{"id":5273,"date":"2021-08-31T09:47:26","date_gmt":"2021-08-31T01:47:26","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5273"},"modified":"2021-08-31T09:47:26","modified_gmt":"2021-08-31T01:47:26","slug":"%e6%9c%80%e6%96%b0-redis-%e5%b8%b8%e8%a7%81%e7%83%ad%e9%97%a8%e9%9d%a2%e8%af%95%e9%a2%98%e8%bf%9b%e9%98%b6%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5273","title":{"rendered":"\u6700\u65b0 Redis \u5e38\u89c1\u70ed\u95e8\u9762\u8bd5\u9898\u8fdb\u9636\u6307\u5357"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">redis\u6570\u636e\u7c7b\u578b\u5256\u6790<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">string<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">sds\u6570\u636e\u7ed3\u6784\uff0c\u91c7\u7528\u7a7a\u95f4\u9884\u5206\u914d\u548c\u60f0\u6027\u7a7a\u95f4\u91ca\u653e\u6765\u63d0\u5347\u6548\u7387\uff0c\u7f3a\u70b9\u5c31\u662f\u8017\u8d39\u5185\u5b58\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct sdshdr {\n    int len; \/\/\u957f\u5ea6\n    int free; \/\/\u5269\u4f59\u7a7a\u95f4\n    char buf[]; \/\/\u5b57\u7b26\u4e32\u6570\u7ec4\n};<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u7a7a\u95f4\u9884\u5206\u914d\u300d<\/strong>\uff1a\u5f53\u4e00\u4e2asds\u88ab\u4fee\u6539\u6210\u66f4\u957f\u7684 buf \u65f6\uff0c\u9664\u4e86\u4f1a\u7533\u8bf7\u672c\u8eab\u9700\u8981\u7684\u5185\u5b58\u5916\uff0c\u8fd8\u4f1a\u989d\u5916\u7533\u8bf7\u4e00\u4e9b\u7a7a\u95f4\u3002<br>\n<strong>\u300c\u60f0\u6027\u7a7a\u95f4\u300d<\/strong>\uff1a\u5f53\u4e00\u4e2asds\u88ab\u4fee\u6539\u6210\u66f4\u77ed\u7684 buf \u65f6\uff0c\u5e76\u4e0d\u4f1a\u628a\u591a\u4f59\u7684\u5185\u5b58\u8fd8\u56de\u53bb\uff0c\u800c\u662f\u4f1a\u4fdd\u5b58\u8d77\u6765\u3002<br>\n<strong>\u300c\u603b\u7ed3\u300d<\/strong>\uff1a\u8fd9\u79cd\u8bbe\u8ba1\u7684\u6838\u5fc3\u601d\u60f3\u5c31\u662f\u7a7a\u95f4\u6362\u65f6\u95f4\uff0c\u53ea\u8981 <code>free<\/code>\u8fd8\u5269\u4f59\u8db3\u591f\u7684\u7a7a\u95f4\u65f6\uff0c\u4e0b\u6b21 string \u53d8\u957f\u7684\u65f6\u5019\uff0c\u4e0d\u4f1a\u50cf\u7cfb\u7edf\u7533\u8bf7\u5185\u5b58\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">list<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u94fe\u8868\u88ab\u5e7f\u6cdb\u7528\u4e8e\u5b9e\u73b0 Redis \u7684\u5404\u79cd\u529f\u80fd\uff0c\u6bd4\u5982\u5217\u8868\u952e\u3001\u53d1\u5e03\u4e0e\u8ba2\u9605\u3001\u6162\u67e5\u8be2\u3001\u76d1\u89c6\u5668\u7b49\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct listNode {\n    struct listNode * prev; \/\/\u524d\u7f6e\u8282\u70b9\n    struct listNode * next; \/\/\u540e\u7f6e\u8282\u70b9\n    void * value;\/\/\u8282\u70b9\u7684\u503c\n};<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">hash<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u4ec5\u4ec5\u662f\u6570\u636e\u7c7b\u578b\u4e3ahash\u7684\u624d\u7528\u5230hash\u7ed3\u6784\uff0credis\u672c\u8eab\u6240\u6709\u7684k\u3001v\u5c31\u662f\u4e00\u4e2a\u5927hash\u3002\u4f8b\u5982\u6211\u4eec\u7ecf\u5e38\u7528\u7684set key value\uff0c<code>key<\/code>\u5c31\u662fhash\u7684\u952e\uff0c<code>value<\/code>\u5c31\u662fhash\u7684\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct dict {\n    ...\n    dictht ht[2]; \/\/\u54c8\u5e0c\u8868\n    rehashidx == -1 \/\/rehash\u4f7f\u7528\uff0c\u6ca1\u6709rehash\u7684\u65f6\u5019\u4e3a-1\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300crehash\u300d<\/strong>\uff1a\u6bcf\u4e2a\u5b57\u5178\u6709\u4e24\u4e2ahash\u8868\uff0c\u4e00\u4e2a\u5e73\u65f6\u4f7f\u7528\uff0c\u4e00\u4e2arehash\u7684\u65f6\u5019\u4f7f\u7528\u3002rehash\u662f\u6e10\u8fdb\u5f0f\u7684\uff0c\u5206\u522b\u662f\u7531\u4ee5\u4e0b\u89e6\u53d1\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>serveCron\u5b9a\u65f6\u68c0\u6d4b\u8fc1\u79fb\u3002<\/li><li>\u6bcf\u6b21kv\u53d8\u66f4\u7684\u65f6\u5019\uff08\u65b0\u589e\u3001\u66f4\u65b0\uff09\u7684\u65f6\u5019\u987a\u5e26rehash\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300chash\u51b2\u7a81\u300d<\/strong>\uff1a\u91c7\u7528\u5355\u5411\u94fe\u8868\u7684\u65b9\u5f0f\u89e3\u51b3hash\u51b2\u7a81\uff0c\u65b0\u7684\u51b2\u7a81\u5143\u7d20\u4f1a\u88ab\u653e\u5230\u94fe\u8868\u7684\u8868\u5934\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">zset<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u5e8f\u96c6\u5408\u53ef\u4ee5\u88ab\u7528\u4e8e\u4e00\u4e9b\u6392\u5e8f\u573a\u666f\uff0c\u5e95\u5c42\u91c7\u7528\u8df3\u8dc3\u8868\u5b9e\u73b0\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct zskiplistNode {\n    struct zskiplistLevel {\n        struct zskiplistNode *forward;\/\/\u524d\u8fdb\u6307\u9488\n        unsigned int span;\/\/\u8de8\u5ea6\n    } level[];\n    struct zskiplistNode *backward;\/\/\u540e\u9000\u6307\u9488\n    double score;\/\/\u5206\u503c\n    robj *obj; \/\/ \u6210\u5458\u5bf9\u8c61\n};<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u5c42\u9ad8\u300d<\/strong>\uff1a\u6bcf\u4e2a\u8df3\u8dc3\u8868\u8282\u70b9\u7684\u5c42\u9ad8\u57281-32\u4e4b\u95f4\u3002<br>\n<strong>\u300c\u8df3\u8dc3\u300d<\/strong>\uff1a\u901a\u8fc7\u5c42\u6765\u5b9e\u73b0\u8de8\u8282\u70b9\u8df3\u8dc3\uff0c\u8fbe\u5230\u52a0\u901f\u8bbf\u95ee\u7684\u6548\u679c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis0.png\" alt=\"zset\u6709\u5e8f\u96c6\u5408\u5e95\u5c42\" \/><figcaption>zset\u6709\u5e8f\u96c6\u5408\u5e95\u5c42<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982 o1 \u5230 o3 \u53ea\u9700\u8981\u901a\u8fc7 L4 \u5c42\u8de8\u5ea6\u4e3a 2 \u5b9e\u73b0\u8de8\u8282\u70b9\u8df3\u8dc3\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">set<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">set \u7684\u5e95\u5c42\u4e3a\u4e86\u5b9e\u73b0\u5185\u5b58\u7684\u8282\u7ea6\uff0c\u4f1a\u6839\u636e\u96c6\u5408\u7684\u7c7b\u578b\u548c\u6570\u76ee\u800c\u91c7\u7528\u4e0d\u540c\u7684\u6570\u636e\u7ed3\u6784\u6765\u4fdd\u5b58\uff0c\u5f53\u96c6\u5408\u7684\u5143\u7d20\u90fd\u662f\u6574\u578b\u4e14\u6570\u91cf\u4e0d\u591a\u65f6\u4f1a\u91c7\u7528\u6574\u6570\u96c6\u5408\u6765\u5b58\u50a8\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct intset {\n    uint32_t encoding;\/\/\u7f16\u7801\u65b9\u5f0f\n    uint32_t length;\/\/\u96c6\u5408\u5305\u542b\u7684\u5143\u7d20\u6570\u91cf\n    int8_t contents[];\/\/\u4fdd\u5b58\u5143\u7d20\u7684\u6570\u7ec4\n};<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6574\u6570\u96c6\u5408\u5e95\u5c42\u5b9e\u73b0\u4e3a\u6570\u7ec4\uff0c\u5728\u6dfb\u52a0\u5143\u7d20\u7684\u65f6\u5019\uff0c\u6839\u636e\u9700\u8981\u4f1a\u4fee\u6539\u8fd9\u4e2a\u6570\u7ec4\u7684\u7c7b\u578b\uff08\u6bd4\u5982 int16 \u5347\u7ea7\u6210 int32\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u4e3a\u4ec0\u4e48\u90a3\u4e48\u5feb<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5927\u578b\u5e94\u7528\u67b6\u6784\u4e2d\uff0credis \u4f5c\u4e3a\u7f13\u5b58\u5c42\u5df2\u7ecf\u662f\u975e\u5e38\u666e\u904d\u7684\u73b0\u8c61\uff0c\u5176\u4e2d\u4e00\u4e2a\u539f\u56e0\u5c31\u662f\u5b83\u975e\u5e38\u5feb\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5185\u5b58\u578b\u6570\u636e\u5e93<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">redis \u662f\u5185\u5b58\u578b\u6570\u636e\u5e93\uff0c\u5927\u591a\u6570\u64cd\u4f5c\u90fd\u662f\u57fa\u4e8e\u5185\u5b58\u7684\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7279\u6b8a\u7684\u6570\u636e\u7ed3\u6784<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u77e5\u9053 redis \u7684\u6570\u636e\u7ed3\u6784\u662f\u6709\u7279\u6b8a\u8bbe\u8ba1\u7684\uff0c\u6bd4\u5982 string \u7c7b\u578b\u91c7\u7528 sds \u6570\u636e\u7ed3\u6784\u6765\u5b58\u50a8\uff0c\u6bcf\u6b21 string \u7684\u7a7a\u95f4\u4e0d\u591f\u65f6\uff0c\u603b\u662f\u5c1d\u8bd5\u53bb\u7533\u8bf7\u66f4\u591a\u7684\u5185\u5b58\uff0c\u6bcf\u6b21 string \u7a7a\u95f4\u591a\u4f59\u7684\u65f6\u5019\uff0c\u4e5f\u4e0d\u662f\u628a\u591a\u4f59\u7684\u7a7a\u95f4\u8fd8\u7ed9\u7cfb\u7edf\uff0c\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u6765\u51cf\u5c11\u5185\u5b58\u7684\u7533\u8bf7\u8fbe\u5230\u4e00\u79cd\u5feb\uff0c\u6709\u5e8f\u96c6\u5408\u91c7\u7528\u7684\u8df3\u8dc3\u8868\u53ef\u4ee5\u901a\u8fc7\u4e0d\u540c\u7684\u5c42\u6765\u8fbe\u5230\u52a0\u901f\u8bbf\u95ee\u8282\u70b9\u7684\u6548\u679c\u4e5f\u662f\u5feb\u901f\u7684\u4f53\u73b0\uff0c\u6e10\u8fdb\u5f0f rehash \u4e5f\u662f\u9ad8\u6548\u5feb\u901f\u7684\u4f53\u73b0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5355\u7ebf\u7a0b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">redis \u7684\u4e3b\u4f53\u6a21\u5f0f\u8fd8\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u9664\u4e86\u4e00\u4e9b\u6301\u4e45\u5316\u76f8\u5173\u7684 fork\u3002\u5355\u7ebf\u7a0b\u76f8\u6bd4\u591a\u7ebf\u7a0b\u7684\u597d\u5904\u5c31\u662f\u9501\u7684\u95ee\u9898\uff0c\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u95ee\u9898\u3002\u5b98\u65b9\u4e5f\u89e3\u91ca\u5230\uff1aredis \u7684\u6027\u80fd\u4e0d\u5728 cpu\uff0c\u800c\u5728\u5185\u5b58\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IO\u591a\u8def\u590d\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IO \u591a\u8def\u590d\u7528\u5c31\u662f\u591a\u4e2a TCP \u8fde\u63a5\u590d\u7528\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5982\u679c\u91c7\u7528\u591a\u4e2a\u8bf7\u6c42\u8d77\u591a\u4e2a\u8fdb\u7a0b\u6216\u8005\u591a\u4e2a\u4e2a\u7ebf\u7a0b\u7684\u6a21\u5f0f\u8fd8\u662f\u6bd4\u8f83\u91cd\u7684\uff0c\u9664\u4e86\u8981\u8003\u8651\u5230\u8fdb\u7a0b\u6216\u8005\u7ebf\u7a0b\u7684\u5207\u6362\u4e4b\u5916\uff0c\u8fd8\u8981\u7528\u6237\u6001\u53bb\u904d\u5386\u68c0\u67e5\u4e8b\u4ef6\u662f\u5426\u5230\u8fbe\uff0c\u6548\u7387\u4f4e\u4e0b\u3002redis \u652f\u6301<strong>\u300cselect\u300d<\/strong>\u3001<strong>\u300cpoll\u300d<\/strong>\u3001<strong>\u300cepoll\u300d<\/strong>\u6a21\u5f0f\u7684\u591a\u8def\u590d\u7528\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4f1a\u9009\u62e9\u7cfb\u7edf\u652f\u6301\u7684\u6700\u597d\u7684\u6a21\u5f0f\u3002\u901a\u8fc7 IO \u591a\u8def\u590d\u7528\u6280\u672f\uff0c\u7528\u6237\u6001\u4e0d\u7528\u53bb\u904d\u5386fds\u96c6\u5408\uff0c\u901a\u8fc7\u5185\u6838\u901a\u77e5\u544a\u8bc9\u4e8b\u4ef6\u7684\u5230\u8fbe\uff0c\u6548\u7387\u6bd4\u8f83\u9ad8\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">pipeline\u7684\u597d\u5904\u662f\u4ec0\u4e48<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5ba2\u6237\u7aef\u6267\u884c\u4e00\u6761\u547d\u4ee4\u7684\u8fc7\u7a0b\u5927\u6982\u662f\u8fd9\u6837\uff1a<br>\n<strong>\u300c\u547d\u4ee4\u8bf7\u6c42-&gt;\u547d\u4ee4\u6392\u961f-&gt;\u547d\u4ee4\u6267\u884c-&gt;\u7ed3\u679c\u8fd4\u56de\u3002\u300d<\/strong> \u8fd9\u4e2a\u8fc7\u7a0b\u6211\u4eec\u53eb\u505aRTT\uff08Round trip time\uff09\u5f80\u8fd4\u65f6\u95f4\u3002\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9047\u5230\u8fd9\u6837\u4e00\u79cd\u573a\u666f\uff1a\u6211\u4eec\u9700\u8981\u4e0d\u505c\u7684 incr \u4e00\u4e2a key\uff0c\u4f46\u662f\u8fd9\u4e2a key \u4e0d\u80fd\u6c38\u4e45\u5b58\u5728\uff0c\u5f97\u52a0\u4e00\u4e2a\u8fc7\u671f\u65f6\u95f4\uff0c\u4e8e\u662f\u6211\u4eec\u7684\u7a0b\u5e8f\u5927\u6982\u957f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>incr key #\u4e00\u6b21RTT\nexpire key time #\u4e00\u6b21RTT\n#\u603b\u5171\u4e24\u6b21RTT<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u6211\u4eec\u53d1\u73b0\u6574\u4e2a\u8fc7\u7a0b\u9700\u8981\u4e24\u4e2a RTT\u3002\u4e00\u822c\u6211\u4eec\u751f\u4ea7\u73af\u5883\u90fd\u662f\u7528\u7684\u8fde\u63a5\u6c60\uff0c\u5728\u8fde\u63a5\u6c60\u6709\u8db3\u591f\u7684\u8fde\u63a5\u7684\u65f6\u5019\uff0c\u53ef\u80fd\u6211\u8fd8\u4e0d\u9700\u8981\u53bb\u521b\u5efa\u65b0\u7684\u8fde\u63a5\uff0c\u8fd9\u6837\u5c31\u7701\u4e86 TCP \u4e09\u6b21\u63e1\u624b\u7684\u5f00\u9500\uff0c\u5f53\u9700\u8981\u521b\u5efa\u65b0\u7684\u8fde\u63a5\u7684\u65f6\u5019\uff0c\u8fd9\u65f6\u5019\u8fd8\u8981\u53bb\u5efa\u7acb\u8fde\u63a5\uff0c\u6574\u4e2a\u5f00\u9500\u53c8\u4e0a\u53bb\u4e86\u3002\u9488\u5bf9\u8fd9\u79cd\u6279\u5904\u7406\u547d\u4ee4\uff0c\u4e3a\u4e86\u51cf\u5c11\u5f80\u8fd4\u7684\u5f00\u9500\uff0c\u4e8e\u662f\u7ba1\u9053<code>pipeline<\/code>\u8bde\u751f\u4e86\uff0c\u901a\u8fc7\u7ba1\u9053\u6211\u4eec\u53ef\u4ee5\u628a\u4e24\u6761\u547d\u4ee4\u5408\u5e76\u53d1\u9001\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u4f2a\u4ee3\u7801\npipeline-&gt;send(incr key)\npipeline-&gt;send(expire key time)\npipeline-&gt;execute() #\u4e00\u6b21RTT\n#\u603b\u5171\u4e00\u6b21RTT<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u5c31\u53ef\u4ee5\u5c06 2 \u6b21\u7684 RTT \u51cf\u5c11\u6210 1 \u6b21 RTT\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis1.png\" alt=\"\u7ba1\u9053pipeline\" \/><figcaption>\u7ba1\u9053pipeline<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u8282\u7ea6\u8d44\u6e90\u300d<\/strong>\uff1apipeline \u53ef\u4ee5\u5c06\u591a\u6b21\u7684\u8bf7\u6c42\u5408\u5e76\u6210\u4e00\u6b21\u8bf7\u6c42\uff0c\u51cf\u5c11\u7f51\u7edc\u5f00\u9500\uff0c\u8282\u7ea6\u65f6\u95f4\u3002\u4f46\u662f\u901a\u8fc7 pipeline \u5408\u5e76\u7684\u8bf7\u6c42\u4e0d\u80fd\u592a\u591a\uff0c\u592a\u591a\u7684\u8bdd\uff0c\u53ef\u80fd\u5360\u4e86\u5927\u91cf\u7684\u5e26\u5bbd\uff0c\u9020\u6210\u7f51\u7edc\u62e5\u5835\uff0c\u540c\u65f6\u592a\u591a\u7684\u547d\u4ee4\u4f1a\u9020\u6210\u5ba2\u6237\u7aef\u7b49\u5f85\u65f6\u95f4\u8f83\u957f\uff0c\u63a8\u8350\u5c06\u5927\u6279\u91cf\u7684\u547d\u4ee4\u62c6\u6210\u591a\u4e2a\u5c0f\u6279\u7684 pipeline\u3002<br>\n<strong>\u300c\u975e\u539f\u5b50\u6027\u300d<\/strong>\uff1apipeline \u5e76\u975e\u662f\u539f\u5b50\u6027\u7684\uff0c\u5047\u8bbe\u4f60\u901a\u8fc7 pipeline \u53d1\u4e86<code>incr key<\/code>\u3001<code>expire key<\/code>\u4e24\u6761\u6307\u4ee4\u3002\u4f46\u662f redis \u6267\u884c expire \u7684\u65f6\u5019\u5931\u8d25\u4e86\uff0c\u8fd9\u6837\u76f8\u5f53\u4e8e\u4f60\u7684 key \u6ca1\u6709\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u8fd9\u4e00\u70b9\u662f\u9700\u8981\u6ce8\u610f\u7684\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u534f\u8bae\u662f\u4ec0\u4e48\u6837\u7684<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">redis \u81ea\u5df1\u8bbe\u8ba1\u4e86\u4e00\u5957\u5e8f\u5217\u5316\u534f\u8bae RESP\uff0c\u4e3b\u8981\u6709\u5bb9\u6613\u5b9e\u73b0\u3001\u89e3\u6790\u5feb\u3001\u53ef\u8bfb\u6027\u597d\u51e0\u4e2a\u7279\u70b9\u3002\u534f\u8bae\u7684\u6bcf\u90e8\u5206\u90fd\u662f<code>\\r\\n<\/code>\u7ed3\u675f\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7\u7279\u6b8a\u7b26\u53f7\u6765\u533a\u5206\u51fa\u6570\u636e\u7684\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5355\u884c\u56de\u590d\uff1a\u4ee5<code>+<\/code>\u53f7\u5f00\u5934\u3002<\/li><li>\u9519\u8bef\u56de\u590d\uff1a\u4ee5<code>-<\/code>\u53f7\u5f00\u5934\u3002<\/li><li>\u6574\u6570\u56de\u590d\uff1a\u4ee5<code>:<\/code>\u53f7\u5f00\u5934\u3002<\/li><li>\u6279\u91cf\u56de\u590d\uff1a\u4ee5<code>$<\/code>\u53f7\u5f00\u5934\u3002<\/li><li>\u591a\u6761\u6279\u91cf\u56de\u590d\uff1a\u4ee5<code>*<\/code>\u53f7\u5f00\u5934\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u901a\u8fc7 redis \u5ba2\u6237\u7aef\u770b\u4e0d\u51fa\u6765\u6548\u679c\uff0c\u6211\u8fd9\u91cc\u7528 nc \u8fd9\u4e2a tcp \u5de5\u5177\u6765\u6a21\u62df\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nc 127.0.0.1 6379 #\u8fde\u63a5\u4e0aredis\n#\u53d1\u8d77ping\nping \n+PONG\n\n#\u53d1\u9001\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u547d\u4ee4\nhi\n-ERR unknown command 'hi'\n\n#age+1\nincr age\n:1\n\n#get\n$2\ngo\n\n#mget\nmget name1 name2\n*2\n$2\ngo\n$4\njava<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u6bcf\u884c\u90fd\u662f<code>\\r\\n<\/code>\u7ed3\u675f\u7684\uff0cRedis \u534f\u8bae\u7684\u5b9e\u73b0\u6027\u80fd\u53ef\u4ee5\u548c\u4e8c\u8fdb\u5236\u534f\u8bae\u7684\u5b9e\u73b0\u6027\u80fd\u76f8\u5ab2\u7f8e\uff0c \u5e76\u4e14\u7531\u4e8e Redis \u534f\u8bae\u7684\u7b80\u5355\u6027\uff0c\u5927\u90e8\u5206\u8bed\u8a00\u90fd\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e2a\u534f\u8bae\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u662f\u5982\u4f55\u4fdd\u8bc1\u539f\u5b50\u6027\u7684<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ec0\u4e48\u539f\u5b50\u6027\uff1f\u7a0b\u5e8f\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u8981\u4e48\u5168\u90e8\u90fd\u6267\u884c\uff0c\u8981\u4e48\u5168\u90e8\u90fd\u4e0d\u6267\u884c\uff0c\u4e0d\u53ef\u80fd\u6267\u884c\u4e86\u4e00\u534a\uff0c\u6ede\u7559\u4e86\u4e00\u534a\u3002\u6211\u4eec\u77e5\u9053 redis \u662f IO \u591a\u8def\u590d\u7528\u6a21\u578b\uff0c\u5373\u4e00\u4e2a\u7ebf\u7a0b\u6765\u5904\u7406\u591a\u4e2a TCP \u8fde\u63a5\uff0c\u8fd9\u6837\u7684\u597d\u5904\u5c31\u662f\uff0c\u5373\u4f7f\u5ba2\u6237\u7aef\u5e76\u53d1\u8bf7\u6c42\uff0c\u4e5f\u5f97\u6392\u961f\u5904\u7406\uff0c\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u4e86\u591a\u7ebf\u7a0b\u6a21\u578b\u5e26\u7684\u5e76\u53d1\u95ee\u9898\uff0c\u4f46\u662f\u5355\u7ebf\u7a0b\u6a21\u578b\u5e76\u4e0d\u80fd\u89e3\u51b3\u539f\u5b50\u6027\u95ee\u9898\u3002<br>\n\u8fd8\u662f\u4ee5 incr \u548c expire \u4e3a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u547d\u4ee41\uff1aincr key\n\u547d\u4ee42\uff1aexpire key time<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u7ba1\u4f60\u662f pipeline \u8fd8\u662f\u975e pipeline\uff0c\u8fd9\u6837\u4e24\u6761\u64cd\u4f5c\u4f60\u90fd\u662f\u65e0\u6cd5\u4fdd\u6301\u539f\u5b50\u6027\u7684\uff0c\u547d\u4ee4 1 \u7684\u5931\u8d25\u4e0d\u5f71\u54cd\u547d\u4ee4 2 \u7684\u6267\u884c\uff0c\u547d\u4ee42\u7684\u6267\u884c\u4e5f\u4e0d\u5f71\u54cd\u547d\u4ee4 1 \u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u652f\u6301\u539f\u5b50\u64cd\u4f5c\u7684\u547d\u4ee4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u73b0\u5728\u6709\u4e24\u4e2a\u5ba2\u6237\u7aef\u5e0c\u671b\u4fee\u6539\u67d0\u4e2a\u503c\uff0c\u5b83\u4eec\u64cd\u4f5c\u7684\u6d41\u7a0b\u662f\u5148\u83b7\u53d6\u539f\u5148\u7684\u503c\uff0c\u518d\u66f4\u65b0<strong>\u300c\u65b0\u503c=\u8001\u503c+1\u300d<\/strong> \u4f46\u662f\u7531\u4e8e\u65f6\u95f4\u987a\u5e8f\u7684\u95ee\u9898\uff0c\u53ef\u80fd\u5b83\u4eec\u662f\u8fd9\u6837\u6267\u884c\u7684\u987a\u5e8f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># key\u7684value\u521a\u5f00\u59cb\u662f10\n\u5ba2\u6237\u7aef1\uff1aget key #10\n\u5ba2\u6237\u7aef2\uff1aget key #10\n\u5ba2\u6237\u7aef1\uff1aset key 11 #11\n\u5ba2\u6237\u7aef2\uff1aset key 11 #11<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f1a\u53d1\u73b0\u5ba2\u6237\u7aef 2 \u66f4\u65b0\u7684\u503c\u4e22\u5931\u4e86\uff0c\u539f\u56e0\u5728\u4e8e\u5ba2\u6237\u7aef 1 \u5728\u83b7\u53d6\u5230 key \u7684\u503c\u4e4b\u540e\uff0c\u6ca1\u6765\u7684\u53ca\u66f4\u65b0\uff0c\u8fd9\u65f6\u5ba2\u6237\u7aef 2 \u7684 get \u8fdb\u6765\u4e86\uff0c\u5bfc\u81f4\u5ba2\u6237\u7aef 2 \u83b7\u53d6\u7684\u662f\u8001\u503c\u3002<br>\n\u5bf9\u4e8e\u8fd9\u79cd\u573a\u666f\uff0c\u53ef\u4ee5\u7528 redis \u7684<strong>\u300cincr\u300d<\/strong>\u6765\u66ff\u4ee3\uff0cincr \u662f\u539f\u5b50\u7684\u64cd\u4f5c\u7684\uff0c\u5b83\u628aget \u548c set \u5408\u5e76\u5728\u4e00\u8d77\uff0c\u518d\u5229\u7528 redis \u7684\u5355\u7ebf\u7a0b\u7279\u6027\uff0c\u7b2c\u4e00\u4e2a incr \u8fdb\u6765\u7684\u65f6\u5019\uff0c\u7b2c\u4e8c\u4e2a incr \u4e00\u5b9a\u662f\u7b49\u5f85\u7684\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u5b58\u5728\u66f4\u65b0\u4e22\u5931\u7684\u95ee\u9898\u3002\u7c7b\u578b\u7684\u539f\u5b50\u547d\u4ee4\u8fd8\u6709<strong>\u300cdecr\u300d<\/strong> \u3001<strong>\u300csetnx\u300d<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e8b\u52a1+\u76d1\u63a7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u5408 watch \u76d1\u63a7\u548c\u4e8b\u52a1\u4e5f\u53ef\u4ee5\u89e3\u51b3\uff0c\u6bcf\u4e2a\u5ba2\u6237\u7aef\u53ef\u4ee5\u901a\u8fc7 watch \u6765\u76d1\u63a7\u81ea\u5df1\u5373\u5c06\u8981\u66f4\u65b0\u7684 key\uff0c\u8fd9\u6837\u5728\u4e8b\u52a1\u66f4\u65b0\u7684\u65f6\u5019\uff0c\u5982\u679c\u53d1\u73b0\u81ea\u5df1\u76d1\u63a7\u7684 key \u88ab\u4fee\u6539\u4e86\uff0c\u90a3\u4e48\u62d2\u7edd\u6267\u884c\uff0c\u4e8b\u52a1\u6267\u884c\u5931\u8d25\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u5b58\u5728\u66f4\u65b0\u8986\u76d6\u7684\u95ee\u9898\u3002watch \u7684\u672c\u8d28\u8fd8\u662f\u4e50\u89c2\u9501\uff0c\u5f53\u5ba2\u6237\u7aef\u6267\u884c watch \u7684\u65f6\u5019\uff0c\u5b9e\u9645\u4e0a\u662f watch \u7684 key \u4f1a\u7ef4\u62a4\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u961f\u5217\uff0c\u8fd9\u6837\u5c31\u77e5\u9053\u8fd9\u4e2a key \u88ab\u54ea\u4e9b\u5ba2\u6237\u7aef\u76d1\u89c6\u4e86\u3002\u5f53\u5176\u4e2d\u7684\u4e00\u4e2a\u5ba2\u6237\u7aef\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u90a3\u4e48\u5b83\u4f1a\u4ece\u8fd9\u4e2a\u961f\u5217\u4e2d\u79fb\u9664\uff0c\u5e76\u4e14\u4f1a\u628a\u8fd9\u4e2a\u5217\u8868\u4e2d\u5269\u4f59\u7684\u6240\u6709\u5ba2\u6237\u7aef\u7684<code>CLIENT_DIRTY_CAS<\/code>\u6807\u8bc6\u6253\u5f00\uff0c\u8fd9\u6837\u5269\u4f59\u7684\u5ba2\u6237\u7aef\u5728\u6267\u884c exec \u7684\u65f6\u5019\uff0c\u53d1\u73b0\u81ea\u5df1\u7684<code>CLIENT_DIRTY_CAS<\/code>\u5df2\u7ecf\u88ab\u6253\u5f00\uff0c\u90a3\u4e48\u5c31\u4f1a\u62d2\u7edd\u6267\u884c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5ba2\u6237\u7aef1 &gt; watch key\nOK\n\u5ba2\u6237\u7aef1 &gt; MULTI\nOK\n\u5ba2\u6237\u7aef1 &gt; SET key 100\nQUEUED\n\u5ba2\u6237\u7aef1 &gt; EXEC\n1) OK\n\u5ba2\u6237\u7aef1 &gt; GET key\n\"100\"<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5ba2\u6237\u7aef2 &gt; watch key\nOK\n\u5ba2\u6237\u7aef2 &gt; MULTI\nOK\n\u5ba2\u6237\u7aef2 &gt; SET key 101\nQUEUED\n\u5ba2\u6237\u7aef2 &gt; EXEC\n(nil)\n\u5ba2\u6237\u7aef2 &gt; GET key\n\"100\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5ba2\u6237\u7aef 1 \u548c\u5ba2\u6237\u7aef 2 \u90fd\u5c1d\u8bd5\u6765\u4fee\u6539 key \u7684\u503c\uff0c\u7136\u800c\u56e0\u4e3a\u5ba2\u6237\u7aef 1 \u5148\u66f4\u65b0\u4e86\u3002\u90a3\u4e48\u5ba2\u6237\u7aef 2 \u5728\u66f4\u65b0\u7684\u65f6\u5019\u901a\u8fc7 watch \u53d1\u73b0\u503c\u5df2\u7ecf\u88ab\u4fee\u6539\u4e86\uff0c\u5c31\u4f1a\u62d2\u7edd\u6267\u884c\uff0c\u8fd4\u56de\u4e2a<strong>\u300cnil\u300d<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">lua\u811a\u672c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">redis \u5728 2.6 \u4e4b\u540e\u5f00\u59cb\u652f\u6301\u5f00\u53d1\u8005\u7f16\u5199 lua \u811a\u672c\u4f20\u5230 redis \u4e2d\uff0c\u4f7f\u7528 lua \u811a\u672c\u7684\u597d\u5904\u662f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u51cf\u5c11\u7f51\u7edc\u5f00\u9500\uff0c\u901a\u8fc7 lua \u811a\u672c\u53ef\u4ee5\u4e00\u6b21\u6027\u7684\u5c06\u591a\u4e2a\u8bf7\u6c42\u5408\u5e76\u6210\u4e00\u4e2a\u8bf7\u6c42\u3002<\/li><li>\u539f\u5b50\u64cd\u4f5c\uff0credis \u5c06 lua \u811a\u672c\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\uff0c\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u4e0d\u4f1a\u88ab\u5176\u4ed6\u547d\u4ee4\u6253\u65ad\uff0c\u4e0d\u4f1a\u51fa\u73b0\u7ade\u6001\u95ee\u9898\u3002<\/li><li>\u590d\u7528\uff0c\u5ba2\u6237\u7aef\u53d1\u9001\u7684 lua \u811a\u672c\u4f1a\u6c38\u8fdc\u5b58\u5728 redis \u670d\u52a1\u4e2d\u3002<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u6765\u770b\u770b lua \u662f\u5982\u4f55\u4fdd\u8bc1\u539f\u5b50\u6027\u7684\uff0c\u5047\u8bbe\u73b0\u5728\u6709\u4e2a\u903b\u8f91\uff0c\u6211\u4eec\u8981\u5148\u5224\u65ad key \u4e0d\u5b58\u5728\uff0c\u518d\u8bbe\u7f6e key\uff0c\u5b58\u5728\u7684\u8bdd\uff0c\u5c31\u4e0d\u8bbe\u7f6e\u4e86\u3002<br>\n<strong>\u300c\u4e0d\u7528lua\u300d<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#\u4f2a\u4ee3\u7801\n\u5ba2\u6237\u7aef1\uff1aif key not exist\n\u5ba2\u6237\u7aef2\uff1aif key not exist\n\u5ba2\u6237\u7aef1\uff1aset key 10086\n\u5ba2\u6237\u7aef2\uff1aset key 10086 #\u591a\u4f59\u7684<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u4e0a\u8ff0\u4e0d\u5177\u5907\u539f\u5b50\u6027\uff0c\u5bfc\u81f4\u5ba2\u6237\u7aef 2 \u591a\u6267\u884c\u4e86\u4e00\u6b21\u3002<br>\n<strong>\u300c\u4f7f\u7528lua\u300d<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>127.0.0.1:6379&gt; eval \"if redis.call('get', KEYS[1]) == false then redis.call('set', KEYS[1], ARGV[1]) return 0 else return 1 end\" 1 key \"10086\"\n(integer) 0 #\u6267\u884c\u6210\u529f\n127.0.0.1:6379&gt; get key1\n\"10086\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u4e86 lua \u4e4b\u540e\uff0c\u9996\u5148 redis \u672c\u8eab\u4f1a\u628a\u6574\u4e2a lua \u811a\u672c\u5f53\u6210\u4e00\u4e2a\u6574\u4f53\uff0c\u8fd0\u884c\u671f\u95f4\u4e0d\u4f1a\u6536\u5230\u5176\u4ed6\u547d\u4ee4\u7684\u5e72\u6270\u3002\u4f7f\u7528 lua \u811a\u672c\u4e4b\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u81ea\u5df1\u7684\u590d\u6742\u4e1a\u52a1\u6765\u4fdd\u8bc1\u539f\u5b50\u6027\u3002\u5f53 lua \u811a\u672c\u5f88\u957f\u65f6\uff0c\u5728\u547d\u4ee4\u884c\u91cc\u6267\u884c\u4e0d\u592a\u4f18\u96c5\uff0credis \u63d0\u4f9b load lua \u7684\u547d\u4ee4\uff0c\u5bfc\u5165 lua \u811a\u672c\u6587\u4ef6\uff0c\u5bfc\u5165\u6210\u529f\u540e\u4f1a\u8fd4\u56de\u4e00\u4e2a sha1 \u7f16\u7801\u7684 id\uff0c\u540e\u671f\u901a\u8fc7\u8fd9\u4e2a id \u53ef\u4ee5\u53cd\u590d\u6267\u884c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u751f\u4ea7\u73af\u5883\u5927key\u5982\u4f55\u5220\u9664<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u751f\u4ea7\u73af\u5883\u53bb\u5220\u9664\u4e00\u4e2a\u5927 key \u7684\u65f6\u5019\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u7ebf\u4e0a\u963b\u585e\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u5371\u9669\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u9009\u62e9\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u6839\u636e\u4e1a\u52a1\u573a\u666f\u5224\u65ad\uff0c\u4f4e\u5cf0\u671f\u53bb\u5220\u9664\u53ef\u4ee5\u6709\u6548\u964d\u4f4e\u635f\u5931\u3002<\/li><li>\u5bf9\u4e8e hset \u53ef\u4ee5\u901a\u8fc7 scan \u5206\u6279\u83b7\u53d6\u5220\u9664\uff0c\u5bf9\u4e8e set \u548c zset \u53ef\u4ee5\u6bcf\u6b21\u53d6\u4e00\u6279\u6570\u636e\u5220\u9664\uff0c\u5bf9\u4e8e list \u76f4\u63a5 pop \u5220\u9664\u3002<\/li><li>redis4.0 \u652f\u6301 unlink \u5f02\u6b65\u5220\u9664\uff0c\u4e0d\u963b\u585e\u4e3b\u7ebf\u7a0b\u3002<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\u5982\u4f55\u89e3\u51b3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ad8\u6027\u80fd\u67b6\u6784\u4e2d\uff0c\u6211\u4eec\u4e00\u822c\u4f1a\u5728 db \u5c42\u4e4b\u4e0a\u52a0\u4e2a cache \u5c42\uff0c\u56e0\u4e3a cache \u7684\u6570\u636e\u662f\u5728\u5185\u5b58\u4e2d\u7684\uff0c\u8fd9\u6837\u5f53\u5927\u91cf\u6570\u636e\u8bbf\u95ee\u7684\u65f6\u5019\uff0c\u5982\u679c cache \u7684\u547d\u4e2d\u7387\u9ad8\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u963b\u6321\u5927\u91cf\u7684\u8bf7\u6c42\u6253\u5230\u6211\u4eec\u7684db\u4e2d\u53bb\uff0c\u8d77\u5230\u4fdd\u62a4 db \u548c\u52a0\u901f\u8bbf\u95ee\u7684\u4f5c\u7528\u3002\u5982\u679c cache miss \u4e86\uff0c\u90a3\u4e48\u5f53\u6570\u636e\u5e93\u4e2d\u8bfb\u5230\u6570\u636e\u7684\u65f6\u5019\uff0c\u6211\u4eec\u4e5f\u4f1a\u5199\u5165\u4e00\u4efd\u5230\u7f13\u5b58\u4e2d\u53bb\uff0c\u8fd9\u6837\u4e0b\u6b21\u8bf7\u6c42\u7684\u65f6\u5019\u4e5f\u4f1a\u4ece\u7f13\u5b58\u83b7\u5f97\u6570\u636e\u3002\u5982\u679c\u67d0\u4e2a cache \u4e00\u76f4 miss\uff0c\u6216\u8005\u67d0\u4e2a cache miss \u4e4b\u540e\u7a81\u7136\u5e76\u53d1\u8fdb\u6765\u5927\u91cf\u8bf7\u6c42\u4ee5\u53ca\u7f13\u5b58\u5728\u67d0\u4e00\u77ac\u95f4\u5927\u9762\u79ef\u5931\u6548\u548b\u529e\uff1f<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis2.png\" alt=\"\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\u5982\u4f55\u89e3\u51b3\" \/><figcaption>\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\u5982\u4f55\u89e3\u51b3<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f13\u5b58\u7a7f\u900f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u6211\u4eec\u8bbf\u95ee\u4e00\u4e2a\u975e\u6cd5\u7684\u6570\u636e\u7684\u65f6\u5019\uff08\u7f13\u5b58\u548c\u6570\u636e\u5e93\u90fd\u4e0d\u5b58\u5728\u7684\u6570\u636e\uff09\uff0c\u6bcf\u6b21\u5148\u53bb\u7f13\u5b58\u83b7\u53d6\uff0c\u83b7\u53d6\u4e0d\u5230\uff0c\u7136\u540e\u53bb\u6570\u636e\u5e93\u83b7\u53d6\uff0c\u4f9d\u7136\u83b7\u53d6\u4e0d\u5230\uff0c\u6bd4\u5982<code>user_id=-1<\/code>\u8fd9\u79cd\uff08\u4e00\u4e2a\u7528\u6237\u7684 id \u662f\u4e0d\u53ef\u80fd\u4e3a\u8d1f\u6570\u7684\uff09\u3002\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff0c\u6bcf\u6b21\u5fc5\u7136\u662f\u8981\u53bb\u6570\u636e\u5e93\u8bf7\u6c42\u4e00\u6b21\u4e0d\u5b58\u5728\u7684\u6570\u636e\uff0c\u8fd9\u65f6\u5019\u56e0\u4e3a\u6ca1\u6709\u6570\u636e\uff0c\u6240\u4ee5\u4e5f\u4e0d\u4f1a\u5199\u5165\u7f13\u5b58\uff0c\u4e0b\u4e00\u6b21\u540c\u6837\u7684\u8bf7\u6c42\u8fd8\u662f\u4f1a\u91cd\u8e48\u8986\u8f99\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis3.png\" alt=\"\u7f13\u5b58\u7a7f\u900f\" \/><figcaption>\u7f13\u5b58\u7a7f\u900f<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u89e3\u51b3\u300d<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u524d\u7aef\u6821\u9a8c\uff1a\u67d0\u4e9b\u60c5\u51b5\uff0c\u6bd4\u5982\u7528\u6237\u5728\u81ea\u5df1\u7684\u4e2a\u4eba\u4e2d\u5fc3\u9875\u9762\u901a\u8fc7\u5546\u54c1\u8ba2\u5355 ID\u6765\u641c\u7d22\uff0c\u524d\u7aef\u53ef\u4ee5\u5224\u65ad\u4e0b\u5bf9\u4e8e\u975e\u6cd5 ID\uff08\u5982\u8d1f\u6570\uff09\u7684\u8ba2\u5355\u76f4\u63a5\u62e6\u622a\u3002<\/li><li>\u540e\u7aef\u6821\u9a8c\uff1a\u5728\u63a5\u53e3\u7684\u5f00\u59cb\u5904\uff0c\u6821\u9a8c\u4e00\u4e9b\u5e38\u89c4\u7684\u6b63\u8d1f\u6570\uff0c\u6bd4\u5982\u8d1f\u6570\u7684<code>user_id<\/code>\u76f4\u63a5\u8fd4\u56de\u62a5\u9519\u3002<\/li><li>\u7a7a\u503c\u7f13\u5b58\uff1a\u6709\u65f6\u5019\u6211\u4eec\u4e5f\u5bf9\u4e8e\u6570\u636e\u5e93\u67e5\u4e0d\u5230\u7684\u6570\u636e\uff0c\u4e5f\u505a\u4e2a\u7f13\u5b58\uff0c\u8fd9\u4e2a\u7f13\u5b58\u7684\u65f6\u95f4\u53ef\u4ee5\u77ed\u4e00\u4e9b\u3002<\/li><li>hash \u62e6\u622a\uff1ahash \u6821\u9a8c\u4f7f\u7528\u4e00\u4e9b\u6570\u636e\u91cf\u4e0d\u591a\u7684\u573a\u666f\uff0c\u6bd4\u5982\u5e97\u94fa\u7684\u5546\u54c1\u4fe1\u606f\uff0c\u4e0a\u67b6\u4e00\u4e2a\u5546\u54c1\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5546\u54c1\u505a\u4e0bhash\u6807\u8bb0\uff08map[&#8220;\u5546\u54c1ID&#8221;]=1\uff09\uff0c\u8fd9\u6837\u5982\u679c\u8bf7\u6c42\u7684\u5546\u54c1 id \u90fd\u4e0d\u5728 hash \u8868\u91cc\uff0c\u76f4\u63a5\u8fd4\u56de\u4e86\u3002<\/li><li>\u4f4d\u56fe\u6807\u8bb0\uff1a\u7c7b\u4f3c hash\uff0c\u4f46\u662f\u4f7f\u7528\u6bd4\u7279\u4f4d\u6765\u6807\u8bb0\u3002<\/li><li>\u5e03\u9686\u8fc7\u6ee4\u5668\uff1a\u5f53\u6211\u4eec\u5173\u5fc3\u7684\u6570\u636e\u91cf\u975e\u5e38\u5927\u7684\u65f6\u5019 hash\u548c\u4f4d\u56fe\u90a3\u5f97\u591a\u5927\uff0c\u4e0d\u73b0\u5b9e\uff0c\u8fd9\u65f6\u53ef\u4ee5\u7528\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u5e03\u9686\u8fc7\u6ee4\u5668\u4e0d\u50cfhash\u548c\u4f4d\u56fe\u90a3\u6837\u53ef\u4ee5\u505a\u5230\u767e\u5206\u767e\u7684\u62e6\u622a\uff0c\u4f46\u662f\u53ef\u4ee5\u505a\u5230\u7edd\u5927\u90e8\u5206\u7684\u975e\u6cd5\u7684\u62e6\u622a\u3002\u5e03\u9686\u8fc7\u6ee4\u5668\u7684\u601d\u60f3\u5c31\u662f\u5728\u6709\u9650\u7684\u7a7a\u95f4\u91cc\uff0c\u901a\u8fc7\u591a\u4e2ahash\u51fd\u6570\u6765\u5b9a\u4f4d\u4e00\u6761\u6570\u636e\uff0c\u5f53\u53ea\u8981\u6709\u4e00\u4e2ahash\u6ca1\u4e2d\uff0c\u90a3\u4e48\u4e00\u5b9a\u662f\u4e0d\u5b58\u5728\u7684\uff0c\u4f46\u662f\u5f53\u591a\u4e2ahash\u5168\u4e2d\u7684\u8bdd\uff0c\u4e5f\u4e0d\u4e00\u5b9a\u662f\u5b58\u5728\u7684\uff0c\u8fd9\u4e00\u70b9\u662f\u9700\u8981\u6ce8\u610f\u7684\u3002<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f13\u5b58\u51fb\u7a7f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u70ed\u70b9\u6570\u636e\u5728\u67d0\u4e00\u65f6\u523b\u7f13\u5b58\u8fc7\u671f\uff0c\u7136\u540e\u7a81\u7136\u5927\u91cf\u8bf7\u6c42\u6253\u5230 db \u4e2d\uff0c\u8fd9\u65f6\u5982\u679c db \u625b\u4e0d\u4f4f\uff0c\u53ef\u80fd\u5c31\u6302\u4e86\uff0c\u5f15\u8d77\u7ebf\u4e0a\u8fde\u9501\u53cd\u5e94\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis4.png\" alt=\"\u7f13\u5b58\u51fb\u7a7f\" \/><figcaption>\u7f13\u5b58\u51fb\u7a7f<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u89e3\u51b3\u300d<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5206\u5e03\u5f0f\u9501\uff1a\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5e76\u53d1\u8bf7\u6c42\u7684\u95ee\u9898\uff0c\u7b2c\u4e00\u65f6\u95f4\u60f3\u5230\u7684\u5c31\u662f\u5206\u5e03\u5f0f\u9501\uff0c\u53ea\u653e\u4e00\u4e2a\u8bf7\u6c42\u8fdb\u53bb\uff08\u53ef\u4ee5\u7528redis setnx\u3001zookeeper\u7b49\u7b49\uff09<\/li><li>\u5355\u673a\u9501\uff1a\u4e5f\u5e76\u4e0d\u4e00\u5b9a\u975e\u5f97\u9700\u8981\u5206\u5e03\u5f0f\u9501\uff0c\u5355\u673a\u9501\u5728\u96c6\u7fa4\u8282\u70b9\u4e0d\u591a\u7684\u60c5\u51b5\u4e0b\u4e5f\u662fok\u7684\uff08golang \u53ef\u4ee5\u7528 synx.mutex\u3001java \u53ef\u4ee5\u7528 JVM \u9501\uff09\uff0c\u4fdd\u8bc1\u4e00\u53f0\u673a\u5668\u4e0a\u7684\u6240\u6709\u8bf7\u6c42\u4e2d\u53ea\u6709\u4e00\u4e2a\u80fd\u8fdb\u53bb\u3002\u5047\u8bbe\u4f60\u6709 10 \u53f0\u673a\u5668\uff0c\u90a3\u4e48\u6700\u591a\u4e5f\u5c31\u540c\u65f6 10 \u4e2a\u5e76\u53d1\u6253\u5230db\uff0c\u5bf9\u6570\u636e\u5e93\u6765\u8bf4\u5f71\u54cd\u4e5f\u4e0d\u5927\u3002\u76f8\u6bd4\u5206\u5e03\u5f0f\u9501\u6765\u8bf4\u5f00\u9500\u8981\u5c0f\u70b9\uff0c\u4f46\u662f\u5982\u679c\u4f60\u7684\u673a\u5668\u591a\u8fbe\u4e0a\u5343\uff0c\u8fd8\u662f\u614e\u91cd\u8003\u8651\u3002<\/li><li>\u4e8c\u7ea7\u7f13\u5b58\uff1a\u5f53\u6211\u4eec\u7684\u7b2c\u4e00\u7ea7\u7f13\u5b58\u5931\u6548\u540e\uff0c\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u4e8c\u7ea7\u7f13\u5b58\uff0c\u4e8c\u7ea7\u7f13\u5b58\u4e5f\u53ef\u4ee5\u62e6\u622a\u4e0b\uff0c\u4e8c\u7ea7\u7f13\u5b58\u53ef\u4ee5\u662f\u5185\u5b58\u7f13\u5b58\u4e5f\u53ef\u4ee5\u662f\u5176\u4ed6\u7f13\u5b58\u6570\u636e\u5e93\u3002<\/li><li>\u70ed\u70b9\u6570\u636e\u4e0d\u8fc7\u671f\uff1a\u67d0\u4e9b\u65f6\u5019\uff0c\u70ed\u70b9\u6570\u636e\u5c31\u4e0d\u8981\u8fc7\u671f\u3002<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f13\u5b58\u96ea\u5d29<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u67d0\u4e00\u4e9b\u65f6\u523b\uff0c\u7a81\u7136\u5927\u91cf\u7f13\u5b58\u5931\u6548\uff0c\u6240\u6709\u7684\u8bf7\u6c42\u90fd\u6253\u5230\u4e86 db\uff0c\u4e0e\u7f13\u5b58\u51fb\u7a7f\u4e0d\u540c\u7684\u662f\uff0c\u96ea\u5d29\u662f\u5927\u91cf\u7684 key\uff0c\u51fb\u7a7f\u662f\u4e00\u4e2a key\uff0c\u8fd9\u65f6 db \u7684\u538b\u529b\u4e5f\u4e0d\u8a00\u800c\u55bb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u89e3\u51b3\u300d<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u7f13\u5b58\u65f6\u95f4\u968f\u673a\u4e9b\uff1a\u5bf9\u4e8e\u6240\u6709\u7684\u7f13\u5b58\uff0c\u5c3d\u91cf\u8ba9\u6bcf\u4e2a key \u7684\u8fc7\u671f\u65f6\u95f4\u968f\u673a\u4e9b\uff0c\u964d\u4f4e\u540c\u65f6\u5931\u6548\u7684\u6982\u7387<\/li><li>\u4e0a\u9501\uff1a\u6839\u636e\u573a\u666f\u4e0a\u9501\uff0c\u4fdd\u62a4 db<\/li><li>\u4e8c\u7ea7\u7f13\u5b58\uff1a\u540c\u7f13\u5b58\u51fb\u7a7f<\/li><li>\u70ed\u70b9\u6570\u636e\u4e0d\u8fc7\u671f\uff1a\u540c\u7f13\u5b58\u51fb\u7a7f<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis5.png\" alt=\"\u7f13\u5b58\u96ea\u5d29\" \/><figcaption>\u7f13\u5b58\u96ea\u5d29<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u7684\u6301\u4e45\u5316\u65b9\u6848\u6709\u54ea\u4e9b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">rdb<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300csave\u300d<\/strong>\uff1aSAVE \u662f\u624b\u52a8\u4fdd\u5b58\u65b9\u5f0f\uff0c\u5b83\u4f1a\u4f7f redis \u8fdb\u7a0b\u963b\u585e\uff0c\u76f4\u81f3 RDB \u6587\u4ef6\u521b\u5efa\u5b8c\u6bd5\uff0c\u521b\u5efa\u671f\u95f4\u6240\u6709\u7684\u547d\u4ee4\u90fd\u4e0d\u80fd\u5904\u7406\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>127.0.0.1:6379&gt; save\nOK\n27004:M 31 Jul 15:06:11.761 * DB saved on disk<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300cbgsave\u300d<\/strong>\uff1a\u4e0e SAVE \u547d\u4ee4\u4e0d\u540c\u7684\u662f BGSAVE\uff0cBGSAVE \u53ef\u4ee5\u4e0d\u963b\u585e redis \u8fdb\u7a0b\uff0c\u901a\u8fc7 BGSAVE redis \u4f1a fork \u4e00\u4e2a\u5b50\u8fdb\u7a0b\u53bb\u6267\u884c rdb \u7684\u4fdd\u5b58\u5de5\u4f5c\uff0c\u4e3b\u8fdb\u7a0b\u7ee7\u7eed\u6267\u884c\u547d\u4ee4\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>127.0.0.1:6379&gt; BGSAVE\nBackground saving started\n27004:M 31 Jul 15:07:08.665 * Background saving terminated with success<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">BGSAVE \u6267\u884c\u671f\u95f4\u4e0e\u5176\u4ed6\u4e00\u4e9b IO \u547d\u4ee4\u4f1a\u5b58\u5728\u4e00\u4e9b\u4e92\u65a5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>BGSAVE \u671f\u95f4\uff0c\u6240\u6709\u7684 SAVE \u547d\u4ee4\u4f1a\u88ab\u62d2\u7edd\u6267\u884c\uff0c\u907f\u514d\u7236\u5b50\u8fdb\u7a0b\u540c\u65f6\u6267\u884c\uff0c\u9020\u6210\u4e00\u4e9b\u7ade\u4e89\u95ee\u9898\u3002<\/li><li>BGSAVE \u671f\u95f4\uff0c\u5982\u679c\u6709\u65b0\u7684 BGSAVE \u90a3\u4e48\u4e5f\u5c31\u88ab\u62d2\u7edd\uff0c\u4e5f\u662f\u7ade\u4e89\u95ee\u9898\u3002<\/li><li>BGSAVE \u671f\u95f4\uff0c\u5982\u679c\u6765\u4e86\u4e2a BGREWRITEAOF\uff0c\u90a3\u4e48 BGREWRITEAOF \u4f1a\u88ab\u5ef6\u8fdf\u5230BGSAVE\u4e4b\u540e\u518d\u6267\u884c\u3002<\/li><li>\u5982\u679c BGREWRITEAOF \u5728\u6267\u884c\uff0c\u90a3\u4e48 BGSAVE \u547d\u4ee4\u4f1a\u88ab\u62d2\u7edd\u3002<\/li><\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>BGSAVE \u4e0e BGREWRITEAOF \u90fd\u662f\u7531\u4e24\u4e2a\u5b50\u8fdb\u7a0b\u5904\u7406\uff0c\u76ee\u6807\u4e5f\u662f\u4e0d\u540c\u7684\u6587\u4ef6\uff0c\u672c\u8eab\u6ca1\u4ec0\u4e48\u51b2\u7a81\uff0c\u4e3b\u8981\u662f\u4e24\u4e2a\u90fd\u53ef\u80fd\u8981\u5927\u91cf\u7684 IO\uff0c\u8fd9\u5bf9\u670d\u52a1\u672c\u8eab\u6765\u8bf4\u4e0d\u662f\u5f88\u53cb\u597d\u3002\u275e<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\uff0c\u8ba9\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u6765\u6267\u884c bgsave\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>save 900 1 #900s\u5185\u81f3\u5c11\u4fee\u6539\u4e861\u6b21\nsave 300 10 #300s\u5185\u81f3\u5c11\u4fee\u6539\u4e8610\u6b21\nsave 60 10000 #60s\u5185\u81f3\u5c11\u4fee\u6539\u4e8610000\u6b21<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u6761\u4ef6\u53ea\u8981\u6ee1\u8db3\u4e86\u4e00\u4e2a\u5c31\u53ef\u4ee5\u6267\u884c bgsave\u3002<br>\n\u8fd9\u91cc\u6d89\u53ca\u5230\u4e24\u4e2a\u53c2\u6570\u6765\u8bb0\u5f55\u6b21\u6570\u548c\u65f6\u95f4\uff0c\u5206\u522b\u662f<strong>\u300cdirty\u300d<\/strong>\u8ba1\u6570\u5668\u548c<strong>\u300clastsave\u300d<\/strong>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>dirty \u8ba1\u6570\u5668\u8bb0\u5f55\u8ddd\u79bb\u4e0a\u4e00\u6b21\u6210\u529f\u6267\u884c SAVE \u547d\u4ee4\u6216\u8005 BGSAVE \u547d\u4ee4\u4e4b\u540e\uff0c\u670d\u52a1\u5668\u5bf9\u6570\u636e\u5e93\u72b6\u6001\uff08\u670d\u52a1\u5668\u4e2d\u7684\u6240\u6709\u6570\u636e\u5e93\uff09\u8fdb\u884c\u4e86\u591a\u5c11\u6b21\u4fee\u6539\uff08\u5305\u62ec\u5199\u5165\u3001\u5220\u9664\u3001\u66f4\u65b0\u7b49\u64cd\u4f5c\uff09\u3002<\/li><li>lastsave \u5c5e\u6027\u662f\u4e00\u4e2a UNIX \u65f6\u95f4\u6233\uff0c\u8bb0\u5f55\u4e86\u670d\u52a1\u5668\u4e0a\u4e00\u6b21\u6210\u529f\u6267\u884c SAVE \u547d\u4ee4\u6216\u8005 BGSAVE \u547d\u4ee4\u7684\u65f6\u95f4\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u4e24\u4e2a\u6307\u6807\u662f\u57fa\u4e8e redis \u7684 serverCron \u6765\u5b8c\u6210\u7684\uff0cserverCron \u662f\u4e00\u4e2a\u5b9a\u671f\u6267\u884c\u7684\u7a0b\u5e8f\uff0c\u9ed8\u8ba4\u6bcf\u9694 100ms \u6267\u884c\u4e00\u6b21\u3002\u6bcf\u6b21 serverCron \u6267\u884c\u7684\u65f6\u5019\u4f1a\u904d\u5386\u6240\u6709\u7684\u6761\u4ef6\uff0c\u7136\u540e\u68c0\u67e5\u8ba1\u6570\u662f\u5426 ok\uff0c\u65f6\u95f4\u662f\u5426 ok\uff0c\u90fdok\u7684\u8bdd\u5c31\u6267\u884c\u4e00\u6b21 bgsave\uff0c\u5e76\u4e14\u8bb0\u5f55\u6700\u65b0\u7684 lastsave \u65f6\u95f4\uff0c\u91cd\u7f6e dirty \u4e3a 0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u5bfc\u5165\u300d<\/strong>\uff1aredis \u6ca1\u6709\u4e13\u95e8\u7684\u7528\u6237\u5bfc\u5165\u7684\u547d\u4ee4\uff0credis \u5728\u542f\u52a8\u7684\u65f6\u5019\u4f1a\u68c0\u6d4b\u662f\u5426\u6709 RDB \u6587\u4ef6\uff0c\u6709\u7684\u8bdd\uff0c\u5c31\u81ea\u52a8\u5bfc\u5165\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>27004:M 31 Jul 14:46:51.793 # Server started, Redis version 3.2.12\n27004:M 31 Jul 14:46:51.793 * DB loaded from disk: 0.000 seconds\n27004:M 31 Jul 14:46:51.793 * The server is now ready to accept connections on port 6379<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>DB loaded from<\/code> disk \u5c31\u662f\u8f7d\u5165 rdb \u7684\u63cf\u8ff0\uff0c\u670d\u52a1\u5728\u8f7d\u5165 RDB \u671f\u95f4\u662f\u963b\u585e\u7684\u3002\u5f53\u7136\u5982\u679c\u4e5f\u5f00\u542f\u4e86 AOF\uff0c\u90a3\u4e48\u5c31\u4f1a\u4f18\u5148\u4f7f\u7528 AOF \u6765\u6062\u590d\uff0c\u53ea\u6709\u5728\u670d\u52a1\u5668\u672a\u5f00\u542f AOF \u7684\u65f6\u5019\uff0c\u624d\u4f1a\u9009\u62e9 RDB \u6765\u6062\u590d\u6570\u636e\uff0c\u5bfc\u5165\u7684\u65f6\u5019\u4e5f\u4f1a\u81ea\u52a8\u8fc7\u6ee4\u8fc7\u671f\u7684 key\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">aof<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">AOF \u5c31\u662f\u4e00\u4e2a\u547d\u4ee4\u8ffd\u52a0\u7684\u6a21\u5f0f\uff0c\u5047\u8bbe\u6267\u884c\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>RPUSH list 1 2 3 4\nRPOP list\nLPOP list\nLPUSH list 1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u7ec8\u4ee5 redis \u534f\u8bae\u65b9\u5f0f\u5b58\u50a8\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>*2$6SELECT$10*6$5RPUSH$4list$11$12$13$14*2$4RPOP$4list*2$4LPOP$4list*3$5LPUSH$4list$11<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">aof \u5148\u662f\u5199\u5230<code>aof_buf<\/code>\u7684\u7f13\u51b2\u533a\u4e2d\uff0credis \u63d0\u4f9b\u4e09\u79cd\u65b9\u6848\u5c06 buf \u7684\u7f13\u51b2\u533a\u7684\u6570\u636e\u5237\u5230\u78c1\u76d8\uff0c\u5f53\u7136\u4e5f\u662f serverCron \u6765\u6839\u636e\u7b56\u7565\u5904\u7406\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>appendfsync always\nappendfsync everysec\nappendfsync no<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\"><li><strong>\u300calways\u300d<\/strong>\uff1a\u5c06<code>aof_buf<\/code>\u7f13\u51b2\u533a\u6240\u6709\u7684\u5185\u5bb9\u5199\u5165\u5e76\u540c\u6b65\u5230 AOF \u6587\u4ef6\u3002<\/li><li><strong>\u300ceverysec\u300d<\/strong>\uff1a\u5c06<code>aof_buf<\/code>\u7f13\u51b2\u533a\u6240\u6709\u7684\u5185\u5bb9\u5199\u5165 AOF \u6587\u4ef6\uff0c\u5982\u679c\u4e0a\u6b21\u540c\u6b65\u7684\u65f6\u95f4\u548c\u8fd9\u6b21\u7684\u8d85\u8fc7 1s\uff0c\u90a3\u4e48\u518d\u6b21\u6267\u884c\u540c\u6b65\uff0c\u5e76\u4e14\u8fd9\u4e2a\u540c\u6b65\u662f\u7531\u4e00\u4e2a\u7ebf\u7a0b\u5b8c\u6210\u7684\u3002<\/li><li><strong>\u300cno\u300d<\/strong>\uff1a\u5c06<code>aof_buf<\/code>\u5199\u5165 AOF \u6587\u4ef6\uff0c\u4f46\u662f\u4e0d\u6267\u884c\u540c\u6b65\uff0c\u4f55\u65f6\u540c\u6b65\u7531\u64cd\u4f5c\u7cfb\u7edf\u51b3\u5b9a\u3002<\/li><\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>\u5728\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6587\u4ef6\u5199\u5165\u7684\u6548\u7387\uff0c\u5f53\u6211\u4eec\u8c03\u7528 write \u5199\u5165\u4e00\u4e2a\u6570\u636e\u7684\u65f6\u5019\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5e76\u4e0d\u4f1a\u7acb\u523b\u5199\u5165\u78c1\u76d8\uff0c\u800c\u662f\u653e\u5728\u4e00\u4e2a\u7f13\u51b2\u533a\u91cc\uff0c\u5f53\u7f13\u51b2\u533a\u6ee1\u4e86\u6216\u8005\u5230\u4e86\u4e00\u5b9a\u65f6\u95f4\u540e\uff0c\u624d\u4f1a\u771f\u6b63\u7684\u5237\u5165\u5230\u78c1\u76d8\u4e2d\u3002\u8fd9\u6837\u5b58\u5728\u4e00\u5b9a\u98ce\u9669\uff0c\u5c31\u662f\u5185\u5b58\u7684\u6570\u636e\u6ca1\u7b49\u5230\u5237\u5165\u78c1\u76d8\u7684\u65f6\u5019\uff0c\u673a\u5668\u5b95\u673a\u4e86\uff0c\u90a3\u4e48\u6570\u636e\u5c31\u4e22\u5931\u4e86\uff0c\u4e8e\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e5f\u63d0\u4f9b\u4e86\u540c\u6b65\u51fd\u6570 fsync\uff0c\u8ba9\u7528\u6237\u53ef\u4ee5\u81ea\u5df1\u51b3\u5b9a\u4ec0\u4e48\u65f6\u5019\u540c\u6b65\u3002\u275e<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300cAOF\u91cd\u5199\u300d<\/strong>\uff1a\u968f\u7740\u547d\u4ee4\u8d8a\u6765\u8d8a\u591a\uff0caof \u7684\u4f53\u79ef\u4f1a\u8d8a\u6765\u8d8a\u5927\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>incr num\nincr num\nincr num\nincr num<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c 4 \u6761 incr num\uff0cnum \u7684\u6700\u7ec8\u7684\u503c\u662f 4\uff0c\u7136\u540e\u53ef\u4ee5\u76f4\u63a5\u7528\u4e00\u6761<code>set num 4<\/code>\u4ee3\u66ff\uff0c\u8fd9\u6837\u5b58\u50a8\u5c31\u8282\u7701\u4e86\u5f88\u591a\u3002\u91cd\u5199\u4e5f\u4e0d\u662f\u5206\u6790\u73b0\u6709 aof\uff0c\u91cd\u5199\u5c31\u662f\u4ece\u6570\u636e\u5e93\u8bfb\u53d6\u73b0\u6709\u7684 key\uff0c\u7136\u540e\u5c3d\u91cf\u7528\u4e00\u6761\u547d\u4ee4\u4ee3\u66ff\u3002\u5e76\u4e0d\u662f\u6240\u6709\u7684\u90fd\u53ef\u4ee5\u7528\u4e00\u6761\u547d\u4ee4\u4ee3\u66ff\uff0c\u4f8b\u5982 sadd \u6bcf\u6b21\u6700\u591a\u53ea\u80fd add 64 \u4e2a\uff0c\u5982\u679c\u8d85\u8fc7 64 \u4e2a\u5c31\u8981\u5206\u6279\u4e86\u3002<br>\n<strong>\u300c\u521b\u5efa\u65b0\u7684aof -&gt; \u904d\u5386\u6570\u636e\u5e93 -&gt;\u904d\u5386\u6240\u6709\u7684key-&gt;\u5ffd\u7565\u8fc7\u671f\u7684-&gt;\u5199\u5165aof\u3002\u300d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300cfork\u300d<\/strong>\uff1aaof \u7684\u91cd\u5199\u6d89\u53ca\u5927\u91cf\u7684 IO\uff0c\u5728\u5f53\u524d\u8fdb\u7a0b\u91cc\u53bb\u505a\u80af\u5b9a\u4e0d\u5408\u9002\uff0c\u7406\u6240\u5f53\u7136\u4e5f\u662f fork \u4e00\u4e2a\u5b50\u8fdb\u7a0b\u6765\u505a\uff0c\u4e0d\u4f7f\u5b50\u7ebf\u7a0b\u7684\u539f\u56e0\u662f\u907f\u514d\u4e00\u4e9b\u9501\u7684\u95ee\u9898\u3002 \u4f7f\u7528\u5b50\u8fdb\u7a0b\u9700\u8981\u8003\u8651\u7684\u95ee\u9898\u5c31\u662f\u5728\u5b50\u8fdb\u7a0b\u5199\u5165\u7684\u65f6\u5019\uff0c\u4e3b\u8fdb\u7a0b\u8fd8\u5728\u6e90\u6e90\u4e0d\u65ad\u7684\u63a5\u6536\u65b0\u7684\u8bf7\u6c42\uff0c\u90a3\u4e48\u9488\u5bf9\u8fd9\u79cd\u60c5\u51b5 redis \u8bbe\u7f6e\u4e86\u4e00\u4e2a aof \u91cd\u5199\u7f13\u51b2\u533a\uff0c\u7f13\u51b2\u533a\u5728\u5b50\u8fdb\u7a0b\u521b\u5efa\u7684\u65f6\u5019\u5f00\u59cb\u4f7f\u7528\uff0c\u90a3\u4e48\u5728\u65b0\u7684\u8bf7\u6c42\u6765\u7684\u65f6\u5019\uff0c\u9664\u4e86\u5199\u5165 aof \u7f13\u51b2\u533a\u5916\uff0c\u8fd8\u8981\u5199\u5165 aof \u91cd\u5199\u7f13\u51b2\u533a\uff0c\u6b64\u8fc7\u7a0b\u4e0d\u963b\u585e\u3002 \u90a3\u4e48\u5728\u5b50\u8fdb\u7a0b\u91cd\u5199\u5b8c\u4e86\u4e4b\u540e\uff0c\u4f1a\u53d1\u4fe1\u53f7\u7ed9\u4e3b\u8fdb\u7a0b\uff0c\u4e3b\u8fdb\u7a0b\u6536\u5230\u4fe1\u53f7\u540e\uff0c\u4f1a\u628a\u91cd\u5199\u7f13\u51b2\u533a\u7684\u6570\u636e\u518d\u6b21\u540c\u6b65\u7ed9\u65b0\u7684 aof \u6587\u4ef6\uff0c\u7136\u540e rename \u65b0\u7684 aof\uff0c\u539f\u5b50\u7684\u8986\u76d6\u8001\u7684 aof\uff0c\u5b8c\u6210\u91cd\u5199\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u963b\u585e\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u4f55\u65f6\u6267\u884c\u91cd\u5199\u300d<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>auto-aof-rewrite-percentage 100\nauto-aof-rewrite-min-size 64mb<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\"><li>100 \u4ee3\u8868\u5f53\u524d AOF \u6587\u4ef6\u662f\u4e0a\u6b21\u91cd\u5199\u7684\u4e24\u500d\u65f6\u5019\u624d\u91cd\u5199<\/li><li>\u6587\u4ef6\u6700\u5c0f\u91cd\u5199\u5927\u5c0f \u9ed8\u8ba4 64mb<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u5bfc\u5165\u300d<\/strong>\uff1a redis \u542f\u52a8\u7684\u65f6\u5019\uff0c\u4f1a\u521b\u5efa\u4e00\u4e2a\u4f2a\u5ba2\u6237\u7aef\uff0c\u7136\u540e\u6267\u884c aof \u6587\u4ef6\u91cc\u9762\u7684\u547d\u4ee4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">redis \u8fc7\u671f\u952e\u662f\u5982\u4f55\u5220\u9664\u7684<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u60f0\u6027\u5220\u9664\uff1a\u6bcf\u5f53\u6211\u4eec\u83b7\u53d6\u4e00\u4e2a key \u7684\u65f6\u5019\uff0c\u5148\u53bb\u68c0\u67e5\u4e0b\u5b83\u7684\u8fc7\u671f\u65f6\u95f4\u662f\u5426\u5df2\u5230\uff0c\u5982\u679c\u5df2\u7ecf\u8fc7\u671f\uff0c\u90a3\u4e48\u6267\u884c\u5220\u9664\u3002<\/li><li>\u5b9a\u671f\u5220\u9664\uff1aredis \u5bf9\u4e8e\u5e26\u8fc7\u671f\u65f6\u95f4\u7684\u548c\u4e0d\u5e26\u8fc7\u671f\u65f6\u95f4\u7684 key \u5206\u4e86\u4e24\u4e2a\u5b57\u5178\uff0cserverCron \u6bcf\u6b21\u6267\u884c\u7684\u65f6\u5019\u4f1a\u4ece\u5e26\u8fc7\u671f\u65f6\u95f4\u7684\u5b57\u5178\u91cc\u968f\u673a\u53d6\u4e00\u90e8\u5206 key \u68c0\u67e5\uff0c\u5982\u679c\u8fc7\u671f\u5219\u5220\u9664\u3002<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">rdb\u548caof\u5bf9\u8fc7\u671f\u952e\u662f\u5982\u4f55\u5904\u7406\u7684<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300crdb\u300d<\/strong>\uff1a\u5bf9\u4e8e\u4e3b\u4ece\u6a21\u5f0f\u6765\u8bf4\uff0c\u4e3b\u670d\u52a1\u5668\u8f7d\u5165 rdb \u6587\u4ef6\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u8fc7\u6ee4\u8fc7\u671f\u7684key\uff0c\u4ece\u670d\u52a1\u5668\u8f7d\u5165 rdb \u6587\u4ef6\u7684\u65f6\u5019\u4e0d\u4f1a\u8fc7\u6ee4\u8fc7\u671f\u7684 key\uff0c\u56e0\u4e3a\u4e3b\u4ece\u5728\u8fdb\u884c\u540c\u6b65\u6570\u636e\u7684\u65f6\u5019\uff0c\u4ece\u4f1a\u6e05\u7a7a\u81ea\u5df1\u7684\u6570\u636e\u3002<br>\n<strong>\u300caof\u300d<\/strong>\uff1a\u5f53\u670d\u52a1\u5668\u4ee5 AOF \u6301\u4e45\u5316\u6a21\u5f0f\u8fd0\u884c\u65f6\uff0c\u5982\u679c\u6570\u636e\u5e93\u4e2d\u7684\u67d0\u4e2a\u952e\u5df2\u7ecf\u8fc7\u671f\uff0c\u4f46\u5b83\u8fd8\u6ca1\u6709\u88ab\u60f0\u6027\u5220\u9664\u6216\u8005\u5b9a\u671f\u5220\u9664\uff0c\u90a3\u4e48 AOF \u6587\u4ef6\u4e0d\u4f1a\u56e0\u4e3a\u8fd9\u4e2a\u8fc7\u671f\u952e\u800c\u4ea7\u751f\u4efb\u4f55\u5f71\u54cd\u3002\u5f53\u8fc7\u671f\u952e\u88ab\u60f0\u6027\u5220\u9664\u6216\u8005\u5b9a\u671f\u5220\u9664\u4e4b\u540e\uff0c\u7a0b\u5e8f\u4f1a\u5411 AOF \u6587\u4ef6\u8ffd\u52a0\uff08append\uff09\u4e00\u6761 DEL \u547d\u4ee4\uff0c\u6765\u663e\u5f0f\u5730\u8bb0\u5f55\u8be5\u952e\u5df2\u88ab\u5220\u9664\u3002aof \u91cd\u5199\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u8fc7\u6ee4\u8fc7\u671f\u7684 key\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3b\u4ece\u6a21\u5f0f\u4e0b\u8fc7\u671f\u952e\u662f\u600e\u6837\u7684<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u822c\u4e3b\u4ece\u6a21\u5f0f\u4e0b\uff0c\u4e3b\u8d1f\u8d23\u63d0\u4f9b\u5199\uff0c\u4ece\u8d1f\u8d23\u63d0\u4f9b\u8bfb\u3002\u4ece\u670d\u52a1\u5668\u5728\u6267\u884c\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u8bfb\u547d\u4ee4\u65f6\uff0c\u5373\u4f7f\u78b0\u5230\u8fc7\u671f\u952e\u4e5f\u4e0d\u4f1a\u5c06\u8fc7\u671f\u952e\u5220\u9664\uff0c\u800c\u662f\u7ee7\u7eed\u50cf\u5904\u7406\u672a\u8fc7\u671f\u7684\u952e\u4e00\u6837\u6765\u5904\u7406\u8fc7\u671f\u952e\u3002\u4e3b\u670d\u52a1\u5668\u5728\u5220\u9664\u4e00\u4e2a\u8fc7\u671f\u952e\u4e4b\u540e\uff0c\u4f1a\u663e\u5f0f\u5730\u5411\u6240\u6709\u4ece\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2a DEL \u547d\u4ee4\uff0c\u544a\u77e5\u4ece\u670d\u52a1\u5668\u5220\u9664\u8fd9\u4e2a\u8fc7\u671f\u952e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u7684\u6dd8\u6c70\u7b56\u7565\u662f\u600e\u6837\u7684<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6dd8\u6c70\u7b56\u7565\u662f\u4e00\u4e2a\u7075\u6d3b\u7684\u914d\u7f6e\u9009\u9879\uff0c\u4e00\u822c\u6839\u636e\u4e1a\u52a1\u6765\u9009\u62e9\u5408\u9002\u7684\u6dd8\u6c70\u7b56\u7565\uff0c\u5f53\u7136\u662f\u6211\u4eec\u8fdb\u884c add key \u6216\u8005 update \u4e00\u4e2a\u66f4\u5927\u7684 key\uff0c\u8fd9\u65f6\u5019\u5982\u679c\u5185\u5b58\u4e0d\u8db3\u4f1a\u89e6\u53d1\u6211\u4eec\u8bbe\u7f6e\u7684\u6dd8\u6c70\u7b56\u7565\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>noeviction\uff1a\u5f53\u5185\u5b58\u4f7f\u7528\u8d85\u8fc7\u914d\u7f6e\u7684\u65f6\u5019\u4f1a\u8fd4\u56de\u9519\u8bef\uff0c\u4e0d\u4f1a\u9a71\u9010\u4efb\u4f55\u952e<\/li><li>allkeys-lru\uff1a\u901a\u8fc7LRU\u7b97\u6cd5\u9a71\u9010\u6700\u4e45\u6ca1\u6709\u4f7f\u7528\u7684\u952e<\/li><li>volatile-lru\uff1a\u901a\u8fc7LRU\u7b97\u6cd5\u4ece\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u952e\u96c6\u5408\u4e2d\u9a71\u9010\u6700\u4e45\u6ca1\u6709\u4f7f\u7528\u7684\u952e<\/li><li>allkeys-random\uff1a\u4ece\u6240\u6709key\u4e2d\u968f\u673a\u5220\u9664<\/li><li>volatile-random\uff1a\u4ece\u8fc7\u671f\u952e\u7684\u96c6\u5408\u4e2d\u968f\u673a\u9a71\u9010<\/li><li>volatile-ttl\uff1a\u4ece\u914d\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u952e\u4e2d\u9a71\u9010\u9a6c\u4e0a\u5c31\u8981\u8fc7\u671f\u7684\u952e<\/li><li>volatile-lfu\uff1a\u4ece\u6240\u6709\u914d\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u952e\u4e2d\u9a71\u9010\u4f7f\u7528\u9891\u7387\u6700\u5c11\u7684\u952e<\/li><li>allkeys-lfu\uff1a\u4ece\u6240\u6709\u952e\u4e2d\u9a71\u9010\u4f7f\u7528\u9891\u7387\u6700\u5c11\u7684\u952e<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">serverCron\u662f\u5e72\u561b\u7684<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">redis\u5185\u90e8\u6709\u5b9a\u671f\u6267\u884c\u7684\u51fd\u6570<code>servercron<\/code>\uff0c\u5b83\u9ed8\u8ba4\u6bcf\u9694 100ms \u6267\u884c\u4e00\u6b21\uff0c\u5b83\u7684\u4f5c\u7528\u4e3b\u8981\u662f\u4ee5\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><em><strong>\u300c\u66f4\u65b0\u670d\u52a1\u5668\u65f6\u95f4\u7f13\u5b58\u300d<\/strong><\/em>\uff1aredis\u6709\u4e0d\u5c11\u529f\u80fd\u9700\u8981\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\uff0c\u6bcf\u6b21\u83b7\u53d6\u65f6\u95f4\u7684\u8bdd\u8981\u8fdb\u884c\u4e00\u6b21\u7cfb\u7edf\u8c03\u7528\uff0c\u5bf9\u4e8e\u4e00\u4e9b\u5bf9\u65f6\u95f4\u5b9e\u65f6\u6027\u8981\u6c42\u4e0d\u662f\u5f88\u9ad8\u7684\u573a\u666f\uff0credis\u901a\u8fc7\u7f13\u5b58\u6765\u51cf\u5c11\u7cfb\u7edf\u8c03\u7528\u7684\u6b21\u6570\u3002\u5b9e\u65f6\u6027\u8981\u6c42\u4e0d\u9ad8\u7684\u4e3b\u8981\u6709\uff1a\u6253\u5370\u65e5\u5fd7\u3001\u66f4\u65b0\u670d\u52a1\u5668\u7684LRU\u65f6\u949f\u3001\u51b3\u5b9a\u662f\u5426\u6267\u884c\u6301\u4e45\u5316\u4efb\u52a1\u3001\u8ba1\u7b97\u670d\u52a1\u5668\u4e0a\u7ebf\u65f6\u95f4\u3002\u5bf9\u4e8e\u8bbe\u7f6e\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u3001\u6dfb\u52a0\u6162\u67e5\u8be2\u65e5\u5fd7\u8fd8\u662f\u4f1a\u7cfb\u7edf\u8c03\u7528\u83b7\u53d6\u5b9e\u65f6\u65f6\u95f4\u7684\u3002<\/li><li><em><strong>\u300c\u66f4\u65b0LRU\u65f6\u949f\u300d<\/strong><\/em>\uff1aredis\u4e2d\u6709\u4e2a<code>lruclock<\/code>\u5c5e\u6027\u7528\u4e8e\u4fdd\u5b58\u670d\u52a1\u5668\u7684lru\u65f6\u949f\uff0c\u6bcf\u4e2a\u5bf9\u8c61\u4e5f\u6709\u4e00\u4e2alru\u65f6\u949f\uff0c\u901a\u8fc7\u670d\u52a1\u5668\u7684lru\u51cf\u53bb\u5bf9\u8c61\u7684lru\uff0c\u53ef\u4ee5\u5f97\u51fa\u5bf9\u8c61\u7684\u7a7a\u8f6c\u65f6\u95f4\uff0cserverCron\u9ed8\u8ba4\u4f1a\u4ee5\u6bcf10s\u4e00\u6b21\u66f4\u65b0\u4e00\u6b21lruclock\uff0c\u6240\u4ee5\u8fd9\u4e5f\u662f\u4e00\u4e2a\u6a21\u7cca\u503c\u3002<\/li><li><em><strong>\u300c\u66f4\u65b0\u6bcf\u79d2\u6267\u884c\u7684\u6b21\u6570\u300d<\/strong><\/em>\uff1a\u8fd9\u662f\u4e00\u4e2a\u4f30\u7b97\u503c\uff0c\u6bcf\u6b21\u6267\u884c\u7684\u65f6\u5019\uff0c\u4f1a\u6839\u636e\u4e0a\u4e00\u6b21\u62bd\u6837\u65f6\u95f4\u548c\u670d\u52a1\u5668\u7684\u5f53\u524d\u65f6\u95f4\uff0c\u4ee5\u53ca\u4e0a\u4e00\u6b21\u62bd\u6837\u7684\u5df2\u6267\u884c\u547d\u4ee4\u6570\u91cf\u548c\u670d\u52a1\u5668\u5f53\u524d\u7684\u5df2\u6267\u884c\u547d\u4ee4\u6570\u91cf\uff0c\u8ba1\u7b97\u51fa\u4e24\u6b21\u8c03\u7528\u4e4b\u95f4\uff0c\u670d\u52a1\u5668\u5e73\u5747\u6bcf\u6beb\u79d2\u5904\u7406\u4e86\u591a\u5c11\u4e2a\u547d\u4ee4\u8bf7\u6c42\uff0c\u7136\u540e\u5c06\u8fd9\u4e2a\u5e73\u5747\u503c\u4e58\u4ee51000\uff0c\u8fd9\u5c31\u5f97\u5230\u4e86\u670d\u52a1\u5668\u5728\u4e00\u79d2\u949f\u5185\u80fd\u5904\u7406\u591a\u5c11\u4e2a\u547d\u4ee4\u8bf7\u6c42\u7684\u4f30\u8ba1\u503c\u3002<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>INFO stats\n...\ninstantaneous_ops_per_sec:1<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li><em><strong>\u300c\u66f4\u65b0\u5185\u5b58\u5cf0\u503c\u300d<\/strong><\/em>\uff1a\u6bcf\u6b21\u6267\u884c\u7684\u65f6\u5019\u4f1a\u67e5\u770b\u5f53\u524d\u5185\u5b58\u4f7f\u7528\u91cf\uff0c\u7136\u540e\u548c\u4e0a\u4e00\u6b21\u7684\u5cf0\u503c\u5bf9\u6bd4\uff0c\u5224\u65ad\u662f\u5426\u9700\u8981\u66f4\u65b0\u5cf0\u503c\u3002<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>INFO stats\n...\nused_memory_peak:2026832\nused_memory_peak_human:1.93M<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li><em><strong>\u300c\u5904\u7406SIGTERM\u4fe1\u53f7\u300d<\/strong><\/em>\uff1a\u6536\u5230SIGTERM\u4fe1\u53f7\u7684\u65f6\u5019\uff0credis\u4f1a\u6253\u4e2a\u6807\u8bc6\uff0c\u7136\u540e\u7b49\u5f85serverCron\u5230\u6765\u7684\u65f6\u5019\uff0c\u6839\u636e\u6807\u8bc6\u72b6\u6001\u5904\u7406\u4e00\u4e9b\u5728shutdown\u4e4b\u524d\u7684\u5de5\u4f5c\uff0c\u6bd4\u5982\u6301\u4e45\u5316\u3002<\/li><li><em><strong>\u300c\u5904\u7406\u5ba2\u6237\u7aef\u8d44\u6e90\u300d<\/strong><\/em>\uff1a\u5982\u679c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u4e4b\u95f4\u5f88\u957f\u65f6\u95f4\u6ca1\u901a\u4fe1\u4e86\uff0c\u90a3\u4e48\u5c31\u4f1a\u91ca\u653e\u8fd9\u4e2a\u5ba2\u6237\u7aef\u3002\u5982\u679c\u8f93\u5165\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u8d85\u8fc7\u4e86\u4e00\u5b9a\u957f\u5ea6\uff0c\u90a3\u4e48\u5c31\u4f1a\u91ca\u653e\u5f53\u524d\u5ba2\u6237\u7aef\u7684\u8f93\u5165\u7f13\u51b2\u533a\uff0c\u7136\u540e\u91cd\u5efa\u4e00\u4e2a\u9ed8\u8ba4\u5927\u5c0f\u7684\u8f93\u5165\u7f13\u51b2\u533a\uff0c\u9632\u6b62\u8f93\u5165\u7f13\u51b2\u533a\u5360\u7528\u8f83\u5927\u7684\u5185\u5b58\u3002\u540c\u65f6\u4e5f\u4f1a\u5173\u95ed\u8f93\u51fa\u7f13\u51b2\u533a\u8d85\u8fc7\u9650\u5236\u7684\u5ba2\u6237\u7aef\u3002<\/li><li><em><strong>\u300c\u5ef6\u8fdf\u6267\u884caof\u91cd\u5199\u300d<\/strong><\/em>\uff1a\u5728\u670d\u52a1\u5668\u6267\u884cBGSAVE\u7684\u65f6\u5019\uff0c\u5982\u679cBGREWRITEAOF\u4e5f\u5230\u6765\u4e86\uff0c\u90a3\u4e48BGREWRITEAOF\u4f1a\u88ab\u5ef6\u8fdf\u5230BGSAVE\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u8fd9\u65f6\u4f1a\u8bb0\u4e2a\u6807\u8bb0<code>aof_rewrite_scheduled<\/code>\uff0c\u6bcf\u6b21serverCron\u6267\u884c\u7684\u65f6\u5019\u4f1a\u68c0\u67e5\u5f53\u524d\u662f\u5426\u6709BGSAVE\u6216BGREWRITEAOF\u5728\u6267\u884c\uff0c\u5982\u679c\u6ca1\u6709\u4e14aof_rewrite_scheduled\u5df2\u6807\u8bb0\uff0c\u90a3\u4e48\u5c31\u4f1a\u6267\u884cBGREWRITEAOF\u3002<\/li><li><em><strong>\u300c\u6301\u4e45\u5316\u300d<\/strong><\/em>\uff1aserverCron\u6bcf\u6b21\u6267\u884c\u7684\u65f6\u5019\uff0c\u4f1a\u5224\u65ad\u5f53\u524d\u662f\u5426\u5728\u8fdb\u884c\u6301\u4e45\u5316\uff0c\u5982\u679c\u6ca1\u6709\u7684\u8bdd\uff0c\u4f1a\u5224\u65adaof\u91cd\u5199\u662f\u5426\u88ab\u5ef6\u8fdf\uff0c\u5ef6\u8fdf\u7684\u8bdd\uff0c\u6267\u884caof\u91cd\u5199\uff0c\u6ca1\u6709\u7684\u8bdd\uff0c\u4f1a\u68c0\u67e5rdb\u6761\u4ef6\u662f\u5426\u6ee1\u8db3\uff0c\u6ee1\u8db3\u7684\u8bdd\u6267\u884crdb\u6301\u4e45\u5316\uff0c\u5426\u5219\u5224\u65adaof\u91cd\u5199\u6761\u4ef6\u662f\u5426\u6ee1\u8db3\uff0c\u6ee1\u8db3\u7684\u8bdd\u6267\u884caof\u91cd\u5199\u3002\u5728\u5f00\u542faof\u7684\u65f6\u5019\uff0c\u4f1a\u6839\u636e\u8bbe\u7f6e\u770b\u9700\u4e0d\u9700\u8981\u628aaof\u7f13\u51b2\u533a\u7684\u6570\u636e\u5199\u5165\u5230aof\u6587\u4ef6\u4e2d\u3002<\/li><li><em><strong>\u300c\u8bb0\u5f55\u6267\u884c\u6b21\u6570\u300d<\/strong><\/em>\uff1aserverCron\u6bcf\u6b21\u6267\u884c\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u8bb0\u5f55\u4e0b\u6267\u884c\u7684\u6b21\u6570\u3002<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">slave\u65ad\u7ebf\u91cd\u8fde\u540e\u4f1a\u53d1\u751f\u4ec0\u4e48<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 slave \u6267\u884c slave of \u4e4b\u540e\uff0c\u4f1a\u53d1\u4e2a sync \u547d\u4ee4\u7ed9 master\uff0cmaster \u5728\u6536\u5230 sync \u4e4b\u540e\uff0c\u5f00\u59cb\u5728\u540e\u53f0\u6267\u884c bgsave\uff0c\u540c\u65f6\u8fd9\u671f\u95f4\u7684\u5199\u8bb0\u5f55\u5728\u7f13\u51b2\u533a\u4e2d\uff0c\u5f53bgsave\u5b8c\u6210\u4e4b\u540e\uff0cmaster\u4f1a\u628ardb\u53d1\u7ed9\u4ece\uff0cslave \u6839\u636e rdb \u52a0\u8f7d\u6570\u636e\uff0c\u540c\u65f6master\u628a\u7f13\u51b2\u533a\u91cc\u7684\u53d8\u66f4\u4e5f\u53d1\u7ed9slave\uff0c\u540e\u7eed master \u7684\u53d8\u66f4\u8bb0\u5f55\u90fd\u4f1a\u901a\u8fc7\u547d\u4ee4\u4f20\u64ad\u7684\u5f62\u5f0f\u4f20\u7ed9slave\u3002\u7136\u800c\u5982\u679c\u5728\u67d0\u4e2a\u65f6\u523b\u56e0\u4e3a\u7f51\u7edc\u539f\u56e0slave\u548cmanster\u65ad\u7ebf\u4e86\uff0c\u8fd9\u65f6\u5019\u5982\u679cslave\u8fde\u63a5\u4e0a\u4e86\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\uff1f\u65ad\u7ebf\u671f\u95f4\u7684\u53d8\u66f4\u600e\u4e48\u529e\uff1f<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5728redis2.8\u4ee5\u524d\uff0c\u54ea\u6015slave\u65ad\u7ebf1s\uff0c\u53ea\u8981\u8fde\u4e0a\u4e4b\u540e\u53d1\u9001sync\uff0c\u90a3\u4e48master\u5c31\u4f1a\u65e0\u8111\u6267\u884cbgsave\uff0c\u7136\u540e\u53d1\u9001\u7ed9slave\uff0cslave\u518d\u91cd\u65b0load rdb\uff0c\u53ef\u4ee5\u770b\u51fa\u6574\u4e2a\u8fc7\u7a0b\u8fd8\u662f\u975e\u5e38\u4f4e\u6548\u7684\uff0c\u672c\u8eabbgsave\u5c31\u975e\u5e38\u8017\u8d39IO\uff0c\u53d1\u9001\u6570\u636e\u8fd8\u8017\u8d39\u5e26\u5bbd\u3002<\/li><li>\u4eceredis2.8\u5f00\u59cb\uff0c\u652f\u6301\u589e\u91cf\u590d\u5236\uff0c\u5982\u679c\u65ad\u7ebf\u4e86\u4e14\u540e\u6765\u91cd\u8fde\u4e0a\u4e86\uff0c\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\uff0c\u652f\u6301\u628a\u65ad\u7ebf\u671f\u95f4\u4e22\u5931\u7684\u53d8\u66f4\u5355\u72ec\u540c\u6b65\uff0c\u4e0d\u7528\u540c\u6b65\u6574\u4e2ardb\u6587\u4ef6\u3002\u5b9e\u73b0\u90e8\u5206\u540c\u6b65\u7684\u5173\u952e\u4e3b\u8981\u662f<strong>\u300c\u4e3b\u4ece\u7684\u590d\u5236\u504f\u79fb\u91cf\u300d<\/strong>\uff0c<strong>\u300c\u4e3b\u7684\u590d\u5236\u79ef\u538b\u7f13\u51b2\u533a\u300d<\/strong>\uff0c\u4ee5\u53ca<strong>\u300c\u670d\u52a1\u5668\u7684\u8fd0\u884cid\uff08run_id\uff09\u300d<\/strong> \u4e09\u4e2a\u6307\u6807\u3002slave\u5728\u7b2c\u4e00\u6b21slave of master\u4e4b\u540e\u4f1a\u4fdd\u5b58master\u7684run_id\u3002\u6bcf\u5f53master\u628a\u547d\u4ee4\u540c\u6b65\u7ed9\u4ece\u7684\u65f6\u5019\uff0c\u81ea\u5df1\u4f1a\u8bb0\u5f55\u540c\u6b65\u7684\u504f\u79fb\u91cf\uff0cslave\u5728\u63a5\u6536\u5230master\u540c\u6b65\u7684\u6570\u636e\u4e4b\u540e\uff0c\u4e5f\u4f1a\u8bb0\u5f55\u81ea\u5df1\u7684\u504f\u79fb\u91cf\uff0c\u540c\u65f6master\u8fd8\u4f1a\u628a\u540c\u6b65\u7684\u547d\u4ee4\u653e\u5728\u81ea\u5df1\u7684\u590d\u5236\u79ef\u538b\u7f13\u51b2\u533a\u4e2d\uff0c\u8fd9\u4e2a\u7f13\u51b2\u533a\u9ed8\u8ba4\u5927\u5c0f\u662f1M\uff0c\u9075\u5faaFIFO\u7684\u539f\u5219\u3002\u8fd9\u6837\u5f53slave\u65ad\u7ebf\u91cd\u8fde\u540e\u4f1a\u505a\uff1a\n<ul><li>\u628a\u81ea\u5df1\u4fdd\u5b58\u7684master\u7684run_id\u53d1\u7ed9\u5f53\u524d\u7684\u4e3b\u3002<\/li><li>\u628a\u81ea\u5df1\u7684\u504f\u79fb\u91cf\u53d1\u7ed9\u5f53\u524d\u7684\u4e3b\u3002master\u6536\u5230\u4fe1\u606f\u540e\uff0c\u9996\u5148\u786e\u8ba4slave\u53d1\u7684run_id\u662f\u81ea\u5df1\uff0c\u7136\u540e\u518d\u786e\u8ba4slave\u7684\u504f\u79fb\u91cf\u662f\u5426\u8fd8\u5728\u7f13\u51b2\u533a\u4e2d\uff0c\u5982\u679c\u8fd9\u4e24\u70b9\u90fd\u6ee1\u8db3\u7684\u8bdd\uff0c\u90a3\u4e48master\u5c31\u4f1a\u628a\u79ef\u538b\u7f13\u51b2\u533a\u4e2d\u4eceslave\u53d1\u7684\u504f\u79fb\u91cf\u4e4b\u540e\u7684\u6240\u6709\u6570\u636e\u53d1\u7ed9slave\uff0c\u5b9e\u73b0\u90e8\u5206\u540c\u6b65\u3002\u4f46\u662f\u53ea\u8981\u6709\u4e00\u70b9\u4e0d\u6ee1\u8db3\uff0c\u90a3\u4e48\u5c31\u4f1a\u6267\u884c\u5168\u90e8\u540c\u6b65\u3002<\/li><\/ul>\n<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u5982\u4f55\u89e3\u51b3redis\u8111\u88c2\u95ee\u9898<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/08\/redis6.png\" alt=\"\u89e3\u51b3redis\u8111\u88c2\u95ee\u9898\" \/><figcaption>\u89e3\u51b3redis\u8111\u88c2\u95ee\u9898<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u300c\u4ec0\u4e48\u662f\u8111\u88c2\u95ee\u9898\u300d<\/strong>\uff1a\u5728redis\u96c6\u7fa4\u4e2d\uff0c\u5982\u679c\u5b58\u5728\u4e24\u4e2amaster\u8282\u70b9\u5c31\u662f\u8111\u88c2\u95ee\u9898\uff0c\u8fd9\u65f6\u5019\u5ba2\u6237\u7aef\u8fde\u7740\u54ea\u4e2amaster\uff0c\u5c31\u5f80\u54ea\u4e2amaster\u4e0a\u5199\u6570\u636e\uff0c\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002<br>\n<strong>\u300c\u8111\u88c2\u95ee\u9898\u662f\u5982\u4f55\u4ea7\u751f\u7684\u300d<\/strong>\uff1a\u4e00\u822c\u53ef\u80fd\u662f\u7531\u4e8emaster\u6240\u5904\u7684\u7f51\u7edc\u53d1\u751f\u4e86\u95ee\u9898\uff0c\u5bfc\u81f4master\u548c\u5176\u4f59\u7684slave\u65e0\u6cd5\u6b63\u5e38\u901a\u4fe1\uff0c\u4f46\u662fmaster\u548c\u5ba2\u6237\u7aef\u7684\u901a\u4fe1\u662fok\u7684\uff0c\u8fd9\u65f6\u54e8\u5175\u4f1a\u4ece\u5269\u4e0b\u7684slave\u4e2d\u9009\u4e3e\u4e00\u4e2amaster\uff0c\u5f53\u539fmaster\u7f51\u7edc\u6062\u590d\u540e\uff0c\u5c31\u4f1a\u88ab\u964d\u7ea7\u6210slave\u3002<br>\n<strong>\u300c\u8111\u88c2\u4ea7\u751f\u7684\u5f71\u54cd\u300d<\/strong>\uff1a\u5728\u539fmaster\u5931\u8054\u7684\u671f\u95f4\uff0c\u548c\u5b83\u901a\u4fe1\u7684client\u4f1a\u628a\u53d8\u66f4\u8bb0\u5f55\u5728\u539f master \u4e2d\uff0c\u5f53\u539f master \u7f51\u7edc\u6062\u590d\u5e76\u6210\u4e3a\u65b0master\u7684slave\u7684\u65f6\u5019\uff0c\u5b83\u4f1a\u6e05\u7a7a\u81ea\u5df1\u7684\u6570\u636e\uff0c\u540c\u6b65\u65b0 master \u7684\u6570\u636e\u3002\u90a3\u4e48\u5728\u7f51\u7edc\u5931\u8054\u7684\u671f\u95f4\uff0c\u5f80\u539fmaster\u5199\u5165\u6570\u636e\u90fd\u662f\u4e22\u5931\u7684\u3002<br>\n<strong>\u300c\u5982\u4f55\u89e3\u51b3\u300d<\/strong>\uff1a\u4e3b\u8981\u901a\u8fc7\u4e24\u4e2a\u914d\u7f6e\u53c2\u6570\u6765\u89e3\u51b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>min-slaves-to-write 1\nmin-slaves-max-lag 10<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>\u300cmin-slaves-to-write\u300d<\/strong>\uff1a\u8fd9\u4e2a\u914d\u7f6e\u9879\u8bbe\u7f6e\u4e86\u4e3b\u5e93\u80fd\u8fdb\u884c\u6570\u636e\u540c\u6b65\u7684\u6700\u5c11\u4ece\u5e93\u6570\u91cf\uff1b<\/li><li><strong>\u300cmin-slaves-max-lag\u300d<\/strong>\uff1a\u8fd9\u4e2a\u914d\u7f6e\u9879\u8bbe\u7f6e\u4e86\u4e3b\u4ece\u5e93\u95f4\u8fdb\u884c\u6570\u636e\u590d\u5236\u65f6\uff0c\u4ece\u5e93\u7ed9\u4e3b\u5e93\u53d1\u9001 ACK \u6d88\u606f\u7684\u6700\u5927\u5ef6\u8fdf\uff08\u4ee5\u79d2\u4e3a\u5355\u4f4d\uff09\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e24\u4e2a\u914d\u7f6e\u90fd\u4e0d\u6ee1\u8db3\u7684\u8bdd\uff0c\u90a3\u4e48master\u5c31\u62d2\u7edd\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\uff0c\u901a\u8fc7\u4ee5\u4e0a\u914d\u7f6e\u53ef\u4ee5\u5c06\u4e22\u5931\u7684\u6570\u636e\u63a7\u5236\u572810s\u5185\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u96c6\u7fa4\u662f\u600e\u6837\u7684<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u9996\u5148\u96c6\u7fa4\u662f\u7531\u591a\u4e2a\u8282\u70b9\u7ec4\u6210\u7684\uff0c\u8282\u70b9\u901a\u8fc7\u63e1\u624b\u6765\u5c06\u5176\u4ed6\u8282\u70b9\u52a0\u5165\u5230\u81ea\u5df1\u7684\u96c6\u7fa4\u4e2d\u3002<\/li><li>\u96c6\u7fa4\u4e2d\u4e00\u5171\u6709 16384 \u4e2a\u69fd\u3002<\/li><li>\u6bcf\u4e2a\u8282\u70b9\u90fd\u4f1a\u8bb0\u5f55\u81ea\u5df1\u8d1f\u8d23\u7684\u69fd\uff0c\u548c\u5269\u4e0b\u7684\u69fd\u662f\u7531\u54ea\u4e2a\u8282\u70b9\u5904\u7406\u7684\u3002<\/li><li>\u8282\u70b9\u6536\u5230\u547d\u4ee4\u65f6\uff0c\u4f1a\u5148\u68c0\u67e5\u8fd9\u4e2a\u952e\u5426\u662f\u81ea\u5df1\u8d1f\u8d23\u7684\uff0c\u4e0d\u662f\u7684\u8bdd\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2a MOVED \u9519\u8bef\uff0c\u901a\u8fc7 MOVED \u9519\u8bef\u643a\u5e26\u7684\u4fe1\u606f\u5f15\u5bfc\u5ba2\u6237\u7aef\u8f6c\u5411\u8d1f\u8d23\u6b64\u69fd\u7684\u8282\u70b9\u3002<\/li><li>\u5982\u679c\u60f3\u8981\u91cd\u65b0\u5206\u914d\u69fd\uff0c\u90a3\u5f97\u7528 redis-trib \u5de5\u5177\u3002<\/li><li>\u91cd\u65b0\u5206\u69fd\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u8282\u70b9A\u6b63\u5728\u8fc1\u79fb\u69fd i \u5230 B \u8282\u70b9\uff0c\u90a3\u4e48\u8bf7\u6c42\u5230\u69fdi\u7684\u65f6\u5019\uff0c\u8282\u70b9 A \u4f1a\u8fd4\u56de\u4e00\u4e2a ASK \u9519\u8bef\uff0c\u5f15\u5bfc\u5ba2\u6237\u7aef\u5230\u69fd B \u53bb\u67e5\u627e\u3002<\/li><li>\u6bcf\u4e2a\u8282\u70b9\u589e\u52a0\u4ece\u8282\u70b9\uff0c\u6765\u5b9e\u73b0\u9ad8\u53ef\u7528\u3002<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">redis\u5206\u5e03\u5f0f\u9501\u4e00\u5b9a\u662f\u5b89\u5168\u7684\u5417<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u77e5\u9053 redis \u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u547d\u4ee4\u662f\u4e00\u4e2a\u4e00\u4e2a\u5904\u7406\u7684\uff0c\u6240\u4ee5\u7528 redis \u505a\u5206\u5e03\u5f0f\u9501\u662f ok \u7684\uff1f\u6700\u5e38\u7528\u7684\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>set key value PX seconds NX<\/code><\/pre>\n\n\n\n<p 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