{"id":1122,"date":"2020-10-14T23:54:55","date_gmt":"2020-10-14T15:54:55","guid":{"rendered":"https:\/\/www.changxuan.top\/?p=1122"},"modified":"2020-12-19T15:39:13","modified_gmt":"2020-12-19T07:39:13","slug":"redis%e4%b8%ad%e7%9a%84%e5%ad%97%e5%85%b8","status":"publish","type":"post","link":"https:\/\/www.changxuan.top\/?p=1122","title":{"rendered":"Redis\u4e2d\u7684\u5b57\u5178"},"content":{"rendered":"
\n

<\/span>\u7b80\u4ecb<\/span><\/span><\/h2>\n

\u5b57\u5178\u662f\u4e00\u79cd\u5728 Redis \u4e2d\u9ad8\u9891\u4f7f\u7528\u7684\u7528\u4e8e\u4fdd\u5b58\u952e\u503c\u5bf9\u7684\u62bd\u8c61\u6570\u636e\u7ed3\u6784\uff0c\u5728 Java \u4e2d\u5e38\u7528\u7684\u6709 HasmMap<\/code> \u7b49\u3002<\/p>\n

\u7531\u4e8e\u5b57\u5178\u4e2d\u952e\u7684\u552f\u4e00\u6027\uff0c\u6240\u4ee5\u5728 Redis \u4e2d\u5f97\u5230\u4e86\u5e7f\u6cdb\u7684\u5e94\u7528\u3002<\/p>\n

<\/span>\u5b9e\u73b0<\/span><\/span><\/h2>\n

Redis \u4e2d\u7684\u5b57\u5178\u662f\u57fa\u4e8e\u54c8\u5e0c\u8868<\/code> (dictht, dict hash table)\u5b9e\u73b0\u7684\uff0c\u54c8\u5e0c\u8868\u4e2d\u7684\u6bcf\u4e2a\u8282\u70b9\u4fdd\u5b58\u4e00\u4e2a\u952e\u503c\u5bf9\u3002\u54c8\u5e0c\u8868\u7684\u7ed3\u6784\u4f53\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n

<\/span>typedef<\/span> struct<\/span> dictht<\/span> {<\/span>\n  \/\/ \u54c8\u5e0c\u8868\u6570\u7ec4<\/span>\n  dictEntry **table;\n  \/\/ \u54c8\u5e0c\u8868\u5927\u5c0f<\/span>\n  unsigned<\/span> long<\/span> size;\n  \/\/ \u54c8\u5e0c\u8868\u5927\u5c0f\u63a9\u7801\uff0c\u7528\u4e8e\u8ba1\u7b97\u7d22\u5f15\u503c size - 1,\u7528\u6765\u8ba1\u7b97\u952e\u503c\u5bf9\u653e\u5728\u54ea\u4e2a\u7d22\u5f15\u4e0a<\/span>\n  unsigned<\/span> long<\/span> sizemask;\n  \/\/ \u54c8\u5e0c\u8868\u5df2\u6709\u8282\u70b9\u7684\u6570\u91cf<\/span>\n  unsigned<\/span> long<\/span> used;\n} dictht;\n<\/code><\/pre>\n
\u54c8\u5e0c\u8868\u8282\u70b9 dictEntry<\/code> \u7684\u7ed3\u6784\u5219\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
<\/span>typedef<\/span> struct<\/span> dictEntry<\/span> {<\/span>\n  \/\/ \u952e<\/span>\n  void<\/span> *key;\n  \/\/ \u503c<\/span>\n  union<\/span> {\n    void<\/span> *val;\n    uint64_t<\/span> u64;\n    int64_t<\/span> s64;\n  }v;\n  \/\/ \u6307\u5411\u4e0b\u4e2a\u54c8\u5e0c\u8868\u8282\u70b9<\/span>\n  struct<\/span> dictEntry<\/span> *next<\/span>;<\/span>\n} dictEntry;\n<\/code><\/pre>\n
dictEntry<\/code> \u4e2d\u7684\u503c\u6709\u4e9b\u7279\u522b\uff0c\u5b83\u8868\u793a\u5176\u503c\u6709\u53ef\u80fd\u662f\u4e00\u4e2a\u6307\u9488\u6216\u8005\u662f\u4e00\u4e2a uint64_t<\/code> \u6574\u6570\uff0c\u6216\u8005\u662f\u4e00\u4e2a int64_t<\/code> \u6574\u6570\u3002<\/p>\n
\u56e0\u4e3a\u5b58\u5728 next<\/code> \u5c5e\u6027\uff0c\u5f88\u663e\u7136\u5b83\u662f\u4f7f\u7528\u94fe\u5730\u5740\u6cd5<\/code>\u89e3\u51b3\u7684\u54c8\u5e0c\u952e\u51b2\u7a81\u3002<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u770b\u4e00\u4e0b\u5b57\u5178\uff08dict\uff09\u7684\u5b9a\u4e49\uff1a<\/p>\n
<\/span>typedef<\/span> struct<\/span> dict<\/span> {<\/span>\n  \/\/ \u7c7b\u578b\u7279\u5b9a\u51fd\u6570<\/span>\n  dictType *type;\n  \/\/ \u79c1\u6709\u6570\u636e<\/span>\n  void<\/span> *privdata;\n  \/\/ \u54c8\u5e0c\u8868<\/span>\n  dictht ht[2<\/span>];\n  \/\/ rehash \u7d22\u5f15 \u5f53\u4e0d\u5728\u8fdb\u884c rehash \u7684\u65f6\u5019\uff0c\u503c\u4e3a-1<\/span>\n  int<\/span> trehashids; \n} dict;\n<\/code><\/pre>\n
\u5c5e\u6027 type<\/code> \u662f\u4e00\u4e2a\u6307\u5411 dictType<\/code> \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u6bcf\u4e2a dictType<\/code> \u4fdd\u5b58\u4e86\u4e00\u4e9b\u7528\u4e8e\u64cd\u4f5c\u7279\u5b9a\u7c7b\u578b\u952e\u503c\u5bf9\u7684\u51fd\u6570\u3002<\/p>\n
<\/span>typedef<\/span> struct<\/span> dictType<\/span> {<\/span>\n \/\/ \u8ba1\u7b97\u54c8\u5e0c\u503c\u7684\u51fd\u6570<\/span>\n unsigned<\/span> int<\/span> (*hashFunction)<\/span>(const<\/span> void<\/span> *key)<\/span><\/span>;\n \/\/ \u590d\u5236\u952e\u7684\u51fd\u6570<\/span>\n void<\/span> *(*keyDup)(void<\/span> *privdata, const<\/span> void<\/span> *key);\n \/\/ \u590d\u5236\u503c\u7684\u51fd\u6570<\/span>\n void<\/span> *(*valDup)(void<\/span> *privdata, const<\/span> void<\/span> *obj);\n \/\/ \u5bf9\u6bd4\u952e\u7684\u51fd\u6570<\/span>\n int<\/span> (*keyCompare)(void<\/span> *privdata, const<\/span> void<\/span> *key1, const<\/span> void<\/span> *key2);\n \/\/ \u9500\u6bc1\u952e\u7684\u51fd\u6570<\/span>\n void<\/span> (*valDestructor)(void<\/span> *privdata, void<\/span> *obj);\n} dictType;\n<\/code><\/pre>\n
ht<\/code> \u6570\u7ec4\u8868\u793a\u5b58\u50a8\u4e24\u4e2a\u54c8\u5e0c\u8868\uff0c\u5e73\u5e38\u60c5\u51b5\u4e0b\u53ea\u4f7f\u7528 ht[0]<\/code> \uff0c\u53ea\u6709\u5728 rehash<\/code> \u65f6\u624d\u4f1a\u4f7f\u7528\u5230 h[1]<\/code> \u548c trehashids<\/code>\u3002<\/p>\n
\u5b57\u5178\u7684\u7ed3\u6784\u5c31\u662f\uff0c\u4e00\u4e2a\u5b57\u5178\u4e2d\u6709\u4e24\u4e2a\u54c8\u5e0c\u8868\uff0c\u5e73\u65f6\u53ea\u7528\u4e00\u4e2a\u54c8\u5e0c\u8868\u3002\u53e6\u4e00\u4e2a\u54c8\u5e0c\u8868\u5728 rehash \u7684\u65f6\u5019\u4f7f\u7528\u3002\u6bcf\u4e2a\u54c8\u5e0c\u8868\u4e2d\u5b58\u5728\u4e00\u4e2a\u8282\u70b9\u6570\u7ec4\uff0c\u8282\u70b9\u5219\u7528\u4e8e\u5b58\u653e\u952e\u503c\u5bf9\u3002<\/strong><\/p>\n
<\/span>\u65b0\u589e\u952e\u503c\u5bf9<\/span><\/span><\/h3>\n
\u65b0\u589e\u952e\u503c\u5bf9\u5c31\u610f\u5473\u7740\u9700\u8981\u8ba1\u7b97\u952e\u7684\u54c8\u5e0c\u503c<\/strong>\uff0c\u4ece\u800c\u5f97\u51fa\u7d22\u5f15\u503c<\/strong>\u3002\u6839\u636e\u7d22\u5f15\u503c\u5c06\u952e\u503c\u5bf9\u7684\u54c8\u5e0c\u8282\u70b9\u653e\u5230\u54c8\u5e0c\u8868\u7684\u6307\u5b9a\u4f4d\u7f6e\u4e0a\u3002\u8ba1\u7b97\u54c8\u5e0c\u503c\u4f7f\u7528\u7684\u662f\u5b57\u5178\u7ed3\u6784\u4f53\u4e2d\u7684 type<\/code> \u4e2d\u7684\u51fd\u6570\uff0c\u5373 hash = dict->type->hashFunction(key)<\/code> \u3002\u8ba1\u7b97\u7d22\u5f15\u503c\u5219\u662f index = hash & dict->ht[x].sizemask<\/code> \uff0cx \u53d6\u51b3\u4e8e\u5f53\u524d\u4f7f\u7528\u7684\u662fht[1]\u8fd8\u662fht[2]\u3002<\/p>\n
\u4e0d\u8fc7\uff0c\u603b\u4f1a\u6709\u4e0d\u540c\u7684\u952e\u5bf9\u5e94\u76f8\u540c\u7684\u7d22\u5f15\u503c\uff0c\u4ea7\u751f\u51b2\u7a81\u3002Redis \u4e2d\u4f7f\u7528\u4e86\u5e38\u7528\u7684\u201c\u94fe\u5730\u5740\u6cd5\u201d\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5f53\u51fa\u73b0\u51b2\u7a81\u65f6\u5c31\u628a\u65b0\u8282\u70b9\u653e\u5230\u8868\u5934\u7684\u4f4d\u7f6e\u3002<\/p>\n
<\/span>Rehash<\/span><\/span><\/h2>\n
\u968f\u7740\u5b57\u5178\u4e2d\u952e\u503c\u5bf9\u6570\u91cf\u7684\u4e0d\u65ad\u53d8\u5316\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u54c8\u5e0c\u8868\u7684\u7a7a\u95f4\u5229\u7528\u7387\u4ee5\u53ca\u6548\u7387\uff0c\u5728\u54c8\u5e0c\u8868\u8fc7\u5927\u6216\u8005\u8fc7\u5c0f\u662f\u8981\u5bf9\u54c8\u5e0c\u8868\u5927\u5c0f\u8fdb\u884c\u8c03\u6574\u3002\u5982\u679c\u8fc7\u5c0f\uff0c\u5219\u4f1a\u4e0d\u65ad\u53d1\u751f\u952e\u51b2\u7a81\u5bfc\u81f4\u6548\u7387\u4f4e\u4e0b\uff0c\u5982\u679c\u8fc7\u5927\u5219\u4f1a\u6d6a\u8d39\u5b58\u50a8\u7a7a\u95f4\u3002\u6240\u4ee5\uff0c\u7ecf\u8fc7\u4e0d\u65ad\u8c03\u6574\u53ef\u4ee5\u4f7f\u5176\u7ef4\u6301\u5728\u4e00\u4e2a\u5408\u7406\u7684\u8303\u56f4\u3002<\/p>\n
<\/span>\u6b65\u9aa4<\/span><\/span><\/h3>\n
    \n
  1. \n
    \u4e3a ht[1]<\/code> \u5206\u914d\u7a7a\u95f4\uff0c\u5927\u5c0f\u53d6\u51b3\u4e8e\u662f\u6269\u5927\u54c8\u5e0c\u8868\u8fd8\u662f\u7f29\u5c0f\u54c8\u5e0c\u8868\u3002\u5982\u679c\u6269\u5927<\/strong>\uff0c\u5176\u5927\u5c0f\u4e3a\u7b2c\u4e00\u4e2a\u5927\u4e8e\u7b49\u4e8e ht[0].used * 2<\/code> \u4e14\u540c\u65f6\u4e3a2\u7684n\u6b21\u65b9\u5e42<\/code> \u7684\u503c\u3002\u5982\u679c\u7f29\u5c0f<\/strong>\uff0c\u5176\u5927\u5c0f\u4e3a\u7b2c\u4e00\u4e2a\u5927\u4e8e\u7b49\u4e8e ht[0].used<\/code> \u5176\u540c\u65f6\u4e3a 2\u7684n\u6b21\u65b9\u5e42<\/code> \u7684\u503c\u3002<\/section>\n<\/li>\n
  2. \n
    \u5c06\u4fdd\u5b58\u5728 ht[0]<\/code> \u4e2d\u6240\u6709\u7684\u952e\u503c\u5bf9\u91cd\u65b0\u8ba1\u7b97\u54c8\u5e0c\u503c\u548c\u7d22\u5f15\u503c\u540e\uff0c\u5b58\u653e\u5728 ht[1]<\/code> \u4e2d\u3002<\/section>\n<\/li>\n
  3. \n
    \u5f53\u8fc1\u79fb\u5b8c\u6240\u6709\u7684\u952e\u503c\u4e4b\u540e\uff0c\u91ca\u653e\u539f ht[0]<\/code> \u7684\u7a7a\u95f4\uff0c\u5c06\u539f h[1]<\/code> \u6539\u4e3a h0<\/code>, \u5e76\u5728 ht[1]<\/code> \u65b0\u521b\u5efa\u4e00\u4e2a\u7a7a\u767d\u54c8\u5e0c\u8868\u3002<\/section>\n<\/li>\n<\/ol>\n
    \u90a3\u4e48\u4f55\u65f6\u6269\u5c55\u54c8\u5e0c\u8868\u5927\u5c0f\u5462\uff1f<\/strong> \u4e00\u662f\u5f53\u6ca1\u6709\u5728\u6267\u884c BGSAVE<\/code> \u6216\u8005 BGREWRITEAOF<\/code> \u547d\u4ee4\u65f6\uff0c\u5e76\u4e14\u54c8\u5e0c\u8868\u7684\u8d1f\u8f7d\u56e0\u5b50\u5927\u4e8e\u7b49\u4e8e1\u65f6\u3002  \u4e8c\u662f\u5f53\u5728\u6267\u884c\u8fd9\u4fe9\u547d\u4ee4\uff0c\u4f46\u662f\u8d1f\u8f7d\u56e0\u5b50\u5927\u4e8e\u7b49\u4e8e5\u65f6\uff08\u8282\u7ea6\u5185\u5b58\uff0c\u4e0a\u8ff0\u4e24\u547d\u4ee4\u6d88\u8017\u5185\u5b58\uff09\u3002<\/p>\n
    \u8d1f\u8f7d\u56e0\u5b50\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a\u8d1f\u8f7d\u56e0\u5b50 = \u54c8\u5e0c\u8868\u4fdd\u5b58\u8282\u70b9\u6570\u91cf\uff0f\u54c8\u5e0c\u8868\u5927\u5c0f<\/p>\n
    \u90a3\u4e48\u4f55\u65f6\u7f29\u5c0f\u54c8\u5e0c\u8868\u5927\u5c0f\u5462\uff1f<\/strong> \u5f53\u54c8\u5e0c\u8868\u8d1f\u8f7d\u56e0\u5b50\u5c0f\u4e8e 0.1 \u65f6\u5219\u4f1a\u8fdb\u884c\u7f29\u5c0f\u3002<\/p>\n
    <\/span>\u6e10\u8fdb\u5f0f Rehash<\/span><\/span><\/h3>\n
    \u5176\u5b9e\u5bf9\u4e8e\u4e0a\u8ff0\u6b65\u9aa4<\/strong> 2 \uff0c\u666e\u901a\u4eba\u89c9\u5f97\u8fd9\u4e0d\u5c31\u662f\u628a\u952e\u503c\u5bf9\u91cd\u65b0\u5206\u914d\u4e00\u4e0b\u5417\uff1f\u4f46\u662f\u5982\u679c\u6b64\u65f6\u5b58\u5728\u767e\u4e07\u3001\u5343\u4e07\u751a\u81f3\u4ebf\u7ea7\u7684\u952e\u503c\u5bf9\u65f6\uff0c\u6050\u6015\u5c31\u662f\u4e0d\u662f\u4e00\u7728\u773c\u7684\u529f\u592b\u5c31\u53ef\u4ee5\u5b8c\u6210\u7684\u4e86\u3002\u5982\u679c\u975e\u5f97\u4e00\u6b21\u6027\u5b8c\u6210\uff0c\u90a3\u4e48\u53ef\u80fd\u4f1a\u5bfc\u81f4\u670d\u52a1\u5668\u7684\u4e0d\u53ef\u7528\u3002\u6240\u4ee5\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cRedis \u91c7\u7528\u4e86\u6162\u6162\u6765\u7684\u529e\u6cd5\u6e10\u8fdb\u5f0f Rehash<\/strong>\u3002<\/p>\n
    \u5176\u4e3b\u8981\u6b65\u9aa4\u4e0e\u524d\u9762\u7684\u6709\u4e9b\u76f8\u4f3c\uff0c\u53ea\u4e0d\u8fc7\u5728\u6e10\u8fdb\u5f0fRehash\u4e2d\u4f7f\u7528\u5230\u4e86 dict->trehashids<\/code> \u503c\u6765\u8bb0\u5f55\u5f53\u524drehash\u5230\u4e86\u54ea\u4e2a\u7d22\u5f15\u3002\u5728 Rehash \u671f\u95f4\uff0c\u53ef\u4ee5\u5bf9\u5b57\u5178\u6b63\u5e38\u8fdb\u884c\u589e\u52a0\u3001\u5220\u9664\u3001\u67e5\u627e\u548c\u66f4\u65b0\u3002\u7136\u540e\u540c\u65f6\u4e5f\u4f1a\u5c06  trehashids<\/code> \u4e0a\u8bb0\u5f55\u7684\u7d22\u5f15\u503c\u4e0a\u7684\u8282\u70b9\u8fc1\u79fb\u5230 h[1]<\/code> \u4e0a\u3002\u5e76\u4e14\u6240\u6709\u7684\u65b0\u589e\u8282\u70b9\u90fd\u4f1a\u653e\u5230 h[1]<\/code>\u4e2d\uff0c\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4 h[0]<\/code> \u4e2d\u7684\u8282\u70b9\u8d8a\u6765\u8d8a\u5c11\uff0c\u6700\u7ec8\u5b8c\u6210 rehash\u3002\u5176\u5b83\u7684\u64cd\u4f5c\u5219\u4f1a\u5728\u4e24\u4e2a\u8868\u4e0a\u8fdb\u884c\u3002<\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
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