{"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\/sv\/blog\/news\/proekt-dragonfly-razvivaet-bolee-bystruyu-zamenu-redis-i-memcached","title":{"rendered":"Projekt Dragonfly utvecklar en snabbare ers\u00e4ttning f\u00f6r Redis och Memcached","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Den f\u00f6rsta versionen av Dragonflys datacachningssystem i minnet \u00e4r tillg\u00e4nglig, vilket erbjuder st\u00f6d f\u00f6r protokollen Memcached och Redis, men som m\u00f6jligg\u00f6r f\u00f6rfr\u00e5gningar med betydligt h\u00f6gre prestanda och l\u00e4gre minnesf\u00f6rbrukning. Systemet manipulerar data i nyckel\/v\u00e4rde-format och kan till\u00e4mpas som en l\u00e4ttviktsl\u00f6sning f\u00f6r att f\u00f6rb\u00e4ttra prestanda p\u00e5 h\u00f6gt belastade webbplatser, som cacherar l\u00e5ngsamma f\u00f6rfr\u00e5gningar till databashanterare och mellanlagrar data i minnet. Dragonfly-koden \u00e4r skriven i C\/C++ och distribueras under BSL-licens (Business Source License). <\/p>\n

BSL-licensen f\u00f6reslogs av MySQL:s medgrundare som ett alternativ till Open Core-modellen. K\u00e4rnan i BSL \u00e4r att koden f\u00f6r den ut\u00f6kade funktionaliteten initially \u00e4r tillg\u00e4nglig f\u00f6r \u00e4ndringar, men under en viss period kan den anv\u00e4ndas kostnadsfritt endast under ytterligare villkor, vars kringg\u00e5ende kr\u00e4ver en kommersiell licens. Ytterligare licensvillkor f\u00f6r Dragonfly-projektet f\u00f6reskriver att koden ska \u00f6verg\u00e5 till Apache 2.0-licens f\u00f6rst den 1 juni 2027. Fram till dess till\u00e5ter licensen anv\u00e4ndning av koden endast f\u00f6r att s\u00e4kerst\u00e4lla drift av sina tj\u00e4nster och produkter, men f\u00f6rbjuder anv\u00e4ndning f\u00f6r att skapa betalda molntj\u00e4nster som fungerar som ett lager ovanp\u00e5 Dragonfly. <\/p>\n

Enligt utvecklarna och demonstrerade tester konkurrerar Dragonfly om titeln som det snabbaste minneslagringssystemet. J\u00e4mf\u00f6rt med Redis har Dragonfly under typiska belastningar uppn\u00e5tt en prestanda\u00f6kning med 25 g\u00e5nger och en minskning av minnesf\u00f6rbrukningen med tre g\u00e5nger. En server<\/a> Dragonfly kan hantera miljontals f\u00f6rfr\u00e5gningar per sekund, till exempel i en Amazon EC2 c6gn.16xlarge-milj\u00f6 n\u00e5ddes en prestanda p\u00e5 3,8 miljoner f\u00f6rfr\u00e5gningar per sekund.

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

I tester f\u00f6r lagring av 5 GB data kr\u00e4vde Dragonfly 30% mindre minne \u00e4n Redis. Under skapandet av snapshots med kommandot «bgsave» \u00f6kar minnesanv\u00e4ndningen, men vid toppar f\u00f6rblir den n\u00e4stan tre g\u00e5nger mindre \u00e4n i Redis, och sj\u00e4lva snapshot-inspelningsoperationen utf\u00f6rs betydligt snabbare (i testet spelades snapshotet i Dragonfly in p\u00e5 30 sekunder, medan Redis tog 42 sekunder).

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

H\u00f6g prestanda uppn\u00e5s genom en flerk\u00e4rnarkitektur utan resursdelning (shared-nothing), vilket inneb\u00e4r att varje tr\u00e5d kopplas till en separat, avskild behandlare med sin egen del av data, som arbetar utan mutexar och spin-l\u00e5s. F\u00f6r att s\u00e4kerst\u00e4lla atom\u00e4ritet vid arbete med flera nycklar anv\u00e4nds l\u00e4tta l\u00e5s VLL. F\u00f6r effektiv lagring av information i minnet till\u00e4mpas strukturen dashtable, som implementerar en variant av sektionerade hash-tabeller. <\/p>\n

Bland funktionerna som finns i den f\u00f6rsta versionen m\u00e4rks st\u00f6d f\u00f6r protokollet RESP2 och 130 Redis-kommandon, vilket ungef\u00e4r motsvarar funktionaliteten i Redis 2.8. Dessutom st\u00f6djer Dragonfly alla memcached-kommandon f\u00f6rutom CAS (check-and-set), erbjuder st\u00f6d f\u00f6r asynkrona operationer f\u00f6r att skapa snapshots, s\u00e4kerst\u00e4ller f\u00f6ruts\u00e4gbart minnesanv\u00e4ndning, tillhandah\u00e5ller en inbyggd tolk f\u00f6r Lua 5.4 och st\u00f6der komplexa datatyper s\u00e5som hash, m\u00e4ngder och listor (ZSET, HSET, LIST, SETS och STRING). <\/p>\n

En separat cache-l\u00e4gesfunktion \u00e4r tillg\u00e4nglig d\u00e4r gamla data automatiskt ers\u00e4tts med nya n\u00e4r det finns brist p\u00e5 ledigt minne. Det \u00e4r m\u00f6jligt att knyta en livsl\u00e4ngd till data, under vilken data anses aktuella. Lagringsstatus kan \u00e5terst\u00e4llas till disken i bakgrunden f\u00f6r senare \u00e5terst\u00e4llning efter omstart. F\u00f6r systemhantering tillhandah\u00e5lls en HTTP-konsol (kopplas till TCP-port 6379) och ett API f\u00f6r att leverera m\u00e4tv\u00e4rden, som \u00e4r kompatibelt med Prometheus. I kommande versioner planeras ytterligare st\u00f6d f\u00f6r Redis-kommandon och implementering av lagringsreplikering f\u00f6r att s\u00e4kerst\u00e4lla felresistens och lastbalansering.
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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