\u4f5c\u4e3a\u4e00\u79cd\u5b9a\u671f\u6e05\u7406\u65e0\u6548\u6570\u636e\u7684\u91cd\u8981\u673a\u5236\uff0c\u4e3b\u952e\u5931\u6548\u5b58\u5728\u4e8e\u5927\u591a\u6570\u7f13\u5b58\u7cfb\u7edf\u4e2d\uff0cRedis \u4e5f\u4e0d\u4f8b\u5916\u3002\u5728 Redis \u63d0\u4f9b\u7684\u8bf8\u591a\u547d\u4ee4\u4e2d\uff0cEXPIRE\u3001EXPIREAT\u3001PEXPIRE\u3001PEXPIREAT \u4ee5\u53ca SETEX \u548c PSETEX \u5747\u53ef\u4ee5\u7528\u6765\u8bbe\u7f6e\u4e00\u6761 Key-Value \u5bf9\u7684\u5931\u6548\u65f6\u95f4\uff0c\u800c\u4e00\u6761 Key-Value \u5bf9\u4e00\u65e6\u88ab\u5173\u8054\u4e86\u5931\u6548\u65f6\u95f4\u5c31\u4f1a\u5728\u5230\u671f\u540e\u81ea\u52a8\u5220\u9664\uff08\u6216\u8005\u8bf4\u53d8\u5f97\u65e0\u6cd5\u8bbf\u95ee\u66f4\u4e3a\u51c6\u786e\uff09\u3002\u53ef\u4ee5\u8bf4\uff0c\u4e3b\u952e\u5931\u6548\u8fd9\u4e2a\u6982\u5ff5\u8fd8\u662f\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\u7684\uff0c\u4f46\u662f\u5728\u5177\u4f53\u5b9e\u73b0\u5230 Redis \u4e2d\u53c8\u662f\u5982\u4f55\u5462\uff1f\u6700\u8fd1\u672c\u535a\u4e3b\u5c31\u5bf9 Redis \u4e2d\u7684\u4e3b\u952e\u5931\u6548\u673a\u5236\u4ea7\u751f\u4e86\u51e0\u4e2a\u7591\u95ee\uff0c\u5e76\u6839\u636e\u8fd9\u4e9b\u7591\u95ee\u5bf9\u5176\u8fdb\u884c\u4e86\u4ed4\u7ec6\u7684\u63a2\u7a76\uff0c\u73b0\u603b\u7ed3\u6240\u5f97\u5982\u4e0b\uff0c\u4ee5\u98e8\u5404\u4f4d\u770b\u5ba2\u3002<\/p>\n
\u4e00\u3001\u5931\u6548\u65f6\u95f4\u7684\u63a7\u5236<\/p>\n
\u9664\u4e86\u8c03\u7528PERSIST\u547d\u4ee4\u5916\uff0c\u8fd8\u6709\u6ca1\u6709\u5176\u4ed6\u60c5\u51b5\u4f1a\u64a4\u9500\u4e00\u4e2a\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\uff1f\u7b54\u6848\u662f\u80af\u5b9a\u7684\u3002\u9996\u5148\uff0c\u5728\u901a\u8fc7 DEL \u547d\u4ee4\u5220\u9664\u4e00\u4e2a\u4e3b\u952e\u65f6\uff0c\u5931\u6548\u65f6\u95f4\u81ea\u7136\u4f1a\u88ab\u64a4\u9500\uff08\u8fd9\u4e0d\u662f\u5e9f\u8bdd\u4e48\uff0c\u54c8\u54c8\uff09\u3002\u5176\u6b21\uff0c\u5728\u4e00\u4e2a\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\u88ab\u66f4\u65b0\u8986\u76d6\u65f6\uff0c\u8be5\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\u4e5f\u4f1a\u88ab\u64a4\u9500\uff08\u8fd9\u8c8c\u4f3c\u4e5f\u662f\u5e9f\u8bdd\uff0c\u54c8\u54c8\uff09\u3002\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u91cc\u6240\u8bf4\u7684\u662f\u4e3b\u952e\u88ab\u66f4\u65b0\u8986\u76d6\uff0c\u800c\u4e0d\u662f\u4e3b\u952e\u5bf9\u5e94\u7684 Value \u88ab\u66f4\u65b0\u8986\u76d6\uff0c\u56e0\u6b64 SET\u3001MSET \u6216\u8005\u662f GETSET \u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e3b\u952e\u88ab\u66f4\u65b0\u8986\u76d6\uff0c\u800c\u50cf INCR\u3001DECR\u3001LPUSH\u3001HSET \u7b49\u90fd\u662f\u66f4\u65b0\u4e3b\u952e\u5bf9\u5e94\u7684\u503c\uff0c\u8fd9\u7c7b\u64cd\u4f5c\u662f\u4e0d\u4f1a\u89e6\u78b0\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\u7684\u3002\u6b64\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a\u7279\u6b8a\u7684\u547d\u4ee4\u5c31\u662f RENAME\uff0c\u5f53\u6211\u4eec\u4f7f\u7528 RENAME \u5bf9\u4e00\u4e2a\u4e3b\u952e\u8fdb\u884c\u91cd\u547d\u540d\u540e\uff0c\u4e4b\u524d\u5173\u8054\u7684\u5931\u6548\u65f6\u95f4\u4f1a\u81ea\u52a8\u4f20\u9012\u7ed9\u65b0\u7684\u4e3b\u952e\uff0c\u4f46\u662f\u5982\u679c\u4e00\u4e2a\u4e3b\u952e\u662f\u88abRENAME\u6240\u8986\u76d6\u7684\u8bdd\uff08\u5982\u4e3b\u952e hello \u53ef\u80fd\u4f1a\u88ab\u547d\u4ee4 RENAME world hello \u6240\u8986\u76d6\uff09\uff0c\u8fd9\u65f6\u88ab\u8986\u76d6\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\u4f1a\u88ab\u81ea\u52a8\u64a4\u9500\uff0c\u800c\u65b0\u7684\u4e3b\u952e\u5219\u7ee7\u7eed\u4fdd\u6301\u539f\u6765\u4e3b\u952e\u7684\u7279\u6027\u3002<\/p>\n
\u4e8c\u3001\u5931\u6548\u7684\u5185\u90e8\u5b9e\u73b0<\/p>\n
Redis \u4e2d\u7684\u4e3b\u952e\u5931\u6548\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff0c\u5373\u5931\u6548\u7684\u4e3b\u952e\u662f\u5982\u4f55\u5220\u9664\u7684\uff1f\u5b9e\u9645\u4e0a\uff0cRedis \u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\u4e24\u79cd\uff1a<\/p>\n
\u6d88\u6781\u65b9\u6cd5\uff08passive way\uff09\uff0c\u5728\u4e3b\u952e\u88ab\u8bbf\u95ee\u65f6\u5982\u679c\u53d1\u73b0\u5b83\u5df2\u7ecf\u5931\u6548\uff0c\u90a3\u4e48\u5c31\u5220\u9664\u5b83
\n\u79ef\u6781\u65b9\u6cd5\uff08active way\uff09\uff0c\u5468\u671f\u6027\u5730\u4ece\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\u4e2d\u9009\u62e9\u4e00\u90e8\u5206\u5931\u6548\u7684\u4e3b\u952e\u5220\u9664<\/p>\n
\u5931\u6548\u7684\u5185\u90e8\u8868\u793a<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u901a\u8fc7\u4ee3\u7801\u6765\u63a2\u7a76\u4e00\u4e0b\u8fd9\u4e24\u79cd\u65b9\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u4f46\u5728\u6b64\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u770b\u4e00\u770bRedis\u662f\u5982\u4f55\u7ba1\u7406\u548c\u7ef4\u62a4\u4e3b\u952e\u7684\u5427\uff08\u6ce8\uff1a\u672c\u535a\u6587\u4e2d\u7684\u6e90\u7801\u5168\u90e8\u6765\u81ea Redis-2.6.12\uff09\u3002<\/p>\n
\u3010\u4ee3\u7801\u6bb5\u4e00\u3011\u7ed9\u51fa\u4e86 Redis \u4e2d\u5173\u4e8e\u6570\u636e\u5e93\u7684\u7ed3\u6784\u4f53\u5b9a\u4e49\uff0c\u8fd9\u4e2a\u7ed3\u6784\u4f53\u5b9a\u4e49\u4e2d\u9664\u4e86 id \u4ee5\u5916\u90fd\u662f\u6307\u5411\u5b57\u5178\u7684\u6307\u9488\uff0c\u5176\u4e2d\u6211\u4eec\u53ea\u770b dict \u548c expries\uff0c\u524d\u8005\u7528\u6765\u7ef4\u62a4\u4e00\u4e2a Redis \u6570\u636e\u5e93\u4e2d\u5305\u542b\u7684\u6240\u6709 Key-Value \u5bf9\uff08\u5176\u7ed3\u6784\u53ef\u4ee5\u7406\u89e3\u4e3a dict[key]:value\uff0c\u5373\u4e3b\u952e\u4e0e\u503c\u4e4b\u95f4\u7684\u6620\u5c04\uff09\uff0c\u540e\u8005\u5219\u7528\u4e8e\u7ef4\u62a4\u4e00\u4e2a Redis \u6570\u636e\u5e93\u4e2d\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\uff08\u5176\u7ed3\u6784\u53ef\u4ee5\u7406\u89e3\u4e3a expires[key]:timeout\uff0c\u5373\u4e3b\u952e\u4e0e\u5931\u6548\u65f6\u95f4\u7684\u6620\u5c04\uff09\u3002\u5f53\u6211\u4eec\u4f7f\u7528 SETEX \u548c PSETEX \u547d\u4ee4\u5411\u7cfb\u7edf\u63d2\u5165\u6570\u636e\u65f6\uff0cRedis \u9996\u5148\u5c06 Key \u548c Value \u6dfb\u52a0\u5230 dict \u8fd9\u4e2a\u5b57\u5178\u8868\u4e2d\uff0c\u7136\u540e\u5c06 Key \u548c\u5931\u6548\u65f6\u95f4\u6dfb\u52a0\u5230 expires \u8fd9\u4e2a\u5b57\u5178\u8868\u4e2d\u3002\u5f53\u6211\u4eec\u4f7f\u7528 EXPIRE\u3001EXPIREAT\u3001PEXPIRE \u548c PEXPIREAT \u547d\u4ee4\u8bbe\u7f6e\u4e00\u4e2a\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\u65f6\uff0cRedis \u9996\u5148\u5230 dict \u8fd9\u4e2a\u5b57\u5178\u8868\u4e2d\u67e5\u627e\u8981\u8bbe\u7f6e\u7684\u4e3b\u952e\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u5c31\u5c06\u8fd9\u4e2a\u4e3b\u952e\u548c\u5931\u6548\u65f6\u95f4\u6dfb\u52a0\u5230 expires \u8fd9\u4e2a\u5b57\u5178\u8868\u3002\u7b80\u5355\u5730\u603b\u7ed3\u6765\u8bf4\u5c31\u662f\uff0c\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\u548c\u5177\u4f53\u7684\u5931\u6548\u65f6\u95f4\u5168\u90e8\u90fd\u7ef4\u62a4\u5728 expires \u8fd9\u4e2a\u5b57\u5178\u8868\u4e2d\u3002<\/p>\n
\u3010\u4ee3\u7801\u6bb5\u4e00\u3011<\/p>\n
\r\ntypedef struct redisDb {\r\n dict *dict;\r\n dict *expires;\r\n dict *blocking_keys;\r\n dict *ready_keys;\r\n dict *watched_keys;\r\n int id;\r\n} redisDb;\r\n<\/pre>\n\u6d88\u6781\u65b9\u6cd5<\/p>\n
\u5728\u5927\u81f4\u4e86\u89e3\u4e86 Redis \u662f\u5982\u4f55\u7ef4\u62a4\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\u4e4b\u540e\uff0c\u6211\u4eec\u5c31\u5148\u6765\u770b\u4e00\u770b Redis \u662f\u5982\u4f55\u5b9e\u73b0\u6d88\u6781\u5730\u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u3002\u3010\u4ee3\u7801\u6bb5\u4e8c\u3011\u7ed9\u51fa\u4e86\u4e00\u4e2a\u540d\u4e3a expireIfNeeded \u7684\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u5728\u4efb\u4f55\u8bbf\u95ee\u6570\u636e\u7684\u51fd\u6570\u4e2d\u90fd\u4f1a\u88ab\u8c03\u7528\uff0c\u4e5f\u5c31\u662f\u8bf4 Redis \u5728\u5b9e\u73b0 GET\u3001MGET\u3001HGET\u3001LRANGE \u7b49\u6240\u6709\u6d89\u53ca\u5230\u8bfb\u53d6\u6570\u636e\u7684\u547d\u4ee4\u65f6\u90fd\u4f1a\u8c03\u7528\u5b83\uff0c\u5b83\u5b58\u5728\u7684\u610f\u4e49\u5c31\u662f\u5728\u8bfb\u53d6\u6570\u636e\u4e4b\u524d\u5148\u68c0\u67e5\u4e00\u4e0b\u5b83\u6709\u6ca1\u6709\u5931\u6548\uff0c\u5982\u679c\u5931\u6548\u4e86\u5c31\u5220\u9664\u5b83\u3002\u3010\u4ee3\u7801\u6bb5\u4e8c\u3011\u4e2d\u7ed9\u51fa\u4e86 expireIfNeeded \u51fd\u6570\u7684\u6240\u6709\u76f8\u5173\u63cf\u8ff0\uff0c\u8fd9\u91cc\u5c31\u4e0d\u518d\u91cd\u590d\u5b83\u7684\u5b9e\u73b0\u65b9\u6cd5\u4e86\u3002\u8fd9\u91cc\u9700\u8981\u8bf4\u660e\u7684\u662f\u5728 expireIfNeeded \u51fd\u6570\u4e2d\u8c03\u7528\u7684\u53e6\u5916\u4e00\u4e2a\u51fd\u6570 propagateExpire\uff0c\u8fd9\u4e2a\u51fd\u6570\u7528\u6765\u5728\u6b63\u5f0f\u5220\u9664\u5931\u6548\u4e3b\u952e\u4e4b\u524d\u5e7f\u64ad\u8fd9\u4e2a\u4e3b\u952e\u5df2\u7ecf\u5931\u6548\u7684\u4fe1\u606f\uff0c\u8fd9\u4e2a\u4fe1\u606f\u4f1a\u4f20\u64ad\u5230\u4e24\u4e2a\u76ee\u7684\u5730\uff1a\u4e00\u4e2a\u662f\u53d1\u9001\u5230 AOF\u6587\u4ef6\uff0c\u5c06\u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u8fd9\u4e00\u64cd\u4f5c\u4ee5 DEL Key \u7684\u6807\u51c6\u547d\u4ee4\u683c\u5f0f\u8bb0\u5f55\u4e0b\u6765\uff1b\u53e6\u4e00\u4e2a\u5c31\u662f\u53d1\u9001\u5230\u5f53\u524d Redis \u670d\u52a1\u5668\u7684\u6240\u6709 Slave\uff0c\u540c\u6837\u5c06\u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u8fd9\u4e00\u64cd\u4f5c\u4ee5 DEL Key \u7684\u6807\u51c6\u547d\u4ee4\u683c\u5f0f\u544a\u77e5\u8fd9\u4e9b Slave \u5220\u9664\u5404\u81ea\u7684\u5931\u6548\u4e3b\u952e\u3002\u4ece\u4e2d\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\uff0c\u6240\u6709\u4f5c\u4e3a Slave \u6765\u8fd0\u884c\u7684 Redis \u670d\u52a1\u5668\u5e76\u4e0d\u9700\u8981\u901a\u8fc7\u6d88\u6781\u65b9\u6cd5\u6765\u5220\u9664\u5931\u6548\u4e3b\u952e\uff0c\u5b83\u4eec\u53ea\u9700\u8981\u5bf9 Master \u552f\u547d\u662f\u4ece\u5c31 OK \u4e86\uff01<\/p>\n
\u3010\u4ee3\u7801\u6bb5\u4e8c\u3011<\/p>\n
\r\nint expireIfNeeded(redisDb *db, robj *key) {\r\n \/\/\u83b7\u53d6\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\r\n long long when = getExpire(db,key);\r\n \/\/\u5047\u5982\u5931\u6548\u65f6\u95f4\u4e3a\u8d1f\u6570\uff0c\u8bf4\u660e\u8be5\u4e3b\u952e\u672a\u8bbe\u7f6e\u5931\u6548\u65f6\u95f4\uff08\u5931\u6548\u65f6\u95f4\u9ed8\u8ba4\u4e3a-1\uff09\uff0c\u76f4\u63a5\u8fd4\u56de0\r\n if (when < 0) return 0;\r\n \/\/\u5047\u5982Redis\u670d\u52a1\u5668\u6b63\u5728\u4eceRDB\u6587\u4ef6\u4e2d\u52a0\u8f7d\u6570\u636e\uff0c\u6682\u65f6\u4e0d\u8fdb\u884c\u5931\u6548\u4e3b\u952e\u7684\u5220\u9664\uff0c\u76f4\u63a5\u8fd4\u56de0\r\n if (server.loading) return 0;\r\n \/\/\u5047\u5982\u5f53\u524d\u7684Redis\u670d\u52a1\u5668\u662f\u4f5c\u4e3aSlave\u8fd0\u884c\u7684\uff0c\u90a3\u4e48\u4e0d\u8fdb\u884c\u5931\u6548\u4e3b\u952e\u7684\u5220\u9664\uff0c\u56e0\u4e3aSlave\r\n \/\/\u4e0a\u5931\u6548\u4e3b\u952e\u7684\u5220\u9664\u662f\u7531Master\u6765\u63a7\u5236\u7684\uff0c\u4f46\u662f\u8fd9\u91cc\u4f1a\u5c06\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\u4e0e\u5f53\u524d\u65f6\u95f4\u8fdb\u884c\r\n \/\/\u4e00\u4e0b\u5bf9\u6bd4\uff0c\u4ee5\u544a\u77e5\u8c03\u7528\u8005\u6307\u5b9a\u7684\u4e3b\u952e\u662f\u5426\u5df2\u7ecf\u5931\u6548\u4e86\r\n if (server.masterhost != NULL) {\r\n return mstime() > when;\r\n }\r\n \/\/\u5982\u679c\u4ee5\u4e0a\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\uff0c\u5c31\u5c06\u4e3b\u952e\u7684\u5931\u6548\u65f6\u95f4\u4e0e\u5f53\u524d\u65f6\u95f4\u8fdb\u884c\u5bf9\u6bd4\uff0c\u5982\u679c\u53d1\u73b0\u6307\u5b9a\u7684\u4e3b\u952e\r\n \/\/\u8fd8\u672a\u5931\u6548\u5c31\u76f4\u63a5\u8fd4\u56de0\r\n if (mstime() <= when) return 0;\r\n \/\/\u5982\u679c\u53d1\u73b0\u4e3b\u952e\u786e\u5b9e\u5df2\u7ecf\u5931\u6548\u4e86\uff0c\u90a3\u4e48\u9996\u5148\u66f4\u65b0\u5173\u4e8e\u5931\u6548\u4e3b\u952e\u7684\u7edf\u8ba1\u4e2a\u6570\uff0c\u7136\u540e\u5c06\u8be5\u4e3b\u952e\u5931\r\n \/\/\u6548\u7684\u4fe1\u606f\u8fdb\u884c\u5e7f\u64ad\uff0c\u6700\u540e\u5c06\u8be5\u4e3b\u952e\u4ece\u6570\u636e\u5e93\u4e2d\u5220\u9664\r\n server.stat_expiredkeys++;\r\n propagateExpire(db,key);\r\n return dbDelete(db,key);\r\n}\r\n<\/pre>\n\u3010\u4ee3\u7801\u6bb5\u4e09\u3011<\/p>\n
\r\nvoid propagateExpire(redisDb *db, robj *key) {\r\n robj *argv[2];\r\n \/\/shared.del\u662f\u5728Redis\u670d\u52a1\u5668\u542f\u52a8\u4e4b\u521d\u5c31\u5df2\u7ecf\u521d\u59cb\u5316\u597d\u7684\u4e00\u4e2a\u5e38\u7528Redis\u5bf9\u8c61\uff0c\u5373DEL\u547d\u4ee4\r\n argv[0] = shared.del;\r\n argv[1] = key;\r\n incrRefCount(argv[0]);\r\n incrRefCount(argv[1]);\r\n \/\/\u68c0\u67e5Redis\u670d\u52a1\u5668\u662f\u5426\u5f00\u542f\u4e86AOF\uff0c\u5982\u679c\u5f00\u542f\u4e86\u5c31\u4e3a\u5931\u6548\u4e3b\u952e\u8bb0\u5f55\u4e00\u6761DEL\u65e5\u5fd7\r\n if (server.aof_state != REDIS_AOF_OFF)\r\n feedAppendOnlyFile(server.delCommand,db->id,argv,2);\r\n \/\/\u68c0\u67e5Redis\u670d\u52a1\u5668\u662f\u5426\u62e5\u6709Slave\uff0c\u5982\u679c\u662f\u5c31\u5411\u6240\u6709Slave\u53d1\u9001DEL\u5931\u6548\u4e3b\u952e\u7684\u547d\u4ee4\uff0c\u8fd9\u5c31\u662f\r\n \/\/\u4e0a\u9762expireIfNeeded\u51fd\u6570\u4e2d\u53d1\u73b0\u81ea\u5df1\u662fSlave\u65f6\u65e0\u9700\u4e3b\u52a8\u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u539f\u56e0\u4e86\uff0c\u56e0\u4e3a\u5b83\r\n \/\/\u53ea\u9700\u542c\u4eceMaster\u53d1\u9001\u8fc7\u6765\u7684\u547d\u4ee4\u5c31OK\u4e86\r\n if (listLength(server.slaves))\r\n replicationFeedSlaves(server.slaves,db->id,argv,2);\r\n decrRefCount(argv[0]);\r\n decrRefCount(argv[1]);\r\n}\r\n<\/pre>\n\u79ef\u6781\u65b9\u6cd5<\/p>\n
\u4ee5\u4e0a\u6211\u4eec\u901a\u8fc7\u5bf9 expireIfNeeded \u51fd\u6570\u7684\u4ecb\u7ecd\u4e86\u89e3\u4e86 Redis \u662f\u5982\u4f55\u4ee5\u4e00\u79cd\u6d88\u6781\u7684\u65b9\u5f0f\u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\uff0c\u4f46\u662f\u4ec5\u4ec5\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u663e\u7136\u662f\u4e0d\u591f\u7684\uff0c\u56e0\u4e3a\u5982\u679c\u67d0\u4e9b\u5931\u6548\u7684\u4e3b\u952e\u8fdf\u8fdf\u7b49\u4e0d\u5230\u518d\u6b21\u8bbf\u95ee\u7684\u8bdd\uff0cRedis \u5c31\u6c38\u8fdc\u4e0d\u4f1a\u77e5\u9053\u8fd9\u4e9b\u4e3b\u952e\u5df2\u7ecf\u5931\u6548\uff0c\u4e5f\u5c31\u6c38\u8fdc\u4e5f\u4e0d\u4f1a\u5220\u9664\u5b83\u4eec\u4e86\uff0c\u8fd9\u65e0\u7591\u4f1a\u5bfc\u81f4\u5185\u5b58\u7a7a\u95f4\u7684\u6d6a\u8d39\u3002\u56e0\u6b64\uff0cRedis \u8fd8\u51c6\u5907\u4e86\u4e00\u62db\u79ef\u6781\u7684\u5220\u9664\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5229\u7528 Redis \u7684\u65f6\u95f4\u4e8b\u4ef6\u6765\u5b9e\u73b0\uff0c\u5373\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u5c31\u4e2d\u65ad\u4e00\u4e0b\u5b8c\u6210\u4e00\u4e9b\u6307\u5b9a\u64cd\u4f5c\uff0c\u5176\u4e2d\u5c31\u5305\u62ec\u68c0\u67e5\u5e76\u5220\u9664\u5931\u6548\u4e3b\u952e\u3002\u8fd9\u91cc\u6211\u4eec\u8bf4\u7684\u65f6\u95f4\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u5c31\u662f serverCron\uff0c\u5b83\u5728 Redis \u670d\u52a1\u5668\u542f\u52a8\u65f6\u521b\u5efa\uff0c\u6bcf\u79d2\u7684\u6267\u884c\u6b21\u6570\u7531\u5b8f\u5b9a\u4e49 REDIS_DEFAULT_HZ \u6765\u6307\u5b9a\uff0c\u9ed8\u8ba4\u6bcf\u79d2\u949f\u6267\u884c10\u6b21\u3002\u3010\u4ee3\u7801\u6bb5\u56db\u3011\u7ed9\u51fa\u8be5\u65f6\u95f4\u4e8b\u4ef6\u521b\u5efa\u65f6\u7684\u7a0b\u5e8f\u4ee3\u7801\uff0c\u8be5\u4ee3\u7801\u5728 redis.c\u6587\u4ef6\u7684 initServer \u51fd\u6570\u4e2d\u3002\u5b9e\u9645\u4e0a\uff0cserverCron \u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\u4e0d\u4ec5\u8981\u8fdb\u884c\u5931\u6548\u4e3b\u952e\u7684\u68c0\u67e5\u4e0e\u5220\u9664\uff0c\u8fd8\u8981\u8fdb\u884c\u7edf\u8ba1\u4fe1\u606f\u7684\u66f4\u65b0\u3001\u5ba2\u6237\u7aef\u8fde\u63a5\u8d85\u65f6\u7684\u63a7\u5236\u3001BGSAVE \u548c AOF \u7684\u89e6\u53d1\u7b49\u7b49\uff0c\u8fd9\u91cc\u6211\u4eec\u4ec5\u5173\u6ce8\u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u51fd\u6570 activeExpireCycle\u3002<\/p>\n
\u3010\u4ee3\u7801\u6bb5\u56db\u3011<\/p>\n
\r\nif(aeCreateTimeEvent(server.el, 1, serverCron, NULL, NULL) == AE_ERR) {\r\n redisPanic("create time event failed");\r\n exit(1);\r\n}\r\n<\/pre>\n\u3010\u4ee3\u7801\u6bb5\u4e94\u3011\u7ed9\u51fa\u4e86\u51fd\u6570 activeExpireCycle \u7684\u5b9e\u73b0\u53ca\u5176\u8be6\u7ec6\u63cf\u8ff0\uff0c\u5176\u4e3b\u8981\u5b9e\u73b0\u539f\u7406\u5c31\u662f\u904d\u5386\u5904\u7406 Redis \u670d\u52a1\u5668\u4e2d\u6bcf\u4e2a\u6570\u636e\u5e93\u7684 expires \u5b57\u5178\u8868\u4e2d\uff0c\u4ece\u4e2d\u5c1d\u8bd5\u7740\u968f\u673a\u62bd\u6837 REDIS_EXPIRELOOKUPS_PER_CRON\uff08\u9ed8\u8ba4\u503c\u4e3a10\uff09\u4e2a\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\uff0c\u68c0\u67e5\u5b83\u4eec\u662f\u5426\u5df2\u7ecf\u5931\u6548\u5e76\u5220\u9664\u6389\u5931\u6548\u7684\u4e3b\u952e\uff0c\u5982\u679c\u5931\u6548\u7684\u4e3b\u952e\u4e2a\u6570\u5360\u672c\u6b21\u62bd\u6837\u4e2a\u6570\u7684\u6bd4\u4f8b\u8d85\u8fc725%\uff0cRedis \u4f1a\u8ba4\u4e3a\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684\u5931\u6548\u4e3b\u952e\u4f9d\u7136\u5f88\u591a\uff0c\u6240\u4ee5\u5b83\u4f1a\u7ee7\u7eed\u8fdb\u884c\u4e0b\u4e00\u8f6e\u7684\u968f\u673a\u62bd\u6837\u548c\u5220\u9664\uff0c\u76f4\u5230\u521a\u624d\u7684\u6bd4\u4f8b\u4f4e\u4e8e25%\u624d\u505c\u6b62\u5bf9\u5f53\u524d\u6570\u636e\u5e93\u7684\u5904\u7406\uff0c\u8f6c\u5411\u4e0b\u4e00\u4e2a\u6570\u636e\u5e93\u3002\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cactiveExpireCycle \u51fd\u6570\u4e0d\u4f1a\u8bd5\u56fe\u4e00\u6b21\u6027\u5904\u7406Redis\u4e2d\u7684\u6240\u6709\u6570\u636e\u5e93\uff0c\u800c\u662f\u6700\u591a\u53ea\u5904\u7406 REDIS_DBCRON_DBS_PER_CALL\uff08\u9ed8\u8ba4\u503c\u4e3a16\uff09\uff0c\u6b64\u5916 activeExpireCycle \u51fd\u6570\u8fd8\u6709\u5904\u7406\u65f6\u95f4\u4e0a\u7684\u9650\u5236\uff0c\u4e0d\u662f\u60f3\u6267\u884c\u591a\u4e45\u5c31\u6267\u884c\u591a\u4e45\uff0c\u51e1\u6b64\u79cd\u79cd\u90fd\u53ea\u6709\u4e00\u4e2a\u76ee\u7684\uff0c\u90a3\u5c31\u662f\u907f\u514d\u5931\u6548\u4e3b\u952e\u5220\u9664\u5360\u7528\u8fc7\u591a\u7684CPU\u8d44\u6e90\u3002\u3010\u4ee3\u7801\u6bb5\u4e94\u3011\u6709\u5bf9 activeExpireCycle \u6240\u6709\u4ee3\u7801\u7684\u8be6\u7ec6\u63cf\u8ff0\uff0c\u4ece\u4e2d\u53ef\u4ee5\u4e86\u89e3\u8be5\u51fd\u6570\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u6cd5\u3002<\/p>\n
\u3010\u4ee3\u7801\u6bb5\u4e94\u3011<\/p>\n
\r\nvoid activeExpireCycle(void) {\r\n \/\/\u56e0\u4e3a\u6bcf\u6b21\u8c03\u7528activeExpireCycle\u51fd\u6570\u4e0d\u4f1a\u4e00\u6b21\u6027\u68c0\u67e5\u6240\u6709Redis\u6570\u636e\u5e93\uff0c\u6240\u4ee5\u9700\u8981\u8bb0\u5f55\u4e0b\r\n \/\/\u6bcf\u6b21\u51fd\u6570\u8c03\u7528\u5904\u7406\u7684\u6700\u540e\u4e00\u4e2aRedis\u6570\u636e\u5e93\u7684\u7f16\u53f7\uff0c\u8fd9\u6837\u4e0b\u6b21\u8c03\u7528activeExpireCycle\u51fd\u6570\r\n \/\/\u8fd8\u53ef\u4ee5\u4ece\u8fd9\u4e2a\u6570\u636e\u5e93\u5f00\u59cb\u7ee7\u7eed\u5904\u7406\uff0c\u8fd9\u5c31\u662fcurrent_db\u88ab\u58f0\u660e\u4e3astatic\u7684\u539f\u56e0\uff0c\u800c\u53e6\u5916\u4e00\r\n \/\/\u4e2a\u53d8\u91cftimelimit_exit\u662f\u4e3a\u4e86\u8bb0\u5f55\u4e0a\u4e00\u6b21\u8c03\u7528activeExpireCycle\u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\u662f\u5426\u8fbe\r\n \/\/\u5230\u65f6\u95f4\u9650\u5236\u4e86\uff0c\u6240\u4ee5\u4e5f\u9700\u8981\u58f0\u660e\u4e3astatic\r\n static unsigned int current_db = 0;\r\n static int timelimit_exit = 0;\r\n unsigned int j, iteration = 0;\r\n \/\/\u6bcf\u6b21\u8c03\u7528activeExpireCycle\u51fd\u6570\u5904\u7406\u7684Redis\u6570\u636e\u5e93\u4e2a\u6570\u4e3aREDIS_DBCRON_DBS_PER_CALL\r\n unsigned int dbs_per_call = REDIS_DBCRON_DBS_PER_CALL;\r\n long long start = ustime(), timelimit;\r\n \/\/\u5982\u679c\u5f53\u524dRedis\u670d\u52a1\u5668\u4e2d\u7684\u6570\u636e\u5e93\u4e2a\u6570\u5c0f\u4e8eREDIS_DBCRON_DBS_PER_CALL\uff0c\u5219\u5904\u7406\u5168\u90e8\u6570\u636e\u5e93\uff0c\r\n \/\/\u5982\u679c\u4e0a\u4e00\u6b21\u8c03\u7528activeExpireCycle\u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\u8fbe\u5230\u4e86\u65f6\u95f4\u9650\u5236\uff0c\u8bf4\u660e\u5931\u6548\u4e3b\u952e\u8f83\u591a\uff0c\u4e5f\r\n \/\/\u4f1a\u9009\u62e9\u5904\u7406\u5168\u90e8\u6570\u636e\u5e93\r\n if (dbs_per_call > server.dbnum || timelimit_exit)\r\n dbs_per_call = server.dbnum;\r\n \/\/\u6267\u884cactiveExpireCycle\u51fd\u6570\u7684\u6700\u957f\u65f6\u95f4\uff08\u4ee5\u5fae\u79d2\u8ba1\uff09\uff0c\u5176\u4e2dREDIS_EXPIRELOOKUPS_TIME_PERC\r\n \/\/\u662f\u5355\u4f4d\u65f6\u95f4\u5185\u80fd\u591f\u5206\u914d\u7ed9activeExpireCycle\u51fd\u6570\u6267\u884c\u7684CPU\u65f6\u95f4\u6bd4\u4f8b\uff0c\u9ed8\u8ba4\u503c\u4e3a25\uff0cserver.hz\r\n \/\/\u5373\u4e3a\u4e00\u79d2\u5185activeExpireCycle\u7684\u8c03\u7528\u6b21\u6570\uff0c\u6240\u4ee5\u8fd9\u4e2a\u8ba1\u7b97\u516c\u5f0f\u66f4\u660e\u767d\u7684\u5199\u6cd5\u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff0c\u5373\r\n (1000000 * (REDIS_EXPIRELOOKUPS_TIME_PERC \/ 100)) \/ server.hz\r\n timelimit = 1000000*REDIS_EXPIRELOOKUPS_TIME_PERC\/server.hz\/100;\r\n timelimit_exit = 0;\r\n if (timelimit <= 0) timelimit = 1;\r\n \/\/\u904d\u5386\u5904\u7406\u6bcf\u4e2aRedis\u6570\u636e\u5e93\u4e2d\u7684\u5931\u6548\u6570\u636e\r\n for (j = 0; j < dbs_per_call; j++) {\r\n int expired;\r\n redisDb *db = server.db+(current_db % server.dbnum);\r\n \/\/\u6b64\u5904\u7acb\u523b\u5c31\u5c06current_db\u52a0\u4e00\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u5373\u4f7f\u8fd9\u6b21\u65e0\u6cd5\u5728\u65f6\u95f4\u9650\u5236\u5185\u5220\u9664\u5b8c\u6240\u6709\u5f53\u524d\r\n \/\/\u6570\u636e\u5e93\u4e2d\u7684\u5931\u6548\u4e3b\u952e\uff0c\u4e0b\u4e00\u6b21\u8c03\u7528activeExpireCycle\u4e00\u6837\u4f1a\u4ece\u4e0b\u4e00\u4e2a\u6570\u636e\u5e93\u5f00\u59cb\u5904\u7406\uff0c\r\n \/\/\u4ece\u800c\u4fdd\u8bc1\u6bcf\u4e2a\u6570\u636e\u5e93\u90fd\u6709\u88ab\u5904\u7406\u7684\u673a\u4f1a\r\n current_db++;\r\n \/\/\u5f00\u59cb\u5904\u7406\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684\u5931\u6548\u4e3b\u952e\r\n do {\r\n unsigned long num, slots;\r\n long long now;\r\n \/\/\u5982\u679cexpires\u5b57\u5178\u8868\u5927\u5c0f\u4e3a0\uff0c\u8bf4\u660e\u8be5\u6570\u636e\u5e93\u4e2d\u6ca1\u6709\u8bbe\u7f6e\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\uff0c\u76f4\u63a5\u68c0\u67e5\u4e0b\r\n \/\/\u4e00\u6570\u636e\u5e93\r\n if ((num = dictSize(db->expires)) == 0) break;\r\n\r\n slots = dictSlots(db->expires);\r\n now = mstime();\r\n \/\/\u5982\u679cexpires\u5b57\u5178\u8868\u4e0d\u4e3a\u7a7a\uff0c\u4f46\u662f\u5176\u586b\u5145\u7387\u4e0d\u8db31%\uff0c\u90a3\u4e48\u968f\u673a\u9009\u62e9\u4e3b\u952e\u8fdb\u884c\u68c0\u67e5\u7684\u4ee3\u4ef7\r\n \/\/\u4f1a\u5f88\u9ad8\uff0c\u6240\u4ee5\u8fd9\u91cc\u76f4\u63a5\u68c0\u67e5\u4e0b\u4e00\u6570\u636e\u5e93\r\n if (num && slots > DICT_HT_INITIAL_SIZE &&\r\n (num*100\/slots < 1)) break;\r\n expired = 0;\r\n \/\/\u5982\u679cexpires\u5b57\u5178\u8868\u4e2d\u7684entry\u4e2a\u6570\u4e0d\u8db3\u4ee5\u8fbe\u5230\u62bd\u6837\u4e2a\u6570\uff0c\u5219\u9009\u62e9\u5168\u90e8key\u4f5c\u4e3a\u62bd\u6837\u6837\u672c\r\n if (num > REDIS_EXPIRELOOKUPS_PER_CRON)\r\n num = REDIS_EXPIRELOOKUPS_PER_CRON;\r\n while (num--) {\r\n dictEntry *de;\r\n long long t;\r\n \/\/\u968f\u673a\u83b7\u53d6\u4e00\u4e2a\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\uff0c\u68c0\u67e5\u5176\u662f\u5426\u5df2\u7ecf\u5931\u6548\r\n if ((de = dictGetRandomKey(db->expires)) == NULL) break;\r\n t = dictGetSignedIntegerVal(de);\r\n if (now > t) {\r\n \/\/\u53d1\u73b0\u8be5\u4e3b\u952e\u786e\u5b9e\u5df2\u7ecf\u5931\u6548\uff0c\u5220\u9664\u8be5\u4e3b\u952e\r\n sds key = dictGetKey(de);\r\n robj *keyobj = createStringObject(key,sdslen(key));\r\n \/\/\u540c\u6837\u8981\u5728\u5220\u9664\u524d\u5e7f\u64ad\u8be5\u4e3b\u952e\u7684\u5931\u6548\u4fe1\u606f\r\n propagateExpire(db,keyobj);\r\n dbDelete(db,keyobj);\r\n decrRefCount(keyobj);\r\n expired++;\r\n server.stat_expiredkeys++;\r\n }\r\n }\r\n \/\/\u6bcf\u8fdb\u884c\u4e00\u6b21\u62bd\u6837\u5220\u9664\u540e\u5bf9iteration\u52a0\u4e00\uff0c\u6bcf16\u6b21\u62bd\u6837\u5220\u9664\u540e\u68c0\u67e5\u672c\u6b21\u6267\u884c\u65f6\u95f4\u662f\u5426\r\n \/\/\u5df2\u7ecf\u8fbe\u5230\u65f6\u95f4\u9650\u5236\uff0c\u5982\u679c\u5df2\u8fbe\u5230\u65f6\u95f4\u9650\u5236\uff0c\u5219\u8bb0\u5f55\u672c\u6b21\u6267\u884c\u8fbe\u5230\u65f6\u95f4\u9650\u5236\u5e76\u9000\u51fa\r\n iteration++;\r\n if ((iteration & 0xf) == 0 &&\r\n (ustime()-start) > timelimit)\r\n {\r\n timelimit_exit = 1;\r\n return;\r\n }\r\n \/\/\u5982\u679c\u5931\u6548\u7684\u4e3b\u952e\u6570\u5360\u62bd\u6837\u6570\u7684\u767e\u5206\u6bd4\u5927\u4e8e25%\uff0c\u5219\u7ee7\u7eed\u62bd\u6837\u5220\u9664\u8fc7\u7a0b\r\n } while (expired > REDIS_EXPIRELOOKUPS_PER_CRON\/4);\r\n }\r\n}\r\n<\/pre>\n\u4e09\u3001Memcached \u5220\u9664\u5931\u6548\u4e3b\u952e\u7684\u65b9\u6cd5\u4e0e Redis \u6709\u4f55\u5f02\u540c\uff1f<\/p>\n
\u9996\u5148\uff0cMemcached \u5728\u5220\u9664\u5931\u6548\u4e3b\u952e\u65f6\u4e5f\u662f\u91c7\u7528\u7684\u6d88\u6781\u65b9\u6cd5\uff0c\u5373 Memcached \u5185\u90e8\u4e5f\u4e0d\u4f1a\u76d1\u89c6\u4e3b\u952e\u662f\u5426\u5931\u6548\uff0c\u800c\u662f\u5728\u901a\u8fc7 Get \u8bbf\u95ee\u4e3b\u952e\u65f6\u624d\u4f1a\u68c0\u67e5\u5176\u662f\u5426\u5df2\u7ecf\u5931\u6548\u3002\u5176\u6b21\uff0cMemcached \u4e0e Redis \u5728\u4e3b\u952e\u5931\u6548\u673a\u5236\u4e0a\u7684\u6700\u5927\u4e0d\u540c\u662f\uff0cMemcached \u4e0d\u4f1a\u50cf Redis \u90a3\u6837\u771f\u6b63\u5730\u53bb\u5220\u9664\u5931\u6548\u7684\u4e3b\u952e\uff0c\u800c\u53ea\u662f\u7b80\u5355\u5730\u5c06\u5931\u6548\u4e3b\u952e\u5360\u7528\u7684\u7a7a\u95f4\u56de\u6536\u3002\u8fd9\u6837\u5f53\u6709\u65b0\u7684\u6570\u636e\u5199\u5165\u5230\u7cfb\u7edf\u4e2d\u65f6\uff0cMemcached \u4f1a\u4f18\u5148\u4f7f\u7528\u90a3\u4e9b\u5931\u6548\u4e3b\u952e\u7684\u7a7a\u95f4\u3002\u5982\u679c\u5931\u6548\u4e3b\u952e\u7684\u7a7a\u95f4\u7528\u5149\u4e86\uff0cMemcached \u8fd8\u53ef\u4ee5\u901a\u8fc7 LRU \u673a\u5236\u6765\u56de\u6536\u90a3\u4e9b\u957f\u671f\u5f97\u4e0d\u5230\u8bbf\u95ee\u7684\u7a7a\u95f4\uff0c\u56e0\u6b64 Memcached \u5e76\u4e0d\u9700\u8981\u50cf Redis \u4e2d\u90a3\u6837\u7684\u5468\u671f\u6027\u5220\u9664\u64cd\u4f5c\uff0c\u8fd9\u4e5f\u662f\u7531 Memcached \u4f7f\u7528\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236\u51b3\u5b9a\u7684\u3002\u540c\u65f6\uff0c\u8fd9\u91cc\u9700\u8981\u6307\u51fa\u7684\u662f Redis \u5728\u51fa\u73b0 OOM \u65f6\u540c\u6837\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e maxmemory-policy \u8fd9\u4e2a\u53c2\u6570\u6765\u51b3\u5b9a\u662f\u5426\u91c7\u7528 LRU \u673a\u5236\u6765\u56de\u6536\u5185\u5b58\u7a7a\u95f4\uff08\u611f\u8c22@Jonathan_Dai \u540c\u5b66\u5728\u300aRedis\u7684LRU\u673a\u5236\u300b\u4e2d\u5bf9\u539f\u6587\u7684\u6307\u6b63\uff09\u3002<\/p>\n
\u56db\u3001Redis \u7684\u4e3b\u952e\u5931\u6548\u673a\u5236\u4f1a\u4e0d\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\uff1f<\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u5bf9 Redis \u4e3b\u952e\u5931\u6548\u673a\u5236\u7684\u4ecb\u7ecd\uff0c\u6211\u4eec\u77e5\u9053\u867d\u7136 Redis \u4f1a\u5b9a\u671f\u5730\u68c0\u67e5\u8bbe\u7f6e\u4e86\u5931\u6548\u65f6\u95f4\u7684\u4e3b\u952e\u5e76\u5220\u9664\u5df2\u7ecf\u5931\u6548\u7684\u4e3b\u952e\uff0c\u4f46\u662f\u901a\u8fc7\u5bf9\u6bcf\u6b21\u5904\u7406\u6570\u636e\u5e93\u4e2a\u6570\u7684\u9650\u5236\u3001activeExpireCycle \u51fd\u6570\u5728\u4e00\u79d2\u949f\u5185\u6267\u884c\u6b21\u6570\u7684\u9650\u5236\u3001\u5206\u914d\u7ed9 activeExpireCycle \u51fd\u6570CPU\u65f6\u95f4\u7684\u9650\u5236\u3001\u7ee7\u7eed\u5220\u9664\u4e3b\u952e\u7684\u5931\u6548\u4e3b\u952e\u6570\u767e\u5206\u6bd4\u7684\u9650\u5236\uff0cRedis \u5df2\u7ecf\u5927\u5927\u964d\u4f4e\u4e86\u4e3b\u952e\u5931\u6548\u673a\u5236\u5bf9\u7cfb\u7edf\u6574\u4f53\u6027\u80fd\u7684\u5f71\u54cd\uff0c\u4f46\u662f\u5982\u679c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u51fa\u73b0\u5927\u91cf\u4e3b\u952e\u5728\u77ed\u65f6\u95f4\u5185\u540c\u65f6\u5931\u6548\u7684\u60c5\u51b5\u8fd8\u662f\u4f1a\u4f7f\u5f97\u7cfb\u7edf\u7684\u54cd\u5e94\u80fd\u529b\u964d\u4f4e\uff0c\u6240\u4ee5\u8fd9\u79cd\u60c5\u51b5\u65e0\u7591\u5e94\u8be5\u907f\u514d\u3002<\/p>\n
\u53c2\u8003\u6587\u732e\u94fe\u63a5\uff1a<\/p>\n
http:\/\/redis.io\/commands\/expire
\nhttp:\/\/redis.io\/topics\/latency
\nhttp:\/\/www.cppblog.com\/richbirdandy\/archive\/2011\/11\/29\/161184.html
\nhttp:\/\/www.cnblogs.com\/tangtianfly\/archive\/2012\/05\/02\/2479315.html<\/p>\n
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