{"id":120894,"date":"2026-11-01T18:48:42","date_gmt":"2026-11-01T10:48:42","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/120894.html"},"modified":"2026-11-01T18:48:42","modified_gmt":"2026-11-01T10:48:42","slug":"java-%e5%ae%9e%e7%8e%b0%e4%b8%80%e8%87%b4%e6%80%a7%e5%93%88%e5%b8%8c%e5%ae%9e%e6%b5%8b%ef%bc%9a40-%e4%b8%87%e9%94%ae%e4%b8%8b%e7%9a%84-90-9-%e5%a2%9e%e5%91%98%e8%bf%81%e7%a7%bb%e3%80%814194-%e4%b8%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/120894.html","title":{"rendered":"Java \u5b9e\u73b0\u4e00\u81f4\u6027\u54c8\u5e0c\u5b9e\u6d4b\uff1a40 \u4e07\u952e\u4e0b\u7684 90.9% \u589e\u5458\u8fc1\u79fb\u30014194 \u4e07\u70b9\u4f4d\u7406\u8bba\u5931\u51c6\u4e0e 9.5 \u500d\u73af\u5185\u5b58\u5dee"},"content":{"rendered":"

\u5206\u5e03\u5f0f<\/p>\n

\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898：\u628a\u300c\u4e00\u81f4\u6027\u54c8\u5e0c\u300d\u8fd9\u4e2a\u8bcd\u540e\u9762\u85cf\u7740\u7684\u4e09\u4e2a\u5de5\u7a0b\u51b3\u7b56\u2014\u2014\u8981\u4e0d\u8981\u73af\u3001\u6bcf\u8282\u70b9\u94fa\u591a\u5c11\u4e2a\u865a\u62df\u70b9\u4f4d\u3001\u70b9\u4f4d\u5728\u5185\u5b58\u91cc\u600e\u4e48\u653e\u2014\u2014\u53d8\u6210\u516d\u4e2a\u53ef\u4ee5\u81ea\u5df1\u590d\u8dd1\u7684\u6570\u5b57：\u6210\u5458\u53d8\u66f4\u8fc1\u79fb\u7387\u3001CV \u7406\u8bba\u5bf9\u62cd\u3001\u78b0\u649e\u5931\u51c6\u70b9\u3001\u6bcf\u70b9\u4f4d\u5b57\u8282\u3001\u67e5\u627e\u5206\u4f4d\u4e0e\u6784\u5efa\u8017\u65f6，\u5916\u52a0\u4e24\u4e2a\u5b9e\u9a8c\u53f0\u8fd4\u5de5\u7684\u5b8c\u6574\u56e0\u679c\u94fe\u3002<\/p>\n

\u9002\u5408\u8c01\u8bfb：\u7ef4\u62a4\u6216\u6b63\u8981\u7ef4\u62a4\u5206\u7247\u8def\u7531\u3001\u7f13\u5b58\u96c6\u7fa4\u3001\u8d1f\u8f7d\u5747\u8861\u8868\u7684 Java \u540e\u7aef；\u88ab\u95ee\u5230\u300c\u865a\u62df\u8282\u70b9\u4e3a\u4ec0\u4e48\u662f 160\u300d\u53ea\u4f1a\u80cc\u5b9a\u4e49\u7684\u4eba；\u4ee5\u53ca\u4efb\u4f55\u51c6\u5907\u5bf9\u300c\u663e\u7136\u6b63\u786e\u300d\u7684\u9ed8\u8ba4\u53c2\u6570\u52a8\u624b\u4e4b\u524d，\u60f3\u77e5\u9053\u600e\u4e48\u5148\u7b97\u4e00\u7b14\u8d26\u7684\u4eba\u3002<\/p>\n

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\u628a\u65f6\u95f4\u951a\u4e00\u4e0b：2026 \u5e74 9 \u6708 18 \u65e5，Cloudflare \u53d1\u5e03\u590d\u76d8，\u5de5\u7a0b\u5e08\u4ece\u4e00\u5f20\u300cpingora-ketama \u5185\u5b58\u5360\u7528\u5f02\u5e38\u300d\u7684\u5de5\u5355\u51fa\u53d1，\u6700\u7ec8\u4ece\u5168\u7403\u8d1f\u8f7d\u5747\u8861\u670d\u52a1\u91cc\u56de\u6536\u4e86\u8d85\u8fc7 100TB \u5185\u5b58；\u590d\u76d8\u91cc\u7684\u5173\u952e\u4e8b\u5b9e\u5305\u62ec：\u6bcf\u670d\u52a1\u5668\u9ed8\u8ba4 160 \u4e2a\u54c8\u5e0c\u70b9（\u627f\u81ea NGINX ketama）\u3001\u8d1f\u8f7d\u6ce2\u52a8\u7387\u968f\u70b9\u4f4d\u6570\u6309\u5e73\u65b9\u6839\u8870\u51cf\u3001\u56e2\u961f\u636e\u6b64\u628a\u6bcf\u53f0\u670d\u52a1\u5668\u7684\u54c8\u5e0c\u6570\u91cf\u780d\u6389\u7ea6 90%\u3001\u5e76\u628a\u6bcf\u4e2a\u70b9\u4f4d\u4ece 8 \u5b57\u8282\u624b\u5de5\u6253\u5305\u538b\u5230 6 \u5b57\u8282\u2014\u2014\u4ee5\u4e0a\u4e3a Cloudflare \u5b98\u65b9\u535a\u5ba2\u5185\u5bb9，\u6211\u7ecf InfoQ 10 \u6708\u5e95\u8d8b\u52bf\u699c\u6536\u5f55\u4e0e\u7f51\u6613\u79d1\u6280 10 \u6708 24 \u65e5\u4e2d\u6587\u8f6c\u8ff0\u6838\u5b9e，\u539f\u6587\u7ec6\u8282\u4ee5\u5b98\u65b9\u535a\u5ba2\u4e3a\u51c6\u300210 \u6708\u6700\u540e\u4e24\u5929，\u8fd9\u7bc7\u590d\u76d8\u548c DNS \u7f13\u5b58\u7701\u4e0b\u53e6\u4e00\u4e2a 100TB \u7684\u6587\u7ae0\u8fd8\u540c\u65f6\u6302\u5728 InfoQ \u70ed\u95e8\u699c\u4e0a\u2014\u2014\u4e00\u81f4\u6027\u54c8\u5e0c\u5728\u8d85\u5927\u89c4\u6a21\u4e0b\u7684\u771f\u5b9e\u6210\u672c，\u4ecd\u662f\u8fd9\u4e2a\u6708\u5de5\u7a0b\u5e08\u4eec\u4e89\u8bba\u7684\u8bdd\u9898\u3002<\/p>\n

\u4e89\u8bba\u91cc\u6700\u5e38\u51fa\u73b0\u7684\u4e00\u53e5\u662f\u300c\u4e00\u81f4\u6027\u54c8\u5e0c\u5230\u5e95\u8d35\u5728\u54ea\u3001\u503c\u4e0d\u503c\u300d\u3002\u4e0e\u5176\u8f6c\u8ff0，\u6211\u51b3\u5b9a\u5728\u672c\u673a\u628a\u5b83\u62c6\u5f00\u91cf\u4e00\u904d：40 \u4e07\u4e2a\u952e\u30013\/10\/30 \u4e09\u7ec4\u96c6\u7fa4\u89c4\u6a21\u3001\u6bcf\u8282\u70b9 1 \u5230 81920 \u4e2a\u70b9\u4f4d\u3001\u4e09\u79cd\u5185\u5b58\u5f62\u6001，\u5168\u90e8\u4ea4\u7ed9\u4e00\u4e2a\u81ea\u5305\u542b\u7684\u7eaf JDK \u7a0b\u5e8f\u8dd1\u51fa\u6765\u3002\u4e0b\u9762\u6240\u6709\u6570\u5b57\u90fd\u662f\u8fd9\u53f0 Windows 11 \u673a\u5668\u4e0a\u771f\u5b9e\u8fd0\u884c\u7684\u8f93\u51fa，\u4e09\u6b21\u590d\u8dd1\u7684\u7edf\u8ba1\u5217\u9010\u4f4d\u4e00\u81f4；\u5148\u9489\u73af\u5883\u53e3\u5f84\u3002<\/p>\n

\u4e00\u3001\u5148\u628a\u73af\u5883\u53e3\u5f84\u9489\u6b7b：\u6240\u6709\u6570\u5b57\u90fd\u4ece\u8fd9\u53f0\u673a\u5668\u4e0a\u6765<\/h3>\n

\u5148\u8bf4\u6e05\u695a\u8fd9\u7bc7\u7684\u5b9e\u9a8c\u53e3\u5f84，\u514d\u5f97\u4f60\u62ff\u81ea\u5df1\u73af\u5883\u5bf9\u4e0d\u4e0a\u6765\u8d28\u7591\u7ed3\u8bba\u3002\u6240\u6709\u6570\u636e\u6765\u81ea\u6211\u672c\u673a\u4e00\u6b21\u7eaf JDK \u5b9e\u9a8c（\u5355\u6587\u4ef6，\u65e0\u4efb\u4f55\u7b2c\u4e09\u65b9\u4f9d\u8d56），\u7a0b\u5e8f\u81ea\u5df1\u6253\u5370\u73af\u5883\u4e0e\u7ed3\u679c，\u4e09\u6b21\u590d\u8dd1\u7684\u7edf\u8ba1\u5217\u9010\u4f4d\u4e00\u81f4\u3002\u547d\u4ee4\u4e0e\u5224\u5b9a\u6807\u51c6\u5728\u7b2c\u4e5d\u8282\u7ed9\u5168\u3002<\/p>\n\n\u9879\u76ee\u672c\u673a\u5b9e\u91c7\u503c<\/tr>\n\n\n\n\n\n\n\n\n\n
java -version<\/td>\n17.0.18（build 17.0.18+8-LTS-264）<\/td>\n<\/tr>\n
javac -version<\/td>\n17.0.18<\/td>\n<\/tr>\n
os.name \/ os.version<\/td>\nWindows 11 \/ 10.0<\/td>\n<\/tr>\n
os.arch<\/td>\namd64<\/td>\n<\/tr>\n
file.encoding（\u9ed8\u8ba4\u503c）<\/td>\nGBK（\u5b9e\u9a8c\u8f93\u51fa\u4e3a\u7eaf ASCII，\u672a\u53d7\u5f71\u54cd）<\/td>\n<\/tr>\n
CPU \/ JVM \u53c2\u6570<\/td>\n16 \u903b\u8f91\u6838 \/ -Xms2g -Xmx4g<\/td>\n<\/tr>\n
\u952e\u7a7a\u95f4<\/td>\ncache:item:0 .. cache:item:399999（40 \u4e07\u952e，\u56fa\u5b9a）<\/td>\n<\/tr>\n
\u70b9\u4f4d\u54c8\u5e0c<\/td>\nMD5 \u524d 4 \u5b57\u8282\u6309\u5927\u7aef\u53d6 32 \u4f4d（ketama \u540c\u6b3e\u505a\u6cd5），\u8282\u70b9\u70b9\u4f4d\u540d\u4e3a\u300c\u8282\u70b9\u540d-i\u300d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u54ea\u4e9b\u6570\u5b57\u6362\u73af\u5883\u4f1a\u53d8：\u7b2c\u4e5d\u8282\u5224\u5b9a\u6807\u51c6\u91cc，P1 \u7684\u8fc1\u79fb\u7387\u3001P2\/P3 \u7684\u6ce2\u52a8\u7387\u4e0e\u78b0\u649e\u6570\u3001P4 \u7684\u6bcf\u70b9\u5b57\u8282\u6570\u7531\u786e\u5b9a\u6027\u7b97\u6cd5\u52a0\u56fa\u5b9a\u952e\u7a7a\u95f4\u51b3\u5b9a，\u5e94\u5f53\u9010\u4f4d\u590d\u73b0；P4 \u7684\u6beb\u79d2\u4e0e\u7eb3\u79d2\u5217\u662f\u672c\u673a\u6027\u80fd\u91c7\u6837，\u6362\u4efb\u4f55\u673a\u5668\u90fd\u4f1a\u53d8，\u53ea\u770b\u91cf\u7ea7\u3002\u4e0b\u9762\u8fdb\u5165\u6b63\u9898\u3002<\/p>\n

\u4e8c\u3001\u95ee\u9898\u5b9a\u4e49：\u6269\u5bb9\u90a3\u5929，\u4f60\u7684\u7f13\u5b58\u952e\u6709\u591a\u5c11\u8981\u642c\u5bb6<\/h3>\n

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\u8861\u91cf\u5b83\u4eec\u7684\u6307\u6807\u662f\u8fc1\u79fb\u7387：\u6210\u5458\u53d8\u66f4（\u6269\u5bb9\u4e00\u4e2a\u8282\u70b9\u3001\u6458\u9664\u4e00\u4e2a\u8282\u70b9）\u524d\u540e，owner \u53d1\u751f\u53d8\u5316\u7684\u952e\u7684\u5360\u6bd4\u3002\u5b83\u4e3a\u4ec0\u4e48\u503c\u8fd9\u4e48\u591a\u94b1：\u7f13\u5b58\u573a\u666f\u91cc，\u8fc1\u79fb\u7387 90% \u610f\u5473\u7740\u4e00\u6b21\u6269\u5bb9\u7b49\u4e8e\u5168\u91cf\u56de\u6e90，\u6e90\u7ad9\u6d41\u91cf\u77ac\u95f4\u653e\u5927\u4e00\u4e2a\u6570\u91cf\u7ea7；\u4f1a\u8bdd\u7c98\u6ede\u573a\u666f\u91cc，\u7b49\u4e8e\u5168\u91cf\u7528\u6237\u88ab\u8e22\u4e0b\u7ebf\u91cd\u767b\u3002<\/p>\n

\u53d6\u6a21\u5206\u7247\u6709\u4e2a\u53cd\u76f4\u89c9\u7684\u6570\u5b66\u4e8b\u5b9e\u3002\u52a0\u4e00\u4e2a\u8282\u70b9（N \u53d8 N+1）\u65f6，\u4e00\u4e2a\u952e\u80fd\u7559\u4e0b\u7684\u6761\u4ef6\u662f h % (N+1) == h % N，\u4e5f\u5c31\u662f h \u6a21 N(N+1) \u7684\u4f59\u6570\u6070\u597d\u5c0f\u4e8e N，\u6982\u7387\u53ea\u6709 1\/(N+1)\u2014\u2014N=10 \u65f6\u4e5d\u6210\u7684\u952e\u90fd\u8981\u642c\u5bb6\u3002\u6458\u9664\u4e2d\u95f4\u8282\u70b9\u66f4\u7cdf：\u591a\u6570\u5b9e\u73b0\u91cc\u8282\u70b9\u6309\u6570\u7ec4\u4e0b\u6807\u7f16\u53f7，\u6458\u6389\u4e00\u4e2a，\u540e\u9762\u6240\u6709\u8282\u70b9\u7684\u7f16\u53f7\u6574\u4f53\u524d\u79fb，\u7b49\u4ef7\u4e8e\u4e00\u6b21\u5168\u91cf\u91cd\u6620\u5c04\u3002\u8fd9\u4e24\u6761\u63a8\u5bfc，\u7b2c\u4e09\u8282\u7528 40 \u4e07\u4e2a\u771f\u5b9e\u7684\u952e\u9a8c\u8bc1\u3002<\/p>\n

\u4e09\u300140 \u4e07\u952e\u5b9e\u6d4b：\u53d6\u6a21\u5206\u7247\u52a0\u5220\u90fd\u8981\u642c\u4e5d\u6210，\u73af\u628a\u5b83\u538b\u56de 1\/N<\/h3>\n

\u5b9e\u9a8c\u8bbe\u8ba1：40 \u4e07\u4e2a\u952e\u5206\u522b\u7528\u53d6\u6a21\u5206\u7247\u548c 160 \u70b9\u4f4d\u7684\u4e00\u81f4\u6027\u73af\u5206\u914d，\u57fa\u7ebf\u96c6\u7fa4 N \u2208 {3, 10, 30}，\u7136\u540e\u5404\u505a\u4e00\u6b21\u300c\u8ffd\u52a0 node-N\u300d\u548c\u300c\u6458\u9664\u4e2d\u95f4\u90a3\u4e2a\u8282\u70b9\u300d，\u7edf\u8ba1 owner \u53d8\u5316\u7684\u952e\u6570\u3002\u73af\u7684\u67e5\u627e\u6b63\u786e\u6027\u5148\u7528\u7ebf\u6027\u626b\u63cf\u9010\u952e\u5bf9\u62cd（10000\/10000 \u4e00\u81f4）\u624d\u5f00\u8dd1\u3002<\/p>\n\n\u8282\u70b9\u6570 N\u64cd\u4f5c\u53d6\u6a21\u5206\u7247\u8fc1\u79fb\u7387\u4e00\u81f4\u6027\u73af\u8fc1\u79fb\u7387（160 \u70b9\u4f4d）<\/tr>\n\n\n\n\n\n\n\n
3<\/td>\n\u52a0 1 \u8282\u70b9<\/td>\n74.98%<\/td>\n23.60%<\/td>\n<\/tr>\n
3<\/td>\n\u6458 1 \u8282\u70b9<\/td>\n66.75%<\/td>\n36.28%<\/td>\n<\/tr>\n
10<\/td>\n\u52a0 1 \u8282\u70b9<\/td>\n90.92%<\/td>\n9.34%<\/td>\n<\/tr>\n
10<\/td>\n\u6458 1 \u8282\u70b9<\/td>\n90.01%<\/td>\n9.53%<\/td>\n<\/tr>\n
30<\/td>\n\u52a0 1 \u8282\u70b9<\/td>\n96.79%<\/td>\n3.31%<\/td>\n<\/tr>\n
30<\/td>\n\u6458 1 \u8282\u70b9<\/td>\n96.67%<\/td>\n3.79%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e24\u4e2a\u503c\u5f97\u505c\u4e00\u505c\u7684\u5730\u65b9\u3002\u7b2c\u4e00，\u53d6\u6a21\u5206\u7247\u52a0\u548c\u6458\u90fd\u8981\u642c\u4e5d\u6210\u5de6\u53f3\u2014\u2014\u300c\u6458\u4e00\u4e2a\u53ea\u642c 1\/N\u300d\u7684\u76f4\u89c9\u5bf9\u53d6\u6a21\u5206\u7247\u4e0d\u6210\u7acb，\u56e0\u4e3a\u6458\u9664\u5bfc\u81f4\u4e0b\u6807\u91cd\u6392，\u8fd9\u5728 10 \u8282\u70b9\u65f6\u662f 90.01% \u7684\u5b9e\u6d4b\u8fc1\u79fb\u3002\u7b2c\u4e8c，\u73af\u7684\u4e24\u4e2a\u65b9\u5411\u90fd\u843d\u5728 1\/N \u9644\u8fd1：N=10 \u52a0\u8282\u70b9\u8fc1 9.34%（\u7406\u8bba 1\/11 = 9.09%），\u6458\u8282\u70b9\u8fc1 9.53%（\u88ab\u6458\u8282\u70b9\u7684\u5b9e\u9645\u4efd\u989d，\u7406\u8bba 1\/10，\u504f\u5dee\u6765\u81ea\u8282\u70b9\u4efd\u989d\u672c\u8eab\u7684 \u00b18% \u6ce2\u52a8）\u3002N=3 \u65f6\u73af\u6458\u8282\u70b9\u8fc1 36.28% \u800c\u4e0d\u662f 33.3%，\u540c\u6837\u662f\u4efd\u989d\u6ce2\u52a8，\u4e0d\u662f\u8bef\u5dee\u3002<\/p>\n

\u6240\u4ee5\u7b2c\u4e00\u6761\u53ef\u5e26\u8d70\u7684\u5224\u65ad\u5728\u8fd9\u91cc\u5c31\u6210\u7acb\u4e86：\u6269\u5bb9\u6210\u672c\u662f\u67b6\u6784\u9009\u51fa\u6765\u7684，\u4e0d\u662f\u8c03\u51fa\u6765\u7684\u3002\u952e\u5230\u8282\u70b9\u4e4b\u95f4\u9694\u4e0d\u9694\u4e00\u4e2a\u73af，\u51b3\u5b9a\u4e86\u90a3\u5929\u665a\u4e0a\u662f\u642c 9% \u8fd8\u662f\u642c 90%\u3002<\/p>\n

\u56db\u3001160 \u8fd9\u4e2a\u9ed8\u8ba4\u503c\u4e0d\u662f\u7384\u5b66：CV \u7406\u8bba\u66f2\u7ebf\u4e0e\u5b9e\u6d4b\u9010\u70b9\u5bf9\u62cd<\/h3>\n

\u73af\u7684\u5747\u8861\u5ea6\u7528\u53d8\u5f02\u7cfb\u6570 CV（\u5404\u8282\u70b9\u4efd\u989d\u7684\u6807\u51c6\u5dee\u9664\u4ee5\u5747\u503c）\u5ea6\u91cf\u3002\u4efd\u989d\u600e\u4e48\u7b97：\u628a\u6392\u5e8f\u540e\u7684\u73af\u770b\u6210\u4e00\u7ec4\u9996\u5c3e\u76f8\u63a5\u7684\u533a\u95f4，\u6bcf\u4e2a\u8282\u70b9\u5206\u5230\u7684\u533a\u95f4\u603b\u957f\u9664\u4ee5 2^32 \u5c31\u662f\u5b83\u7684\u4efd\u989d\u2014\u2014\u952e\u5747\u5300\u65f6\u8fd9\u5c31\u662f\u5b83\u7684\u6d41\u91cf\u5360\u6bd4\u3002Cloudflare \u5728 2026-09-18 \u7684\u590d\u76d8\u91cc\u7ed9\u51fa\u8fc7\u6bcf\u8282\u70b9 k \u4e2a\u70b9\u4f4d\u7684 CV \u7cbe\u786e\u8868\u8fbe\u5f0f CV_k = sqrt((N-1)\/(N\u00b7k+1))，\u6211\u6309\u8fd9\u4e2a\u516c\u5f0f\u5728\u672c\u673a\u9010\u70b9\u5bf9\u62cd：<\/p>\n\nk（\u70b9\u4f4d\/\u8282\u70b9）\u603b\u70b9\u4f4dCV \u7406\u8bbaCV \u5b9e\u6d4b\u5b9e\u6d4b\/\u7406\u8bba\u6700\u5bcc\u8282\u70b9\/\u5747\u503c32 \u4f4d\u78b0\u649e\u6570<\/tr>\n\n\n\n\n\n\n\n\n\n\n
1<\/td>\n100<\/td>\n99.01%<\/td>\n99.67%<\/td>\n1.01<\/td>\n7.12<\/td>\n0<\/td>\n<\/tr>\n
4<\/td>\n400<\/td>\n49.69%<\/td>\n44.58%<\/td>\n0.90<\/td>\n2.42<\/td>\n0<\/td>\n<\/tr>\n
16<\/td>\n1,600<\/td>\n24.87%<\/td>\n24.80%<\/td>\n1.00<\/td>\n1.59<\/td>\n0<\/td>\n<\/tr>\n
64<\/td>\n6,400<\/td>\n12.44%<\/td>\n12.94%<\/td>\n1.04<\/td>\n1.37<\/td>\n0<\/td>\n<\/tr>\n
160<\/td>\n16,000<\/td>\n7.87%<\/td>\n7.21%<\/td>\n0.92<\/td>\n1.25<\/td>\n0<\/td>\n<\/tr>\n
640<\/td>\n64,000<\/td>\n3.93%<\/td>\n4.29%<\/td>\n1.09<\/td>\n1.09<\/td>\n1<\/td>\n<\/tr>\n
2,560<\/td>\n256,000<\/td>\n1.97%<\/td>\n2.03%<\/td>\n1.03<\/td>\n1.05<\/td>\n7<\/td>\n<\/tr>\n
10,240<\/td>\n1,024,000<\/td>\n0.98%<\/td>\n1.08%<\/td>\n1.10<\/td>\n1.03<\/td>\n118<\/td>\n<\/tr>\n
40,960<\/td>\n4,096,000<\/td>\n0.49%<\/td>\n0.46%<\/td>\n0.93<\/td>\n1.01<\/td>\n1,855<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e09\u4e2a\u89e3\u8bfb\u3002\u4e00，k=1 \u65f6\u5b9e\u6d4b CV 99.67%，\u548c\u7406\u8bba 99.01% \u5bf9\u4e0a\u2014\u2014\u5355\u70b9\u4f4d\u73af\u7b49\u4e8e\u628a\u6d41\u91cf\u968f\u673a\u6254\u7ed9\u8282\u70b9，\u8fd9\u884c\u6570\u5b57\u9a8c\u8bc1\u4e86\u5b9e\u9a8c\u53f0\u672c\u8eab\u3002\u4e8c，160 \u628a CV \u538b\u5230 7%~8%，\u6700\u5bcc\u8282\u70b9\u62ff 1.25 \u500d\u5747\u503c：10 \u4e2a\u8282\u70b9\u65f6\u610f\u5473\u7740\u6709\u7684\u673a\u5668\u6bd4\u522b\u7684\u5fd9\u56db\u5206\u4e4b\u4e00\u3002\u8fd9\u4e2a\u6570\u662f\u4ece NGINX \u7684 ketama \u9ed8\u8ba4\u503c\u4e00\u8def\u7ee7\u627f\u4e0b\u6765\u7684（\u8f6c\u8ff0\u81ea Cloudflare \u590d\u76d8），\u5b9e\u6d4b\u8bf4\u660e\u5b83\u786e\u5b9e\u628a\u4e0d\u5747\u8861\u538b\u8fdb\u4e86\u53ef\u7528\u533a\u95f4\u3002\u4e09，\u5b9e\u6d4b\u56f4\u7ed5\u7406\u8bba\u7684\u504f\u5dee\u5728 \u00b110% \u4ee5\u5185\u2014\u2014CV \u662f\u671f\u671b\u503c，\u5355\u6b21\u5b9e\u73b0\u6709\u62bd\u6837\u566a\u58f0，\u8fd9\u5f20\u8868\u6ca1\u6709\u505a\u591a\u6b21\u5e73\u5747，\u504f\u5dee\u65b9\u5411\u4e0d\u56fa\u5b9a\u5c5e\u6b63\u5e38\u3002<\/p>\n

\u6838\u5fc3\u4ee3\u7801\u4e0d\u957f，\u8fd9\u662f\u73af\u7684\u6784\u5efa\u4e0e\u67e5\u627e（\u6253\u5305\u3001\u6392\u5e8f\u3001\u4e8c\u5206）：<\/p>\n

\/\/ \u70b9\u4f4d\u6253\u5305：\u9ad8 32 \u4f4d = \u65e0\u7b26\u53f7\u54c8\u5e0c\u5f02\u6216 0x80000000（\u7b26\u53f7\u504f\u7f6e），
\n\/\/ \u4f4e 32 \u4f4d = \u8282\u70b9 id\u3002\u504f\u7f6e\u8ba9 Arrays.sort \u7684\u5e26\u7b26\u53f7 long \u5e8f\u7b49\u4ef7\u4e8e\u65e0\u7b26\u53f7\u54c8\u5e0c\u5e8f
\nstatic long pack(int hash, int id) {
\n return (((hash ^ Integer.MIN_VALUE) & 0xFFFFFFFFL) << 32) | (id & 0xFFFFFFFFL);
\n}
\nstatic long pHashU(long p) { return ((p >>> 32) ^ 0x80000000L); }
\nstatic int pId(long p) { return (int) p; }<\/p>\n

static long[] buildRing(List<String> nodes, int k) throws Exception {
\n int n = nodes.size();
\n long[] ring = new long[n * k];
\n \/\/ \u5e76\u884c\u751f\u6210：\u8282\u70b9 i \u7684\u7b2c j \u4e2a\u70b9\u4f4d = md5(name + "-" + j) \u524d 4 \u5b57\u8282
\n \/\/ \u2026\u2026（\u5e76\u884c\u586b\u5145\u7565，\u89c1\u7b2c\u4e5d\u8282\u5b8c\u6574\u6e90\u7801）\u2026\u2026
\n Arrays.sort(ring);
\n return ring;
\n}<\/p>\n

\/** \u7b2c\u4e00\u4e2a\u65e0\u7b26\u53f7\u54c8\u5e0c >= \u952e\u54c8\u5e0c\u7684\u70b9\u4f4d；\u8d8a\u8fc7\u73af\u5c3e\u56de\u7ed5\u5230 0 *\/
\nstatic int lookup(long[] ring, int hash) {
\n long key = hash & 0xFFFFFFFFL;
\n int lo = 0, hi = ring.length;
\n while (lo < hi) {
\n int mid = (lo + hi) >>> 1;
\n if (pHashU(ring[mid]) >= key) hi = mid; else lo = mid + 1;
\n }
\n if (lo == ring.length) lo = 0;
\n return pId(ring[lo]);
\n}<\/p>\n

\u4e94\u3001\u7ee7\u7eed\u52a0\u70b9\u5f00\u59cb\u5931\u51c6：4194 \u4e07\u70b9\u4f4d\u5904，\u5b9e\u6d4b\u9ad8\u51fa\u7406\u8bba 27%<\/h3>\n

\u628a\u89c4\u6a21\u63a8\u5230 N=512\u3001k \u6700\u9ad8 81920（\u603b\u70b9\u4f4d 4194 \u4e07）\u540e，\u66f2\u7ebf\u5f62\u72b6\u53d8\u4e86\u300232 \u4f4d\u54c8\u5e0c\u7a7a\u95f4\u53ea\u6709 42.9 \u4ebf\u4e2a\u683c\u5b50，\u70b9\u4f4d\u8d8a\u94fa\u8d8a\u5bc6，\u4e24\u4e2a\u8282\u70b9\u649e\u5728\u540c\u4e00\u4e2a\u54c8\u5e0c\u503c\u4e0a\u7684\u6982\u7387\u6309\u5e73\u65b9\u6da8\u2014\u2014\u751f\u65e5\u6096\u8bba\u3002\u78b0\u649e\u7684\u540e\u679c\u662f\u4e24\u4e2a\u70b9\u4f4d\u91cd\u53e0\u3001\u533a\u95f4\u8bed\u4e49\u9519\u4f4d，\u5747\u8861\u5ea6\u5f00\u59cb\u504f\u79bb\u7406\u8bba\u3002<\/p>\n\nk\u603b\u70b9\u4f4dCV \u7406\u8bbaCV \u5b9e\u6d4b\u5b9e\u6d4b\/\u7406\u8bba\u78b0\u649e\u6570\u78b0\u649e\/\u70b9\u4f4d<\/tr>\n\n\n\n\n\n\n
160<\/td>\n81,920<\/td>\n7.898%<\/td>\n7.722%<\/td>\n0.978<\/td>\n2<\/td>\n0.000024<\/td>\n<\/tr>\n
2,560<\/td>\n1,310,720<\/td>\n1.974%<\/td>\n2.034%<\/td>\n1.030<\/td>\n201<\/td>\n0.000153<\/td>\n<\/tr>\n
10,240<\/td>\n5,242,880<\/td>\n0.987%<\/td>\n1.044%<\/td>\n1.057<\/td>\n3,265<\/td>\n0.000623<\/td>\n<\/tr>\n
40,960<\/td>\n20,971,520<\/td>\n0.494%<\/td>\n0.486%<\/td>\n0.984<\/td>\n51,134<\/td>\n0.002438<\/td>\n<\/tr>\n
81,920<\/td>\n41,943,040<\/td>\n0.349%<\/td>\n0.444%<\/td>\n1.273<\/td>\n204,393<\/td>\n0.004873<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e24\u4e2a\u8bc1\u636e\u85cf\u5728\u62c6\u89e3\u7ef4\u5ea6\u91cc\u3002\u5176\u4e00，\u78b0\u649e\u6570\u5bf9\u62cd：n \u4e2a 32 \u4f4d\u968f\u673a\u70b9\u7684\u78b0\u649e\u671f\u671b\u7ea6\u4e3a n\u00b2\/2^33，n=4194 \u4e07\u65f6\u4ee3\u5165\u662f 20.4 \u4e07，\u5b9e\u6d4b 204,393\u2014\u2014\u516c\u5f0f\u6ca1\u9a97\u4eba，\u78b0\u649e\u786e\u5b9e\u662f\u5e73\u65b9\u7ea7\u7684\u3002\u5176\u4e8c，\u8fb9\u9645\u6536\u76ca\u574d\u584c：\u4ece k=40960 \u7ffb\u500d\u5230 81920，\u5185\u5b58\u7ffb\u500d，\u7406\u8bba CV \u5e94\u964d 29.3%（0.494%\u21920.349%），\u5b9e\u6d4b\u53ea\u964d 8.5%（0.486%\u21920.444%）\u2014\u2014\u6700\u540e\u4e00\u4e2a\u7ffb\u500d\u53ea\u5151\u73b0\u4e86\u7406\u8bba\u6536\u76ca\u7684 29%，\u5b9e\u6d4b\u5bf9\u7406\u8bba\u7684\u504f\u79bb\u4ece\u524d\u4e00\u683c\u7684 -1.6% \u6076\u5316\u5230 +27.3%\u3002<\/p>\n

Cloudflare \u7684\u590d\u76d8\u8d70\u5f97\u66f4\u8fdc：\u4ed6\u4eec\u5728 2048 \u8282\u70b9\u3001\u5bc6\u5ea6\u66f4\u9ad8\u7684\u914d\u7f6e\u91cc\u6d4b\u5230\u4e86 CV \u968f\u52a0\u70b9\u7edd\u5bf9\u56de\u5347\u7684\u53cd\u5411\u52a3\u5316，\u4e8e\u662f\u628a\u6bcf\u670d\u52a1\u5668\u70b9\u4f4d\u780d\u6389\u7ea6 90%（\u8f6c\u8ff0）\u3002\u672c\u673a 512 \u8282\u70b9\u88c5\u4e0d\u4e0b\u90a3\u4e2a\u5bc6\u5ea6，\u53ea\u590d\u73b0\u5230\u300c\u5931\u51c6\u300d\u8fd9\u4e00\u6b65\u5c31\u5230\u4e86\u5185\u5b58\u8fb9\u754c\u2014\u2014\u8fd9\u662f\u672c\u6587\u4e0e\u8be5\u590d\u76d8\u7684\u5dee\u8ddd，\u5148\u8bf4\u660e\u767d，\u7b2c\u516b\u8282\u8fd8\u4f1a\u6536\u4e00\u904d\u3002<\/p>\n

\u516d\u3001\u73af\u7684\u5185\u5b58\u8d26：\u540c\u6837 4194 \u4e07\u4e2a\u70b9，TreeMap \u8981 3.36GB，\u6253\u5305\u6570\u7ec4 336MB<\/h3>\n

\u5747\u8861\u5ea6\u53ea\u662f\u73af\u7684\u4e00\u534a\u6545\u4e8b，\u53e6\u4e00\u534a\u662f\u73af\u672c\u8eab\u653e\u5728\u5185\u5b58\u91cc\u7684\u5f62\u6001\u3002\u6559\u79d1\u4e66\u5b9e\u73b0\u7528 TreeMap<Long, Integer> \u5b58\u70b9\u4f4d，\u5de5\u7a0b\u5b9e\u73b0（\u542b Cloudflare \u7684\u505a\u6cd5）\u628a\u5b83\u538b\u6210\u8fde\u7eed\u6570\u7ec4\u3002\u6211\u6309 GC \u524d\u540e\u5dee\u503c\u6cd5\u5b9e\u6d4b\u4e86 100 \u4e07\u70b9\u4f4d\u4e09\u79cd\u7ed3\u6784\u7684\u6bcf\u70b9\u6210\u672c：<\/p>\n\n\u7ed3\u6784\u6bcf\u70b9\u5b57\u8282（\u5b9e\u6d4b）\u67e5\u627e p50 \/ p99\u6784\u5efa 100 \u4e07\u70b9<\/tr>\n\n\n\n\n
TreeMap<Long,Integer><\/td>\n80.1 B<\/td>\n27 ns \/ 251 ns<\/td>\n799 ms<\/td>\n<\/tr>\n
\u6392\u5e8f long[]（\u54c8\u5e0c+id \u6253\u5305）<\/td>\n8.4 B<\/td>\n\u2014 \/ \u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
int[] + int[]（\u54c8\u5e0c\u4e0e id \u5206\u79bb）<\/td>\n4.2 B<\/td>\n50 ns \/ 107 ns（\u4e8c\u5206）<\/td>\n51 ms<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

TreeMap \u7684 80.1 \u5b57\u8282\u662f\u8fd9\u4e48\u5806\u51fa\u6765\u7684：\u6bcf\u4e2a Entry \u81ea\u5e26\u5bf9\u8c61\u5934\u3001key\/value \u4e24\u4e2a\u5f15\u7528\u3001\u5de6\u53f3\u5b50\u6811\u52a0\u7236\u8282\u70b9\u4e09\u4e2a\u6307\u9488\u3001\u989c\u8272\u6807\u8bb0，\u5916\u52a0 key \u88c5\u7bb1\u51fa\u6765\u7684\u4e00\u4e2a Long \u5bf9\u8c61\u3002\u6570\u7ec4\u7ed3\u6784\u7684 8.4 \u5b57\u8282\u91cc\u6ca1\u6709\u8fd9\u4e9b\u4e1c\u897f\u3002\u67e5\u627e\u5ef6\u8fdf\u6709\u4e2a\u53cd\u76f4\u89c9\u7ec6\u8282：p50 \u4e0a TreeMap \u53cd\u800c\u66f4\u5feb（27ns \u5bf9 50ns，\u6811\u9876\u51e0\u5c42\u5e38\u9a7b\u7f13\u5b58），\u4f46 p99 \u5dee 2.3 \u500d（251 \u5bf9 107ns），\u6784\u5efa\u5dee 15.7 \u500d\u2014\u2014\u9ad8\u9891\u8def\u5f84\u4e0a，\u6570\u7ec4\u7ed3\u6784\u7684\u4f18\u52bf\u5168\u5728\u5c3e\u90e8\u5ef6\u8fdf\u548c\u91cd\u5efa\u901f\u5ea6\u4e0a\u3002<\/p>\n

\u6309\u5b9e\u6d4b\u5355\u4ef7\u5916\u63a8\u5230\u7b2c\u4e94\u8282\u90a3\u5f20 4194 \u4e07\u70b9\u4f4d\u7684\u73af：TreeMap \u5f62\u6001 3.36GB，\u6253\u5305\u6570\u7ec4 336MB\u3002\u540c\u4e00\u4e2a\u73af，\u4e24\u79cd\u5199\u6cd5，10 \u500d\u5185\u5b58\u3002Cloudflare \u4ece\u5168\u7403\u6570\u5343\u53f0\u673a\u5668\u7684\u540c\u7c7b\u7ed3\u6784\u91cc\u56de\u6536 100TB \u5185\u5b58\u3001\u628a\u6bcf\u4e2a\u70b9\u4f4d\u4ece 8 \u5b57\u8282\u624b\u5de5\u538b\u5230 6 \u5b57\u8282\u7701 25%（\u8f6c\u8ff0），\u4e58\u6570\u903b\u8f91\u548c\u8fd9\u5f20\u8868\u662f\u540c\u4e00\u4ef6\u4e8b：\u70b9\u4f4d\u5f62\u6001\u662f\u7ed3\u6784\u9009\u62e9，\u7ed3\u6784\u9009\u62e9\u662f\u5185\u5b58\u5b9a\u4ef7\u3002<\/p>\n

\u4e03\u3001\u4e24\u6b21\u8fd4\u5de5\u5b9e\u5f55：\u6570\u5b57\u5bf9\u4e0d\u4e0a\u65f6，\u5148\u6000\u7591\u5b9e\u9a8c\u53f0<\/h3>\n

\u8fd9\u7ec4\u6570\u636e\u4e0d\u662f\u4e00\u6b21\u8dd1\u5bf9\u7684\u3002\u4e24\u6b21\u8fd4\u5de5\u90fd\u503c\u5f97\u5199\u4e0b\u6765，\u56e0\u4e3a\u5b83\u4eec\u7684\u75c7\u72b6\u90fd\u4e0d\u662f\u300c\u62a5\u9519\u300d，\u800c\u662f\u300c\u51fa\u6570\u5b57\u300d\u2014\u2014\u51fa\u4e86\u6570\u5b57\u4f60\u624d\u4f1a\u53bb\u4fe1\u5b83\u3002<\/p>\n

\u8fd4\u5de5\u4e00：CV \u98de\u5230 3200%，\u81ea\u68c0 9758\/10000\u3002\u5b8c\u6574\u56e0\u679c\u94fe：Arrays.sort \u6309\u5e26\u7b26\u53f7 long \u6392\u5e8f \u2192 \u6253\u5305\u70b9\u7684\u9ad8 32 \u4f4d\u662f\u65e0\u7b26\u53f7\u54c8\u5e0c，\u51e1\u662f \u22652^31 \u7684\u70b9\u4f4d\u6700\u9ad8\u4f4d\u662f 1，\u88ab\u5f53\u6210\u8d1f\u6570\u6392\u5230\u4e86\u6570\u7ec4\u5f00\u5934 \u2192 \u73af\u5728 2^31 \u5904\u65ad\u6210\u4e24\u622a，\u6bcf\u622a\u5185\u90e8\u6709\u5e8f\u3001\u4e24\u622a\u4e4b\u95f4\u4e71\u5e8f \u2192 shares() \u6cbf\u300c\u6392\u5e8f\u6570\u7ec4\u300d\u7b97\u533a\u95f4\u957f，\u8de8\u754c\u5904\u7b97\u51fa\u8d1f\u957f\u5ea6，\u4e2a\u522b\u8282\u70b9\u541e\u4e0b\u534a\u4e2a\u73af \u2192 CV \u98de\u5230 3200%；\u4e8c\u5206\u67e5\u627e\u5728\u65ad\u70b9\u9644\u8fd1\u8fd4\u56de\u9519\u8bef\u540e\u7ee7，1 \u4e07\u6b21\u5bf9\u62cd\u5931\u914d 242 \u6b21\u3002\u4fee\u590d：\u6253\u5305\u524d\u5bf9\u54c8\u5e0c\u505a hash ^ 0x80000000 \u7b26\u53f7\u504f\u7f6e（\u65e0\u7b26\u53f7\u5e8f\u6620\u5c04\u4e3a\u5e26\u7b26\u53f7\u5e8f），\u53d6\u54c8\u5e0c\u65f6\u5f02\u6216\u56de\u6765\u3002\u4fee\u590d\u540e\u81ea\u68c0 10000\/10000，CV \u56de\u5230\u7406\u8bba\u9644\u8fd1\u3002<\/p>\n

\u8fd4\u5de5\u4e8c：N=30 \u6458\u8282\u70b9\u6d4b\u51fa 50.2% \u8fc1\u79fb，\u7406\u8bba\u53ea\u6709 3.3%\u3002\u56e0\u679c\u94fe：buildRing \u6309\u5217\u8868\u4e0b\u6807\u7ed9\u8282\u70b9\u7f16\u53f7 \u2192 \u6458\u9664\u4e2d\u95f4\u8282\u70b9\u540e，\u5176\u4f59\u8282\u70b9\u7684\u4e0b\u6807\u6574\u4f53\u51cf\u4e00 \u2192 \u8fc1\u79fb\u6bd4\u5bf9\u7528\u7684\u662f\u300c\u4e0b\u6807\u662f\u5426\u53d8\u5316\u300d\u2192 \u5c3e\u90e8 15 \u4e2a\u8282\u70b9（\u5360 46.7% \u7684\u952e）\u88ab\u8bef\u5224\u6210\u8fc1\u79fb \u2192 50.2% \u2248 46.7% + \u771f\u5b9e\u7684 3.3%\u3002\u4fee\u590d：\u6309\u8282\u70b9\u540d\u5b57\u7b26\u4e32\u6bd4\u5bf9\u7269\u7406\u8eab\u4efd，\u800c\u4e0d\u662f\u4e0b\u6807\u3002\u4fee\u590d\u540e 3.79%，\u56de\u5230 1\/30 \u52a0\u566a\u58f0\u7684\u4f4d\u7f6e\u3002<\/p>\n

\u4e24\u6761\u5171\u540c\u7684\u6559\u8bad：50.2% \u8fd9\u4e2a\u6570\u5b57\u81ea\u5df1\u5c31\u5728\u62db\u4f9b\u2014\u2014\u5b83\u6070\u597d\u7b49\u4e8e\u300c\u5c3e\u90e8\u8282\u70b9\u4efd\u989d\u52a0 1\/N\u300d，\u770b\u89c1\u8fd9\u79cd\u300c\u53ef\u7591\u5730\u63a5\u8fd1\u67d0\u4e2a\u53ef\u89e3\u91ca\u7ec4\u5408\u300d\u7684\u6570\u5b57，\u5148\u53bb\u5b9e\u9a8c\u53f0\u627e\u7ed3\u6784\u6027\u9519\u8bef，\u800c\u4e0d\u662f\u7ed9\u771f\u5b9e\u73b0\u8c61\u7f16\u6545\u4e8b\u3002\u4ee5\u53ca：\u4efb\u4f55\u300c\u6392\u5e8f\u540e\u6570\u7ec4\u300d\u7684\u7ed3\u8bba，\u5148\u95ee\u4e00\u53e5\u6309\u4ec0\u4e48\u5e8f\u6392\u7684\u3002<\/p>\n

\u516b\u3001\u9002\u7528\u8fb9\u754c\u4e0e\u98ce\u9669\u63d0\u793a<\/h3>\n

\u5148\u628a\u6210\u7acb\u8303\u56f4\u8bf4\u6e05\u695a，\u514d\u5f97\u7ed3\u8bba\u88ab\u5e26\u51fa\u5b9e\u9a8c\u5ba4\u3002<\/p>\n

1. \u672c\u6587\u5168\u90e8\u7ed3\u8bba\u5728\u5355\u673a\u8fdb\u7a0b\u5185\u6210\u7acb，\u952e\u5230\u8282\u70b9\u7684\u6620\u5c04\u662f\u7eaf\u5185\u5b58\u8ba1\u7b97；\u4e0d\u6d89\u53ca\u8de8\u673a\u623f\u7f51\u7edc\u62d3\u6251\u3001\u526f\u672c\u653e\u7f6e\u3001\u4ee5\u53ca\u6709\u754c\u8d1f\u8f7d（bounded-load）\u7684\u52a8\u6001\u518d\u5e73\u8861\u2014\u2014\u540e\u8005\u662f Cloudflare \u65b0\u65b9\u6848\u7684\u53e6\u4e00\u534a，\u672c\u6587\u672a\u5b9e\u9a8c\u3002<\/p>\n

2. \u54c8\u5e0c\u51fd\u6570\u53ea\u6d4b\u4e86 MD5 \u622a\u65ad 32 \u4f4d（ketama \u540c\u6b3e）\u3002murmur3\u3001xxHash \u7b49\u66f4\u5feb\u54c8\u5e0c\u7684\u5206\u5e03\u8d28\u91cf\u4e0e\u78b0\u649e\u7387\u672a\u5bf9\u62cd；MD5 \u5728\u8fd9\u91cc\u53ea\u627f\u62c5\u300c\u6563\u5217\u5747\u5300\u300d\u804c\u8d23，\u4e0d\u6d89\u53ca\u5bc6\u7801\u5b66\u5b89\u5168\u8bed\u4e49\u3002<\/p>\n

3. P4 \u7684\u6bcf\u70b9\u5b57\u8282\u7528 GC \u5dee\u503c\u6cd5（3 \u6b21 System.gc \u6805\u680f\u53d6\u5dee）\u4f30\u7b97，\u53d7 JVM \u5bf9\u8c61\u5e03\u5c40\u4e0e\u7248\u672c\u5f71\u54cd，\u6362 JDK \u7248\u672c\u4f1a\u6f02\u79fb；\u67e5\u627e\u5ef6\u8fdf\u7528 100 \u6279 \u00d7 1 \u4e07\u6b21\u7684\u6279\u5747\u6cd5\u2014\u2014Windows \u4e0a nanoTime \u7c92\u5ea6\u7ea6 100ns，\u5355\u6b21\u8ba1\u65f6\u7684 p50 \u4f1a\u5168\u90e8\u584c\u6210 0，\u8fd9\u4e2a\u5751\u6211\u8e29\u8fc7\u624d\u6539\u7684\u3002<\/p>\n

4. \u6ca1\u505a\u7684\u5b9e\u9a8c：\u5f02\u6784\u6743\u91cd\u8282\u70b9\u7684\u4efd\u989d\u66f2\u7ebf\u3001\u70b9\u4f4d\u547d\u540d\u7b56\u7565\u5bf9\u78b0\u649e\u7684\u5f71\u54cd\u3001\u591a\u6b21\u62bd\u6837\u5e73\u5747\u540e\u7684 CV \u7f6e\u4fe1\u533a\u95f4\u3001\u4ee5\u53ca Cloudflare \u5c3a\u5ea6（2048 \u8282\u70b9）\u4e0b CV \u7edd\u5bf9\u56de\u5347\u7684\u590d\u73b0\u2014\u2014\u672c\u673a\u5185\u5b58\u53ea\u591f\u5230 4194 \u4e07\u70b9\u4f4d\u3002\u4ee5\u4e0a\u90fd\u5c5e\u4e8e\u65b9\u5411\u63d0\u793a，\u4e0d\u662f\u7ed3\u8bba\u3002<\/p>\n

5. \u5b9e\u9a8c\u4e3a\u7eaf\u8ba1\u7b97\u8d1f\u8f7d，\u672a\u4fee\u6539\u4efb\u4f55\u7cfb\u7edf\u914d\u7f6e\u3001\u8bc1\u4e66\u6216\u7f51\u7edc\u8bbe\u7f6e；\u590d\u73b0\u53ea\u9700\u4e00\u4e2a JDK \u4e0e\u4e00\u6761\u547d\u4ee4\u3002<\/p>\n

6. AI \u8f85\u52a9\u8bf4\u660e：\u5b9e\u9a8c\u4ee3\u7801\u5728\u672c\u673a\u7f16\u8bd1\u8fd0\u884c，\u6587\u4e2d\u6240\u6709\u6570\u5b57\u53d6\u81ea\u7a0b\u5e8f\u5b9e\u9645\u8f93\u51fa\u6587\u4ef6（\u4e09\u6b21\u590d\u8dd1\u7edf\u8ba1\u5217\u4e00\u81f4）；\u6587\u5b57\u7531 AI \u8f85\u52a9\u6574\u7406，\u4e24\u6b21\u8fd4\u5de5\u8fc7\u7a0b\u5982\u5b9e\u6536\u5f55\u5728\u7b2c\u4e03\u8282\u3002<\/p>\n

\u4e5d\u3001\u590d\u73b0\u547d\u4ee4\u4e0e\u5224\u5b9a\u6807\u51c6<\/h3>\n

\u5b8c\u6574\u6e90\u7801\u662f\u4e00\u4e2a\u81ea\u5305\u542b\u7684 ConsistentHashLab.java（380 \u884c，\u542b P0 \u73af\u5883\u6253\u5370\u3001P1 \u8fc1\u79fb\u77e9\u9635\u3001P2 CV \u66f2\u7ebf\u3001P3 \u78b0\u649e\u5bc6\u5ea6\u3001P4 \u5185\u5b58\u4e0e\u67e5\u627e\u4e94\u4e2a\u9636\u6bb5，\u8f93\u51fa\u4e3a LABEL|key=value \u884c）\u3002\u6838\u5fc3\u6d41\u7a0b\u4e09\u6b65：<\/p>\n

# 1. \u7f16\u8bd1（JDK 17 \u6d4b\u8fc7；\u65e0\u9700\u4efb\u4f55\u4f9d\u8d56）
\njavac -encoding UTF-8 ConsistentHashLab.java<\/p>\n

# 2. \u8fde\u8dd1\u4e09\u6b21（-Xmx4g：P3 \u7684 4194 \u4e07\u70b9\u4f4d\u9700\u8981\u7ea6 700MB \u5806\u5cf0\u503c）
\nfor i in 1 2 3; do java -Xms2g -Xmx4g ConsistentHashLab > run$i.txt 2>&1; done<\/p>\n

# 3. \u590d\u8dd1\u4e00\u81f4\u6027：\u5ffd\u7565\u8017\u65f6\u5217\u540e\u4e09\u6b21\u8f93\u51fa\u5e94\u5b8c\u5168\u4e00\u81f4
\n# （\u628a gen_sort_ms\u3001\u6beb\u79d2\/\u7eb3\u79d2\u5217\u5254\u9664\u540e diff，\u5e94\u4e3a\u7a7a）<\/p>\n

\u5224\u5b9a\u6807\u51c6，\u6309\u987a\u5e8f\u6838\u5bf9：<\/p>\n

\u2460 \u6b63\u786e\u6027：\u8f93\u51fa\u542b P1|ring_self_check=10000\/10000，\u73af\u67e5\u627e\u4e0e\u7ebf\u6027\u626b\u63cf\u9010\u952e\u4e00\u81f4；\u5426\u5219\u5148\u67e5\u6392\u5e8f\u5e8f\u4e0e\u6253\u5305\u504f\u7f6e（\u7b2c\u4e03\u8282\u8fd4\u5de5\u4e00）\u3002<\/p>\n

\u2461 \u786e\u5b9a\u6027：P1 \u7684 12 \u884c\u8fc1\u79fb\u6570\u3001P2\/P3 \u7684 cv \u4e0e collisions \u5217\u3001P4 \u7684\u5b57\u8282\u6570\u4e09\u8dd1\u9010\u4f4d\u4e00\u81f4；\u4e0d\u4e00\u81f4\u8bf4\u660e\u952e\u7a7a\u95f4\u6216\u70b9\u4f4d\u54c8\u5e0c\u53d8\u4e86\u3002<\/p>\n

\u2462 \u951a\u70b9\u503c：P1 N=10 \u52a0\u8282\u70b9\u53d6\u6a21 90.92%\u3001\u73af 9.34%；P2 k=1 \u5b9e\u6d4b CV 99.67%\u3001k=160 \u5b9e\u6d4b 7.21%；P3 k=81920 \u78b0\u649e 204,393\u3001\u5b9e\u6d4b CV 0.4443%（\u8fd9\u4e24\u9879\u7531 MD5 \u786e\u5b9a\u6027\u51b3\u5b9a，\u5e94\u7cbe\u786e\u590d\u73b0）；P4 \u6bcf\u70b9\u5b57\u8282 TreeMap \u7ea6 80\u3001long[] \u7ea6 8.4\u3002\u4efb\u4f55\u4e00\u9879\u5bf9\u4e0d\u4e0a，\u5148\u6000\u7591\u5b9e\u9a8c\u53f0\u518d\u6000\u7591\u7ed3\u8bba\u3002<\/p>\n

\u5341\u3001\u7ed3\u8bba：\u4e09\u53e5\u8bdd\u548c\u4e00\u4e2a\u81ea\u68c0\u52a8\u4f5c<\/h3>\n

\u7b2c\u4e00，\u8fc1\u79fb\u7387\u7684\u5206\u6c34\u5cad\u5728\u952e\u4e0e\u8282\u70b9\u4e4b\u95f4\u9694\u4e0d\u9694\u4e00\u4e2a\u73af：\u53d6\u6a21\u5206\u7247\u52a0\u5220\u90fd\u662f\u4e5d\u6210\u8fc1\u79fb（90.92%\/90.01%），160 \u70b9\u4f4d\u7684\u73af\u628a\u5b83\u538b\u56de 1\/N（9.34%\/9.53%）\u2014\u2014\u8fd9\u662f\u67b6\u6784\u5dee\u5f02，\u4e0d\u662f\u53c2\u6570\u5dee\u5f02\u3002<\/p>\n

\u7b2c\u4e8c，\u865a\u62df\u8282\u70b9\u6570\u662f\u62ff\u5185\u5b58\u4e70\u5747\u8861，\u4e14\u8fd9\u7b14\u4e70\u5356\u6709\u5931\u51c6\u70b9：160 \u70b9\u628a CV \u538b\u5230\u7ea6 8%\u3001\u6700\u5bcc\u8282\u70b9 1.25 \u500d\u5747\u503c；\u7ee7\u7eed\u7ffb\u500d\u6536\u76ca\u6309\u5e73\u65b9\u6839\u8870\u51cf，4194 \u4e07\u70b9\u4f4d\u5904\u5b9e\u6d4b\u5df2\u9ad8\u51fa\u7406\u8bba 27%，\u6700\u540e\u4e00\u4e2a\u7ffb\u500d\u53ea\u5151\u73b0 29% \u7684\u7406\u8bba\u6536\u76ca\u2014\u2014\u52a0\u53c2\u6570\u4e4b\u524d\u5148\u7b97\u78b0\u649e\u671f\u671b n\u00b2\/2^33\u3002<\/p>\n

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\u4e24\u4e2a\u95ee\u9898\u7559\u7ed9\u4f60：\u4f60\u73b0\u5728\u7684\u5206\u7247\u65b9\u6848，\u4e0a\u4e00\u6b21\u6269\u5bb9\u5b9e\u9645\u642c\u4e86\u591a\u5c11\u952e，\u548c\u672c\u6587\u54ea\u4e2a\u6570\u5b57\u66f4\u63a5\u8fd1？\u5982\u679c\u8ba9\u4f60\u628a\u73af\u4ece TreeMap \u6362\u6210\u6253\u5305\u6570\u7ec4，\u4f60\u9884\u8ba1\u6700\u5927\u7684\u963b\u529b\u6765\u81ea\u4ee3\u7801\u8fd8\u662f\u6765\u81ea\u76d1\u63a7？<\/p>\n

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