{"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\/hu\/blog\/news\/proekt-dragonfly-razvivaet-bolee-bystruyu-zamenu-redis-i-memcached","title":{"rendered":"A Dragonfly projekt gyorsabb megold\u00e1st fejleszt a Redis \u00e9s a Memcached helyett","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

El\u00e9rhet\u0151 az els\u0151 kiad\u00e1s a Dragonfly mem\u00f3riaalap\u00fa adatcache rendszerb\u0151l, amely t\u00e1mogatja a Memcached \u00e9s Redis protokollokat, de lehet\u0151v\u00e9 teszi a lek\u00e9rdez\u00e9sek v\u00e9grehajt\u00e1s\u00e1t sokkal magasabb teljes\u00edtm\u00e9nnyel \u00e9s alacsonyabb mem\u00f3riafogyaszt\u00e1ssal. A rendszer kulcs\/\u00e9rt\u00e9k form\u00e1tum\u00fa adatokat kezel, \u00e9s alkalmazhat\u00f3 k\u00f6nny\u0171 megold\u00e1sk\u00e9nt a nagy terhel\u00e9s\u0171 webhelyek teljes\u00edtm\u00e9ny\u00e9nek jav\u00edt\u00e1s\u00e1ra, a lass\u00fa adatb\u00e1zis-lek\u00e9rdez\u00e9sek \u00e9s a k\u00f6ztes adatok cache-el\u00e9s\u00e9re a mem\u00f3ri\u00e1ban. A Dragonfly k\u00f3dj\u00e1t C\/C++ nyelveken \u00edrt\u00e1k, \u00e9s BSL (Business Source License) licenc alatt terjesztik. <\/p>\n

A BSL licencet a MySQL t\u00e1rsalap\u00edt\u00f3i javasolt\u00e1k az Open Core modell alternat\u00edv\u00e1jak\u00e9nt. A BSL l\u00e9nyege, hogy a b\u0151v\u00edtett funkcionalit\u00e1s k\u00f3dja kezdetben el\u00e9rhet\u0151 a m\u00f3dos\u00edt\u00e1sokra, de egy ideig kiz\u00e1r\u00f3lag tov\u00e1bbi felt\u00e9telek betart\u00e1s\u00e1val haszn\u00e1lhat\u00f3 ingyenesen, amelyek megker\u00fcl\u00e9s\u00e9hez kereskedelmi licencek megv\u00e1s\u00e1rl\u00e1s\u00e1ra van sz\u00fcks\u00e9g. A Dragonfly projekt tov\u00e1bbi licencfelt\u00e9telei el\u0151\u00edrj\u00e1k, hogy a k\u00f3d az Apache 2.0 licencre 2027. j\u00fanius 1-j\u00e9n kell \u00e1tford\u00edtani. Eddig a licenc csak a saj\u00e1t szolg\u00e1ltat\u00e1sok \u00e9s term\u00e9kek m\u0171k\u00f6dtet\u00e9s\u00e9re enged\u00e9lyezi a k\u00f3d haszn\u00e1lat\u00e1t, de tiltan\u00e1 a fizet\u0151s felh\u0151szolg\u00e1ltat\u00e1sok l\u00e9trehoz\u00e1s\u00e1t, amelyek a Dragonfly-ra \u00e9p\u00fclnek. <\/p>\n

A fejleszt\u0151k \u00e1ll\u00edt\u00e1sa \u00e9s a bemutatott tesztek szerint a Dragonfly a leggyorsabb mem\u00f3ria t\u00e1rol\u00f3rendszer c\u00edm\u00e9re p\u00e1ly\u00e1zik. A Redis-hez k\u00e9pest a Dragonfly eset\u00e9ben szok\u00e1sos terhel\u00e9si mint\u00e1k mellett 25-sz\u00f6r\u00f6s teljes\u00edtm\u00e9nyn\u00f6veked\u00e9st \u00e9s h\u00e1romszoros mem\u00f3riafogyaszt\u00e1s-cs\u00f6kken\u00e9st siker\u00fclt el\u00e9rni. Egy szerver<\/a> A Dragonfly m\u00e1sodpercenk\u00e9nt milli\u00f3 lek\u00e9rdez\u00e9st k\u00e9pes feldolgozni, p\u00e9ld\u00e1ul az Amazon EC2 c6gn.16xlarge k\u00f6rnyezet\u00e9ben 3,8 milli\u00f3 lek\u00e9rdez\u00e9s\/m\u00e1sodperces teljes\u00edtm\u00e9nyt siker\u00fclt el\u00e9rni.

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

Az 5 GB adat t\u00e1rol\u00e1s\u00e1ra vonatkoz\u00f3 tesztekben a Dragonfly 30%-kal kevesebb mem\u00f3ri\u00e1t ig\u00e9nyelt, mint a Redis. A «bgsave» paranccsal t\u00f6rt\u00e9n\u0151 pillanatfelv\u00e9telek k\u00e9sz\u00edt\u00e9se sor\u00e1n a mem\u00f3riafogyaszt\u00e1s megn\u00f6vekszik, de a cs\u00facsid\u0151szakokban k\u00f6zel h\u00e1romszor kevesebb, mint a Redisn\u00e9l, \u00e9s a pillanatfelv\u00e9tel \u00edr\u00e1sa is jelent\u0151sen gyorsabban zajlik (a Dragonfly eset\u00e9ben a pillanatfelv\u00e9telt 30 m\u00e1sodperc alatt \u00edrt\u00e1k, m\u00edg a Redisn\u00e9l 42 m\u00e1sodpercet vett ig\u00e9nybe).

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

A magas teljes\u00edtm\u00e9ny a megosztott er\u0151forr\u00e1sok n\u00e9lk\u00fcli, t\u00f6bb sz\u00e1las architekt\u00far\u00e1nak k\u00f6sz\u00f6nhet\u0151, amelynek l\u00e9nyege, hogy minden sz\u00e1lhoz k\u00fcl\u00f6n, elszigetelt kezel\u0151 tartozik a saj\u00e1t adathalmoz\u00f3j\u00e1val, mutexek \u00e9s spin-lockok n\u00e9lk\u00fcl m\u0171k\u00f6dve. Az atomar\u00edt\u00e1s \u00e9rdek\u00e9ben t\u00f6bb kulccsal val\u00f3 munkav\u00e9gz\u00e9sn\u00e9l k\u00f6nny\u0171 VLL z\u00e1rol\u00e1sokat alkalmazunk. Az inform\u00e1ci\u00f3 hat\u00e9kony t\u00e1rol\u00e1s\u00e1ra a mem\u00f3ri\u00e1ban a dashtable strukt\u00far\u00e1t haszn\u00e1lj\u00e1k, amely a szekcion\u00e1lt hash-t\u00e1bl\u00e1k v\u00e1ltozat\u00e1t val\u00f3s\u00edtja meg. <\/p>\n

Az els\u0151 kiad\u00e1sban el\u00e9rhet\u0151 lehet\u0151s\u00e9gek k\u00f6z\u00f6tt szerepel a RESP2 protokoll t\u00e1mogat\u00e1sa \u00e9s 130 Redis parancs, ami k\u00f6r\u00fclbel\u00fcl megfelel a Redis 2.8 kiad\u00e1s\u00e1nak funkci\u00f3inak. Ezenk\u00edv\u00fcl a Dragonfly t\u00e1mogatja az \u00f6sszes memcached parancsot, kiv\u00e9ve a CAS (check-and-set) parancsot, t\u00e1mogatja az aszinkron m\u0171veleteket a pillanatfelv\u00e9telek l\u00e9trehoz\u00e1s\u00e1hoz, biztos\u00edtja a kisz\u00e1m\u00edthat\u00f3 mem\u00f3riahaszn\u00e1latot, be\u00e9p\u00edtett Lua 5.4 \u00e9rtelmez\u0151t k\u00edn\u00e1l, \u00e9s t\u00e1mogatja az \u00f6sszetett adatt\u00edpusokat, mint p\u00e9ld\u00e1ul a hasheket, halmazokat \u00e9s list\u00e1kat (ZSET, HSET, LIST, SETS \u00e9s STRING). <\/p>\n

K\u00fcl\u00f6n rendelkez\u00e9sre \u00e1ll egy gyors\u00edt\u00f3t\u00e1raz\u00e1si m\u00f3d, amely automatikusan biztos\u00edtja a r\u00e9gi adatok \u00fajakkal val\u00f3 felv\u00e1lt\u00e1s\u00e1t, miut\u00e1n a szabad mem\u00f3ria kimer\u00fclt. Lehets\u00e9ges az adatokhoz \u00e9letciklus-kapcsol\u00e1s, amely alatt az adatok \u00e9rv\u00e9nyesnek tekinthet\u0151k. A t\u00e1rol\u00f3 \u00e1llapota a h\u00e1tt\u00e9rben lementhet\u0151 a lemezre a k\u00e9s\u0151bbi \u00fajraind\u00edt\u00e1shoz. A rendszer kezel\u00e9s\u00e9re HTTP konzol \u00e1ll rendelkez\u00e9sre (a 6379 TCP portra csatlakozik) \u00e9s egy Prometheus-kompatibilis metrikakibocs\u00e1t\u00f3 API. A k\u00f6vetkez\u0151 verzi\u00f3kban a Redis parancsok t\u00e1mogat\u00e1s\u00e1nak kiterjeszt\u00e9se \u00e9s a t\u00e1rol\u00f3 replik\u00e1ci\u00f3s lehet\u0151s\u00e9g\u00e9nek bevezet\u00e9se is tervben van a megb\u00edzhat\u00f3s\u00e1g \u00e9s a terhel\u00e9seloszt\u00e1s biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben.
\n
Forr\u00e1s: 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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