prvom vydan\u00ed m\u00f4\u017eeme vyzdvihn\u00fa\u0165 podporu protokolu RESP2 a 130 pr\u00edkazov Redis, \u010do pribli\u017ene zodpoved\u00e1 funk\u010dnosti vydania Redis 2.8. Okrem toho Dragonfly podporuje v\u0161etky pr\u00edkazy memcached s v\u00fdnimkou CAS (check-and-set), poskytuje podporu asynchr\u00f3nnych oper\u00e1ci\u00ed na vytv\u00e1ranie snapshotov, zabezpe\u010duje predv\u00eddate\u013en\u00fa spotrebu pam\u00e4te, poskytuje vstavan\u00fd interpret Lua 5.4 a podporuje zlo\u017eit\u00e9 typy d\u00e1t ako hash, mno\u017einy a zoznamy (ZSET, HSET, LIST, SETS a STRING). <\/p>\n

Samostatne je dostupn\u00fd re\u017eim vyrovn\u00e1vacej pam\u00e4te, pri ktorom je automaticky zabezpe\u010den\u00e9 nahradenie star\u00fdch \u00fadajov nov\u00fdmi po vy\u010derpan\u00ed vo\u013enej pam\u00e4te. Je mo\u017en\u00e9 priradi\u0165 d\u00e1tam \u010dasov\u00fd limit, po\u010das ktor\u00e9ho s\u00fa pova\u017eovan\u00e9 za aktu\u00e1lne. Stav \u00falo\u017eiska m\u00f4\u017ee by\u0165 na pozad\u00ed vymazan\u00fd na disk pre n\u00e1sledn\u00e9 obnovenie po re\u0161tartovan\u00ed. Na riadenie syst\u00e9mu je k dispoz\u00edcii HTTP konzola (priraden\u00e1 k TCP portu 6379) a API pre poskytovanie metrik, kompatibiln\u00e9 s Prometheus. V nasleduj\u00facich verzi\u00e1ch sa pl\u00e1nuje roz\u0161\u00edri\u0165 podporu pr\u00edkazov Redis a implementova\u0165 mo\u017enos\u0165 replik\u00e1cie \u00falo\u017eiska na zabezpe\u010denie odolnosti vo\u010di chyb\u00e1m a vyv\u00e1\u017eenia za\u0165a\u017eenia.
\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\u00edja r\u00fdchlej\u0161iu alternat\u00edvu k Redis a Memcached | ProHoster","description":"Dostupn\u00e9 je prv\u00e9 vydanie syst\u00e9mu vyrovn\u00e1vacej pam\u00e4te \u00fadajov v opera\u010dnej pam\u00e4ti Dragonfly, ktor\u00e9 poskytuje podporu protokolov Memcached a Redis, ale umo\u017e\u0148uje vykon\u00e1va\u0165 po\u017eiadavky s ove\u013ea vy\u0161\u0161\u00edm 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