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w ϨεϙϯελΠϜϢʔβମݧʹେ͖ͳӨڹ w ͕ݮΔ w ίϯόʔδϣϯ͕૿͑Δ w ʮγΰτͰίίϩΦυϧͻͱΛ;͢ʯ͜ͱ ͕Ͱ͖Δ Why ͳͥ3FEJTʹֶ͍ͭͯͿͷ͔ ৽ଔݚमͰߦ͏*46$0/ͷັྗ /BP.JOBNJ https://speakerdeck.com/south37/xin-zu-yan-xiu-dexing-u-isucon-falsemei-li?slide=15
multiplexing layer supported by this system. * The following should be ordered by performances, descending. */ #ifdef HAVE_EVPORT #include "ae_evport.c" #else #ifdef HAVE_EPOLL #include "ae_epoll.c" #else #ifdef HAVE_KQUEUE #include "ae_kqueue.c" #else #include "ae_select.c" #endif #endif #endif ࡞ऀۘͷΠϕϯτϥΠϒϥϦ w FWQPSU4PMBSJTҎ߱ w FQPMM-JOVY w LRVFVF#4% w TFMFDUେମ͋Δ
the keys with an expire set. • allkeys-lru: Evict any key using approximated LRU. • volatile-lfu: Evict using approximated LFU among the keys with an expire set. • allkeys-lfu: Evict any key using approximated LFU. • volatile-random: Remove a random key among the ones with an expire set. • allkeys-random: Remove a random key, any key. • volatile-ttl: Remove the key with the nearest expire time (minor TTL) • noeviction: Don't evict anything, just return an error on write operations. Eviction Policy ϝϞϦ͔ΒᷓΕͦ͏ͳ࣌ͷڍಈΛઃఆͰ͖Δ
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ҎԼͷ߹ɺϝϞϦޮͷΑ ͍z[JQMJTUzͰΤϯίʔσΟϯά w ͦ͏Ͱͳ͍߹lEJDUz IBTIUBCMF w ϝϞϦͱ$16ͷτϨʔυΦϑ Hash // t_hash.c /* Check the length of a number of objects to see if we need to convert a * ziplist to a real hash. Note that we only check string encoded objects * as their string length can be queried in constant time. */ void hashTypeTryConversion(robj *o, robj **argv, int start, int end) { int i; if (o->encoding != OBJ_ENCODING_ZIPLIST) return; for (i = start; i <= end; i++) { if (sdsEncodedObject(argv[i]) && sdslen(argv[i]->ptr) > server.hash_max_ziplist_value) { hashTypeConvert(o, OBJ_ENCODING_HT); break; } } }
encoded dually linked list that is designed * to be very memory efficient. It stores both strings and integer values, * where integers are encoded as actual integers instead of a series of * characters. It allows push and pop operations on either side of the list * in O(1) time. However, because every operation requires a reallocation of * the memory used by the ziplist, the actual complexity is related to the * amount of memory used by the ziplist.
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߹ɻ Set // t_set.c /* Add the specified value into a set. * * If the value was already member of the set, nothing is done and 0 is * returned, otherwise the new element is added and 1 is returned. */ int setTypeAdd(robj *subject, sds value) { long long llval; if (subject->encoding == OBJ_ENCODING_HT) { dict *ht = subject->ptr; dictEntry *de = dictAddRaw(ht,value,NULL); if (de) { dictSetKey(ht,de,sdsdup(value)); dictSetVal(ht,de,NULL); return 1; } } else if (subject->encoding == OBJ_ENCODING_INTSET) { if (isSdsRepresentableAsLongLong(value,&llval) == C_OK) { uint8_t success = 0; subject->ptr = intsetAdd(subject->ptr,llval,&success); if (success) { /* Convert to regular set when the intset contains * too many entries. */ if (intsetLen(subject->ptr) > server.set_max_intset_entries) setTypeConvert(subject,OBJ_ENCODING_HT); return 1; } } else { /* Failed to get integer from object, convert to regular set. */ setTypeConvert(subject,OBJ_ENCODING_HT); /* The set *was* an intset and this value is not integer * encodable, so dictAdd should always work. */ serverAssert(dictAdd(subject->ptr,sdsdup(value),NULL) == DICT_OK); return 1; } } else { serverPanic("Unknown set encoding"); } return 0; }
kind of objects like Strings and Hashes can be * internally represented in multiple ways. The 'encoding' field of the object * is set to one of this fields for this object. */ #define OBJ_ENCODING_RAW 0 /* Raw representation */ #define OBJ_ENCODING_INT 1 /* Encoded as integer */ #define OBJ_ENCODING_HT 2 /* Encoded as hash table */ #define OBJ_ENCODING_ZIPMAP 3 /* Encoded as zipmap */ #define OBJ_ENCODING_LINKEDLIST 4 /* No longer used: old list encoding. */ #define OBJ_ENCODING_ZIPLIST 5 /* Encoded as ziplist */ #define OBJ_ENCODING_INTSET 6 /* Encoded as intset */ #define OBJ_ENCODING_SKIPLIST 7 /* Encoded as skiplist */ #define OBJ_ENCODING_EMBSTR 8 /* Embedded sds string encoding */ #define OBJ_ENCODING_QUICKLIST 9 /* Encoded as linked list of ziplists */ #define OBJ_ENCODING_STREAM 10 /* Encoded as a radix tree of listpacks */ typedef struct redisObject { unsigned type:4; unsigned encoding:4; unsigned lru:LRU_BITS; /* LRU time (relative to global lru_clock) or * LFU data (least significant 8 bits frequency * and most significant 16 bits access time). */ int refcount; void *ptr; } robj;
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class VisitorCounter def initialize(app) @app = app end def call(env) $redis.pfadd 'visitors', Rack::Request.new(env).ip @app.call(env) end end use VisitorCounter get '/' do visitors = $redis.pfcount 'visitors' "This website has been visited by #{visitors} unique visitors." end HyperLogLog ग़య: https://thoughtbot.com/blog/hyperloglogs-in-redis
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{ compress: true, expires_in: 90.minutes } w .BSTIBMEVNQ .BSTIBMMPBE Ͱ EF TFSJBMJ[F w 1SJNJUJWFͬΆ͘ͳ͍σʔλܕΛ͍Εͳ͍ w ൵͍͠ࣄނͷྫXBOUFEMZQPTUNPSUFNT wantedly/post-mortems#40
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![©2019 Wantedly, Inc. 3BJMTDBDIFͷόοΫΤϯυͱͯ͠ # config/environments/production.rb config.cache_store = :redis_store, ENV["REDIS_RAILS_CACHE_URL"],](https://files.speakerdeck.com/presentations/96002f59f1e74d52b016775de06621f3/slide_53.jpg){kind=link}
![©2019 Wantedly, Inc. ίϚϯυςʔϒϧ struct redisCommand redisCommandTable[] = { {"module",moduleCommand,-2,"as",0,NULL,0,0,0,0,0},](https://files.speakerdeck.com/presentations/96002f59f1e74d52b016775de06621f3/slide_60.jpg){kind=link}
