{"id":34403,"date":"2023-07-29T10:01:02","date_gmt":"2024-03-12T03:57:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8%e4%bf%a1%e5%8f%b7%e9%87%8f%e8%a7%a3%e5%86%b3%e7%bc%93%e5%ad%98%e4%b8%ad%e7%9a%84stampede%e9%97%ae%e9%a2%98%e3%80%82\/"},"modified":"2024-04-30T15:52:49","modified_gmt":"2024-04-30T07:52:49","slug":"%e7%94%a8%e4%bf%a1%e5%8f%b7%e9%87%8f%e8%a7%a3%e5%86%b3%e7%bc%93%e5%ad%98%e4%b8%ad%e7%9a%84stampede%e9%97%ae%e9%a2%98%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8%e4%bf%a1%e5%8f%b7%e9%87%8f%e8%a7%a3%e5%86%b3%e7%bc%93%e5%ad%98%e4%b8%ad%e7%9a%84stampede%e9%97%ae%e9%a2%98%e3%80%82\/","title":{"rendered":"\u7528\u4fe1\u53f7\u91cf\u89e3\u51b3\u7f13\u5b58\u4e2d\u7684Stampede\u95ee\u9898"},"content":{"rendered":"<h2>\u7f13\u5b58\u60ca\u614c<\/h2>\n<p>\u7f13\u5b58\u8fc7\u671f\u5bfc\u81f4\u5bf9\u6e90\uff08\u4f8b\u5982\u6570\u636e\u5e93\uff09\u8bbf\u95ee\u96c6\u4e2d\uff0c\u4ece\u800c\u589e\u52a0\u4e86\u8d1f\u8f7d\u7684\u95ee\u9898\u88ab\u79f0\u4e3a\u7f13\u5b58\u51fb\u7a7f\uff08Cache Stampede\uff09\u3002&#8221;Stampede&#8221;\u4e00\u8bcd\u7684\u65e5\u8bed\u610f\u601d\u662f\u201c\u8bb8\u591a\u4eba\u6d8c\u5165\u201d\u3002<\/p>\n<p>\u8fd8\u53ef\u4ee5\u79f0\u4e4b\u4e3a\u201c\u7f13\u5b58\u672a\u547d\u4e2d\u98ce\u66b4\u201d\u3001\u201c\u96f7\u9e23\u517d\u201d\u3001\u201c\u72d7\u5806\u201d\u7b49\u4e0d\u540c\u540d\u79f0\u3002<\/p>\n<p>\u672c\u6587\u5c06\u4ecb\u7ecd\u89e3\u51b3 Cache Stampede \u95ee\u9898\u7684\u65b9\u6cd5\uff0c\u5373\u5c06 memcached \u7684\u529f\u80fd\u7528\u4f5c\u4fe1\u53f7\u91cf\uff0c\u6765\u63a7\u5236\u5bf9\u539f\u59cb\u6570\u636e\u7684\u8bbf\u95ee\u3002<\/p>\n<hr \/>\n<p>\u4e3a\u4e86\u6574\u7406\u95ee\u9898\uff0c\u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\u4f7f\u7528\u7f13\u5b58\u7684\u5178\u578b\u5904\u7406\u65b9\u5f0f\u3002<\/p>\n<h2>\u7b80\u5355\u7684\u73b0\u91d1<\/h2>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u7f13\u5b58\u5177\u6709\u6709\u6548\u671f\u9650\u3002\u5f53\u7f13\u5b58\u8fc7\u671f\u65f6\uff0c\u5c06\u4e0d\u4f7f\u7528\u7f13\u5b58\uff0c\u800c\u662f\u8bbf\u95ee\u6e90\uff08\u5982\u6570\u636e\u5e93\uff09\u83b7\u53d6\u65b0\u7ed3\u679c\uff0c\u5e76\u5c06\u5176\u4fdd\u5b58\u5230\u7f13\u5b58\uff0c\u5e76\u8fd4\u56de\u54cd\u5e94\u3002<\/p>\n<p>\u5927\u81f4\u4e0a\u7684\u5b9e\u65bd\u5c06\u5982\u4e0b\u6240\u8ff0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\"># \u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\r\n<\/span><span class=\"n\">data<\/span> <span class=\"o\">=<\/span> <span class=\"n\">get_cache<\/span><span class=\"p\">(<\/span><span class=\"n\">key<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">if<\/span> <span class=\"ow\">not<\/span> <span class=\"n\">data<\/span><span class=\"p\">:<\/span>\r\n  <span class=\"c1\"># \u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u306a\u3051\u308c\u3070\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304b\u3089\u53d6\u5f97\u3059\u308b\r\n<\/span>  <span class=\"n\">data<\/span> <span class=\"o\">=<\/span> <span class=\"n\">get_data_from_database<\/span><span class=\"p\">(...)<\/span>\r\n\r\n  <span class=\"c1\"># \u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u4fdd\u5b58\u3059\u308b\r\n<\/span>  <span class=\"n\">set_cache<\/span><span class=\"p\">(<\/span><span class=\"n\">key<\/span><span class=\"p\">,<\/span> <span class=\"n\">data<\/span><span class=\"p\">,<\/span> <span class=\"n\">ttl<\/span><span class=\"o\">=<\/span><span class=\"mi\">60<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c1\"># \u30e6\u30fc\u30b6\u30fc\u306b\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u8fd4\u3059\r\n<\/span><span class=\"n\">send_response<\/span><span class=\"p\">(<\/span><span class=\"n\">data<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h3>\u5982\u679c\u8bbf\u95ee\u91cf\u5f88\u5c11<\/h3>\n<p>\u5982\u679c\u8bbf\u95ee\u91cf\u8f83\u5c11\uff0c\u8fd9\u4e0d\u662f\u4e2a\u95ee\u9898\u3002\u56e0\u4e3a\u5982\u4e0b\u6240\u8ff0\uff0c\u8bbf\u95ee\u5230\u6e90\u7ad9\u7684\u6d41\u91cf\u5f88\u5c11\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d1d2c37434c4406c12a93\/13-0.png\" alt=\"Normal.png\" \/><\/div>\n<h3>\u5f53\u8bbf\u95ee\u91cf\u8f83\u5927\u65f6<\/h3>\n<p>\u5982\u679c\u6709\u5927\u91cf\u8bbf\u95ee\uff0c\u5e76\u4e14\u7f13\u5b58\u8fc7\u671f\u4e86\uff0c\u90a3\u4e48\u4f1a\u6709\u591a\u6b21\u8bbf\u95ee\u53bb\u6570\u636e\u5e93\u3002\u8fd9\u662f\u56e0\u4e3a\u7f13\u5b58\u8fc7\u671f\u548c\u65b0\u7f13\u5b58\u4fdd\u5b58\u4e4b\u95f4\u5b58\u5728\u65f6\u95f4\u5dee\u3002\u5982\u679c\u6570\u636e\u5e93\u5904\u7406\u8f83\u6162\uff0c\u90a3\u4e48\u5728\u7f13\u5b58\u8fc7\u671f\u7684\u65f6\u5019\u4f1a\u589e\u52a0\u8d1f\u8f7d\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d1d2c37434c4406c12a93\/16-0.png\" alt=\"Stampede.png\" \/><\/div>\n<h2>\u5e94\u5bf9\u63aa\u65bd<\/h2>\n<p>\u5728\u5e94\u5bf9\u63aa\u65bd\u4e2d\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4f9b\u9009\u62e9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ed\u30c3\u30af<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5225\u30d7\u30ed\u30bb\u30b9\u3067\u306e\u66f4\u65b0<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u78ba\u7387\u7684\u306a\u65e9\u671f\u306e\u671f\u9650\u5207\u308c<\/ul>\n<p>\u672c\u6587\u5c06\u4ecb\u7ecd\u4f7f\u7528\u4e00\u79cd\u540d\u4e3a\u4fe1\u53f7\u91cf\u7684\u9501\u6765\u89e3\u51b3\u95ee\u9898\u7684\u65b9\u6cd5\u3002<\/p>\n<h3>\u53ea\u66f4\u65b0\u4e00\u6b21<\/h3>\n<p>\u5f53\u7f13\u5b58\u5931\u6548\u65f6\uff0c\u53ea\u9700\u4e00\u4e2a\u7528\u6237\u8bbf\u95ee\u6570\u636e\u5e93\u5e76\u521b\u5efa\u65b0\u7684\u7f13\u5b58\uff0c\u5176\u4ed6\u7528\u6237\u5219\u7b49\u5f85\u65b0\u7f13\u5b58\u5373\u53ef\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u8f7b\u5bf9\u539f\u59cb\u6570\u636e\u7684\u8d1f\u8f7d\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d1d2c37434c4406c12a93\/23-0.png\" alt=\"Smart.png\" \/><\/div>\n<h3>\u4fe1\u53f7\u706f<\/h3>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u4fe1\u53f7\u91cf\u6765\u63a7\u5236\u8bbf\u95ee\u4ee5\u5b9e\u73b0\u3002<\/p>\n<p>\u4ec0\u4e48\u662f\u4fe1\u53f7\u91cf\uff1f<\/p>\n<blockquote><p>\u7528\u4e8e\u63a7\u5236\u591a\u4e2a\u6267\u884c\u5355\u5143\u5bf9&#8221;\u5171\u4eab\u8d44\u6e90&#8221;\u7684\u8bbf\u95ee\u3002\u67d0\u4e2a\u8d44\u6e90\u662f\u4e00\u4e2a\u8bb0\u5f55&#8221;\u53ef\u7528\u6570\u91cf&#8221;\u7684\u8bb0\u5f55\uff0c\u5728\u4f7f\u7528\u6216\u91ca\u653e\u65f6\uff0c\u8bb0\u5f55\u4f1a\u88ab&#8221;\u5b89\u5168\u5730\u91cd\u5199&#8221;\uff0c\u4e0e\u7b49\u5f85\u8d44\u6e90\u53ef\u7528\u7684\u64cd\u4f5c\u76f8\u7ed3\u5408\u3002<\/p><\/blockquote>\n<p>\u7136\u800c\uff0c\u5728Web\u670d\u52a1\u4e2d\uff0c\u5e94\u7528\u7a0b\u5e8f\u5728\u591a\u53f0\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\u3002\u5373\u4f7f\u5728\u540c\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\uff0c\u4e5f\u53ef\u80fd\u901a\u8fc7\u591a\u4e2a\u8fdb\u7a0b\u8fd0\u884c\u3002\u56e0\u6b64\uff0c\u7531\u4e8e\u6bcf\u4e2a\u8bbf\u95ee\u4e0d\u662f\u5728\u540c\u4e00\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u7a0b\u4e0a\u8fdb\u884c\uff0c\u6240\u4ee5\u65e0\u6cd5\u4f7f\u7528\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u7684\uff08\u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\uff09\u4fe1\u53f7\u91cf\u3002<\/p>\n<p>\u5728\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b9e\u73b0\u4e00\u4e2a\u201c\u7f13\u5b58\u7cfb\u7edf\u201d\u6765\u5b9e\u73b0\u4ece\u6bcf\u4e2a\u8bbf\u95ee\u4e2d\u5171\u4eab\u4f7f\u7528\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5728\u8fd9\u91cc\u5f15\u5165\u4fe1\u53f7\u91cf\u3002<\/p>\n<h3>\u6dfb\u52a0<\/h3>\n<p>memcached\u7684add\u547d\u4ee4\u53ea\u5728\u201c\u9879\u4e0d\u5b58\u5728\u65f6\u4fdd\u5b58\u201d\u6570\u636e\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u53ea\u6709\u5355\u4e2a\u5ba2\u6237\u7aef\u80fd\u591f\u4fdd\u5b58\u6570\u636e\u5230\u8be5\u952e\u3002<\/p>\n<p>\u901a\u8fc7\u5c06\u6dfb\u52a0\u6210\u529f\u89c6\u4e3a\u201c\u83b7\u53d6\u4fe1\u53f7\u91cf\u201d\uff0c\u53ef\u4ee5\u4f7f\u5355\u4e2a\u5ba2\u6237\u7aef\u6267\u884c\u7f13\u5b58\u66f4\u65b0\u3002<\/p>\n<h3>\uff1a\u8fd9\u662f\u4e00\u4e2a\u7406\u89e3\u548c\u8fd0\u7528\u4e2d\u6587\u7684\u673a\u4f1a\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"c1\"># \u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\r\n<\/span><span class=\"n\">data<\/span> <span class=\"o\">=<\/span> <span class=\"n\">memcache<\/span><span class=\"p\">.<\/span><span class=\"n\">get<\/span><span class=\"p\">(<\/span><span class=\"n\">key_for_data<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">if<\/span> <span class=\"n\">data<\/span><span class=\"p\">:<\/span>\r\n  <span class=\"c1\"># \u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u3042\u308b\u5834\u5408\u306f\u30bb\u30de\u30d5\u30a9\u306e\u7372\u5f97\u3092\u8a66\u307f\u308b\r\n<\/span>  <span class=\"n\">ret<\/span> <span class=\"o\">=<\/span> <span class=\"n\">memcache<\/span><span class=\"p\">.<\/span><span class=\"n\">add<\/span><span class=\"p\">(<\/span><span class=\"n\">key_for_semaphore<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"n\">ttl<\/span><span class=\"o\">=<\/span><span class=\"mi\">60<\/span><span class=\"p\">)<\/span>\r\n\r\n  <span class=\"k\">if<\/span> <span class=\"n\">ret<\/span><span class=\"p\">:<\/span>\r\n    <span class=\"c1\"># \u30bb\u30de\u30d5\u30a9\u3092\u7372\u5f97\u3057\u305f\u5834\u5408\u306f\u65b0\u3057\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f5c\u308b\r\n<\/span>    <span class=\"n\">data<\/span> <span class=\"o\">=<\/span> <span class=\"n\">get_data_from_database<\/span><span class=\"p\">(...)<\/span>\r\n    <span class=\"n\">memcache<\/span><span class=\"p\">.<\/span><span class=\"nb\">set<\/span><span class=\"p\">(<\/span><span class=\"n\">key_for_data<\/span><span class=\"p\">,<\/span> <span class=\"n\">data<\/span><span class=\"p\">,<\/span> <span class=\"n\">ttl<\/span><span class=\"o\">=<\/span><span class=\"mi\">120<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">else<\/span><span class=\"p\">:<\/span>\r\n  <span class=\"c1\"># \u672c\u5f53\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u5207\u308c\u3057\u3066\u3057\u307e\u3063\u305f\u5834\u5408\u306f\u3001\u3069\u3046\u3057\u3088\u3046\u3082\u306a\u3044\u306e\u3067\u30aa\u30ea\u30b8\u30f3\u3078\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\r\n<\/span>  <span class=\"n\">memcache<\/span><span class=\"p\">.<\/span><span class=\"n\">add<\/span><span class=\"p\">(<\/span><span class=\"n\">key_for_semaphore<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"n\">ttl<\/span><span class=\"o\">=<\/span><span class=\"mi\">60<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"n\">data<\/span> <span class=\"o\">=<\/span> <span class=\"n\">get_data_from_database<\/span><span class=\"p\">(...)<\/span>\r\n  <span class=\"n\">memcache<\/span><span class=\"p\">.<\/span><span class=\"nb\">set<\/span><span class=\"p\">(<\/span><span class=\"n\">key_for_data<\/span><span class=\"p\">,<\/span> <span class=\"n\">data<\/span><span class=\"p\">,<\/span> <span class=\"n\">ttl<\/span><span class=\"o\">=<\/span><span class=\"mi\">120<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">return<\/span> <span class=\"n\">data<\/span>\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u53ea\u6709\u4e00\u4e2a\u4eba\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u56e0\u6b64\u5bf9Origin\u7684\u8bbf\u95ee\u901a\u5e38\u53ea\u9650\u4e8e\u4e00\u4e2a\u4eba\u3002<\/p>\n<h3>\u5230\u671f\u65e5<\/h3>\n<p>\u5728memcache\u4e2d\u53ef\u4ee5\u8bbe\u7f6e\u9879\u76ee\u7684\u8fc7\u671f\u65f6\u95f4\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u901a\u8fc7\u8fc7\u671f\u65f6\u95f4\u6765\u91ca\u653e\u4fe1\u53f7\u91cf\u3002\u5728Web\u670d\u52a1\u4e2d\uff0cHTTP\u8bf7\u6c42\u7684\u5904\u7406\u662f\u7acb\u5373\u8fd4\u56de\u7684\uff0c\u65e0\u6cd5\u663e\u5f0f\u5730\u91ca\u653e\u4fe1\u53f7\u91cf\u3002\u4f46\u662f\u7531\u4e8e\u9879\u76ee\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u5b83\u4eec\u4f1a\u81ea\u52a8\u91ca\u653e\uff0c\u4e0d\u4f1a\u5fd8\u8bb0\u91ca\u653e\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u4fe1\u53f7\u91cf\u7684\u6709\u6548\u671f\u9650\u5e94\u8be5\u6bd4\u6570\u636e\u7684\u6709\u6548\u671f\u9650\u77ed\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u5728\u7f13\u5b58\u6570\u636e\u4ecd\u7136\u5b58\u5728\u65f6\u89e6\u53d1\u5bf9\u6e90\u7ad9\u7684\u8bbf\u95ee\u548c\u65b0\u7f13\u5b58\u7684\u521b\u5efa\uff0c\u5e76\u4e14\u672a\u83b7\u5f97\u4fe1\u53f7\u91cf\u7684\u5ba2\u6237\u7aef\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u7f13\u5b58\u6570\u636e\u3002<\/p>\n<p>\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0ckey_for_semaphore\u4f1a\u5728\u6570\u636e\u4e4b\u524d\u8fc7\u671f\uff08ttl=60\uff09\u3002\u5c3d\u7ba1\u4ecememcache.get\u4e2d\u53ef\u4ee5\u83b7\u5f97\u6570\u636e\uff0c\u4f46\u662f\u6700\u5f00\u59cb\u6210\u529f\u8c03\u7528memcache.add\u5e76\u8bbf\u95ee\u6e90\u670d\u52a1\u5668\u7684\u5ba2\u6237\u7aef\u4f1a\u4f7f\u7528memcache.set\u6765\u5b58\u50a8\u65b0\u6570\u636e\uff08ttl=120\uff09\u3002\u5f53\u7136\uff0c\u7f13\u5b58\u4e5f\u6709\u53ef\u80fd\u56e0\u4e3a\u9664\u4e86\u6709\u6548\u671f\u7684\u5176\u4ed6\u539f\u56e0\u800c\u6d88\u5931\uff0c\u6240\u4ee5\u53ef\u80fd\u4f1a\u8fdb\u5165else\u90e8\u5206\uff0c\u4f46\u603b\u4f53\u4e0a\u6211\u8ba4\u4e3a\u5b83\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n<h2>\u5176\u4ed6<\/h2>\n<p>\u4ee5\u4e0b\u662f\u5404\u79cd\u8f6f\u4ef6\u5728Stampede\u653b\u51fb\u9632\u8303\u65b9\u9762\u7684\u529f\u80fd\uff1a<\/p>\n<p>&#8211; Rails\u7684ActiveSupport::Cache::Store\u7ade\u6001\u6761\u4ef6\u8d85\u65f6\u8bbe\u7f6e\uff08race_condition_ttl\uff09<br \/>\n&#8211; nginx\u7684proxy_cache_lock\u529f\u80fd<br \/>\n&#8211; Varnish\u7684Grace\u6a21\u5f0f<br \/>\n&#8211; Fastly\u529f\u80fd<\/p>\n<p>\u8bf7\u53c2\u8003\u4ee5\u4e0b\u94fe\u63a5\uff1a<br \/>\n&#8211; http:\/\/techblog.yahoo.co.jp\/infrastructure\/cache-reducing-origin-request\/<br \/>\n&#8211; https:\/\/en.wikipedia.org\/wiki\/Cache_stampede<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7f13\u5b58\u60ca\u614c \u7f13\u5b58\u8fc7\u671f\u5bfc\u81f4\u5bf9\u6e90\uff08\u4f8b\u5982\u6570\u636e\u5e93\uff09\u8bbf\u95ee\u96c6\u4e2d\uff0c\u4ece\u800c\u589e\u52a0\u4e86\u8d1f\u8f7d\u7684\u95ee\u9898\u88ab\u79f0\u4e3a\u7f13\u5b58\u51fb\u7a7f\uff08Cache Stampe 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