{"id":2976,"date":"2025-04-26T16:22:00","date_gmt":"2025-04-26T08:22:00","guid":{"rendered":"https:\/\/guapicoding.com\/?p=2976"},"modified":"2025-10-31T09:32:58","modified_gmt":"2025-10-31T01:32:58","slug":"raftkv-%e5%88%86%e5%b8%83%e5%bc%8f%e5%ad%98%e5%82%a8","status":"publish","type":"post","link":"https:\/\/guapicoding.com\/?p=2976","title":{"rendered":"RaftKV-\u5206\u5e03\u5f0f\u5b58\u50a8"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Raft \u7b97\u6cd5<\/h2>\n\n\n\n<p>Raft \u4f5c\u4e3a\u7ecf\u5178\u7684\u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u7b97\u6cd5\uff0c\u65e8\u5728\u5b9e\u73b0\u591a\u8282\u70b9\u72b6\u6001\u673a\u7684\u9ad8\u53ef\u9760\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p>Raft \u7b97\u6cd5\u7531 leader \u8282\u70b9\u6765\u5904\u7406\u4e00\u81f4\u6027\u95ee\u9898\uff0c\u5e76\u5206\u4e3a\u4e86\u4ee5\u4e0b\u51e0\u4e2a\u5b50\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>leader \u9009\u4e3e\uff1a\u96c6\u7fa4\u4e2d\u5fc5\u987b\u5b58\u5728\u4e00\u4e2a leader \u8282\u70b9\u3002<\/li>\n\n\n\n<li>\u65e5\u5fd7\u590d\u5236\uff1aleader \u8282\u70b9\u63a5\u6536\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\uff0c\u7136\u540e\u5c06\u8fd9\u4e9b\u8bf7\u6c42\u5e8f\u5217\u5316\u6210\u65e5\u5fd7\u6570\u636e\u518d\u540c\u6b65\u5230\u96c6\u7fa4\u4e2d\u5176\u5b83\u8282\u70b9\u3002<\/li>\n\n\n\n<li>\u5b89\u5168\u6027\uff08\u5e42\u7b49\u6027\uff09\uff1a\u5982\u679c\u67d0\u4e2a\u8282\u70b9\u5df2\u7ecf\u5c06\u4e00\u6761\u63d0\u4ea4\u8fc7\u7684\u6570\u636e\u8f93\u5165 raft \u72b6\u6001\u673a\u6267\u884c\u4e86\uff0c\u90a3\u4e48\u5176\u5b83\u8282\u70b9\u4e0d\u53ef\u80fd\u518d\u5c06\u76f8\u540c\u7d22\u5f15\u7684\u53e6\u4e00\u6761\u65e5\u5fd7\u6570\u636e\u8f93\u5165\u5230 raft \u72b6\u6001\u673a\u4e2d\u6267\u884c\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e24\u4e2a\u91cd\u8981\u673a\u5236<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u89d2\u8272\u8f6c\u6362\u4e0e\u9009\u4e3e\u673a\u5236<\/strong>\uff1aRaft \u5c06\u7cfb\u7edf\u4e2d\u7684\u8282\u70b9\u5206\u4e3a Leader\u3001Follower \u548c Candidate \u4e09\u79cd\u89d2\u8272\u3002\u7cfb\u7edf\u542f\u52a8\u65f6\uff0c\u6240\u6709\u8282\u70b9\u90fd\u662f Follower\uff0cFollower \u4f1a\u5b9a\u671f\u4ece Leader \u5904\u63a5\u6536\u5fc3\u8df3\u4fe1\u606f\u4ee5\u786e\u8ba4 Leader \u7684\u5b58\u6d3b\u3002\u5982\u679c Follower \u5728\u4e00\u6bb5\u65f6\u95f4\u5185\uff08\u9009\u4e3e\u8d85\u65f6\u65f6\u95f4\uff09\u6ca1\u6709\u6536\u5230 Leader \u7684\u5fc3\u8df3\uff0c\u5b83\u4f1a\u8f6c\u53d8\u4e3a Candidate\uff0c\u53d1\u8d77\u65b0\u4e00\u8f6e\u7684\u9009\u4e3e\u3002Candidate \u5411\u5176\u4ed6\u8282\u70b9\u53d1\u9001\u8bf7\u6c42\u6295\u7968\u6d88\u606f\uff0c\u5176\u4ed6\u8282\u70b9\u6839\u636e\u6536\u5230\u7684\u8bf7\u6c42\u6295\u7968\u6d88\u606f\uff0c\u51b3\u5b9a\u662f\u5426\u4e3a\u8be5 Candidate \u6295\u7968\u3002\u5f53 Candidate \u83b7\u5f97\u8d85\u8fc7\u534a\u6570\u8282\u70b9\u7684\u6295\u7968\u65f6\uff0c\u5b83\u5c31\u6210\u4e3a\u65b0\u7684 Leader\u3002Leader \u4f1a\u5468\u671f\u6027\u5730\u5411\u6240\u6709 Follower \u53d1\u9001\u5fc3\u8df3\u6d88\u606f\uff0c\u4ee5\u7ef4\u6301\u81ea\u5df1\u7684\u9886\u5bfc\u5730\u4f4d\u3002\u6bcf\u4e2a Leader \u7684\u9886\u5bfc\u5468\u671f\u79f0\u4e3a\u4e00\u4e2a\u4efb\u671f\uff08Term\uff09\uff0c\u4efb\u671f\u53f7\u662f\u5355\u8c03\u9012\u589e\u7684\u3002<\/li>\n\n\n\n<li><strong>\u65e5\u5fd7\u590d\u5236\u673a\u5236<\/strong>\uff1a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u4f1a\u88ab Leader \u4f5c\u4e3a\u65e5\u5fd7\u6761\u76ee\u6dfb\u52a0\u5230\u81ea\u5df1\u7684\u65e5\u5fd7\u4e2d\u3002Leader \u5c06\u65b0\u7684\u65e5\u5fd7\u6761\u65e5\u590d\u5236\u5230\u5176\u4ed6 Follower\u8282\u70b9\u3002\u5b83\u4f1a\u901a\u8fc7\u9644\u52a0\u65e5\u5fd7\u6d88\u606f\u5c06\u65e5\u5fd7\u6761\u76ee\u53d1\u9001\u7ed9 Follower\uff0cFollower \u6536\u5230\u6d88\u606f\u540e\u4f1a\u5c06\u65e5\u5fd7\u6761\u76ee\u8ffd\u52a0\u5230\u81ea\u5df1\u7684\u65e5\u5fd7\u4e2d\uff0c\u5e76\u5411 Leader 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\u51fa\u73b0\u6545\u969c\uff0c\u6574\u4e2a\u96c6\u7fa4\u90fd\u4f1a\u5bf9\u5916\u505c\u6b62\u63d0\u4f9b\u670d\u52a1\uff0c\u76f4\u5230\u9009\u4e3e\u51fa\u4e0b\u4e00\u4e2a Leader\u3002<\/p>\n\n\n\n<p>Q1\uff1aFollower \u5982\u4f55\u77e5\u9053 Leader \u51fa\u73b0\u4e86\u6545\u969c\uff1f<\/p>\n\n\n\n<p>A2\uff1aLeader \u4f1a\u5b9a\u65f6\u5411\u96c6\u7fa4\u4e2d\u7684 Follower \u8282\u70b9\u53d1\u9001 AppendEntry RPC\uff08\u4f5c\u4e3a\u5fc3\u8df3\uff09\u4ee5\u8868\u660e\u81ea\u5df1\u4ecd\u7136\u5b58\u6d3b\u3002\u90a3\u4e48\uff0c\u5982\u679c\u4e00\u6bb5\u65f6\u95f4\u540e\uff08\u5373\u9009\u4e3e\u8d85\u65f6\u65f6\u95f4\uff0c\u6bcf\u4e00\u4e2a Follower \u90fd\u662f\u968f\u673a\u7684\uff09\uff0c\u67d0\u4e2aFollower \u6ca1\u6709\u6536\u5230 Leader \u53d1\u6765\u7684 AppendEntry RPC\uff0c\u90a3\u4e48\u8be5 Follower \u5c31\u4f1a\u8ba4\u4e3a\u5f53\u524d\u7684 Leader \u51fa\u73b0\u4e86\u6545\u969c\uff0c\u4ece\u800c\u8f6c\u6362\u6210 Candidate \u53d1\u8d77\u9009\u4e3e\u3002<\/p>\n\n\n\n<p>ps\uff1a\u201cFollower \u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u6ca1\u6709\u63a5\u6536\u5230 Leader \u53d1\u9001\u7684 AppendEntry RPC\u201c\uff0c\u5177\u4f53\u53ef\u4ee5\u5229\u7528\u5b9a\u65f6\u5668\u548c\u4e00\u4e2a\u6807\u5fd7\u4f4d\u5b9e\u73b0\uff0c\u6bcf\u5230\u5b9a\u65f6\u65f6\u95f4\u5c31\u68c0\u67e5\u8fd9\u671f\u95f4\u5185\u6709\u65e0 AppendEntry RPC \u5373\u53ef\u3002<\/p>\n\n\n\n<p>ps\uff1aAppeandEntry RPC \u7684\u4e24\u4e2a\u4e3b\u8981\u4f5c\u7528\u548c\u4e00\u4e2a\u9644\u5e26\u4f5c\u7528\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e3b\u8981\u4f5c\u7528\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5145\u5f53\u5fc3\u8df3<\/li>\n\n\n\n<li>\u643a\u5e26\u65e5\u5fd7 entry \u53ca\u5176\u8f85\u52a9\u4fe1\u606f\uff0c\u4ee5\u63a7\u5236\u65e5\u5fd7\u7684\u540c\u6b65\u548c\u65e5\u5fd7\u5411\u72b6\u6001\u673a\u63d0\u4ea4<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u9644\u5e26\u4f5c\u7528\uff1a\u901a\u544a Leader \u7684 index \u548c term 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class=\"wp-block-list\">\n<li>log\uff08\u65e5\u5fd7\uff09\uff1a\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u5916\u90e8\u547d\u4ee4\u662f\u4ee5 log \u4fdd\u5b58\u7684\u3002 <\/li>\n\n\n\n<li>entry\uff08\u6761\u76ee\uff09\uff1a\u65e5\u5fd7\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u8fde\u7eed\u7684\u6570\u7ec4\uff0c\u5176\u4e2d\u7684\u4e00\u6761\u5c31\u662f entry\u3002<\/li>\n\n\n\n<li>term\uff08\u4efb\u671f\uff09\uff1a\u4f5c\u4e3a\u5185\u90e8\u903b\u8f91\u65f6\u949f\uff0c\u4f7f\u7528 term \u7684\u5bf9\u6bd4\u6765\u6bd4\u8f83\u65e5\u5fd7\u3001\u8eab\u4efd\u3001\u5fc3\u8df3\u7684\u65b0\u65e7\uff0cterm \u7528\u8fde\u7eed\u7684\u6570\u5b57\u8fdb\u884c\u6807\u8bc6\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>Raft \u65e5\u5fd7\u7684\u4e24\u4e2a\u7279\u70b9\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e24\u4e2a\u8282\u70b9\u7684\u65e5\u5fd7\u4e2d\uff0c\u6709\u4e24\u4e2a entry \u62e5\u6709\u76f8\u540c\u7684 index \u548c 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\u5185\u53ea\u6709\u4e00\u5f20\u9009\u7968\uff0c\u56e0\u6b64\u4e0d\u53ef\u80fd\u6709\u4e24\u4e2a\u6216\u4ee5\u4e0a\u8282\u70b9\u540c\u65f6\u83b7\u5f97\u8d85\u8fc7\u534a\u6570\u7684\u9009\u7968\u3002<\/p>\n\n\n\n<p>\u5f53\u67d0\u4e2a\u8282\u70b9\u53d1\u751f\u6545\u969c\u65f6\uff0c\u5b83\u65e0\u6cd5\u77e5\u9053\u5f53\u524d\u6700\u65b0\u7684 Term \u662f\u591a\u5c11\u3002\u5728\u6545\u969c\u6062\u590d\u540e\uff0c\u8282\u70b9\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u8282\u70b9\u53d1\u9001\u8fc7\u6765\u7684\u5fc3\u8df3\u67e5\u770b\u6700\u65b0 Term\u3002\u5f53\u53d1\u73b0\u81ea\u5df1\u7684 Term \u5c0f\u4e8e\u6700\u65b0 Term \u65f6\uff0c\u8fd9\u610f\u5473\u7740\u81ea\u5df1\u5df2\u7ecf\u8fc7\u671f\uff0c\u4e0d\u540c\u8eab\u4efd\u7684\u8282\u70b9\u5904\u7406\u65b9\u5f0f\u6709\u6240\u4e0d\u540c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Leader \u548c Candidate\uff1a\u9000\u56de\u6210 Follower \u5e76\u66f4\u65b0 Term \u5230\u8f83\u5927\u7684\u90a3\u4e2a Term\u3002<\/li>\n\n\n\n<li>Follower\uff1a\u66f4\u65b0 Term \u5230\u8f83\u5927\u7684\u90a3\u4e2a Term\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>Q\uff1a\u4e3a\u4ec0\u4e48 Leader \u548c Candidate \u53d1\u73b0\u81ea\u5df1\u7684 Term \u5c0f\u4e8e\u5176\u4ed6\u8282\u70b9\u65f6\u4f1a\u9000\u56de\u6210 Follower\uff0c\u800c\u4e0d\u662f\u5ef6\u7eed\u8eab\u4efd\uff1f<\/strong><\/p>\n\n\n\n<p>A\uff1a<strong> <\/strong>\u56e0\u4e3a\u901a\u8fc7 Term \u4fe1\u606f\u77e5\u9053\u81ea\u5df1\u5df2\u7ecf\u8fc7\u671f\uff0c\u610f\u5473\u7740\u81ea\u5df1\u53ef\u80fd\u53d1\u751f\u4e86\u7f51\u7edc\u9694\u79bb\u7b49\u6545\u969c\uff0c\u90a3\u4e48\u5728\u6b64\u671f\u95f4\u6574\u4e2a Raft \u96c6\u7fa4\u53ef\u80fd\u5df2\u7ecf\u6709\u4e86\u65b0\u7684 Leader\u3001\u63d0\u4ea4\u4e86\u65b0\u7684\u65e5\u5fd7\uff0c\u90a3\u4e48\u6b64\u65f6\u81ea\u5df1\u7684\u65e5\u5fd7\u5c31\u662f\u6709\u7f3a\u5931\u7684\uff0c\u5982\u679c\u4e0d\u9000\u56de\u6210 Follower \u53ef\u80fd\u4f1a\u5bfc\u81f4\u6574\u4e2a\u96c6\u7fa4\u7684\u65e5\u5fd7\u7f3a\u5931\uff0c\u4e0d\u7b26\u5408\u5f3a\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p>ps\uff1a\u8be6\u89c1 <a href=\"https:\/\/guapicoding.com\/?p=2949\">Raft \u6df1\u5c42\u5256\u6790<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5171\u8bc6<\/h3>\n\n\n\n<p>\u5171\u8bc6\u662f\u5bb9\u9519\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u57fa\u672c\u95ee\u9898\uff0c\u6d89\u53ca\u591a\u4e2a\u670d\u52a1\u5668\u5bf9\u72b6\u6001\u673a\u72b6\u6001\uff08\u4e0a\u5c42\u7684 KV \u6570\u636e\u5e93\uff09\u8fbe\u6210\u4e00\u81f4\u3002\u4e00\u65e6\u8d85\u8fc7\u534a\u6570\u7684\u673a\u5668\u5bf9\u72b6\u6001\u673a\u505a\u51fa\u4e86\u540c\u4e00\u4e2a\u51b3\u5b9a\uff0c\u90a3\u4e48\u8fd9\u4e2a\u51b3\u5b9a\u5c31\u662f\u6700\u7ec8\u51b3\u5b9a\u3002\u5982\u679c\u6709\u5c11\u4e8e\u4e00\u534a\u7684\u673a\u5668\u51fa\u73b0\u6545\u969c\uff0c\u96c6\u7fa4\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\uff1b\u5982\u679c\u8d85\u8fc7\u4e00\u534a\u7684\u673a\u5668\u51fa\u73b0\u6545\u969c\uff0c\u90a3\u4e48\u96c6\u7fa4\u5c06\u505c\u6b62\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff0c\u4f46\u4e0d\u4f1a\u76f2\u76ee\u8fd4\u56de\u9519\u8bef\u7684\u7ed3\u679c\u3002  <\/p>\n\n\n\n<p>\u5171\u8bc6\u7b97\u6cd5\u8981\u6ee1\u8db3\u7684\u6027\u8d28\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u975e\u62dc\u5360\u5ead\u6761\u4ef6\u4e0b\u4fdd\u8bc1\u5171\u8bc6\u7684\u4e00\u81f4\u6027\u3002\u975e\u62dc\u5360\u5ead\u6761\u4ef6\u5c31\u662f\u53ef\u4fe1\u7684\u7f51\u7edc\u6761\u4ef6\uff0c\u5373\u4e0e\u4f60\u901a\u4fe1\u7684\u8282\u70b9\u7684\u4fe1\u606f\u90fd\u662f\u771f\u5b9e\u7684\uff0c\u4e0d\u5b58\u5728\u6b3a\u9a97\u3002<\/li>\n\n\n\n<li>\u5728\u591a\u6570\uff08\u8d85\u8fc7\u534a\u6570\uff09\u8282\u70b9\u5b58\u6d3b\u65f6\uff0c\u4fdd\u6301\u53ef\u7528\u6027\u3002\u201c\u591a\u6570\u201d\u6c38\u8fdc\u6307\u7684\u662f\u914d\u7f6e\u6587\u4ef6\u4e2d\u6240\u6709\u8282\u70b9\u7684\u591a\u6570\uff0c\u800c\u4e0d\u662f\u5b58\u6d3b\u8282\u70b9\u7684\u591a\u6570\u3002<\/li>\n\n\n\n<li>\u4e0d\u4f9d\u8d56\u4e8e\u7edd\u5bf9\u65f6\u95f4\u3002\u5171\u8bc6\u7b97\u6cd5\u8981\u5e94\u5bf9\u51fa\u73b0\u6545\u969c\u7684\u60c5\u51b5\uff0c\u5728\u8fd9\u6837\u7684\u73af\u5883\u4e2d\u7f51\u7edc\u62a5\u6587\u5f88\u53ef\u80fd\u4f1a\u53d7\u5230\u5e72\u6270\u800c\u5ef6\u8fdf\uff0c\u56e0\u6b64\u4e0d\u80fd\u5b8c\u5168\u4f9d\u9760\u7edd\u5bf9\u65f6\u95f4\u3002Raft \u7528\u81ea\u5b9a\u4e49\u7684 Term \u4f5c\u4e3a\u903b\u8f91\u65f6\u949f\u6765\u4ee3\u66ff\u7edd\u5bf9\u65f6\u95f4\u3002<\/li>\n\n\n\n<li>\u5728\u591a\u6570\u8282\u70b9\u8fbe\u6210\u4e00\u81f4\u540e\u5c31\u8fd4\u56de\u7ed3\u679c\uff0c\u800c\u4e0d\u4f1a\u53d7\u5230\u4e2a\u522b\u6162\u8282\u70b9\u7684\u5f71\u54cd\uff0c\u5373\u53ea\u8981\u5927\u591a\u6570\u8282\u70b9\u540c\u610f\u64cd\u4f5c\uff0c\u5c31\u4ee3\u8868\u6574\u4e2a\u96c6\u7fa4\u540c\u610f\u8be5\u64cd\u4f5c\u3002\u5bf9\u4e8e Raft \u6765\u8bf4\uff0c\u64cd\u4f5c\u662f\u5b58\u50a8\u5230 log\uff08\u65e5\u5fd7\uff09\u4e2d\uff0c\u4e00\u4e2a\u64cd\u4f5c\u5c31\u662f log \u4e2d\u7684\u4e00\u4e2a entry\uff08\u6761\u76ee\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u6709\u4e00\u4e2a\u5e38\u89c1\u7684\u8bef\u89e3\uff1a\u4f7f\u7528\u4e86 Raft \u6216\u8005 paxos \u7b97\u6cd5\u7684\u7cfb\u7edf\u90fd\u662f\u7ebf\u6027\u4e00\u81f4\u7684\uff08Linearizability\uff0c\u5373\u5f3a\u4e00\u81f4\uff09\uff0c\u5176\u5b9e\u4e0d\u7136\uff0c\u5171\u8bc6\u7b97\u6cd5\u53ea\u80fd\u63d0\u4f9b\u57fa\u7840\uff0c\u8981\u5b9e\u73b0\u7ebf\u6027\u4e00\u81f4\u8fd8\u9700\u8981\u5728\u7b97\u6cd5\u4e4b\u4e0a\u505a\u51fa\u66f4\u591a\u7684\u52aa\u529b\u3002<\/p>\n\n\n\n<p>\u4e00\u81f4\u6027\uff08Consistency\uff09\u7684\u542b\u4e49\u6bd4\u5171\u8bc6\uff08consensus\uff09\u8981\u5bbd\u6cdb\uff0c\u4e00\u81f4\u6027\u6307\u7684\u662f\u591a\u4e2a\u526f\u672c\u5bf9\u5916\u5448\u73b0\u7684\u72b6\u6001\u3002\u5305\u62ec\u987a\u5e8f\u4e00\u81f4\u6027\u3001\u7ebf\u6027\u4e00\u81f4\u6027\u3001\u6700\u7ec8\u4e00\u81f4\u6027\u7b49\u3002\u800c<strong>\u5171\u8bc6\u7279\u6307\u8fbe\u6210\u4e00\u81f4\u7684\u8fc7\u7a0b<\/strong>\uff0c\u4f46\u6ce8\u610f\uff0c\u5171\u8bc6\u5e76\u4e0d\u610f\u5473\u7740\u5b9e\u73b0\u4e86\u4e00\u81f4\u6027\uff0c\u4e00\u4e9b\u60c5\u51b5\u4e0b\u4ed6\u662f\u505a\u4e0d\u5230\u7684\u3002<\/p>\n\n\n\n<p>Raft \u662f CP \u7cfb\u7edf\uff0c\u4fdd\u8bc1\u4e86\u5f3a\u4e00\u81f4\u6027\u548c\u5206\u533a\u5bb9\u5fcd\u6027\uff0c\u4f46\u727a\u7272\u4e86\u90e8\u5206\u9ad8\u53ef\u7528\u6027\u3002\u6bd4\u5982\uff1a\u5f53 Leader \u8282\u70b9\u51fa\u73b0\u6545\u969c\u540e\uff0c\u7cfb\u7edf\u9700\u8981\u4e00\u6bb5\u65f6\u95f4\u8fdb\u884c\u91cd\u65b0\u9009\u4e3e\uff0c\u8fd9\u6bb5\u65f6\u95f4\u7cfb\u7edf\u5904\u4e8e\u4e0d\u53ef\u7528\u72b6\u6001\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b8f\u89c2\u67b6\u6784<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Raft \u96c6\u7fa4\n<ul class=\"wp-block-list\">\n<li>Raft \u8282\u70b9\uff1aRaft \u7b97\u6cd5\u7684\u5b9e\u73b0\u6838\u5fc3\uff0c\u8d1f\u8d23\u4e0e\u96c6\u7fa4\u4e2d\u7684\u5176\u4ed6 Raft \u8282\u70b9\u6c9f\u901a\uff0c\u8fbe\u5230\u5206\u5e03\u5f0f\u5171\u8bc6\u7684\u76ee\u7684\u3002<\/li>\n\n\n\n<li>kvServer\uff1a\u8d1f\u8d23 Raft \u8282\u70b9\u3001KV \u6570\u636e\u5e93\u548c Clerk \u5ba2\u6237\u7aef\u4e4b\u95f4\u7684\u534f\u8c03\u670d\u52a1\uff0c\u76f8\u5f53\u4e8e\u4e09\u8005\u4e4b\u95f4\u7684\u6865\u6881\uff1b\u8fd8\u8d1f\u8d23\u6301\u4e45\u5316 KV \u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u6301\u4e45\u5c42\uff1a\u8d1f\u8d23\u76f8\u5173\u6570\u636e\u7684\u843d\u76d8\u3002\u5bf9\u4e8e Raft \u8282\u70b9\uff0c\u5bf9\u4e00\u4e9b\u5173\u952e\u6570\u636e\uff08\u6bd4\u5982\u65e5\u5fd7\uff09\u8fdb\u884c\u843d\u76d8\u5904\u7406\uff0c\u4ee5\u4fdd\u8bc1\u8282\u70b9\u5b95\u673a\u91cd\u542f\u540e\u53ef\u4ee5\u6062\u590d\u5173\u952e\u6570\u636e\uff1b\u5bf9\u4e8e kvServer\uff0c\u5bf9 KV \u6570\u636e\u5e93\u7684\u6570\u636e\u8fdb\u884c\u843d\u76d8\u5904\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Clerk \uff1a\u5ba2\u6237\u7aef\uff08Leader \u8282\u70b9\u8d1f\u8d23\u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u4e0d\u8fc7\u8981\u901a\u8fc7 kvServer\uff09<\/li>\n\n\n\n<li>\u4e0a\u5c42\u72b6\u6001\u673a\uff08KV \u6570\u636e\u5e93\uff09\uff1a\u8d1f\u8d23\u6570\u636e\u5b58\u50a8\u3002<\/li>\n\n\n\n<li>RPC \u901a\u4fe1\u6846\u67b6\uff1a\u4e3a Leader \u9009\u4e3e\u3001\u65e5\u5fd7\u590d\u5236\u3001\u6570\u636e\u67e5\u8be2\u3001\u5fc3\u8df3\u53d1\u9001\u7b49\u591a\u4e2a\u64cd\u4f5c\u63d0\u4f9b\u591a\u8282\u70b9\u3001\u7b80\u5355\u5feb\u901f\u7684\u901a\u4fe1\u529f\u80fd\u3002<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/ChatGPT-Image-2025\u5e745\u670824\u65e5-11_11_41.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/ChatGPT-Image-2025\u5e745\u670824\u65e5-11_11_41.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-3119\" style=\"width:536px;height:auto\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n<\/div>\n\n\n<p><strong>\u4e00\u6b21\u8bf7\u6c42\u7684\u7b80\u5316\u6d41\u7a0b\u56fe\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>      \u5ba2\u6237\u7aef\u8bf7\u6c42 (Put \/ Get \/ Append)\n                \u2193\n     KvServer::PutAppend() \/ Get()\n                \u2193\n    KvServer \u2192 Raft::Start() \u53d1\u8d77\u65e5\u5fd7\u8ffd\u52a0\u8bf7\u6c42\n                \u2193\n    Raft (\u590d\u5236\u65e5\u5fd7\uff0c\u8fbe\u6210\u591a\u6570\u6d3e\u4e00\u81f4)\n                \u2193\n   applyChan.push_back(ApplyMsg) \u2190 KvServer::ReadRaftApplyCommandLoop()\n                \u2193\n     \u5e94\u7528\u65e5\u5fd7\u547d\u4ee4\u5230 m_skipList \/ kvDB\n                \u2193\n     \u56de\u590d\u5ba2\u6237\u7aef\uff08\u901a\u8fc7\u56de\u8c03 \/ \u7ed3\u679c\u901a\u9053\uff09<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Raft \u4ee3\u7801<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Raft \u7684\u4e3b\u8981\u6d41\u7a0b<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u521d\u59cb\u5316\u8282\u70b9<\/h4>\n\n\n\n<p>init()\uff1a\u521d\u59cb\u5316\u4e00\u4e2a Raft \u8282\u70b9\uff0c\u5bf9\u4efb\u671f\u3001\u8eab\u4efd\u3001\u65e5\u5fd7\u63d0\u4ea4\u7d22\u5f15\u7b49\u5173\u952e\u72b6\u6001\u8fdb\u884c\u521d\u59cb\u5316\uff1b\u5982\u679c\u6709\u5feb\u7167\u5c31\u4ece\u6301\u4e45\u5316\u4e2d\u6062\u590d\uff1b\u542f\u52a8\u4e09\u4e2a\u5b9a\u65f6\u5668\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>leaderHearBeatTicker\uff1aLeader \u5468\u671f\u6027\u53d1\u9001\u5fc3\u8df3\uff08<strong>\u9ed8\u8ba425ms\uff0c\u4e00\u822c\u6bd4\u9009\u4e3e\u8d85\u65f6\u5c0f\u4e00\u4e2a\u6570\u91cf\u7ea7<\/strong>\uff09\u3002<\/li>\n\n\n\n<li>electionTimeOutTicker\uff1aFollower \u68c0\u6d4b\u9009\u4e3e\u8d85\u65f6\uff08<strong>\u968f\u673a\uff0c\u5728300~500ms\u4e4b\u95f4<\/strong>\uff09\u3002<\/li>\n\n\n\n<li>applierTicker\uff1a\u5b9a\u671f\u5c06\u65e5\u5fd7\u5e94\u7528\u5230\u72b6\u6001\u673a\u4e2d\uff08<strong>\u9ed8\u8ba410ms<\/strong>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u9886\u5bfc\u9009\u4e3e<\/h4>\n\n\n\n<p>\u89c1\u4e0b\u56fe F2.\u9886\u5bfc\u9009\u4e3e\u6d41\u7a0b<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code><strong>electionTimeOutTicker()<\/strong><\/code>\uff1a\u8d1f\u8d23\u5224\u65ad\u662f\u5426\u8be5\u53d1\u8d77\u9009\u4e3e\uff0c\u5982\u679c\u8be5\u5c31\u6267\u884c doElection() \u53d1\u8d77\u9009\u4e3e\u3002\n<ul class=\"wp-block-list\">\n<li>\u5728\u6b7b\u5faa\u73af\u4e2d\uff0c\u9996\u5148\u8ba1\u7b97\u8ddd\u79bb\u4e0b\u4e00\u6b21\u8d85\u65f6\u5e94\u8be5\u7761\u7720\u7684\u65f6\u95f4\uff08\u5373\u4e0a\u6b21\u91cd\u7f6e\u9009\u4e3e\u8ba1\u65f6\u5668\u7684\u65f6\u95f4 + \u968f\u673a\u5316\u7684\u9009\u4e3e\u8d85\u65f6\u65f6\u95f4 &#8211; \u5f53\u524d\u65f6\u95f4\uff09\uff0c\u7136\u540e\u7761\u7720\u8fd9\u6bb5\u65f6\u95f4\u3002\u82e5\u9192\u6765\u540e\u53d1\u73b0\u5728\u7761\u7720\u671f\u95f4\u9009\u4e3e\u7684\u8d85\u65f6\u5b9a\u65f6\u5668\u88ab\u91cd\u7f6e\uff0c\u5219\u7ee7\u7eed\u5faa\u73af\uff1b\u82e5\u6ca1\u6709\u88ab\u91cd\u7f6e\uff0c\u5219\u8c03\u7528 doElection() \u89e6\u53d1\u9009\u4e3e\u3002<\/li>\n\n\n\n<li><strong>\u9009\u4e3e\u8d85\u65f6\u5b9a\u65f6\u5668\u662f\u5426\u91cd\u7f6e\u7684\u6761\u4ef6\u662f\uff1a\u6536\u5230 Leader \u53d1\u6765\u7684 AppendEntryRPC\uff08\u65e5\u5fd7\u540c\u6b65\u548c\u5fc3\u8df3\uff09\u6216\u7ed9\u5176\u4ed6\u8282\u70b9\u9009\u4e3e\u6295\u7968\u3002<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>doElection()<\/strong><\/code>\uff1a\u5b9e\u9645\u53d1\u8d77\u9009\u4e3e\uff0c\u5728\u9009\u4e3e\u5b9a\u65f6\u5668\u8d85\u65f6\u65f6\u8c03\u7528\u3002\u6784\u9020\u9700\u8981\u53d1\u9001\u7684 RPC\uff08\u5373 RequestVote RPC\uff09\uff0c\u5e76\u521b\u5efa<strong>\u591a\u7ebf\u7a0b<\/strong>\u8c03\u7528 sendRequestVote() \u5904\u7406 RPC \u53ca\u54cd\u5e94\u3002\n<ul class=\"wp-block-list\">\n<li>1.\u72b6\u6001\u7531 follower \u8f6c\u6362\u4e3a candidate<\/li>\n\n\n\n<li>2.\u4efb\u671f +1<\/li>\n\n\n\n<li>3.\u7ed9\u81ea\u5df1\u6295\u7968<\/li>\n\n\n\n<li>4.\u5f81\u6c42\u5176\u4ed6\u8282\u70b9\u7684\u7968<\/li>\n\n\n\n<li>ps\uff1a\u5f53\u9009\u4e3e\u7684\u65f6\u5019\u5b9a\u65f6\u5668\u8d85\u65f6\u5c31\u5fc5\u987b\u91cd\u65b0\u9009\u4e3e\uff0c\u4e0d\u7136\u4f1a\u56e0\u4e3a\u6ca1\u6709\u9009\u7968\u800c\u5361\u4f4f\uff0cterm \u4e5f\u8981\u589e\u52a0\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>sendRequestVote()<\/strong><\/code>\uff1a\u8d1f\u8d23\u53d1\u9001\u9009\u4e3e RPC\uff0c\u5e76\u63a5\u6536\u548c\u5904\u7406\u5bf9\u7aef\u53d1\u9001\u56de\u6765\u7684\u54cd\u5e94\u3002\n<ul class=\"wp-block-list\">\n<li>\u5411\u6307\u5b9a\u7684\u8282\u70b9\u53d1\u9001 RequestVote RPC \u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>\u68c0\u67e5 RPC \u7684\u8fd4\u56de\u7ed3\u679c\uff0c\u5e76\u8fdb\u884c\u9009\u4e3e\u6295\u7968\u7ed3\u679c\u7edf\u8ba1\u3002\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u56de\u590d\u8282\u70b9\u7684 term \u6bd4\u81ea\u5df1\u7684\u5927\uff0c\u8bf4\u660e\u81ea\u5df1\u843d\u540e\u4e86\uff0c\u5c31\u9000\u56de\u5230 follower \u72b6\u6001\u5e76\u628a term \u66f4\u65b0\u4e3a\u8f83\u5927\u7684\u90a3\u4e2a\uff08\u53ea\u8981\u4fee\u6539\u4e86\u72b6\u6001\u5c31\u8981\u6301\u4e45\u5316\uff09\u3002<\/li>\n\n\n\n<li>\u5982\u679c term \u4e00\u6837\uff0c\u5219\u5224\u65ad\u5bf9\u65b9\u662f\u5426\u628a\u7968\u6295\u7ed9\u4e86\u81ea\u5df1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5982\u679c\u83b7\u5f97\u8fc7\u534a\u9009\u7968\uff0c\u5219\u5c06\u81ea\u8eab\u8f6c\u53d8\u4e3a leader \u5e76\u521d\u59cb\u5316\u9886\u5bfc\u8005\u72b6\u6001\u3002\n<ul class=\"wp-block-list\">\n<li>\u7ef4\u62a4\u5bf9\u6bcf\u4e2a follower \u7684\u65e5\u5fd7\u540c\u6b65\u4fe1\u606f\uff1a\n<ul class=\"wp-block-list\">\n<li>m_nextIndex[i] = lastLogIndex + 1; \/\/ \u4e0b\u4e00\u6b21\u8981\u53d1\u9001\u7684\u65e5\u5fd7\u6761\u76ee\u7d22\u5f15<\/li>\n\n\n\n<li>m_matchIndex[i] = 0; \/\/ \u8868\u793a follower \u6700\u540e\u5339\u914d\u7684\u65e5\u5fd7\u6761\u76ee\uff0c\u6bcf\u6362\u4e00\u4e2a\u9886\u5bfc\u90fd\u8981\u4ece0\u5f00\u59cb<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5f00\u59cb\u53d1\u9001\u5fc3\u8df3<\/li>\n\n\n\n<li>\u6301\u4e45\u5316<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>RequestVote()<\/strong><\/code>\uff1a<strong>\u63a5\u6536\u522b\u4eba\u53d1\u6765\u7684\u9009\u4e3e\u8bf7\u6c42\uff0c\u68c0\u9a8c\u662f\u5426\u8981\u7ed9\u5bf9\u65b9\u6295\u7968\uff0c\u5e76\u5c06\u51b3\u5b9a\u56de\u590d\u7ed9\u5bf9\u65b9\u3002<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u5019\u9009\u8005\u7684 term \u6bd4\u81ea\u5df1<strong>\u5c0f<\/strong>\uff1a\u8bf4\u660e\u51fa\u73b0\u8fc7\u7f51\u7edc\u5206\u533a\uff0c\u4ed6\u5df2\u7ecf\u8fc7\u65f6\u4e86\uff0c\u62d2\u7edd\u7ed9\u4ed6\u6295\u7968\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5019\u9009\u8005\u7684 term \u6bd4\u81ea\u5df1<strong>\u5927<\/strong>\uff1a\u8bf4\u660e\u51fa\u73b0\u8fc7\u7f51\u7edc\u5206\u533a\uff0c\u6211\u5df2\u7ecf\u8fc7\u65f6\u4e86\uff0c\u66f4\u65b0\u81ea\u5df1\u7684 term\uff08\u662f\u5426\u7ed9\u4ed6\u6295\u7968\u8fd8\u8981\u770b\u540e\u9762\uff09\u3002<\/li>\n\n\n\n<li>\u4e24\u8282\u70b9 term \u76f8\u540c\uff0c\u6bd4\u8f83\u65e5\u5fd7<strong>\u65b0\u65e7<\/strong>\uff0c\u5982\u679c\u5019\u9009\u8005\u7684\u65e5\u5fd7\u4e0d\u65e7\u4e8e\u81ea\u5df1\u7684\u65e5\u5fd7\uff0c\u8003\u8651\u7ed9\u4ed6\u6295\u7968\u3002<\/li>\n\n\n\n<li>\u5224\u65ad\u81ea\u5df1\u672c\u8f6e\u6295\u7968\u662f\u5426\u5df2\u7ecf\u6295\u7ed9\u8fc7\u522b\u4eba\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u6295\u7ed9\u8be5\u5019\u9009\u8005\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u65e5\u5fd7\u540c\u6b65\u548c\u5fc3\u8df3<\/h4>\n\n\n\n<p>\u89c1\u4e0b\u56fe F3.\u65e5\u5fd7\u590d\u5236\u4e0e\u5fc3\u8df3\u6d41\u7a0b<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code><strong>leaderHearBeatTicker()<\/strong><\/code>\uff1a\u8d1f\u8d23\u5224\u65ad\u662f\u5426\u8be5\u53d1\u9001\u5fc3\u8df3\uff0c\u5982\u679c\u8be5\u53d1\u9001\u5c31\u6267\u884c doHeartBeat()\u3002\n<ul class=\"wp-block-list\">\n<li><code>std::chrono::duration&lt;signed long int, std::ratio&lt;1, 1000000000&gt;&gt; suitableSleepTime{};<\/code>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 <code>std::chrono<\/code>\uff08\u53ef\u5f31 no\uff09\u65f6\u95f4\u5e93\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7eb3\u79d2\u7ea7\u522b\u7684\u65f6\u95f4\u6bb5\uff08duration\uff09\u5bf9\u8c61\uff0c\u5e76\u4e14\u9ed8\u8ba4\u521d\u59cb\u5316\u4e3a 0 \u7eb3\u79d2\u3002\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u76ee\u7684\u662f\u4e3a\u4e86\u8ba9\u8d1f\u8d23\u5fc3\u8df3\u5b9a\u65f6\u5668\u7684\u7ebf\u7a0b\u7761\u7720\uff0c\u907f\u514d\u7ebf\u7a0b\u9891\u7e41\u68c0\u67e5\u5fc3\u8df3\u662f\u5426\u88ab\u91cd\u7f6e\uff0c\u5bfc\u81f4 cpu \u7a7a\u8f6c\u3002 <\/li>\n\n\n\n<li>\u7761\u7720\u65f6\u95f4\u8ba1\u7b97\u516c\u5f0f = \u4e0a\u4e00\u6b21\u5fc3\u8df3\u65f6\u95f4\u70b9 + \u5fc3\u8df3\u5468\u671f &#8211; \u5f53\u524d\u65f6\u95f4<\/li>\n\n\n\n<li>\u5982\u679c\u5728\u7761\u7720\u7684\u8fd9\u6bb5\u65f6\u95f4\u5185\u5b9a\u65f6\u5668\u88ab\u91cd\u7f6e\u8fc7\uff08\u5373 lastRestHearBeatTime &gt; \u7761\u7720\u524d\u53d6\u7684\u201c\u5f53\u524d\u65f6\u95f4\u201dwakeTime\uff09\u5219\u7ee7\u7eed\u4fdd\u6301\u7761\u7720\uff0c\u5982\u679c\u6ca1\u6709\u5c31\u4f1a\u6267\u884c\u5b9e\u9645\u7684\u5fc3\u8df3\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li><strong>Leader \u4e3a\u4ec0\u4e48\u8981\u8003\u8651\u5b9a\u65f6\u5668\u91cd\u7f6e\uff0c\u76f4\u63a5\u6309\u56fa\u5b9a\u95f4\u9694 <code>HeartBeatTimeout<\/code> \u53d1\u9001\u5fc3\u8df3\u4e0d\u5c31\u597d\u4e86\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u56e0\u4e3a\u5728\u5b9e\u9645\u5b9e\u73b0\u4e2d\uff0c\u8ffd\u52a0\u65e5\u5fd7\u6761\u76ee\u548c\u5fc3\u8df3\u90fd\u5c5e\u4e8e AppendEntries RPC\uff0c\u5fc3\u8df3\u53ef\u4ee5\u770b\u6210\u6570\u636e\u4e3a\u7a7a\u7684 AppendEntries RPC\u3002\u90a3\u4e48\u5728\u5fc3\u8df3\u7761\u7720\u671f\u95f4\uff0c\u5982\u679c Leader \u5411 Follower \u53d1\u9001 AppendEntries RPC \u8fdb\u884c\u65e5\u5fd7\u540c\u6b65\uff0c\u4e5f\u89c6\u4e3a\u53d1\u9001\u4e86\u5fc3\u8df3\uff08\u56e0\u4e3a\u5fc3\u8df3\u672c\u8d28\u5c31\u662f\u544a\u8bc9\u522b\u4eba\u81ea\u5df1\u8fd8\u5728\uff09\uff0c\u6240\u4ee5\u5728\u7761\u7720\u671f\u95f4\u5fc3\u8df3\u5b9a\u65f6\u5668\u53ef\u80fd\u4f1a\u88ab\u91cd\u7f6e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u7761\u7720\u903b\u8f91\u548c\u9009\u4e3e\u5b9a\u65f6\u5668 electionTimeOutTicker \u7684\u8bbe\u8ba1\u57fa\u672c\u4e00\u81f4\uff0c\u552f\u4e00\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5468\u671f\u65f6\u95f4\uff0c\u8fd9\u91cc\u5fc3\u8df3\u95f4\u9694\u65f6\u95f4\u8bbe\u7f6e\u4e3a\u56fa\u5b9a\u7684 25\u6beb\u79d2\uff0c\u800c electionTimeoutTicker \u662f\u6839\u636e  getRandomizedElectionTimeout() \u5728 300~500 \u6beb\u79d2\u4e4b\u95f4\u968f\u673a\u83b7\u53d6\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>doHeartBeat()<\/strong><\/code>\uff1afor \u5faa\u73af\u5411\u6bcf\u4e2a follower<strong> \u53d1\u9001\u5fc3\u8df3<\/strong>\uff08\u7a7a\u7684 AppendEntries RPC\uff09\u6216\u65e5\u5fd7\u6761\u76ee\uff08<strong>\u540c\u6b65\u65e5\u5fd7<\/strong>\uff09\u6216\u542f\u7528\u65b0\u7ebf\u7a0b<strong>\u53d1\u9001\u5feb\u7167<\/strong>\uff08\u5982\u679c follower \u843d\u540e\u592a\u591a\uff09\uff0c\u5e76\u66f4\u65b0 m_lastResetHearBeatTime\uff0c\u7528\u4e8e\u5fc3\u8df3\u8282\u594f\u63a7\u5236\u3002\n<ul class=\"wp-block-list\">\n<li>\u5224\u65ad\u662f\u5426\u53d1\u9001\u5feb\u7167\uff1a<code>if (m_nextIndex[i] &lt;= m_lastSnapshotIncludeIndex)<\/code>\n<ul class=\"wp-block-list\">\n<li><code>m_nextIndex[i]<\/code>\uff1a\u8868\u793a Leader \u8981\u53d1\u9001\u7ed9\u8be5 follower \u7684\u4e0b\u4e00\u6761\u65e5\u5fd7\u7d22\u5f15<\/li>\n\n\n\n<li><code>m_lastSnapshotIncludeIndex<\/code>\uff1aLeader \u6700\u65b0\u5feb\u7167\u5305\u542b\u7684\u6700\u540e\uff08\u6700\u65b0\uff09\u4e00\u6761\u65e5\u5fd7\u7d22\u5f15<\/li>\n\n\n\n<li>\u8bf4\u660e follower \u592a\u843d\u540e\uff0cleader \u7684\u65e5\u5fd7\u4e2d\u5df2\u7ecf\u6ca1\u6709\u5bf9\u5e94\u6761\u76ee\u4e86 \u279c \u53ea\u80fd\u53d1\u5feb\u7167<\/li>\n\n\n\n<li>\u542f\u52a8\u7ebf\u7a0b\u53d1\u5feb\u7167\u5c31\u4e0d\u7528\u518d\u53d1\u9001 AppendEntries RPC \u4e86\uff0c\u76f4\u63a5 continue \u8df3\u8fc7\u8fd9\u6b21\u5faa\u73af\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u51c6\u5907 AppendEntries RPC\uff08\u65e5\u5fd7\u540c\u6b65\uff09\n<ul class=\"wp-block-list\">\n<li>\u6784\u9020 AE \u53c2\u6570\u7ed3\u6784\u4f53\n<ul class=\"wp-block-list\">\n<li>appendEntriesArgs-&gt;set_term(m_currentTerm); \/\/ \u4efb\u671f <\/li>\n\n\n\n<li>appendEntriesArgs-&gt;set_leaderid(m_me); \/\/ ID<\/li>\n\n\n\n<li>appendEntriesArgs-&gt;set_prevlogindex(preLogIndex); \/\/ \u8be5 follower \u6700\u540e\u5339\u914d\u7684\u65e5\u5fd7\u6761\u76ee\u7684\u7d22\u5f15<\/li>\n\n\n\n<li>appendEntriesArgs-&gt;set_prevlogterm(PrevLogTerm); \/\/ \u8be5 follower \u6700\u540e\u5339\u914d\u7684\u65e5\u5fd7\u6761\u76ee\u7684\u4efb\u671f<\/li>\n\n\n\n<li>appendEntriesArgs-&gt;set_leadercommit(m_commitIndex); \/\/ leader \u5df2\u63d0\u4ea4\u7684\u6700\u65b0\u7684\u65e5\u5fd7\u7d22\u5f15<\/li>\n\n\n\n<li>appendEntriesArgs-&gt;clear_entries(); \/\/ \u9632\u6b62\u6709\u6b8b\u7559\u7684\u65e5\u5fd7\u6761\u76ee\u4fe1\u606f\u548c\u65b0\u7684\u4e00\u8d77\u53d1\u9001\u51fa\u53bb<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6784\u9020\u8be5\u53d1\u9001\u7684\u65e5\u5fd7\u6761\u76ee\n<ul class=\"wp-block-list\">\n<li><code>if (preLogIndex != m_lastSnapshotIncludeIndex)<\/code>\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u6700\u540e\u5339\u914d\u7684\u65e5\u5fd7\u6761\u76ee\u4e0d\u662f\u5feb\u7167\u7684\u6700\u540e\u4e00\u4e2a\u6761\u76ee\uff0c\u5c31<strong>\u5728\u5339\u914d\u70b9\u5f00\u59cb\u53d1<\/strong><\/li>\n\n\n\n<li>\u5426\u5219\uff0c\u5c31<strong>\u4ece\u5934\u5f00\u59cb\u53d1<\/strong>\uff08\u5373 <code>m_logs<\/code> \u4e2d\u7684\u5168\u91cf\u6761\u76ee\uff0c\u56e0\u4e3a\u518d\u4e4b\u524d\u7684\u6761\u76ee\u5df2\u7ecf\u8fdb\u5feb\u7167\u4e86\uff0c\u6240\u4ee5\u5728\u6570\u7ec4\u4e2d\u88ab\u6e05\u9664\u4e86\uff09<\/li>\n\n\n\n<li>\u6211\u8bbe\u7f6e\u7684\u5236\u4f5c\u5feb\u7167\u9608\u503c\u4e3a 0.6\uff0c\u6570\u636e\u5e93\u603b\u5927\u5c0f\u4e3a5000\u5b57\u8282\uff08\u6d4b\u8bd5\u65f6\u9608\u503c\u4e3a 0.1\uff0c\u6570\u636e\u5e93\u603b\u5927\u5c0f\u4e3a500\u5b57\u8282\uff09\u3002<\/li>\n\n\n\n<li>\u6bcf\u4e2a\u8282\u70b9\u90fd\u6709\u6743\u5229\u751f\u6210\u5feb\u7167\uff0c\u628a\u9700\u8981\u6301\u4e45\u5316\u7684\u5185\u5bb9\u5b58\u5230\u672c\u8282\u70b9\u7684\u4e0a\u5c42\u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>raftRpcProctoc::LogEntry* sendEntryPtr = appendEntriesArgs-&gt;add_entries();<\/code> \/\/ \u8ffd\u52a0\u4e00\u4e2a\u7a7a\u7684 <code>LogEntry<\/code> \u5230 <code>entries<\/code> \u4e2d\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u5b83\u7684\u6307\u9488\uff0c\u65b9\u4fbf\u7acb\u523b\u8d4b\u503c\u3002<\/li>\n\n\n\n<li><code>*sendEntryPtr = m_logs[j];<\/code> \/\/ \u5c06\u65e5\u5fd7\u6761\u76ee\u6570\u636e\u6df1\u62f7\u8d1d\u7ed9\u65b0\u6dfb\u52a0\u7684\u65e5\u5fd7\u6761\u76ee<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u65ad\u8a00\u4fdd\u8bc1\u53d1\u9001\u7684\u65e5\u5fd7\u6761\u76ee\u6570\u91cf\u6b63\u786e<\/li>\n\n\n\n<li>\u6784\u9020\u8fd4\u56de\u503c AppendEntriesReply <\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u53d1\u9001 AppendEntries RPC\n<ul class=\"wp-block-list\">\n<li><code>std::thread t(&amp;Raft::sendAppendEntries, this, i, appendEntriesArgs, appendEntriesReply,appendNums); <\/code><\/li>\n\n\n\n<li>\u9488\u5bf9\u6bcf\u4e2a follower \u90fd\u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b\u5e76\u4f20\u9012\u53c2\u6570\u6267\u884c\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u66f4\u65b0\u6700\u540e\u4e00\u6b21\u5fc3\u8df3\u65f6\u95f4\uff1a<code>m_lastResetHearBeatTime = now()<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>sendAppendEntries()<\/strong><\/code>\uff1a\u8d1f\u8d23\u53d1\u9001\u65e5\u5fd7\u7684 RPC\uff0c\u5728\u53d1\u9001\u5b8c\u540e\u8fd8\u9700\u8981\u8d1f\u8d23\u63a5\u6536\u5e76\u5904\u7406\u5bf9\u7aef\u53d1\u9001\u56de\u6765\u7684\u54cd\u5e94\u3002\n<ul class=\"wp-block-list\">\n<li>1. \u8c03\u7528 RPC -&gt; \u68c0\u67e5 ok\uff1f \n<ul class=\"wp-block-list\">\n<li><code>ok == false<\/code> \u8868\u793a RPC \u8fde\u63a5\u5931\u8d25\uff08\u7f51\u7edc\u4e2d\u65ad\u3001\u5b95\u673a\u7b49\uff09\u3002<\/li>\n\n\n\n<li>\u6240\u4ee5\u5982\u679c\u8fde reply \u90fd\u6ca1\u62ff\u5230\uff0c\u5c31\u76f4\u63a5\u8fd4\u56de ok\uff0c\u4e5f\u5c31\u662f false\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>2. \u68c0\u67e5 reply-&gt;appstate() == Disconnected\uff1f-&gt; \u662f\u5219\u8fd4\u56de\n<ul class=\"wp-block-list\">\n<li>\u867d\u7136 RPC \u901a\u4e86\uff0c\u62ff\u5230 reply \u4e86\uff0c\u4f46\u5bf9\u7aef\u72b6\u6001\u4e0d\u6b63\u5e38\uff08\u6bd4\u5982\u5728\u6062\u590d\u4e2d\uff09\uff0c\u5c31\u4e0d\u7ee7\u7eed\u5904\u7406\u4e86\uff0c\u76f4\u63a5\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>3. \u68c0\u67e5 term\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c <code>reply-&gt;term &gt; m_currentTerm<\/code>\uff0c\u8bf4\u660e\u81ea\u5df1\u8fd9\u4e2a leader \u843d\u540e\u4e86\uff0c\u56e0\u6b64\u964d\u7ea7\u4e3a follower\uff0c\u66f4\u65b0 term \u548c votedFor\uff0c\u5e76 <code>persist()<\/code> \u6301\u4e45\u5316\u72b6\u6001\u3002<\/li>\n\n\n\n<li>\u5982\u679c <code>reply-&gt;term &gt; m_currentTerm<\/code>\uff0c\u8bf4\u660e\u5bf9\u65b9\u8fd9\u4e2a follower \u843d\u540e\u4e86\uff0c\u4e4b\u524d\u7684\u65e5\u5fd7\u53ef\u80fd\u90fd\u6ca1\u540c\u6b65\uff0c\u76f4\u63a5\u4e0d\u8981\u5b83\u7684\u7968\uff08\u6ce8\u610f\u8ddf\u9009\u4e3e\u4e0d\u540c\uff0c\u5373\u4f7f follower \u843d\u540e\uff0ccandidate \u4f9d\u7136\u4f1a\u8981\u7968\uff0c\u4f46 follower \u4e0d\u4e00\u5b9a\u4f1a\u7ed9\u7968\uff09\u3002<\/li>\n\n\n\n<li>\u4e4b\u540e\u7684\u60c5\u51b5\u5c31\u90fd\u662f\u4e24\u4e2a term \u4e00\u81f4\u4e86\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>4. \u5982\u679c\u81ea\u5df1\u5df2\u7ecf\u4e0d\u662f Leader -&gt; \u8fd4\u56de<\/li>\n\n\n\n<li>5. \u68c0\u67e5 <code>reply-&gt;success()<\/code>\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u662f <code>false<\/code>\uff1a\u8868\u793a\u4e0e\u8be5 follower \u7684\u65e5\u5fd7\u4e0d\u5339\u914d \u2192 \u8bf4\u660e\u5b83\u6bd4 leader \u843d\u540e \u2192 leader \u9700\u8981\u4e0d\u65ad\u5012\u9000\u91cd\u8bd5\u627e\u5230\u5171\u540c\u524d\u7f00\uff08\u5339\u914d\u70b9\uff09 \u2192 \u7136\u540e\u4e00\u6b21\u6027\u628a\u5269\u4e0b\u7684\u65e5\u5fd7\u590d\u5236\u8fc7\u53bb\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u662f <code>true<\/code>\uff1a\u8868\u793a\u65e5\u5fd7\u5339\u914d\uff0c\u66f4\u65b0 <code>matchIndex<\/code> \u548c <code>nextIndex<\/code>\uff0c\u5e76 <code>*appendNums++<\/code>\uff0c\u8868\u793a\u6709\u4e00\u4e2a follower \u540c\u6b65\u6210\u529f\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>6. \u68c0\u67e5\u63d0\u4ea4\u6761\u4ef6\n<ul class=\"wp-block-list\">\n<li>\u6761\u4ef6\u4e00\uff1a\u8d85\u8fc7\u534a\u6570 follower \u6210\u529f\u590d\u5236\uff08<code>*appendNums &gt;= 1 + m_peers.size() \/ 2<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u6761\u4ef6\u4e8c\uff1a<code>entries_size &gt; 0<\/code>\uff1a\u786e\u4fdd\u4e0d\u662f\u7a7a\u5fc3\u8df3\u3002<\/li>\n\n\n\n<li>\u6761\u4ef6\u4e09\uff1a\u8981\u63d0\u4ea4\u7684\u65e5\u5fd7\u6761\u76ee\u7684 term \u4e0e\u5f53\u524d leader \u7684 term \u76f8\u7b49\u3002\n<ul class=\"wp-block-list\">\n<li>Raft \u534f\u8bae\u660e\u786e\u89c4\u5b9a\uff1a\u53ea\u6709\u5f53\u524d\u4efb\u671f\u7684\u65e5\u5fd7\u6761\u76ee\u624d\u80fd\u88ab Leader \u63d0\u4ea4\u3002<\/li>\n\n\n\n<li>\u4e4b\u524d term \u7684\u65e5\u5fd7\u6761\u76ee\uff0c\u5373\u4f7f\u88ab\u591a\u6570\u590d\u5236\u4e86\uff0c\u4e5f\u4e0d\u80fd\u5355\u72ec\u88ab\u63d0\u4ea4\uff0c\u5fc5\u987b\u548c\u5f53\u524d term \u7684\u65e5\u5fd7\u4e00\u8d77\u88ab\u63d0\u4ea4\u3002<\/li>\n\n\n\n<li>\u539f\u56e0\uff1a\u9632\u6b62\u4e00\u4e2a\u8001 Leader \u5728\u65e7\u4efb\u671f\u4e0b\u63d0\u4ea4\u4e86\u65e0\u6cd5\u4fdd\u8bc1\u5b89\u5168\u6027\u7684\u65e5\u5fd7\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>ps\uff1a\u5f53\u7136 leader \u7684 term \u4e0e\u8be5 follower \u7684\u76f8\u7b49\u3001\u65e5\u5fd7\u5339\u914d\u6210\u529f\u3001\u5f53\u524d\u8eab\u4efd\u662f leader \u8fd9\u4e9b\u4e5f\u7b97\u6761\u4ef6\uff0c\u4e0d\u8fc7\u5df2\u7ecf\u5728\u524d\u9762\u8fc7\u6ee4\u8fc7\u4e86\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>7. commit \u63d0\u4ea4\uff08\u5373\u66f4\u65b0 <code>m_commitIndex<\/code>\uff09<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>AppendEntries1()<\/strong><\/code>\uff1a\u63a5\u6536 Leader \u53d1\u9001\u7684\u65e5\u5fd7\u8bf7\u6c42 RPC\uff0c\u68c0\u67e5\u5f53\u524d\u65e5\u5fd7\u662f\u5426\u5339\u914d\u5e76\u8fdb\u884c\u540c\u6b65\u3002\n<ul class=\"wp-block-list\">\n<li>1. \u63a5\u6536\u8bf7\u6c42\uff0c\u8bbe\u7f6e\u56de\u590d RPC \u7684\u521d\u59cb\u72b6\u6001\n<ul class=\"wp-block-list\">\n<li><code>reply-&gt;set_appstate(AppNormal);<\/code><\/li>\n\n\n\n<li>follower \u5df2\u7ecf\u6536\u5230\u4e86 leader \u7684\u8bf7\u6c42\uff0c\u8bf4\u660e\u5f53\u524d\u80fd\u6b63\u5e38\u63a5\u6536\u8bf7\u6c42\uff08\u7f51\u7edc\u6b63\u5e38\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>2. Term \u68c0\u67e5\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c leader \u7684 term \u6bd4\u81ea\u5df1\u5c0f\uff0c\u5219\u62d2\u7edd\u8fc7\u671f leader \u7684\u8bf7\u6c42\u3002\u5c06\u8fd4\u56de\u72b6\u6001\u8bbe\u7f6e\u4e3a false\uff0c\u628a\u81ea\u5df1\u8f83\u65b0\u7684 term \u4f20\u7ed9 leader\uff0c\u76f4\u63a5\u8fd4\u56de\u3002<\/li>\n\n\n\n<li>\u5982\u679c leader \u7684 term \u6bd4\u81ea\u5df1\u5927\uff0c\u5219\u66f4\u65b0\u81ea\u5df1\u843d\u540e\u7684\u72b6\u6001\u3002\u4f46<strong>\u6ce8\u610f\u4e0d\u8981\u8fd4\u56de\uff0c\u56e0\u4e3a\u9047\u5230\u4e86\u5408\u6cd5\u7684 leader\uff0c\u8981\u5c1d\u8bd5\u540c\u6b65\u65e5\u5fd7\u3002<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f9d\u65e7\u4e09\u53d8.\/\n<ul class=\"wp-block-list\">\n<li>m_status = Follower; \/\/ Raft \u539f\u5219\uff1a\u53d1\u73b0\u4efb\u671f\u66f4\u9ad8\u7684\u8282\u70b9\uff0c\u7acb\u523b\u8f6c\u6362\u4e3a follower\uff08\u54ea\u6015\u672c\u6765\u5c31\u662f follower\uff09\u3002<\/li>\n\n\n\n<li>m_currentTerm = args-&gt;term(); \/\/ \u73b0\u5728\u4e8c\u8005\u7684 term \u4e00\u81f4\u4e86<\/li>\n\n\n\n<li>m_votedFor = -1; \/\/ \u5982\u679c\u7a81\u7136\u5b95\u673a\u7136\u540e\u4e0a\u7ebf\uff0c\u7406\u8bba\u4e0a\u662f\u53ef\u4ee5\u6295\u7968\u7684<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u4e4b\u540e\u7684\u903b\u8f91\u5c31\u90fd\u662f\u4e24\u8005 term \u4e00\u81f4\u7684\u60c5\u51b5\u4e86\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>3. \u8f6c\u53d8\u4e3a follower\uff08\u65e0\u8bba\u662f\u5426\u5df2\u662f\uff09\n<ul class=\"wp-block-list\">\n<li>\u5047\u8bbe\u5f53\u524d\u8282\u70b9\u662f candidate\uff0c\u5b83\u5728\u67d0\u4e2a term\uff08\u6bd4\u5982 term = 5\uff09\u53d1\u8d77\u4e86\u9009\u4e3e\uff0c\u5728\u9009\u7968\u672a\u96c6\u9f50\u4e4b\u524d\uff0c\u7f51\u7edc\u4e2d\u53e6\u4e00\u4e2a\u8282\u70b9\u4e5f\u5728 term = 5 \u6210\u529f\u6210\u4e3a\u4e86 leader\uff0c\u5e76\u5f00\u59cb\u53d1 <code>AppendEntries<\/code>\u3002\u4e8e\u662f\u8fd9\u4e2a candidate \u8282\u70b9\u6536\u5230\u8be5 leader \u7684 AE \u8bf7\u6c42\u540e\uff0c\u5c31\u8981\u4e3b\u52a8\u9000\u4f4d\u4e3a follower\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>4. \u91cd\u7f6e\u9009\u4e3e\u8d85\u65f6\n<ul class=\"wp-block-list\">\n<li>m_lastResetElectionTime = now();<\/li>\n\n\n\n<li>\u56e0\u4e3a\u76f8\u5f53\u4e8e\u6536\u5230\u4e86\u5fc3\u8df3\uff0c\u5f97\u77e5\u4e86 leader \u7684\u5b58\u5728\uff0c\u6682\u65f6\u4e0d\u7528\u9009\u4e3e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>5. \u524d\u7f6e\u65e5\u5fd7\u5339\u914d\u6027\u68c0\u67e5\uff08PrevLogIndex\uff09\n<ul class=\"wp-block-list\">\n<li>\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u4ece <code>PrevLogIndex<\/code> \u622a\u65ad\u65e5\u5fd7\uff1f\u4e00\u662f\u7531\u4e8e\u7f51\u7edc\u5ef6\u8fdf\uff0c\u53ef\u80fd\u6536\u5230\u7684\u662f\u65e7 Leader \u53d1\u6765\u7684\u8fc7\u671f RPC\uff1b\u4e8c\u662f\u65e5\u5fd7\u524d\u534a\u5339\u914d\uff0c\u540e\u534a\u51b2\u7a81\u7684\u60c5\u51b5\u3002<\/li>\n\n\n\n<li>\u60c5\u51b5\u4e00\uff1a<code>args-&gt;prevlogindex() &gt; getLastLogIndex()<\/code>\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u8868\u793a\u6211\uff08follower\uff09\u53ea\u4fdd\u5b58\u5230\u4e86 <code>getLastLogIndex()<\/code>\uff0c\u4f60\uff08leader\uff09\u81f3\u5c11\u8981\u4ece\u8fd9\u4e2a\u7d22\u5f15\u4e4b\u540e\u7684\u4f4d\u7f6e\u5f00\u59cb\u540c\u6b65\u6570\u636e\u3002\u201c\u56de\u9000\u201d\u7684\u903b\u8f91\u662f\u5728 leader \u7aef\u5b8c\u6210\u7684\uff0cfollower \u53ea\u9700\u8981\u544a\u8bc9 leader \u6211\u5230\u54ea\u91cc\u4e86\u3002<\/li>\n\n\n\n<li>\u56e0\u6b64 <code>reply-&gt;set_updatenextindex(getLastLogIndex() + 1)<\/code> \u5e76\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u60c5\u51b5\u4e8c\uff1a<code>args-&gt;prevlogindex() &lt; m_lastSnapshotIncludeIndex<\/code>\n<ul class=\"wp-block-list\">\n<li>prevlogIndex \u5c0f\u4e8e\u672c\u5730\u5feb\u7167\u7684\u6700\u540e\u4e00\u4e2a\u65e5\u5fd7\u7d22\u5f15\uff0c\u8bf4\u660e leader \u53d1\u9001\u7684\u65e5\u5fd7\u592a\u65e7\uff0c\u5df2\u7ecf\u4e0d\u5b58\u5728\u4e86\u3002<\/li>\n\n\n\n<li>\u56e0\u6b64 <code>reply-&gt;set_updatenextindex(m_lastSnapshotIncludeIndex + 1)<\/code>\u5e76\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u4e0b\u9762\u7684\u903b\u8f91\u5c31\u662f\u5df2\u7ecf\u627e\u5230\u5339\u914d\u70b9\u4e86\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>6. matchLog() == true\n<ul class=\"wp-block-list\">\n<li>\u5373 Follower \u7f3a\u5931\u7684\u7b2c\u4e00\u4e2a\u65e5\u5fd7\u6761\u76ee\u7684\u524d\u4e00\u4e2a\u6761\u76ee\u5728\u672c\u5730\u5b58\u5728\u4e14 term \u4e0e Leader \u7684 entry term \u4e00\u81f4<\/li>\n\n\n\n<li>\u2460\u904d\u5386 Leader \u53d1\u6765\u7684\u65b0\u65e5\u5fd7\u6761\u76ee\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u672c\u5730\u65e5\u5fd7\u4e2d\u5df2\u7ecf\u6709\u8be5 index \u4e14 term \u4e00\u81f4\uff0c\u5219\u8df3\u8fc7\uff1b<\/li>\n\n\n\n<li>\u5982\u679c term \u4e0d\u4e00\u81f4\uff0c\u5219\u66ff\u6362\u4e3a Leader \u7684\u65e5\u5fd7\uff08Raft \u8981\u6c42 index \u76f8\u540c\u7684\u65e5\u5fd7\u5fc5\u987b\u5b8c\u5168\u76f8\u540c\uff09\uff1b<\/li>\n\n\n\n<li>\u5982\u679c\u672c\u5730\u8fd8\u6ca1\u6709\u5bf9\u5e94\u7684\u65e5\u5fd7 index\uff0c\u76f4\u63a5\u8ffd\u52a0\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u2461commitIndex \u540c\u6b65\n<ul class=\"wp-block-list\">\n<li>\u540c\u6b65 Leader \u7684\u63d0\u4ea4\u8fdb\u5ea6\uff0c\u4e0d\u80fd\u8d85\u8fc7 Leader \u7684\u63d0\u4ea4\u4f4d\u7f6e\u548c\u672c\u5730\u6700\u540e\u65e5\u5fd7\u4f4d\u7f6e\u3002<\/li>\n\n\n\n<li><code>m_commitIndex = std::min(args-&gt;leadercommit(), getLastLogIndex());<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u2462\u8bbe\u7f6e\u6210\u529f\u54cd\u5e94\n<ul class=\"wp-block-list\">\n<li><code>reply-&gt;set_success(true);<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>7. matchLog() == false\n<ul class=\"wp-block-list\">\n<li>\u8868\u793a Follower \u5728 <code>PrevLogIndex<\/code> \u7684\u65e5\u5fd7\u6761\u76ee\u5728\u672c\u5730\u5b58\u5728\uff0c\u4f46 term \u548c Leader \u7684\u8fd9\u4e00\u6761\u76ee term \u4e0d\u4e00\u81f4\uff0c\u8bf4\u660e\u5b83\u4eec\u7684\u65e5\u5fd7\u5728\u6b64\u4e4b\u524d\u5df2\u7ecf\u4ea7\u751f\u5206\u6b67\uff08\u6bd4\u5982 leader \u63a5\u6536\u4e86\u65e5\u5fd7\u6761\u76ee\u540e\u9a6c\u4e0a\u5b95\u673a\uff09\uff0c\u9700\u8981\u8fdb\u884c\u65e5\u5fd7\u56de\u9000\u3002<\/li>\n\n\n\n<li>\u51b2\u7a81\u5904\u7406\uff1a\u56de\u9000\u5230 <code>PrevLogIndex<\/code> \u6240\u5728\u4efb\u671f\u7684\u7b2c\u4e00\u4e2a\u6761\u76ee\uff0c\u5feb\u901f\u56de\u9000\u8df3\u8fc7\u6574\u4e2a term \u6bb5\uff0c\u800c\u4e0d\u662f\u4e00\u6761\u4e00\u6761\u51cf\uff0c\u8d77\u5230\u4e00\u4e2a\u52a0\u901f\u7684\u6548\u679c\u3002<\/li>\n\n\n\n<li>Follower \u4f1a\u901a\u77e5 Leader\uff1a\u8bf7\u4ece\u4f60\u8fd9\u4e00 term \u7684\u7b2c\u4e00\u6761\u65e5\u5fd7\u540e\u5f00\u59cb\u53d1\u5e76\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>AppendEntries()<\/strong><\/code>\uff1aRPC \u63a5\u53e3\u51fd\u6570\uff0c\u800c\u4e0a\u9762\u7684<code> <code>AppendEntries1()<\/code><\/code>\u7528\u4e8e\u5904\u7406\u4e1a\u52a1\u903b\u8f91\uff0c\u505a\u5230\u4e86\u89e3\u8026\u3002\n<ul class=\"wp-block-list\">\n<li><code>done-&gt;Run()<\/code> \u662f\u4e00\u4e2a\u56de\u8c03\uff0c\u5b83\u7684\u4f5c\u7528\u662f AppendEntries RPC \u8c03\u7528\u5b8c\u6210\u540e\uff0c\u901a\u77e5 RPC \u6846\u67b6\u201c\u6211\u5df2\u7ecf\u5904\u7406\u5b8c\u8fd9\u4e2a\u8bf7\u6c42\u4e86\uff0c\u53ef\u4ee5\u8fd4\u56de response \u7ed9\u5bf9\u65b9\u4e86\u201d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>leaderSendSnapShot()<\/strong><\/code>\uff1aLeader \u5411 Follower \u53d1\u9001\u5feb\u7167 RPC\uff0c\u5728\u53d1\u9001\u5b8c\u540e\u8fd8\u9700\u8981\u8d1f\u8d23\u63a5\u6536\u5e76\u5904\u7406\u5bf9\u7aef\u53d1\u9001\u56de\u6765\u7684\u54cd\u5e94\u3002\n<ul class=\"wp-block-list\">\n<li>Leader \u5728\u53d1\u73b0\u67d0\u4e2a follower \u843d\u540e\u592a\u591a\uff08\u5373 follower \u7684 <code>nextIndex<\/code> \u5c0f\u4e8e Leader \u7ef4\u62a4\u7684 <code>lastSnapshotIncludeIndex<\/code>\uff0c\u4e5f\u5c31\u662f\u5feb\u7167\u4e2d\u6700\u540e\u4e00\u4e2a\u65e5\u5fd7\u6761\u76ee\u7684 index\uff09\uff0cLeader \u5c31\u4f1a\u8c03\u7528\u8be5\u51fd\u6570\uff0c\u5411\u8be5 follower \u53d1\u9001\u5feb\u7167\u4ee5\u4fbf\u5176\u80fd\u7ee7\u7eed\u8ffd\u4e0a Leader \u7684\u65e5\u5fd7\u3002<\/li>\n\n\n\n<li>\u4e1a\u52a1\u903b\u8f91\uff1a\n<ul class=\"wp-block-list\">\n<li>1. \u6784\u9020\u8bf7\u6c42\u53c2\u6570 InstallSnapshotRequest args\u3002\u5305\u62ec\u5f53\u524d leader \u7684 id\u3001\u5f53\u524d\u4efb\u671f\u3001\u5feb\u7167\u7684\u6700\u540e\u4e00\u4e2a\u65e5\u5fd7\u6761\u76ee\u7684 index \u548c term\uff0c\u5e76\u4ece\u6301\u4e45\u5316\u7ec4\u4ef6\u4e2d\u8bfb\u51fa\u5feb\u7167\u6570\u636e\u3002<\/li>\n\n\n\n<li>2. \u8c03\u7528\u6307\u5b9a <code>server<\/code> \u8282\u70b9\u7684 InstallSnapshot \u63a5\u53e3\uff0c\u53d1\u9001 RPC \u5feb\u7167\u3002\u6ce8\u610f\u5728\u53d1\u9001 RPC \u524d\u91ca\u653e\u9501\uff0c\u907f\u514d\u963b\u585e\u5176\u4ed6\u7ebf\u7a0b\u3002<\/li>\n\n\n\n<li>3. \u91cd\u65b0\u52a0\u9501\uff0c\u5e76\u8bbe\u7f6e DEFER \u5b8f\u4ee5\u81ea\u52a8\u91ca\u653e\uff0c\u786e\u4fdd\u65e0\u8bba\u540e\u7eed\u600e\u4e48 return\uff0c\u9501\u90fd\u4f1a\u91ca\u653e\uff0c\u662f\u4e00\u79cd\u8d44\u6e90\u7ba1\u7406\u7b56\u7565\u3002<\/li>\n\n\n\n<li>4. \u5065\u58ee\u6027\u68c0\u67e5\uff1a\u4e00\u662f RPC \u662f\u5426\u8c03\u7528\u6210\u529f\uff0c\u4e8c\u662f\u68c0\u67e5\u81ea\u5df1\u8fd8\u662f\u4e0d\u662f Leader \u548c\u81ea\u5df1\u7684 term \u662f\u5426\u88ab\u66f4\u65b0\u8fc7\uff0c\u5982\u679c\u88ab\u66f4\u65b0\u76f4\u63a5\u8fd4\u56de\u3002<\/li>\n\n\n\n<li>5. \u5982\u679c\u8fd4\u56de\u7684 follower term \u6bd4\u81ea\u5df1\u5927\uff0c\u90a3\u4e48\u5c31\u5c06\u81ea\u5df1\u7684\u8eab\u4efd\u8f6c\u4e3a Follower\uff0c\u66f4\u65b0\u81ea\u5df1\u7684 term \u5e76\u91cd\u7f6e\u9009\u4e3e\u72b6\u6001\uff08\u4f9d\u65e7\u4e09\u53d8\uff09\uff0c\u66f4\u65b0\u5b8c\u8fd8\u8981\u505a\u6301\u4e45\u5316\u5904\u7406\u3002<\/li>\n\n\n\n<li>6. \u5feb\u7167\u53d1\u9001\u6210\u529f\u540e\u66f4\u65b0 leader \u5bf9\u8be5 follower \u7ef4\u62a4\u7684\u72b6\u6001\uff1a\n<ul class=\"wp-block-list\">\n<li><code>m_matchIndex[server] = args.lastsnapshotincludeindex();<\/code><\/li>\n\n\n\n<li><code>m_nextIndex[server] = m_matchIndex[server] + 1;<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code><strong>InstallSnapshot()<\/strong><\/code>\uff1aRPC \u63a5\u53e3\u51fd\u6570\uff0c\u4e0a\u9762\u7684<code> <code><code>leaderSendSnapShot()<\/code><\/code><\/code> \u7528\u4e8e\u5904\u7406\u53d1\u9001\u5feb\u7167\u7684\u4e1a\u52a1\u903b\u8f91\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5b9a\u65f6\u5668<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Raft \u5411\u72b6\u6001\u673a\u5b9a\u65f6\u5199\u5165\uff1aapplierTicker()<\/li>\n\n\n\n<li>\u5fc3\u8df3\u53d1\u9001\u5b9a\u65f6\u5668\uff1aleaderHearBeatTicker()<\/li>\n\n\n\n<li>\u9009\u4e3e\u8d85\u65f6\u5b9a\u65f6\u5668\uff1aelectionTimeOutTicker()<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e09\u4e2a\u5b9a\u65f6\u5668\u9700\u8981\u4e09\u4e2a\u7ebf\u7a0b\uff0c\u540e\u6539\u6210\u4e24\u4e2a<strong>\u534f\u7a0b<\/strong>+\u4e00\u4e2a\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">main\u51fd\u6570<\/h3>\n\n\n\n<p>\u5728 example \u76ee\u5f55\u4e2d\uff0c\u542f\u52a8\u652f\u6301\u4e24\u4e2a\u547d\u4ee4\u884c\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>-n<\/code>\uff1a\u96c6\u7fa4\u8282\u70b9\u6570<\/li>\n\n\n\n<li><code>-f<\/code>\uff1aRaft \u8282\u70b9\u914d\u7f6e\u6587\u4ef6\uff08\u7528\u4e8e\u901a\u4fe1\u5730\u5740\u8bb0\u5f55\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8b\uff1a<code>.\/raftCoreRun -n 3 -f test.conf<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-24.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"972\" height=\"613\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-24.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-3148\"  sizes=\"auto, (max-width: 972px) 100vw, 972px\" \/><\/div><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-25.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1010\" height=\"688\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-25.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-3149\"  sizes=\"auto, (max-width: 1010px) 100vw, 1010px\" \/><\/div><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">\u6301\u4e45\u5316<\/h3>\n\n\n\n<p>\u5373\u628a\u4e0d\u80fd\u4e22\u5931\u7684\u6570\u636e\u4fdd\u5b58\u5230\u78c1\u76d8\u3002<\/p>\n\n\n\n<p><strong>\u6301\u4e45\u5316\u7684\u5185\u5bb9\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>raft\u8282\u70b9\u7684\u90e8\u5206\u4fe1\u606f\n<ul class=\"wp-block-list\">\n<li>m currentTerm\uff1a\u5f53\u524d\u8282\u70b9\u7684 Term\uff0c\u907f\u514d\u91cd\u590d\u5230\u4e00\u4e2a Term\uff0c\u53ef\u80fd\u9047\u5230\u91cd\u590d\u6295\u7968\u7b49\u95ee\u9898\u3002<\/li>\n\n\n\n<li>m_votedFor\uff1a\u5f53\u524d Term \u7ed9\u8c01\u6295\u8fc7\u7968\uff0c\u907f\u514d\u6545\u969c\u540e\u91cd\u590d\u6295\u7968\u3002<\/li>\n\n\n\n<li>m_logs\uff1araft \u8282\u70b9\u4fdd\u5b58\u7684\u5168\u90e8\u65e5\u5fd7\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>kvDb\u7684\u5feb\u7167\n<ul class=\"wp-block-list\">\n<li>m_lastSnapshotlncludelndex\uff1a\u5feb\u7167\u7684\u4fe1\u606f\uff0c\u5feb\u7167\u6700\u65b0\u5305\u542b\u62ff\u8fc7\u65e5\u5fd7 index\u3002<\/li>\n\n\n\n<li>m_lastSnapshotIncludeTerm\uff1a\u5feb\u7167\u7684\u4fe1\u606f\uff0c\u5feb\u7167\u6700\u65b0\u5305\u542b\u54ea\u4e2a\u65e5\u5fd7 Term\uff0c\u4e0e m_ lastSnapshotIncludelndex \u662f\u5bf9\u5e94\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>\u6301\u4e45\u5316\u7684\u539f\u56e0\uff1a<\/strong><\/p>\n\n\n\n<p>\u5171\u8bc6\u5b89\u5168\u548c\u4f18\u5316\uff0c\u9664\u4e86 snapshot \u76f8\u5173\u7684\u90e8\u5206\uff0c\u5176\u4ed6\u90e8\u5206\u90fd\u662f\u4e3a\u4e86\u5171\u8bc6\u5b89\u5168\u3002<br>\u65e5\u5fd7\u4e00\u4e2a\u4e00\u4e2a\u53e0\u52a0\uff0c\u4f1a\u5bfc\u81f4\u6700\u540e\u7684\u5b58\u50a8\u975e\u5e38\u5927\uff0c\u56e0\u6b64\u4f7f\u7528 snapshot \u6765\u538b\u7f29\u65e5\u5fd7\u3002<\/p>\n\n\n\n<p>ps\uff1asnapshot \u53ef\u4ee5\u538b\u7f29\u65e5\u5fd7\u662f\u56e0\u4e3a\u65e5\u5fd7\u662f\u8ffd\u52a0\u5199\u7684\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u53d8\u91cf\u7684\u91cd\u590d\u4fee\u6539\u53ef\u80fd\u4f1a\u91cd\u590d\u4fdd\u5b58\uff0c\u5bfc\u81f4\u65e5\u5fd7\u5b58\u4e86\u4e00\u4e9b\u65e0\u7528\u7684\u5185\u5bb9\uff0c\u7a7a\u95f4\u4e0d\u65ad\u589e\u5927\u3002\u4f46\u7406\u8bba\u4e0a\u53ea\u4fdd\u5b58\u4e00\u4e2a\u53d8\u91cf\u6700\u540e\u90a3\u6b21\u4fee\u6539\u540e\u7684\u503c\u5373\u53ef\uff0csnapshot \u662f\u539f\u5730\u5199\uff0c\u7a7a\u95f4\u81ea\u7136\u5c31\u51cf\u5c0f\u4e86\u3002<\/p>\n\n\n\n<p><strong>\u6301\u4e45\u5316\u7684\u65f6\u95f4\u8282\u70b9\uff1a<\/strong><\/p>\n\n\n\n<p>\u9700\u8981\u6301\u4e45\u5316\u7684\u5185\u5bb9\u53d1\u751f\u6539\u53d8\u7684\u65f6\u5019\u5c31\u8981\u6ce8\u610f\u6301\u4e45\u5316\uff0c\u6bd4\u5982 term \u589e\u52a0\u3001\u65e5\u5fd7\u589e\u52a0\u7b49\u7b49\u3002<\/p>\n\n\n\n<p><strong>\u8c01\u8d1f\u8d23\u8c03\u7528\u6301\u4e45\u5316\uff1a<\/strong><\/p>\n\n\n\n<p>\u8c01\u6765\u8c03\u7528\u90fd\u53ef\u4ee5\uff0c\u53ea\u8981\u80fd\u4fdd\u8bc1\u9700\u8981\u6301\u4e45\u5316\u7684\u5185\u5bb9\u80fd\u6b63\u786e\u6301\u4e45\u5316\u5373\u53ef\u3002\u672c\u9879\u76ee\u9009\u62e9\u7684\u662f raft \u7c7b\u81ea\u5df1\u6765\u5b8c\u6210\u6301\u4e45\u5316\uff0c\u56e0\u4e3a raft \u7c7b\u6700\u65b9\u4fbf\u611f\u77e5\u81ea\u5df1\u7684 term \u4e4b\u7c7b\u7684\u4fe1\u606f\u6709\u6ca1\u6709\u53d8\u5316\u3002<br>ps\uff1a\u867d\u7136\u6301\u4e45\u5316\u5f88\u8017\u65f6\uff0c\u4f46\u662f\u6301\u4e45\u5316\u8fd9\u4e9b\u5185\u5bb9\u7684\u65f6\u5019\u4e0d\u8981\u653e\u5f00\u9501\uff0c\u9632\u6b62\u5176\u4ed6\u7ebf\u7a0b\u6539\u53d8\u4e86\u8fd9\u4e9b\u503c\uff0c\u5bfc\u81f4\u5f02\u5e38\u3002<\/p>\n\n\n\n<p><strong>\u5177\u4f53\u600e\u4e48\u5b9e\u73b0\u6301\u4e45\u5316\uff1a<\/strong><br>\u6301\u4e45\u5316\u662f\u4e00\u4e2a\u975e\u5e38\u96be\u7684\u4e8b\u60c5\uff0c\u56e0\u4e3a\u6301\u4e45\u5316\u9700\u8981\u8003\u8651\uff1a\u901f\u5ea6\u3001\u5927\u5c0f\u548c\u4e8c\u8fdb\u5236\u5b89\u5168\u3002\u672c\u9879\u76ee\u76ee\u524d\u91c7\u7528\u7684\u662f\u4f7f\u7528 boost \u5e93\u4e2d\u7684\u6301\u4e45\u5316\u5b9e\u73b0\uff0c\u5c06\u9700\u8981\u6301\u4e45\u5316\u7684\u6570\u636e\u8f6c\u5316\u6210 std::string \u7c7b\u578b\u518d\u5199\u5165\u5230\u78c1\u76d8\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>std::string Raft::persistData() {<br>    BoostPersistRaftNode boostPersistRaftNode;<br>    boostPersistRaftNode.m_currentTerm = m_currentTerm;<br>    boostPersistRaftNode.m_votedFor = m_votedFor;<br>    boostPersistRaftNode.m_lastSnapshotIncludeIndex = m_lastSnapshotIncludeIndex;<br>    boostPersistRaftNode.m_lastSnapshotIncludeTerm = m_lastSnapshotIncludeTerm;<br>    for (auto&amp; item : m_logs) {<br>        boostPersistRaftNode.m_logs.push_back(item.SerializeAsString());<br>    }<br><br>    std::stringstream ss;<br>    boost::archive::text_oarchive oa(ss);<br>    oa &lt;&lt; boostPersistRaftNode;<br>    return ss.str();<br>}<br><\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">kvServer<\/h2>\n\n\n\n<p>\u76f8\u5f53\u4e8e\u662f\u4e2a\u4e2d\u95f4\u7ec4\u4ef6\uff0c\u8d1f\u8d23\u6c9f\u901a kvDB \u548c raft \u8282\u70b9\u3002<\/p>\n\n\n\n<p>kvServer \u901a\u8fc7\u4e0b\u9762<strong>\u4e24\u4e2a\u53d8\u91cf<\/strong>\u5b9e\u73b0\u4e0e\u4e0a\u5c42\u7684 kvDB \u548c\u4e0b\u5c42\u7684 raft \u8282\u70b9\u6c9f\u901a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>std::shared_ptr&lt;LockQueue&lt;ApplyMsg&gt;&gt; applyChan;  \/\/ kvServer \u548c raft \u8282\u70b9\u7684\u901a\u4fe1\u7ba1\u9053\nstd::unordered_map&lt;std::string, std::string&gt; m_kvDB; \/\/ \u7528unordered map\u6765\u66ff\u4ee3 kv \u6570\u636e\u5e93<\/code><\/pre>\n\n\n\n<p>kvServer \u548c raft \u7c7b\u4e2d\u5404\u6301\u6709\u4e00\u4e2a applyChan\uff0c\u6765\u5b8c\u6210\u76f8\u4e92\u7684\u901a\u4fe1\u3002\u5176\u4e2d LockQueue \u662f\u4e00\u4e2a\u5e76\u53d1\u7684\u5b89\u5168\u961f\u5217\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5176\u5b9e\u662f\u6a21\u4eff\u7684 golang \u4e2d channel \u673a\u5236\u3002<\/p>\n\n\n\n<p><strong>kvServer \u5904\u7406\u5916\u90e8\u8bf7\u6c42\u7684\u6b65\u9aa4\uff1a<\/strong><\/p>\n\n\n\n<p>\u4ece\u4e0b\u9762\u7ed3\u6784\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa kvServer \u8d1f\u8d23\u4e0e\u5916\u90e8\u7684 clerk\uff08\u5ba2\u6237\u7aef\uff09\u901a\u4fe1\uff0c\u4e00\u4e2a\u5916\u90e8\u8bf7\u6c42\u7684\u5904\u7406\u53ef\u4ee5\u7b80\u5355\u5730\u770b\u6210\u4e09\u6b65\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u63a5\u6536\u5916\u90e8\u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>\u672c\u673a\u5185\u90e8\u4e0e raft \u548c kvDB \u534f\u5546\u5982\u4f55\u5904\u7406\u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>\u8fd4\u56de\u5916\u90e8\u54cd\u5e94\u3002<\/li>\n<\/ol>\n\n\n\n<p><br>\u5176\u4e2d\uff0c\u7b2c\u4e00\u6b65\u548c\u7b2c\u4e09\u6b65\u4f7f\u7528\u4e2a\u4eba\u5b8c\u6210\u7684 RPC \u5b8c\u6210\u3002<\/p>\n\n\n\n<p>\u76f8\u5173\u51fd\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void PutAppend(google::protobuf::RpcController *controller, const ::raftKVRpcProctoc::PutAppendArgs *request, ::raftKVRpcProctoc::PutAppendReply *response, ::google::protobuf::Closure *done) override;\n\nvoid Get(google::protobuf::RpcController *controller, const ::raftKVRpcProctoc::GetArgs *request, ::raftKVRpcProctoc::GetReply *response, ::google::protobuf::Closure *done) override;<\/code><\/pre>\n\n\n\n<p>\u987e\u540d\u601d\u4e49\uff0c\u8bf7\u6c42\u5206\u6210\u4e24\u79cd\uff1aget \u548c put\uff08\u4e5f\u5c31\u662fset\uff09\u3002<br>\u5982\u679c\u662f putAppend\uff0cclerk \u4e2d\u5c31\u8c03\u7528 PutAppend \u7684 rpc\uff1b\u5982\u679c\u662f Get\uff0cclerk \u4e2d\u5c31\u8c03\u7528 Get \u7684 rpc\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-11.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"896\" height=\"594\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-11.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2984\"  sizes=\"auto, (max-width: 896px) 100vw, 896px\" \/><\/div><\/figure>\n<\/div>\n\n\n<p class=\"has-text-align-center\"><em>ps\uff1araftServer \u7b49\u540c\u4e8e\u4e0a\u8ff0\u7684 kvServer<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u7ebf\u6027\u4e00\u81f4\u6027<\/h2>\n\n\n\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000022248118#item-1\">https:\/\/segmentfault.com\/a\/1190000022248118#item-1<\/a><\/p>\n\n\n\n<p>\u5f3a\u4e00\u81f4\u6027\u548c\u5f31\u4e00\u81f4\u6027\u53ea\u662f\u4e00\u79cd\u7edf\u79f0\uff0c\u6309\u7167\u4ece\u5f3a\u5230\u5f31\uff0c\u53ef\u4ee5\u5212\u5206\u4e3a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7ebf\u6027\u4e00\u81f4\u6027Linearizability consistency \uff0c\u4e5f\u53eb\u539f\u5b50\u6027<\/li>\n\n\n\n<li>\u987a\u5e8f\u4e00\u81f4\u6027 Sequential consistency<\/li>\n\n\n\n<li>\u56e0\u679c\u4e00\u81f4\u6027 Causal consistency<\/li>\n\n\n\n<li>\u6700\u7ec8\u4e00\u81f4\u6027 Eventual consistency<\/li>\n<\/ul>\n\n\n\n<p>\u5f3a\u4e00\u81f4\u6027\u5305\u62ec\u7ebf\u6027\u4e00\u81f4\u6027\u548c\u987a\u5e8f\u4e00\u81f4\u6027\uff0c\u5176\u4ed6\u7684\u90fd\u662f\u5f31\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p>\u5728\u5f3a\u4e00\u81f4\u6027\u96c6\u7fa4\u4e2d\uff0c\u5bf9\u4efb\u4f55\u4e00\u4e2a\u8282\u70b9\u53d1\u8d77\u8bf7\u6c42\u90fd\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u56de\u590d\uff0c\u4f46\u5c06\u4ea7\u751f\u76f8\u5bf9\u9ad8\u7684\u5ef6\u8fdf\u3002\u800c\u5f31\u4e00\u81f4\u6027\u5177\u6709\u66f4\u4f4e\u7684\u54cd\u5e94\u5ef6\u8fdf\uff0c\u4f46\u53ef\u80fd\u4f1a\u56de\u590d\u8fc7\u671f\u7684\u6570\u636e\uff0c\u6700\u7ec8\u4e00\u81f4\u6027\u5c31\u662f\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u540e\u7ec8\u4f1a\u5230\u8fbe\u4e00\u81f4\u7684\u5f31\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p><strong>\u4ec0\u4e48\u662f\u7ebf\u6027\u4e00\u81f4\u6027\uff1a<\/strong><\/p>\n\n\n\n<p>\u7ebf\u6027\u4e00\u81f4\u6027\u53c8\u88ab\u79f0\u4e3a\u5f3a\u4e00\u81f4\u6027\u3001\u4e25\u683c\u4e00\u81f4\u6027\u3001\u539f\u5b50\u4e00\u81f4\u6027\u3002\u662f\u7a0b\u5e8f\u80fd\u5b9e\u73b0\u7684\u6700\u9ad8\u7684\u4e00\u81f4\u6027\u6a21\u578b\uff0c\u4e5f\u662f\u5206\u5e03\u5f0f\u7cfb\u7edf\u7528\u6237\u6700\u671f\u671b\u7684\u4e00\u81f4\u6027\uff0cCAP \u4e2d\u7684 C \u4e00\u822c\u5c31\u6307\u5b83\u3002<\/p>\n\n\n\n<p>\u987a\u5e8f\u4e00\u81f4\u6027\u4e2d\u8fdb\u7a0b\u53ea\u5173\u5fc3\u5927\u5bb6\u8ba4\u540c\u7684\u987a\u5e8f\u4e00\u6837\u5c31\u884c\uff0c\u4e0d\u9700\u8981\u4e0e\u5168\u5c40\u65f6\u949f\u4e00\u81f4\uff0c\u7ebf\u6027\u5c31\u66f4\u4e25\u683c\uff0c\u4ece\u8fd9\u79cd\u504f\u5e8f\uff08partial order\uff09\u8981\u8fbe\u5230\u5168\u5e8f\uff08total order\uff09\u3002<\/p>\n\n\n\n<p>\u8981\u6c42\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1.\u4efb\u4f55\u4e00\u6b21\u8bfb\u90fd\u80fd\u8bfb\u5230\u67d0\u4e2a\u6570\u636e\u7684\u6700\u8fd1\u4e00\u6b21\u5199\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li>2.\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u770b\u5230\u7684\u64cd\u4f5c\u987a\u5e8f\uff0c\u90fd\u4e0e\u5168\u5c40\u65f6\u949f\u4e0b\u7684\u987a\u5e8f\u4e00\u81f4\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4e00\u4e2a\u7cfb\u5217\u7684\u6267\u884c\u5386\u53f2\u662f\u4e00\u7cfb\u5217\u7684\u5ba2\u6237\u8bf7\u6c42\uff0c\u6216\u8bb8\u8fd9\u662f\u6765\u81ea\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u591a\u4e2a\u8bf7\u6c42\u3002\u5982\u679c\u6267\u884c\u5386\u53f2\u6574\u4f53\u53ef\u4ee5\u6309\u7167\u4e00\u4e2a\u987a\u5e8f\u6392\u5217\uff0c\u4e14\u6392\u5217\u987a\u5e8f\u4e0e\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u5b9e\u9645\u65f6\u95f4\u76f8\u7b26\u5408\uff0c\u90a3\u4e48\u5b83\u5c31\u662f\u7ebf\u6027\u4e00\u81f4\u7684\u3002\u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u53d1\u51fa\u4e00\u4e2a\u8bf7\u6c42\uff0c\u5f97\u5230\u4e00\u4e2a\u54cd\u5e94\uff0c\u4e4b\u540e\u53e6\u4e00\u4e2a\u5ba2\u6237\u7aef\u53d1\u51fa\u4e00\u4e2a\u8bf7\u6c42\uff0c\u4e5f\u5f97\u5230\u54cd\u5e94\uff0c\u90a3\u4e48\u8fd9\u4e24\u4e2a\u8bf7\u6c42\u4e4b\u95f4\u662f\u6709\u987a\u5e8f\u7684\uff0c\u56e0\u4e3a\u4e00\u4e2a\u5728\u53e6\u4e00\u4e2a\u5b8c\u6210\u4e4b\u540e\u624d\u5f00\u59cb\u3002\u4e00\u4e2a\u7ebf\u6027\u4e00\u81f4\u7684\u6267\u884c\u5386\u53f2\u4e2d\u7684\u64cd\u4f5c\u662f\u975e\u5e76\u53d1\u7684\uff0c\u4e5f\u5c31\u662f\u65f6\u95f4\u4e0a\u4e0d\u91cd\u5408\u7684\u5ba2\u6237\u7aef\u8bf7\u6c42\u4e0e\u5b9e\u9645\u6267\u884c\u65f6\u95f4\u5339\u914d\u3002\u5e76\u4e14\uff0c\u6bcf\u4e2a\u8bfb\u64cd\u4f5c\u90fd\u770b\u5230\u6700\u8fd1\u4e00\u6b21\u5199\u5165\u7684\u503c\u3002<\/p>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\u5c31\u662f\uff0c\u975e\u5e76\u53d1\u7684\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u6267\u884c\u64cd\u4f5c\uff0c\u6b63\u597d\u6309\u7167\u8bf7\u6c42\u7684\u65f6\u95f4\u987a\u5e8f\u6267\u884c\uff0c\u6bcf\u4e2a\u64cd\u4f5c\u90fd\u53ef\u4ee5\u770b\u5230\u6700\u65b0\u7684\u5199\u5165\uff0c\u8fd9\u5c31\u662f\u7ebf\u6027\u4e00\u81f4\u3002\u5982\u679c\u4e00\u4e2a\u64cd\u4f5c\u5728\u53e6\u4e00\u4e2a\u64cd\u4f5c\u5f00\u59cb\u524d\u5c31\u7ed3\u675f\u4e86\uff0c\u90a3\u4e48\u8fd9\u4e2a\u64cd\u4f5c\u5728\u6267\u884c\u5386\u53f2\u4e2d\u5fc5\u987b\u51fa\u73b0\u5728\u53e6\u4e00\u4e2a\u64cd\u4f5c\u524d\u9762\u3002<br> <br>\u5bf9\u4e8e\u4e00\u4e2a\u64cd\u4f5c\u6765\u8bf4\uff0c\u4ece\u8bf7\u6c42\u53d1\u51fa\u5230\u6536\u5230\u56de\u590d\uff0c\u662f\u4e00\u4e2a\u65f6\u95f4\u6bb5\u3002\u56e0\u4e3a\u64cd\u4f5c\u4e2d\u5305\u542b\u4e86\u5f88\u591a\u6b65\u9aa4\uff0c\u81f3\u5c11\u5305\u542b\uff1a\u7f51\u7edc\u4f20\u8f93 \u2192 \u6570\u636e\u5904\u7406 \u2192 \u6570\u636e\u771f\u6b63\u5199\u5165\u6570\u636e\u5e93 \u2192 \u6570\u636e\u5904\u7406 \u2192 \u7f51\u7edc\u4f20\u8f93\u3002\u90a3\u4e48\u64cd\u4f5c\u771f\u6b63\u5b8c\u6210\uff08\u6570\u636e\u771f\u6b63\u5199\u5165\u6570\u636e\u5e93\uff09\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u65f6\u95f4\u70b9\uff0c\u64cd\u4f5c\u771f\u6b63\u5b8c\u6210\u53ef\u80fd\u53d1\u751f\u5728\u64cd\u4f5c\u65f6\u95f4\u6bb5\u7684\u4efb\u4f55\u4e00\u4e2a\u65f6\u95f4\u70b9\u3002<\/p>\n\n\n\n<p><strong>raft \u662f\u5982\u4f55\u505a\u5230\u7684\uff1a<\/strong><br>\u6bcf\u4e2a client \u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26 ClientId\uff0c\u5b83\u7684\u6bcf\u4e2a\u4e0d\u540c\u547d\u4ee4\u6709\u4e00\u4e2a\u987a\u5e8f\u9012\u589e\u7684 Commandld\uff0c\u8fd9\u4e24\u4e2a ID \u53ef\u4ee5\u552f\u4e00\u786e\u5b9a\u4e00\u4e2a\u4e0d\u540c\u7684\u547d\u4ee4\uff0c\u4ece\u800c\u4f7f\u5f97\u5404\u4e2a raft \u8282\u70b9\u53ef\u4ee5\u4fdd\u5b58\u5404\u547d\u4ee4\u662f\u5426\u5df2\u5e94\u7528\u4ee5\u53ca\u5e94\u7528\u4ee5\u540e\u7684\u7ed3\u679c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5bf9\u4e8e\u6bcf\u4e2a client\uff0c\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u6807\u8bc6\uff0c\u5bf9\u4e8e\u6bcf\u4e2a client\uff0c\u53ea\u6267\u884c\u9012\u589e\u7684\u547d\u4ee4\u3002<\/p>\n\n\n\n<p><strong>\u5728\u4fdd\u8bc1\u7ebf\u6027\u4e00\u81f4\u7684\u60c5\u51b5\u4e0b\u5982\u4f55\u5199 kv\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u901a\u8fc7\u8d85\u65f6 pop \u6765\u9650\u5b9a\u547d\u4ee4\u6267\u884c\u65f6\u95f4\uff0c\u5982\u679c\u8d85\u65f6\u65f6\u95f4\u5230\u4e86\u8fd8\u6ca1\u62ff\u5230\u6d88\u606f\uff0c\u8bf4\u660e\u547d\u4ee4\u6267\u884c\u8d85\u65f6\u4e86\nif (!chForRaftIndex-&gt;timeOutPop(CONSENSUS_TIMEOUT, &amp;raftCommitOp)) { \/\/ \u8d85\u65f6\u4e86\n    if (ifRequestDuplicate(op.ClientId, op.RequestId)) {\n        reply-&gt;set_err(OK);  \/\/ \u867d\u7136\u8d85\u65f6\u4e86,\u4f46\u56e0\u4e3a\u662f\u91cd\u590d\u7684\u8bf7\u6c42\uff0c\u6240\u4ee5\u8fd4\u56de ok\uff0c\u5c31\u7b97\u6ca1\u6709\u8d85\u65f6\uff0c\u5728\u771f\u6b63\u6267\u884c\u7684\u65f6\u5019\u4e5f\u8981\u5224\u65ad\u662f\u5426\u91cd\u590d\n    } else {\n        reply-&gt;set_err(ErrWrongLeader);  \/\/\/ \u8fd4\u56de\u6b64\u6d88\u606f\u7684\u76ee\u7684\u662f\u8ba9 clerk \u91cd\u65b0\u5c1d\u8bd5\n    }\n} else { \/\/ \u6ca1\u8d85\u65f6\uff0c\u547d\u4ee4\u53ef\u80fd\u771f\u6b63\u5730\u5728 raft \u96c6\u7fa4\u6210\u529f\u6267\u884c\u4e86\n    if (raftCommitOp.ClientId == op.ClientId &amp;&amp; raftCommitOp.RequestId == op.RequestId) {\n        \/\/ \u6709\u53ef\u80fd leader \u53d1\u751f\u53d8\u66f4\u5bfc\u81f4\u65e5\u5fd7\u88ab\u8986\u76d6\uff0c\u56e0\u6b64\u5fc5\u987b\u68c0\u67e5\n        reply-&gt;set_err(OK);\n    } else {\n        reply-&gt;set_err(ErrWrongLeader);\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u91cc\u7684\u547d\u4ee4\u6267\u884c\u6210\u529f\u6307\u7684\u662f\u672c\u6761\u547d\u4ee4\u5728\u6574\u4e2a raft \u96c6\u7fa4\u8fbe\u5230\u540c\u6b65\u7684\u72b6\u6001\uff0c\u800c\u4e0d\u662f\u4e00\u53f0\u673a\u5668\u4e0a\u7684 raft \u8282\u70b9\u4fdd\u5b58\u4e86\u8be5\u547d\u4ee4\u3002<\/p>\n\n\n\n<p><strong>\u5728\u4fdd\u8bc1\u7ebf\u6027\u4e00\u81f4\u7684\u60c5\u51b5\u4e0b\u5982\u4f55\u8bfb kv\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (!chForRaftIndex-&gt;timeOutPop(CONSENSUS_TIMEOUT, &amp;raftCommitOp)) { \/\/ \u8d85\u65f6\u4e86\n    int _ = -1;\n    bool isLeader = false;\n    m_raftNode-&gt;GetState(&amp;_, &amp;isLeader);\n\n    if (ifRequestDuplicate(op.ClientId, op.RequestId) &amp;&amp; isLeader) {\n    \/\/ \u8d85\u65f6\u4e86\u8bf4\u660e raft \u96c6\u7fa4\u4e0d\u4fdd\u8bc1\u5df2\u7ecf commitIndex \u8fc7\u8be5\u65e5\u5fd7\uff0c\u4f46\u662f\u5982\u679c\u662f\u5df2\u7ecf\u63d0\u4ea4\u8fc7\u7684 get \u8bf7\u6c42\uff0c\u662f\u53ef\u4ee5\u518d\u6267\u884c\u7684\uff0c\u4e0d\u4f1a\u8fdd\u53cd\u7ebf\u6027\u4e00\u81f4\u6027\n        std::string value;\n        bool exist = false;\n        ExecuteGetOpOnKVDB(op, &amp;value, &amp;exist);\n        if (exist) {\n            reply-&gt;set_err(OK);\n            reply-&gt;set_value(value);\n        } else {\n            reply-&gt;set_err(ErrNoKey);\n            reply-&gt;set_value(\"\");\n        }\n    } else {\n        reply-&gt;set_err(ErrWrongLeader);  \/\/ \u8fd4\u56de\u8be5\u4fe1\u606f\u7684\u76ee\u7684\u662f\u8ba9 clerk \u6362\u4e00\u4e2a\u8282\u70b9\u91cd\u8bd5\n    }\n} else { \/\/ \u6ca1\u8d85\u65f6\uff0c\u5373 raft \u5df2\u7ecf\u63d0\u4ea4\u4e86\u8be5 command\uff0c\u53ef\u4ee5\u6b63\u5f0f\u5f00\u59cb\u6267\u884c\u4e86\n    if (raftCommitOp.ClientId == op.ClientId &amp;&amp; raftCommitOp.RequestId == op.RequestId) {\n        std::string value;\n        bool exist = false;\n        ExecuteGetOpOnKVDB(op, &amp;value, &amp;exist);\n        if (exist) {\n            reply-&gt;set_err(OK);\n            reply-&gt;set_value(value);\n        } else {\n            reply-&gt;set_err(ErrNoKey);\n            reply-&gt;set_value(\"\");\n        }\n    } else {\n        reply-&gt;set_err(ErrWrongLeader);\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u8bfb\u4e0e\u5199\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0c\u8bfb\u5c31\u7b97\u5df2\u7ecf\u64cd\u4f5c\u8fc7\u4e86\u4e5f\u53ef\u4ee5\u91cd\u590d\u6267\u884c\uff0c\u4e0d\u4f1a\u8fdd\u53cd\u7ebf\u6027\u4e00\u81f4\u6027\uff0c\u56e0\u4e3a\u6bd5\u7adf\u4e0d\u4f1a\u6539\u53d8\u6570\u636e\u5e93\u672c\u8eab\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p><strong>\u4e0b\u9762\u4ee5 GET \u8bf7\u6c42\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2a\u8bfb\u64cd\u4f5c\u4e3a\u4f8b\u5b50\u770b\u4e00\u770b\u6d41\u7a0b\uff1a<\/strong><\/p>\n\n\n\n<p>\u9996\u5148\u662f\u5916\u90e8 RPC \u8c03\u7528 GET<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void KvServer::Get(google::protobuf::RpcController *controller, const ::raftKVRpcProctoc::GetArgs *request, ::raftKVRpcProctoc::GetReply *response, ::google::protobuf::Closure *done) {\n    KvServer::Get(request, response);\n    done-&gt;Run();\n}<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u662f\u5904\u7406\u6765\u81ea clerk \u7684 GET RPC\uff0c\u6839\u636e\u8bf7\u6c42\u53c2\u6570\u751f\u6210 Op\uff0c\u751f\u6210 Op \u7684\u539f\u56e0\u662f raft \u548c raftServer\uff08\u5373 kvServer\uff09\u6c9f\u901a\u7528\u7684\u662f\u7c7b\u4f3c\u4e8e go \u4e2d\u7684 channel \u673a\u5236\uff0c\u7136\u540e\u5411\u4e0b\u6267\u884c\u5373\u53ef\u3002\u6ce8\u610f\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u9700\u8981\u5224\u65ad\u5f53\u524d\u8282\u70b9\u662f\u4e0d\u662f leader\uff0c\u5982\u679c\u4e0d\u662f\u5c31\u8fd4\u56de ErrWrongLeader\uff0c\u8ba9 clerk \u6362\u4e00\u4e2a\u8282\u70b9\u5c1d\u8bd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void KvServer::Get(const raftKVRpcProctoc::GetArgs *args, raftKVRpcProctoc::GetReply *reply) {\n    Op op;\n    op.Operation = \"Get\";\n    op.Key = args-&gt;key();\n    op.Value = \"\";\n    op.ClientId = args-&gt;clientid();\n    op.RequestId = args-&gt;requestid();\n\n    int raftIndex = -1;\n    int _ = -1;\n    bool isLeader = false;\n    \/\/ raftIndex \u662f raft \u9884\u8ba1\u7684 logIndex\uff0c\u867d\u7136\u662f\u9884\u8ba1\uff0c\u4f46\u5728\u6b63\u786e\u60c5\u51b5\u4e0b\u662f\u51c6\u786e\u7684\uff0cop \u7684\u5177\u4f53\u5185\u5bb9\u5bf9 raft \u6765\u8bf4\u662f\u9694\u79bb\u7684\n    m_raftNode-&gt;Start(op, &amp;raftIndex, &amp;_, &amp;isLeader);  \n\n    if (!isLeader) {\n        reply-&gt;set_err(ErrWrongLeader);\n        return;\n    }\n\n    \/\/ create waitForCh\n    m_mtx.lock();\n\n    if (waitApplyCh.find(raftIndex) == waitApplyCh.end()) {\n        waitApplyCh.insert(std::make_pair(raftIndex, new LockQueue&lt;Op&gt;()));\n    }\n    auto chForRaftIndex = waitApplyCh&#91;raftIndex];\n\n    m_mtx.unlock();  \/\/ \u76f4\u63a5\u89e3\u9501\uff0c\u7b49\u5f85\u4efb\u52a1\u6267\u884c\u5b8c\u6210\uff0c\u4e0d\u80fd\u4e00\u76f4\u62ff\u9501\u7b49\u5f85\n\n    \/\/ timeout\n    Op raftCommitOp;\n\n    if (!chForRaftIndex-&gt;timeOutPop(CONSENSUS_TIMEOUT, &amp;raftCommitOp)) { \/\/ \u8d85\u65f6\u4e86\n        \/\/        DPrintf(\"&#91;GET TIMEOUT!!!]From Client %d (Request %d) To Server %d, key %v, raftIndex %d\",\n        \/\/        args.ClientId, args.RequestId, kv.me, op.Key, raftIndex)\n        \/\/ todo 2023\u5e7406\u670801\u65e5\n        int _ = -1;\n        bool isLeader = false;\n        m_raftNode-&gt;GetState(&amp;_, &amp;isLeader);\n\n        if (ifRequestDuplicate(op.ClientId, op.RequestId) &amp;&amp; isLeader) {\n            \/\/ \u8d85\u65f6\u4e86\u8bf4\u660e raft \u96c6\u7fa4\u4e0d\u4fdd\u8bc1\u5df2\u7ecf commitIndex \u8fc7\u8be5\u65e5\u5fd7\uff0c\u4f46\u662f\u5982\u679c\u662f\u5df2\u7ecf\u63d0\u4ea4\u8fc7\u7684 get \u8bf7\u6c42\uff0c\u662f\u53ef\u4ee5\u518d\u6267\u884c\u7684\uff0c\u4e0d\u4f1a\u8fdd\u53cd\u7ebf\u6027\u4e00\u81f4\u6027\n            std::string value;\n            bool exist = false;\n            ExecuteGetOpOnKVDB(op, &amp;value, &amp;exist);\n            if (exist) {\n                reply-&gt;set_err(OK);\n                reply-&gt;set_value(value);\n            } else {\n                reply-&gt;set_err(ErrNoKey);\n                reply-&gt;set_value(\"\");\n            }\n        } else {\n            reply-&gt;set_err(ErrWrongLeader);  \/\/ \u8fd4\u56de\u8be5\u4fe1\u606f\u7684\u76ee\u7684\u662f\u8ba9 clerk \u6362\u4e00\u4e2a\u8282\u70b9\u91cd\u8bd5\n        }\n    } else {\n        \/\/ \u6ca1\u8d85\u65f6\uff0c\u5373 raft \u5df2\u7ecf\u63d0\u4ea4\u4e86\u8be5 command\uff0c\u53ef\u4ee5\u6b63\u5f0f\u5f00\u59cb\u6267\u884c\u4e86\n        \/\/         DPrintf(\"&#91;WaitChanGetRaftApplyMessage&lt;--]Server %d , get Command &lt;-- Index:%d , ClientId %d,\n        \/\/         RequestId %d, Opreation %v, Key :%v, Value :%v\", kv.me, raftIndex, op.ClientId, op.RequestId,\n        \/\/         op.Operation, op.Key, op.Value)\n        \/\/ todo \u8fd9\u91cc\u8fd8\u8981\u518d\u6b21\u68c0\u9a8c\u7684\u539f\u56e0\uff1a\u611f\u89c9\u4e0d\u7528\u68c0\u9a8c\uff0c\u56e0\u4e3aleader\u53ea\u8981\u6b63\u786e\u7684\u63d0\u4ea4\u4e86\uff0c\u90a3\u4e48\u8fd9\u4e9b\u80af\u5b9a\u662f\u7b26\u5408\u7684\n        if (raftCommitOp.ClientId == op.ClientId &amp;&amp; raftCommitOp.RequestId == op.RequestId) {\n            std::string value;\n            bool exist = false;\n            ExecuteGetOpOnKVDB(op, &amp;value, &amp;exist);\n            if (exist) {\n                reply-&gt;set_err(OK);\n                reply-&gt;set_value(value);\n            } else {\n                reply-&gt;set_err(ErrNoKey);\n                reply-&gt;set_value(\"\");\n            }\n        } else {\n            reply-&gt;set_err(ErrWrongLeader);\n            \/\/            DPrintf(\"&#91;GET ] \u4e0d\u6ee1\u8db3\uff1araftCommitOp.ClientId{%v} == op.ClientId{%v} &amp;&amp;\n            \/\/            raftCommitOp.RequestId{%v}\n            \/\/            == op.RequestId{%v}\", raftCommitOp.ClientId, op.ClientId, raftCommitOp.RequestId,\n            \/\/            op.RequestId)\n        }\n    }\n    m_mtx.lock();   \n    auto tmp = waitApplyCh&#91;raftIndex];\n    waitApplyCh.erase(raftIndex);\n    delete tmp;\n    m_mtx.unlock();\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">RPC \u5982\u4f55\u5b9e\u73b0\u8c03\u7528<\/h2>\n\n\n\n<p>\u4ee5 Raft \u7c7b\u4e3e\u4f8b\uff0c\u901a\u8fc7\u5199 <code>.proto<\/code> \u6587\u4ef6\uff0c\u7528 <code>protoc<\/code> \u7f16\u8bd1\u5668\u81ea\u52a8\u751f\u6210 RPC \u670d\u52a1\u57fa\u7c7b\u3002<\/p>\n\n\n\n<p>\u7ee7\u627f\u751f\u6210\u7684\u7c7b\uff0c\u91cd\u5199 RPC \u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public:  \/\/ \u91cd\u5199\u57fa\u7c7b\u65b9\u6cd5\uff0c\u56e0\u4e3a RPC \u8fdc\u7a0b\u8c03\u7528\u771f\u6b63\u8c03\u7528\u7684\u662f\u8fd9\u4e9b\u65b9\u6cd5\n\/\/ \u5e8f\u5217\u5316\uff0c\u53cd\u5e8f\u5217\u5316\u7b49\u64cd\u4f5c RPC \u6846\u67b6\u90fd\u5df2\u7ecf\u505a\u5b8c\u4e86\uff0c\u56e0\u6b64\u8fd9\u91cc\u53ea\u9700\u8981\u83b7\u53d6\u503c\u7136\u540e\u771f\u6b63\u8c03\u7528\u672c\u5730\u65b9\u6cd5\u5373\u53ef\nvoid AppendEntries(google::protobuf::RpcController *controller, \n                        const ::raftRpcProctoc::AppendEntriesArgs *request,\n                        ::raftRpcProctoc::AppendEntriesReply *response, \n                        ::google::protobuf::Closure *done) override;\nvoid InstallSnapshot(google::protobuf::RpcController *controller,\n                         const ::raftRpcProctoc::InstallSnapshotRequest *request,\n                         ::raftRpcProctoc::InstallSnapshotResponse *response,\n                         ::google::protobuf::Closure *done) override;\nvoid RequestVote(google::protobuf::RpcController *controller, \n                        const ::raftRpcProctoc::RequestVoteArgs *request,\n                        ::raftRpcProctoc::RequestVoteReply *response, \n                        ::google::protobuf::Closure *done) override;<\/code><\/pre>\n\n\n\n<p>\u91cd\u5199\u51fd\u6570\u4e2d\u7684\u56db\u4e2a\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>google::protobuf::RpcController *controller<\/code>\n<ul class=\"wp-block-list\">\n<li>\u4f5c\u7528\uff1a\u63a7\u5236 RPC \u8c03\u7528\u7684\u4e0a\u4e0b\u6587\u4fe1\u606f<\/li>\n\n\n\n<li>\u53ef\u4ee5\u7528\u5b83\u6765\uff1a\u53d6\u6d88\u8c03\u7528\u3001\u83b7\u53d6\u9519\u8bef\u4fe1\u606f\u3001\u8bbe\u7f6e\u5931\u8d25\u72b6\u6001<\/li>\n\n\n\n<li>\u5e38\u7528\u573a\u666f\uff1a\u68c0\u67e5\u7f51\u7edc\u72b6\u6001\uff0c\u68c0\u6d4b\u5ba2\u6237\u7aef\u662f\u5426\u53d6\u6d88\u8c03\u7528<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>const ::raftRpcProctoc::AppendEntriesArgs *request<\/code>\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u662f\u5ba2\u6237\u7aef\u4f20\u6765\u7684\u8bf7\u6c42\u53c2\u6570\uff0c\u5305\u542b Raft \u7684\u8bf7\u6c42\u6570\u636e <\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>::raftRpcProctoc::AppendEntriesReply *response <\/code>\n<ul class=\"wp-block-list\">\n<li>\u9700\u8981\u586b\u5145\u8fd9\u4e2a\u54cd\u5e94\u5bf9\u8c61\uff0c\u7136\u540e\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002\u5185\u5bb9\u4e00\u822c\u5305\u62ec\uff1a\u5f53\u524d\u8282\u70b9\u7684\u4efb\u671f\uff08\u5982\u679c\u53d1\u73b0\u81ea\u5df1\u4efb\u671f\u6bd4\u5ba2\u6237\u7aef\u5927\uff09\u3001\u662f\u5426\u63a5\u53d7\u4e86\u65e5\u5fd7\u6761\u76ee\uff08<code>success<\/code> \u5b57\u6bb5\uff09<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>::google::protobuf::Closure *done <\/code>\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u662f\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u6307\u9488\uff0c\u8868\u793a\u201c\u6211\u5904\u7406\u5b8c\u4e86\uff0c\u53ef\u4ee5\u8fd4\u56de\u7ed3\u679c\u4e86\u201d\u3002\u5fc5\u987b\u5728\u51fd\u6570\u672b\u5c3e\u8c03\u7528 <code>done-&gt;Run();<\/code>\u5982\u679c\u5fd8\u8bb0\u8c03\u7528\u5b83\uff0cRPC \u6846\u67b6\u90a3\u8fb9\u4f1a\u4e00\u76f4\u201c\u6302\u8d77\u201d\uff0c\u4e0d\u4f1a\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u54cd\u5e94\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Clerk \u5ba2\u6237\u7aef<\/h2>\n\n\n\n<p>clerk \u76f8\u5f53\u4e8e\u662f\u4e00\u4e2a\u5916\u90e8\u7684\u5ba2\u6237\u7aef\uff0c\u4f5c\u7528\u5c31\u662f\u5411\u6574\u4e2a raft \u96c6\u7fa4\u53d1\u8d77\u547d\u4ee4\u5e76\u63a5\u6536\u54cd\u5e94\u3002\u5728 kvServer \u4e00\u8282\u4e2d\u6709\u63d0\u5230\u8fc7\uff0cclerk \u4e0e kvServer \u9700\u8981\u5efa\u7acb\u7f51\u7edc\u8fde\u63a5\uff0c\u65e2\u7136\u6211\u4eec\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5355\u7684 RPC\uff0c\u90a3\u4e48\u6211\u4eec\u4e0d\u59a8\u4f7f\u7528 RPC \u6765\u5b8c\u6210\u8fd9\u4e2a\u8fc7\u7a0b\u3002clerk \u672c\u8eab\u8fd8\u662f\u6bd4\u8f83\u7b80\u5355\u7684\uff0c\u552f\u4e00\u8981\u6ce8\u610f\u7684\u5c31\u662f\u5982\u679c RPC \u8fd4\u56de\u5bf9\u7aef\u4e0d\u662f leader \u7684\u8bdd\uff0c\u5c31\u9700\u8981\u518d\u8c03\u7528\u53e6\u4e00\u4e2a\u8282\u70b9\u91cd\u8bd5\uff0c\u76f4\u5230\u6210\u529f\u4e0e leader \u5efa\u7acb\u8fde\u63a5\uff0c\u4ece\u800c\u4fdd\u8bc1\u8bf7\u6c42\u80fd\u591f\u88ab\u6b63\u786e\u5904\u7406\u548c\u590d\u5236\uff0c\u786e\u4fdd\u7ebf\u6027\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int main() {\n    Clerk client; \/\/ \u521b\u5efa\u4e00\u4e2a Clerk \u5ba2\u6237\u7aef\u5b9e\u4f8b \n    client.Init(\"test.conf\"); \/\/ \u521d\u59cb\u5316\u5ba2\u6237\u7aef\uff0c\u4f20\u5165\u914d\u7f6e\u6587\u4ef6\n    auto start = now();\n    int count = 500; \/\/ \u5907\u8fdb\u884c 500 \u6b21\u5199+\u8bfb\u6d4b\u8bd5\n    int tmp = count;\n    while (tmp--) {\n        client.Put(\"x\", std::to_string(tmp)); \/\/ \u6bcf\u6b21\u5faa\u73af\uff0c\u628a\u53d8\u91cf tmp \u8f6c\u4e3a\u5b57\u7b26\u4e32\uff0c\u5199\u5165 key \"x\" \n\n        std::string get1 = client.Get(\"x\"); \/\/ \u7d27\u8ddf\u7740\u6bcf\u6b21\u5199\u5165\u540e\uff0c\u9a6c\u4e0a\u8bfb\u53d6\u540c\u4e00\u4e2a key \"x\"\n        std::printf(\"get return :{%s}\\r\\n\", get1.c_str());\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u91cd\u70b9\u5173\u6ce8\u4e0b\u9762\u7684 Init \u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u4f1a\u8bfb\u53d6\u53c2\u6570\u4e2d\u914d\u7f6e\u6587\u4ef6\u6240\u5217\u51fa\u7684\u6240\u6709\u202fRaft\u202f\u8282\u70b9\u7684\u202fIP \u548c Port\uff0c\u7136\u540e\u4e3a\u6bcf\u4e2a\u8282\u70b9\u521b\u5efa\u4e00\u4e2a\u202f<code>raftServerRpcUtil<\/code>\u202f\u5b9e\u4f8b\u5e76\u4fdd\u5b58\u5230\u202f<code>m_servers<\/code>\uff0c\u4ece\u800c\u5efa\u7acb\u5ba2\u6237\u7aef\u5230\u5404\u8282\u70b9\u7684 RPC \u901a\u9053\u3002 <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521d\u59cb\u5316\u5ba2\u6237\u7aef\nvoid Clerk::Init(std::string configFileName) {\n    \/\/ \u83b7\u53d6\u6240\u6709 raft \u8282\u70b9\u7684 ip \u548c port \u5e76\u8fdb\u884c\u8fde\u63a5\n    MprpcConfig config; \/\/ MprpcConfig\u202f\u662f\u81ea\u7814\u202fMprRpc\u202f\u6846\u67b6\u7684\u914d\u7f6e\u89e3\u6790\u5668\n    config.LoadConfigFile(configFileName.c_str()); \/\/ \u89e3\u6790\u914d\u7f6e\u6587\u4ef6\uff08\u914d\u7f6e\u6587\u4ef6\u91cc\u5c31\u662f\u5404\u8282\u70b9\u7684 IP \u548c\u7aef\u53e3\uff09\n\n    \/\/ \u6784\u9020\u8282\u70b9\u5217\u8868\n    std::vector&lt;std::pair&lt;std::string, short&gt;&gt; ipPortVt;\n    for (int i = 0; i &lt; INT_MAX - 1; ++i) {\n        std::string node = \"node\" + std::to_string(i);\n        std::string nodeIp = config.Load(node + \"ip\");\n        std::string nodePortStr = config.Load(node + \"port\");\n        if (nodeIp.empty()) {\n            break;\n        }\n        ipPortVt.emplace_back(nodeIp, atoi(nodePortStr.c_str())); \n    }\n    \/\/ \u4e3a\u6bcf\u4e2a\u8282\u70b9\u5efa\u7acb RPC \u901a\u9053\u5bf9\u8c61\n    for (const auto&amp; item : ipPortVt) {\n        std::string ip = item.first;\n        short port = item.second;\n        auto* rpc = new raftServerRpcUtil(ip, port);\n        m_servers.push_back(std::shared_ptr&lt;raftServerRpcUtil&gt;(rpc));\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u518d\u5173\u6ce8\u4e00\u4e0b <code>client.Put(\"x\", std::to_string(tmp));<\/code> \u8fd9\u53e5\u4ee3\u7801\u4e2d\u7684 put \u51fd\u6570\uff0cput \u51fd\u6570\u5b9e\u9645\u4e0a\u8c03\u7528\u7684\u662f PutAppend \u51fd\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void Clerk::Put(std::string key, std::string value) { PutAppend(key, value, \"Put\"); }\n\nvoid Clerk::PutAppend(std::string key, std::string value, std::string op) {\n    \/\/ \u5411\u96c6\u7fa4\u5199\u5165\u4e00\u6761 PutAppend \u6307\u4ee4\uff0c\u5185\u90e8\u5faa\u73af\u91cd\u8bd5\uff0c\u76f4\u5230\u7531\u5f53\u524d Leader \u6210\u529f\u63d0\u4ea4\n    m_requestId++; \/\/ \u4e3a\u672c\u6b21\u64cd\u4f5c\u751f\u6210\u5355\u8c03\u9012\u589e\u7684\u5168\u5c40\u8bf7\u6c42\u53f7\n    auto requestId = m_requestId; \/\/ \u5e42\u7b49\u4fdd\u8bc1auto requestId = m_requestId; \/\/ \u5e42\u7b49\u4fdd\u8bc1\uff0cLeader \u6536\u5230 (clientId, requestId) \u65f6\uff0c\u5982\u5df2\u5904\u7406\u8fc7\u4f1a\u76f4\u63a5\u8fd4\u56de OK\uff0c\u4e0d\u4f1a\u518d\u6b21\u63d2\u5165\u65e5\u5fd7 \n    auto server = m_recentLeaderId; \/\/ \u5148\u4ece\u201c\u6700\u8fd1\u8ba4\u4e3a\u7684 Leader\u201d \u5f00\u59cb\u8bd5\n    while (true) { \/\/ \u65e0\u9650\u91cd\u8bd5\uff0c\u76f4\u5230 Leader \u63d0\u4ea4\u8be5\u6307\u4ee4\n        \/\/ \u6784\u9020 RPC \u8bf7\u6c42\n        raftKVRpcProctoc::PutAppendArgs args; \n        args.set_key(key);\n        args.set_value(value);\n        args.set_op(op);\n        args.set_clientid(m_clientId);\n        args.set_requestid(requestId);\n        \n        raftKVRpcProctoc::PutAppendReply reply; \/\/ \u521b\u5efa\u51c6\u5907\u63a5\u6536\u7684\u54cd\u5e94\n        bool ok = m_servers&#91;server]-&gt;PutAppend(&amp;args, &amp;reply); \/\/ \u53d1\u9001 RPC\n        if (!ok || reply.err() == ErrWrongLeader) { \/\/ \u5982\u679c\u8c03\u7528\u5931\u8d25\u6216\u53d1\u7ed9\u4e86 Follower\n            DPrintf(\"\u3010Clerk::PutAppend\u3011\u539f\u4ee5\u4e3a\u7684leader\uff1a{%d}\u8bf7\u6c42\u5931\u8d25\uff0c\u5411\u65b0leader{%d}\u91cd\u8bd5  \uff0c\u64cd\u4f5c\uff1a{%s}\", server,\n                    server + 1, op.c_str());\n            if (!ok) {\n                DPrintf(\"\u91cd\u8bd5\u539f\u56e0 \uff0crpc\u5931\u6557 \uff0c\");\n            }\n            if (reply.err() == ErrWrongLeader) {\n                DPrintf(\"\u91cd\u8a66\u539f\u56e0\uff1a\u975eleader\");\n            }\n            server = (server + 1) % m_servers.size();  \/\/ \u8f6e\u8be2\u4e0b\u4e00\u4e2a\u8282\u70b9\n            continue; \/\/ \u7ee7\u7eed while(true)\n        }\n        if (reply.err() == OK) {  \/\/ \u5373\u771f\u6b63\u7684 Leader \u5df2\u6210\u529f\u63d0\u4ea4\n            m_recentLeaderId = server; \/\/ \u8bb0\u4f4f\u65b0 Leader\uff0c\u4e0b\u6b21\u4f18\u5148\u53d1\u7ed9\u5b83\n            return;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0a\u5c42 KV \u6570\u636e\u5e93<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6570\u636e\u7ed3\u6784<\/h3>\n\n\n\n<p><strong>\u539f\u9879\u76ee\u662f\u4f7f\u7528 unordered_map \u6765\u4ee3\u66ff\u4e0a\u5c42\u7684 kvDB\uff0c\u6211\u4eec\u5bf9\u5176\u8fdb\u884c<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">\u4f18\u5316<\/mark>\uff0c\u4f7f\u7528\u8df3\u8868\u3002<\/strong>\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u5e26\u6765\u4e86\u6027\u80fd\u548c\u529f\u80fd\u7684\u63d0\u5347\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6709\u5e8f\u6027<\/strong> \n<ul class=\"wp-block-list\">\n<li><code>unordered_map<\/code> \u662f\u54c8\u5e0c\u7ed3\u6784\uff0c\u4e0d\u4fdd\u6301\u952e\u7684\u4efb\u4f55\u987a\u5e8f\u3002<\/li>\n\n\n\n<li>\u8df3\u8868\u672c\u8d28\u662f\u591a\u7ea7\u94fe\u8868\uff0c\u5929\u7136\u6309\u952e\u6709\u5e8f\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5355\u70b9\u64cd\u4f5c\u65f6\u95f4\u590d\u6742\u5ea6\n<ul class=\"wp-block-list\">\n<li><code>unordered_map<\/code>\uff1a\u5728\u8d1f\u8f7d\u56e0\u5b50\u7a33\u5b9a\u3001\u51b2\u7a81\u5747\u5300\u65f6\u4e3a O(1)\uff0c\u4f46\u4f1a\u53d7<strong>\u91cd\u54c8\u5e0c<\/strong>\u4e0e<strong>\u51b2\u7a81<\/strong>\u7684\u5f71\u54cd\uff0c\u6781\u7aef\u503c\u53ef\u9000\u5316\u5230 O(n)\uff1b\u8df3\u8868\u59cb\u7ec8\u4e3a O(log\u202fn)\uff0c\u66f4\u5e73\u6ed1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6269\u5bb9\n<ul class=\"wp-block-list\">\n<li><code>unordered_map<\/code> \u6269\u5bb9\u65f6\u9700\u8981\u91cd\u65b0\u54c8\u5e0c\uff0c\u5e26\u6765\u6027\u80fd\u635f\u8017\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-14.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"826\" height=\"251\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-14.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-3011\"  sizes=\"auto, (max-width: 826px) 100vw, 826px\" \/><\/div><\/figure>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u4e0d\u7528 map\uff08\u7ea2\u9ed1\u6811\uff09\u6765\u5b9e\u73b0\uff1f<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4ece\u5185\u5b58\u5360\u7528\u4e0a\u6765\u6bd4\u8f83\uff0c\u8df3\u8868\u6bd4\u5e73\u8861\u6811\uff08\u5305\u62ec\u7ea2\u9ed1\u6811\u3001AVL \u6811\uff09\u66f4\u7075\u6d3b\u4e00\u4e9b\u3002\u5e73\u8861\u6811\u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u4e24\u4e2a\u6307\u9488\uff08\u5206\u522b\u6307\u5411\u5de6\u53f3\u5b50\u6811\uff09\uff0c\u800c\u8df3\u8868\u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u7684\u6307\u9488\u6570\u76ee\u5e73\u5747\u4e3a 1\/(1-p)\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u53c2\u6570 p \u7684\u5927\u5c0f\uff08p \u662f\u5728\u6784\u5efa\u6216\u63d2\u5165\u8282\u70b9\u65f6\uff0c\u51b3\u5b9a\u8be5\u8282\u70b9\u662f\u5426\u62e5\u6709\u66f4\u9ad8\u4e00\u5c42\u6307\u9488\u7684\u6982\u7387\uff09\u3002\u5982\u679c\u50cf Redis \u91cc\u7684\u5b9e\u73b0\u4e00\u6837\uff0c\u53d6 p=1\/4\uff0c\u90a3\u4e48\u5e73\u5747\u6bcf\u4e2a\u8282\u70b9\u5305\u542b 1.33 \u4e2a\u6307\u9488\uff0c\u6bd4\u5e73\u8861\u6811\u66f4\u6709\u4f18\u52bf\u3002\u4f46\u6211\u4eec\u7684 p \u53d6 0.5\uff0c\u90a3\u4e48\u6bcf\u4e2a\u8282\u70b9\u5e73\u5747\u6709 2 \u4e2a\u6307\u9488\uff0c\u548c\u5e73\u8861\u6811\u4e00\u6837\u4e86\u3002<\/li>\n\n\n\n<li>\u5728\u505a\u8303\u56f4\u67e5\u627e\u7684\u65f6\u5019\uff0c\u8df3\u8868\u6bd4\u5e73\u8861\u6811\u64cd\u4f5c\u8981\u7b80\u5355\u3002\u5728\u5e73\u8861\u6811\u4e0a\uff0c\u6211\u4eec\u627e\u5230\u6307\u5b9a\u8303\u56f4\u7684\u5c0f\u503c\u4e4b\u540e\uff0c\u8fd8\u9700\u8981\u4ee5\u4e2d\u5e8f\u904d\u5386\u7684\u987a\u5e8f\u7ee7\u7eed\u5bfb\u627e\u5176\u5b83\u4e0d\u8d85\u8fc7\u5927\u503c\u7684\u8282\u70b9\u3002\u5982\u679c\u4e0d\u5bf9\u5e73\u8861\u6811\u8fdb\u884c\u4e00\u5b9a\u7684\u6539\u9020\uff0c\u8fd9\u91cc\u7684\u4e2d\u5e8f\u904d\u5386\u5e76\u4e0d\u5bb9\u6613\u5b9e\u73b0\u3002\u800c\u5728\u8df3\u8868\u4e0a\u8fdb\u884c\u8303\u56f4\u67e5\u627e\u5c31\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u8981\u5728\u627e\u5230\u5c0f\u503c\u4e4b\u540e\uff0c\u5bf9\u7b2c1\u5c42\u94fe\u8868\u8fdb\u884c\u82e5\u5e72\u6b65\u7684\u904d\u5386\u5c31\u53ef\u4ee5\u5b9e\u73b0\u3002<\/li>\n\n\n\n<li>\u4ece\u7b97\u6cd5\u5b9e\u73b0\u96be\u5ea6\u4e0a\u6765\u6bd4\u8f83\uff0c\u8df3\u8868\u6bd4\u5e73\u8861\u6811\u8981\u7b80\u5355\u5f97\u591a\u3002\u5e73\u8861\u6811\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u53ef\u80fd\u5f15\u53d1\u5b50\u6811\u7684\u8c03\u6574\u903b\u8f91\u590d\u6742\uff0c\u800c\u8df3\u8868\u7684\u63d2\u5165\u548c\u5220\u9664\u53ea\u9700\u8981\u4fee\u6539\u76f8\u90bb\u8282\u70b9\u7684\u6307\u9488\uff0c\u64cd\u4f5c\u7b80\u5355\u53c8\u5feb\u901f\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u603b\u7ed3<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u4e0e unordered_map\uff08\u54c8\u5e0c\u8868\uff09\u6bd4\u7684\u8bdd\uff0c\u8df3\u8868\u7684\u4f18\u52bf\u5728\u4e8e\uff1a\n<ul class=\"wp-block-list\">\n<li><code>unordered_map<\/code> \u662f\u54c8\u5e0c\u7ed3\u6784\uff0c\u4e0d\u4fdd\u6301\u952e\u7684\u6709\u5e8f\u6027\uff0c\u800c\u8df3\u8868\u672c\u8d28\u662f\u591a\u7ea7\u94fe\u8868\uff0c\u5929\u7136\u6309\u952e\u6709\u5e8f\u3002<\/li>\n\n\n\n<li><code>unordered_map<\/code> \u5728\u8d1f\u8f7d\u56e0\u5b50\u7a33\u5b9a\u3001\u51b2\u7a81\u5747\u5300\u65f6\u4e3a O(1)\uff0c\u4f46\u4f1a\u53d7\u91cd\u54c8\u5e0c\u4e0e\u51b2\u7a81\u7684\u5f71\u54cd\uff0c\u6781\u7aef\u503c\u53ef\u9000\u5316\u5230 O(n)\uff0c\u800c\u8df3\u8868\u59cb\u7ec8\u4e3a O(log\u202fn)\uff0c\u66f4\u5e73\u6ed1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5982\u679c\u4e0e map\uff08\u7ea2\u9ed1\u6811\uff09\u6bd4\u7684\u8bdd\uff0c\u8df3\u8868\u7684\u4f18\u52bf\u5728\u4e8e\uff1a\n<ul class=\"wp-block-list\">\n<li>\u4ece\u7b97\u6cd5\u5b9e\u73b0\u96be\u5ea6\u4e0a\u6765\u6bd4\u8f83\uff0c\u8df3\u8868\u6bd4\u5e73\u8861\u6811\u8981\u7b80\u5355\u5f97\u591a\u3002<\/li>\n\n\n\n<li>\u5e73\u8861\u6811\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u53ef\u80fd\u5f15\u53d1\u5b50\u6811\u7684\u8c03\u6574\u903b\u8f91\u590d\u6742\uff0c\u800c\u8df3\u8868\u7684\u63d2\u5165\u548c\u5220\u9664\u53ea\u9700\u8981\u4fee\u6539\u76f8\u90bb\u8282\u70b9\u7684\u6307\u9488\uff0c\u64cd\u4f5c\u7b80\u5355\u53c8\u5feb\u901f\u3002<\/li>\n\n\n\n<li>\u4ece\u5185\u5b58\u5360\u7528\u4e0a\u6765\u6bd4\u8f83\uff0c\u5e73\u8861\u6811\u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u4e24\u4e2a\u6307\u9488\uff0c\u800c\u8df3\u8868\u5e73\u5747\u6bcf\u4e2a\u8282\u70b9\u5305\u542b 1.33 \u4e2a\u6307\u9488\uff08\u82e5\u53d6 p=1\/4\uff09\uff0c\u6bd4\u5e73\u8861\u6811\u66f4\u6709\u4f18\u52bf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u6838\u5fc3\u4ee3\u7801<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Node \u7c7b\u6a21\u677f<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>template&lt;typename K, typename V&gt; \nclass Node {\npublic:\n    Node() {} \n    Node(K k, V v, int); \n    ~Node();\n    K get_key() const;\n    V get_value() const;\n    void set_value(V);\n    Node&lt;K, V&gt; **forward; \/\/ Node&lt;K, V&gt; ** \u8868\u793a\u4e00\u4e2a\u6307\u9488\uff0c\u5b83\u6307\u5411\u7684\u662f\u4e00\u4e2a\u5b58\u50a8 Node&lt;K, V&gt; * \u7c7b\u578b\u6307\u9488\u7684\u6570\u7ec4\n    int node_level;\nprivate:\n    K key;\n    V value;\n};\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Node<\/code> \u7c7b\u8868\u793a\u8df3\u8868\u4e2d\u7684\u8282\u70b9\uff0c\u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u4e00\u4e2a\u952e <code>key<\/code>\u3001\u4e00\u4e2a\u503c <code>value<\/code>\u3001\u4e00\u4e2a\u8282\u70b9\u5c42\u7ea7 <code>node_level<\/code> \u548c\u4e00\u4e2a\u6307\u5411\u4e0d\u540c\u5c42\u7ea7\u4e0b\u4e00\u4e2a\u8282\u70b9\u7684\u6307\u9488\u6570\u7ec4 <code>forward<\/code>\u3002 <\/li>\n\n\n\n<li>\u63d0\u4f9b\u4e86\u6784\u9020\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570\u3001\u83b7\u53d6\u952e\u548c\u503c\u7684\u65b9\u6cd5\u4ee5\u53ca\u8bbe\u7f6e\u503c\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><code>Node<\/code> \u7c7b\u6210\u5458\u51fd\u6570\u5b9e\u73b0<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>template&lt;typename K, typename V&gt; \nNode&lt;K, V&gt;::Node(const K k, const V v, int level) {\n    this-&gt;key = k;\n    this-&gt;value = v;\n    this-&gt;node_level = level; \n    this-&gt;forward = new Node&lt;K, V&gt;*&#91;level+1];\n    memset(this-&gt;forward, 0, sizeof(Node&lt;K, V&gt;*)*(level+1));\n};\n\ntemplate&lt;typename K, typename V&gt; \nNode&lt;K, V&gt;::~Node() {\n    delete &#91;]forward;\n};\n\ntemplate&lt;typename K, typename V&gt; \nK Node&lt;K, V&gt;::get_key() const {\n    return key;\n};\n\ntemplate&lt;typename K, typename V&gt; \nV Node&lt;K, V&gt;::get_value() const {\n    return value;\n};\n\ntemplate&lt;typename K, typename V&gt; \nvoid Node&lt;K, V&gt;::set_value(V value) {\n    this-&gt;value=value;\n};\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u8282\u70b9\u7684\u952e\u3001\u503c\u548c\u5c42\u7ea7\uff0c\u5e76\u4e3a <code>forward<\/code> \u6570\u7ec4\u5206\u914d\u5185\u5b58\u3002<\/li>\n\n\n\n<li>\u6790\u6784\u51fd\u6570\u91ca\u653e <code>forward<\/code> \u6570\u7ec4\u7684\u5185\u5b58\u3002<\/li>\n\n\n\n<li><code>get_key<\/code> \u548c <code>get_value<\/code> \u65b9\u6cd5\u5206\u522b\u8fd4\u56de\u8282\u70b9\u7684\u952e\u548c\u503c\u3002<\/li>\n\n\n\n<li><code>set_value<\/code> \u65b9\u6cd5\u8bbe\u7f6e\u8282\u70b9\u7684\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><code>SkipList<\/code> \u7c7b\u6a21\u677f<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt; \nclass SkipList {\npublic: \n    SkipList(int);\n    ~SkipList();\n    int get_random_level();\n    Node&lt;K, V&gt;* create_node(K, V, int);\n    int insert_element(K, V);\n    void display_list();\n    bool search_element(K);\n    void delete_element(K);\n    void dump_file();\n    void load_file();\n    void clear(Node&lt;K,V&gt;*);\n    int size();\nprivate:\n    void get_key_value_from_string(const std::string&amp; str, std::string* key, std::string* value);\n    bool is_valid_string(const std::string&amp; str);\nprivate:    \n    int _max_level;\n    int _skip_list_level;\n    Node&lt;K, V&gt; *_header;\n    std::ofstream _file_writer;\n    std::ifstream _file_reader;\n    int _element_count;\n};\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>SkipList<\/code> \u7c7b\u8868\u793a\u8df3\u8868\u6570\u636e\u7ed3\u6784\uff0c\u5305\u542b\u4ee5\u4e0b\u6210\u5458\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6700\u5927\u5c42\u7ea7 <code>_max_level<\/code> \u548c\u5f53\u524d\u5c42\u7ea7 <code>_skip_list_level<\/code>\uff08\u5c42\u7ea7\u7d22\u5f15\u662f[0, <code>_skip_list_level<\/code>]\uff09\u3002<\/li>\n\n\n\n<li>\u5934\u8282\u70b9\u6307\u9488 <code>_header<\/code>\u3002<\/li>\n\n\n\n<li>\u6587\u4ef6\u5199\u5165\u6d41 <code>_file_writer<\/code> \u548c\u6587\u4ef6\u8bfb\u53d6\u6d41 <code>_file_reader<\/code>\u3002<\/li>\n\n\n\n<li>\u5f53\u524d\u5143\u7d20\u6570\u91cf <code>_element_count<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u63d0\u4f9b\u4e86\u63d2\u5165\u3001\u5220\u9664\u3001\u67e5\u627e\u3001\u663e\u793a\u3001\u6570\u636e\u843d\u76d8\u548c\u52a0\u8f7d\u7b49\u516c\u5171\u65b9\u6cd5\uff0c\u4ee5\u53ca\u4e00\u4e9b\u8f85\u52a9\u7684\u79c1\u6709\u65b9\u6cd5\uff08\u8be6\u89c1\u4e0b\u65b9\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><code>SkipList<\/code> \u7c7b\u6210\u5458\u51fd\u6570\u5b9e\u73b0<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">1 \u6784\u9020\u51fd\u6570\u548c\u6790\u6784\u51fd\u6570<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nSkipList&lt;K, V&gt;::SkipList(int max_level)\n{\n\n    this-&gt;_max_level = max_level;\n    this-&gt;_skip_list_level = 0;\n    this-&gt;_element_count = 0;\n\n    \/\/ create header node and initialize key and value to null\n    K k;\n    V v;\n    this-&gt;_header = new Node&lt;K, V&gt;(k, v, _max_level);\n};\n\ntemplate &lt;typename K, typename V&gt;\nSkipList&lt;K, V&gt;::~SkipList()\n{\n\n    if (_file_writer.is_open())\n    {\n        _file_writer.close();\n    }\n    if (_file_reader.is_open())\n    {\n        _file_reader.close();\n    }\n\n    \/\/ \u9012\u5f52\u5220\u9664\u8df3\u8868\u94fe\u6761\n    if (_header-&gt;forward&#91;0] != nullptr)\n    {\n        clear(_header-&gt;forward&#91;0]);\n    }\n    delete (_header);\n}\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u8df3\u8868\u7684\u6700\u5927\u5c42\u7ea7\u3001\u5f53\u524d\u5c42\u7ea7\u548c\u5143\u7d20\u6570\u91cf\uff0c\u5e76\u521b\u5efa\u5934\u8282\u70b9\u3002<\/li>\n\n\n\n<li>\u6790\u6784\u51fd\u6570\u5173\u95ed\u6587\u4ef6\u6d41\uff0c\u9012\u5f52\u5220\u9664\u8df3\u8868\u4e2d\u7684\u6240\u6709\u8282\u70b9\uff0c\u6700\u540e\u5220\u9664\u5934\u8282\u70b9\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">2 \u521b\u5efa\u8282\u70b9\u548c\u968f\u673a\u5c42\u7ea7<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>template&lt;typename K, typename V&gt;\nNode&lt;K, V&gt;* SkipList&lt;K, V&gt;::create_node(const K k, const V v, int level) {\n    Node&lt;K, V&gt; *n = new Node&lt;K, V&gt;(k, v, level);\n    return n;\n}\n\ntemplate&lt;typename K, typename V&gt;\nint SkipList&lt;K, V&gt;::get_random_level() {\n    int k = 1;\n    while (rand() % 2) {\n        k++;\n    }\n    k = (k &lt; _max_level) ? k : _max_level;\n    return k;\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>create_node<\/code> \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u8282\u70b9\u3002<\/li>\n\n\n\n<li><code>get_random_level<\/code> \u65b9\u6cd5\u968f\u673a\u751f\u6210\u4e00\u4e2a\u8282\u70b9\u7684\u5c42\u7ea7\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">3 \u203b\u63d2\u5165\u5143\u7d20<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nint SkipList&lt;K, V&gt;::insert_element(const K key, const V value)\n{\n    mtx.lock(); \/\/ \u5168\u5c40\u4e92\u65a5\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\n    Node&lt;K, V&gt; *current = this-&gt;_header; \/\/ \u4ece\u5934\u7ed3\u70b9\u5f00\u59cb\n\n    Node&lt;K, V&gt; *update&#91;_max_level + 1]; \/\/ update&#91;i] \u6700\u7ec8\u5c06\u6307\u5411 \u7b2c\u202fi\u202f\u5c42 \u63d2\u5165\u4f4d\u7f6e\u524d\u7684\u8282\u70b9\uff0c\u5373\u524d\u9a71\u8282\u70b9\n    memset(update, 0, sizeof(Node&lt;K, V&gt; *) * (_max_level + 1));\n\n    \/\/ \u81ea\u9876\u5411\u4e0b\u67e5\u627e\u63d2\u5165\u4f4d\u7f6e\uff0c\u627e\u5230\u6bcf\u4e00\u5c42\u7684\u63d2\u5165\u4f4d\u7f6e\u7684\u524d\u9a71\u8282\u70b9 \n    for (int i = _skip_list_level; i &gt;= 0; i--)\n    {\n        while (current-&gt;forward&#91;i] != NULL &amp;&amp; current-&gt;forward&#91;i]-&gt;get_key() &lt; key)\n        {\n            current = current-&gt;forward&#91;i]; \/\/ \u6c34\u5e73\u5411\u53f3\u627e\n        }\n        update&#91;i] = current; \/\/ \u8bb0\u5f55\u524d\u4e00\u4e2a\u8282\u70b9\n    }\n\n    \/\/ \u79fb\u5230\u6700\u5e95\u5c42\uff0c\u68c0\u67e5\u662f\u5426\u5df2\u7ecf\u6709\u91cd\u590d\u5143\u7d20\uff0c\u56e0\u4e3a\u6700\u5e95\u5c42\u5305\u542b\u5168\u90e8\u5143\u7d20\n    current = current-&gt;forward&#91;0]; \/\/ \u6700\u7ec8 current \u6307\u5411\u5e95\u5c42\u9996\u4e2a\u202f\u2265\u202fkey \u7684\u8282\u70b9\n\n    \/\/ \u5982\u679c\u5df2\u7ecf\u6709\u76f8\u540c key\uff0c\u4e0d\u5141\u8bb8\u63d2\u5165\u91cd\u590d\u952e\uff0c\u76f4\u63a5\u8fd4\u56de1\n    if (current != NULL &amp;&amp; current-&gt;get_key() == key)\n    {\n        std::cout &lt;&lt; \"key: \" &lt;&lt; key &lt;&lt; \", exists\" &lt;&lt; std::endl;\n        mtx.unlock();\n        return 1;\n    }\n\n    \/\/ \u5982\u679c current \u4e3a NULL\uff0c\u5219\u8868\u793a\u5df2\u5230\u8fbe\u5c42\u7ea7\u672b\u5c3e\n    \/\/ \u5982\u679c current \u7684 key \u4e0d\u7b49\u4e8e key\uff0c\u5219\u8868\u793a\u5fc5\u987b\u5728 update&#91;0] \u548c\u5f53\u524d\u8282\u70b9\u4e4b\u95f4\u63d2\u5165\u8282\u70b9\n    if (current == NULL || current-&gt;get_key() != key)\n    {\n        int random_level = get_random_level(); \/\/ \u751f\u6210\u968f\u673a\u5c42\u7ea7\uff0c\u4e8c\u5206\u4e4b\u4e00\u7684\u51e0\u7387\u9012\u589e\u4e00\u5c42\n\n        \/\/ \u5982\u679c\u751f\u6210\u7684\u968f\u673a\u5c42\u7ea7\u5927\u4e8e\u8df3\u8868\u7684\u5c42\u7ea7\uff0c\u5219\u8df3\u8868\u9700\u8981\u201c\u957f\u9ad8\u201d \n        if (random_level &gt; _skip_list_level)\n        {\n            for (int i = _skip_list_level + 1; i &lt; random_level + 1; i++)\n            {\n                update&#91;i] = _header; \/\/ \u65b0\u5c42\u7ea7\u4f7f\u7528\u5934\u8282\u70b9\u4f5c\u4e3a\u524d\u9a71\n            }\n            _skip_list_level = random_level;\n        }\n\n        \/\/ \u5728\u8fd9\u5c42\u4e0a\u521b\u5efa\u5e76\u94fe\u63a5\u65b0\u8282\u70b9\n        Node&lt;K, V&gt; *inserted_node = create_node(key, value, random_level);\n\n        for (int i = 0; i &lt;= random_level; i++)\n        {\n            inserted_node-&gt;forward&#91;i] = update&#91;i]-&gt;forward&#91;i]; \/\/ \u5c06\u524d\u9a71\u8282\u70b9\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\u4f5c\u4e3a\u65b0\u8282\u70b9\u7684\u540e\u7ee7\u8282\u70b9\n            update&#91;i]-&gt;forward&#91;i] = inserted_node; \/\/ \u524d\u9a71\u8282\u70b9\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\u53d8\u6210\u4e86\u65b0\u63d2\u5165\u7684\u8282\u70b9\n        }\n        std::cout &lt;&lt; \"Successfully inserted key:\" &lt;&lt; key &lt;&lt; \", value:\" &lt;&lt; value &lt;&lt; std::endl;\n        _element_count++;\n    }\n    mtx.unlock(); \/\/ \u89e3\u9501\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63d2\u5165\u5143\u7d20\u65f6\uff0c\u9996\u5148\u4f7f\u7528\u4e92\u65a5\u9501\u4fdd\u62a4\u4e34\u754c\u533a\u3002<\/li>\n\n\n\n<li>\u4ece\u6700\u9ad8\u5c42\u7ea7\u5f00\u59cb\u67e5\u627e\u63d2\u5165\u4f4d\u7f6e\uff0c\u8bb0\u5f55\u6bcf\u4e2a\u5c42\u7ea7\u63d2\u5165\u5143\u7d20\u7684\u524d\u9a71\u8282\u70b9\u3002<\/li>\n\n\n\n<li>\u68c0\u67e5\u6700\u5e95\u5c42\uff0c\u5982\u679c\u952e\u5df2\u7ecf\u5b58\u5728\uff0c\u8f93\u51fa\u63d0\u793a\u4fe1\u606f\u5e76\u8fd4\u56de 1\u3002<\/li>\n\n\n\n<li>\u5426\u5219\uff0c\u968f\u673a\u751f\u6210\u4e00\u4e2a\u5c42\u7ea7\u503c\uff0c\u521b\u5efa\u65b0\u8282\u70b9\u5e76\u63d2\u5165\u5230\u76f8\u5e94\u4f4d\u7f6e\uff0c\u66f4\u65b0 update \u548c forward \u6570\u7ec4\u4ee5\u53ca\u5143\u7d20\u6570\u91cf\uff0c\u6700\u540e\u91ca\u653e\u4e92\u65a5\u9501\u5e76\u8fd4\u56de 0\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">4 \u5220\u9664\u5143\u7d20<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nvoid SkipList&lt;K, V&gt;::delete_element(K key)\n{\n    mtx.lock(); \/\/ \u52a0\u9501\n\n    Node&lt;K, V&gt; *current = this-&gt;_header; \/\/ \u4ece\u5934\u8282\u70b9\u5f00\u59cb\n    Node&lt;K, V&gt; *update&#91;_max_level + 1]; \/\/ \u4fdd\u5b58\u7b2c\u202fi\u202f\u5c42 \u4e2d\u5f85\u5220\u8282\u70b9\u7684\u524d\u9a71\n    memset(update, 0, sizeof(Node&lt;K, V&gt; *) * (_max_level + 1));\n\n    \/\/ \u641c\u7d22\u903b\u8f91\u4e0e\u63d2\u5165\u76f8\u540c\uff1a\u81ea\u9876\u5411\u4e0b\u3001\u53f3\u79fb\u540e\u4e0b\u8df3 \n    for (int i = _skip_list_level; i &gt;= 0; i--)\n    {\n        while (current-&gt;forward&#91;i] != NULL &amp;&amp; current-&gt;forward&#91;i]-&gt;get_key() &lt; key)\n        {\n            current = current-&gt;forward&#91;i];\n        }\n        update&#91;i] = current; \/\/ \u8bb0\u5f55\u524d\u9a71\n    }\n\n    current = current-&gt;forward&#91;0]; \/\/ \u6700\u7ec8 current \u6307\u5411\u5e95\u5c42\u9996\u4e2a\u202f\u2265\u202fkey \u7684\u8282\u70b9\n    if (current != NULL &amp;&amp; current-&gt;get_key() == key)\n    {\n        \/\/ \u4ece\u5e95\u5c42\u5f00\u59cb\u5220\u9664\u6bcf\u4e00\u5c42\u7ea7\u7684\u76ee\u6807\u8282\u70b9\n        for (int i = 0; i &lt;= _skip_list_level; i++)\n        {\n            \/\/ \u4e00\u65e6\u67d0\u5c42\u524d\u9a71\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\u5e76\u4e0d\u6307\u5411\u76ee\u6807\u8282\u70b9\uff0c\u8bf4\u660e\u76ee\u6807\u8282\u70b9\u5728\u90a3\u5c42\u4e0d\u5b58\u5728\uff0c\u76f4\u63a5 break\uff08\u56e0\u4e3a\u66f4\u9ad8\u5c42\u80af\u5b9a\u4e5f\u6ca1\u6709\uff09\n            if (update&#91;i]-&gt;forward&#91;i] != current) break;\n          \n            \/\/ \u4f7f\u5f97\u524d\u9a71\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\u53d8\u6210\u76ee\u6807\u8282\u70b9\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\uff0c\u5373\u65ad\u5f00\u76ee\u6807\u8282\u70b9\u7684\u94fe\u63a5\uff0c\u8df3\u8fc7\u76ee\u6807\u8282\u70b9\n            update&#91;i]-&gt;forward&#91;i] = current-&gt;forward&#91;i]; \n        }\n\n        \/\/ \u5220\u9664\u5143\u7d20\u540e\u53ef\u80fd\u5bfc\u81f4\u9876\u5c42\u6ca1\u6709\u5143\u7d20\u4e86\uff0c\u9700\u8981\u5220\u9664\u9876\u5c42\n        while (_skip_list_level &gt; 0 &amp;&amp; _header-&gt;forward&#91;_skip_list_level] == 0)\n        {\n            _skip_list_level--;\n        }\n\n        std::cout &lt;&lt; \"Successfully deleted key \" &lt;&lt; key &lt;&lt; std::endl;\n        delete current; \/\/ \u91ca\u653e\u5185\u5b58\n        _element_count--;\n    }\n    mtx.unlock(); \/\/ \u89e3\u9501\n\n    return;\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5220\u9664\u5143\u7d20\u65f6\uff0c\u9996\u5148\u4f7f\u7528\u4e92\u65a5\u9501\u4fdd\u62a4\u4e34\u754c\u533a\u3002<\/li>\n\n\n\n<li>\u4ece\u6700\u9ad8\u5c42\u7ea7\u5f00\u59cb\u67e5\u627e\u8981\u5220\u9664\u7684\u8282\u70b9\uff0c\u8bb0\u5f55\u6bcf\u4e2a\u5c42\u7ea7\u5f85\u5220\u9664\u5143\u7d20\u7684\u524d\u9a71\u8282\u70b9\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u627e\u5230\u8981\u5220\u9664\u7684\u8282\u70b9\uff0c\u5c06\u5176\u4ece\u6bcf\u4e2a\u5c42\u7ea7\u4e2d\u65ad\u94fe\uff0c\u5982\u679c\u6700\u9ad8\u5c42\u6ca1\u5143\u7d20\u4e86\uff0c\u5219\u9700\u8981\u5220\u9664\u6700\u9ad8\u5c42\uff0c\u66f4\u65b0\u5c42\u7ea7\u548c\u5143\u7d20\u6570\u91cf\u3002<\/li>\n\n\n\n<li>\u6700\u540e\u7269\u7406\u91ca\u653e\u5220\u9664\u8282\u70b9\uff0c\u91ca\u653e\u4e92\u65a5\u9501\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">5 \u67e5\u627e\u5143\u7d20<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nbool SkipList&lt;K, V&gt;::search_element(K key)\n{\n\n    std::cout &lt;&lt; \"search_element-----------------\" &lt;&lt; std::endl;\n    Node&lt;K, V&gt; *current = _header;\n\n    \/\/ \u4ece\u6700\u9ad8\u5c42\u5f00\u59cb\u627e\n    for (int i = _skip_list_level; i &gt;= 0; i--)\n    {\n        while (current-&gt;forward&#91;i] &amp;&amp; current-&gt;forward&#91;i]-&gt;get_key() &lt; key)\n        {\n            \/\/ \u5728\u5f53\u524d\u5c42\u91cc\uff0c\u53ea\u8981\u4e0b\u4e00\u4e2a\u8282\u70b9 key &lt; \u76ee\u6807 key \u5c31\u53f3\u79fb\uff0c\u76f8\u5f53\u4e8e\u5728\u5c42\u202fi \u4e0a\u4e00\u6b21\u6027\u8de8\u8d8a\u82e5\u5e72\u8282\u70b9\uff0c\u76f4\u5230\u5373\u5c06\u8d85\u8d8a\u76ee\u6807\n            \/\/ \u5230\u4e86\u4e0b\u4e00\u5c42\u65f6\uff0ccurrent \u5df2\u7ecf\u5b9a\u4f4d\u5728\u6700\u63a5\u8fd1\u76ee\u6807\u4e14\u4e0d\u8d85\u8fc7\u5b83\u7684\u8282\u70b9\uff0c\u7ee7\u7eed\u4e0b\u63a2\n            current = current-&gt;forward&#91;i];\n        }\n    }\n\n    \/\/ \u5230\u8fbe\u5e95\u5c42\u5e76\u5c06\u6307\u9488\u63a8\u8fdb\u5230\u6211\u4eec\u4e4b\u524d\u5b9a\u4f4d\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\n    current = current-&gt;forward&#91;0];\n\n    \/\/ \u5982\u679c\u8fd9\u4e2a\u8282\u70b9\u5c31\u662f\u6211\u4eec\u8981\u7684\n    if (current and current-&gt;get_key() == key)\n    {\n        std::cout &lt;&lt; \"Found key: \" &lt;&lt; key &lt;&lt; \", value: \" &lt;&lt; current-&gt;get_value() &lt;&lt; std::endl;\n        return true;\n    }\n\n    std::cout &lt;&lt; \"Not Found Key:\" &lt;&lt; key &lt;&lt; std::endl;\n    \n    return false;\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4ece\u6700\u9ad8\u5c42\u7ea7\u5f00\u59cb\u67e5\u627e\u8981\u67e5\u627e\u7684\u8282\u70b9\uff0c\u627e\u5230\u5219\u8f93\u51fa\u4fe1\u606f\u5e76\u8fd4\u56de <code>true<\/code>\uff0c\u5426\u5219\u8f93\u51fa\u4fe1\u606f\u5e76\u8fd4\u56de <code>false<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">6 \u6570\u636e\u843d\u76d8<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nvoid SkipList&lt;K, V&gt;::dump_file()\n{\n    std::cout &lt;&lt; \"dump_file-----------------\" &lt;&lt; std::endl;\n    _file_writer.open(STORE_FILE);\n    Node&lt;K, V&gt; *node = this-&gt;_header-&gt;forward&#91;0];\n\n    while (node != NULL)\n    {\n        _file_writer &lt;&lt; node-&gt;get_key() &lt;&lt; \":\" &lt;&lt; node-&gt;get_value() &lt;&lt; \"\\n\";\n        std::cout &lt;&lt; node-&gt;get_key() &lt;&lt; \":\" &lt;&lt; node-&gt;get_value() &lt;&lt; \";\\n\";\n        node = node-&gt;forward&#91;0];\n    }\n\n    _file_writer.flush();\n    _file_writer.close();\n    \n    return;\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6253\u5f00\u5b58\u50a8\u6587\u4ef6\uff0c\u5c06\u8df3\u8868\u4e2d\u7684\u6240\u6709\u8282\u70b9\u7684\u952e\u548c\u503c\u5199\u5165\u6587\u4ef6\uff0c\u6700\u540e\u5173\u95ed\u6587\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">7 \u52a0\u8f7d\u6570\u636e<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6253\u5f00\u5b58\u50a8\u6587\u4ef6\uff0c\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\uff0c\u89e3\u6790\u51fa\u952e\u548c\u503c\uff0c\u63d2\u5165\u5230\u8df3\u8868\u4e2d\uff0c\u6700\u540e\u5173\u95ed\u6587\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">8 \u89e3\u6790\u5b57\u7b26\u4e32<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>get_key_value_from_string<\/code> \u65b9\u6cd5\u4ece\u5b57\u7b26\u4e32\u4e2d\u89e3\u6790\u51fa\u952e\u548c\u503c\u3002<\/li>\n\n\n\n<li><code>is_valid_string<\/code> \u65b9\u6cd5\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u5206\u9694\u7b26\uff0c\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">9 \u663e\u793a\u8df3\u8868<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u904d\u5386\u6bcf\u4e2a\u5c42\u7ea7\uff0c\u8f93\u51fa\u8be5\u5c42\u7ea7\u7684\u6240\u6709\u8282\u70b9\u7684\u952e\u548c\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">10 \u83b7\u53d6\u8df3\u8868\u5927\u5c0f <\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd4\u56de\u8df3\u8868\u4e2d\u5f53\u524d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5c06\u8df3\u8868\u690d\u5165\u672c\u9879\u76ee<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">1 \u4fee\u6539 dump_file \u548c load_file \u63a5\u53e3<\/h4>\n\n\n\n<p>\u4e0a\u8ff0\u8df3\u8868\u4e2d\u7684\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u903b\u8f91\u662f\u76f4\u63a5\u843d\u76d8\u548c\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u4ee5\u843d\u76d8\u65b9\u6cd5\u4e3e\u4f8b\uff0c\u5173\u952e\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>while (node != NULL)\n{\n    _file_writer &lt;&lt; node-&gt;get_key() &lt;&lt; \":\" &lt;&lt; node-&gt;get_value() &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; node-&gt;get_key() &lt;&lt; \":\" &lt;&lt; node-&gt;get_value() &lt;&lt; \";\\n\";\n    node = node-&gt;forward&#91;0];\n}<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d <code>_file_writer<\/code> \u7684\u5b9a\u4e49\u662f <code>std::ofstream _file_writer<\/code>\uff0c \u4ee3\u7801\u903b\u8f91\u4e3a\u5728\u904d\u5386\u7684\u8fc7\u7a0b\u4e2d\u4e0d\u65ad\u5c06\u6570\u636e\u5199\u5165\u5230\u78c1\u76d8\uff0c\u4f7f\u7528 : \u548c \\n \u4f5c\u4e3a\u5206\u9694\u7b26\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u8fd9\u91cc\u5c31\u5b58\u5728\u6570\u636e\u4e0d\u5b89\u5168\u7684\u95ee\u9898\uff0c\u5373 key \u548c value \u4e2d\u5982\u679c\u5df2\u7ecf\u5b58\u5728 : \u6216 \\n \u5b57\u7b26\uff0c\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u53d1\u751f\u5f02\u5e38\u3002\u4e3a\u4e86\u6570\u636e\u5b89\u5168\uff0c\u8fd9\u91cc\u91c7\u7528\u7684\u65b9\u6cd5\u4f9d\u65e7\u662f\u4f7f\u7528 boost \u7684\u5e8f\u5217\u5316\u5e93\u3002\u65b0\u589e <code>SkipListDump<\/code> \u7c7b\uff0c\u76ee\u7684\u5c31\u662f\u5b9e\u73b0\u5b89\u5168\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u3002\u5176\u5b9a\u4e49\u4e5f\u5f88\u7b80\u5355\uff0c\u4e0e raft \u548c kvServer \u4e2d\u7684\u5e8f\u5217\u5316\u65b9\u5f0f\u76f8\u540c\uff0c\u4e5f\u662f boost \u5e93\u5e8f\u5217\u5316\u7684\u6700\u7b80\u5355\u7684\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nclass SkipListDump {\n   public:\n    friend class boost::serialization::access;\n\n    template &lt;class Archive&gt;\n    void serialize(Archive &amp;ar, const unsigned int version) {\n        ar &amp; keyDumpVt_;\n        ar &amp; valDumpVt_;\n    }\n    std::vector&lt;K&gt; keyDumpVt_;\n    std::vector&lt;V&gt; valDumpVt_;\n\n   public:\n    void insert(const Node&lt;K, V&gt; &amp;node);\n};<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nvoid SkipListDump&lt;K, V&gt;::insert(const Node&lt;K, V&gt; &amp;node) {\n    keyDumpVt_.emplace_back(node.get_key());\n    valDumpVt_.emplace_back(node.get_value());\n}<\/code><\/pre>\n\n\n\n<p>\u90a3\u4e48\u6539\u9020\u540e\u7684\u843d\u76d8\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nstd::string SkipList&lt;K, V&gt;::dump_file() {\n    Node&lt;K, V&gt; *node = this-&gt;_header-&gt;forward&#91;0];\n    SkipListDump&lt;K, V&gt; dumper;\n    while (node != nullptr) {\n        dumper.insert(*node);\n        node = node-&gt;forward&#91;0];\n    }\n    std::stringstream ss;\n    boost::archive::text_oarchive oa(ss);\n    oa &lt;&lt; dumper;\n    return ss.str();\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">2 \u65b0\u589e insert_set_element \u63a5\u53e3<\/h4>\n\n\n\n<p>\u589e\u52a0\u7684\u539f\u56e0\u662f\u4e3a\u4e86\u914d\u5408\u4e0b\u5c42 kvServer \u7684 set \u65b9\u6cd5\uff0c\u5982\u679c key \u4e0d\u5b58\u5728\u5c31\u589e\u52a0\u8fd9\u4e2a key\uff0c\u5982\u679c key \u5df2\u7ecf\u5b58\u5728\u5c31\u5c06 value \u4fee\u6539\u6210\u65b0\u503c\u3002\u8fd9\u4e2a\u4f5c\u7528\u4e0e <code>insert_element<\/code> \u65b9\u6cd5\u7c7b\u4f3c\uff0c\u4f46\u5b83\u53ea\u80fd\u63d2\u5165\u65b0\u5143\u7d20\uff0c\u5b58\u5728\u76f8\u540c key \u4e0d\u4f1a\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>template &lt;typename K, typename V&gt;\nvoid SkipList&lt;K, V&gt;::insert_set_element(K &amp;key, V &amp;value) {\n    V oldValue;\n    if (search_element(key, oldValue)) {\n        delete_element(key);\n    }\n    insert_element(key, value);\n}<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f <code>insert_set_element<\/code> \u65b9\u6cd5\u5728\u5b9e\u73b0\u4fee\u6539\u5143\u7d20\u529f\u80fd\u65f6\u4e0d\u80fd\u76f4\u63a5\u627e\u5230\u8fd9\u4e2a\u8282\u70b9\uff0c\u7136\u540e\u4fee\u6539\u5176\u503c\uff0c\u56e0\u4e3a\u540e\u7eed\u53ef\u80fd\u4f1a\u6709\u7c7b\u4f3c\u201c\u6392\u5e8f\u201d\u8fd9\u6837\u7684\u62d3\u5c55\u529f\u80fd\uff0c\u56e0\u6b64\u76ee\u524d\u7684\u5b9e\u73b0\u601d\u8def\u662f\u5148\u5220\u9664\u65e7\u8282\u70b9\uff0c\u7136\u540e\u518d\u91cd\u65b0\u63d2\u5165\uff0c\u8fbe\u5230\u4fee\u6539 value \u7684\u6548\u679c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e24\u7c7b\u5e8f\u5217\u5316<\/h3>\n\n\n\n<p>1. RPC \u573a\u666f\u4e2d\u4f7f\u7528 protobuf<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RPC\uff08\u8fdc\u7a0b\u8fc7\u7a0b\u8c03\u7528\uff09\u8981\u6c42\u8de8\u8fdb\u7a0b\u751a\u81f3\u8de8\u4e3b\u673a\u901a\u4fe1\uff1b<\/li>\n\n\n\n<li>\u9700\u8981\u9ad8\u6548\u3001\u5e73\u53f0\u65e0\u5173\u7684\u5e8f\u5217\u5316\u65b9\u5f0f\uff1b<\/li>\n\n\n\n<li>protobuf \u662f Google \u5f00\u6e90\u7684\u8de8\u8bed\u8a00\u3001\u9ad8\u6027\u80fd\u5e8f\u5217\u5316\u534f\u8bae\uff0c\u975e\u5e38\u9002\u5408 RPC\u3002<\/li>\n<\/ul>\n\n\n\n<p>2. \u8df3\u8868\uff08SkipList\uff09\u4e2d\u4f7f\u7528 Boost.Serialization<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Boost.Serialization \u662f C++ \u7684\u901a\u7528\u5e8f\u5217\u5316\u5e93\uff0c\u4f7f\u7528\u65b9\u4fbf\uff1b<\/li>\n\n\n\n<li>\u9002\u5408\u672c\u5730\u6301\u4e45\u5316\uff0c\u6bd4\u5982\u628a\u8df3\u8868\u5199\u5165\u78c1\u76d8\u6216\u6587\u4ef6\uff1b<\/li>\n\n\n\n<li>\u4e0d\u4f9d\u8d56\u4e8e\u8de8\u5e73\u53f0\u6216\u591a\u8bed\u8a00\u4f7f\u7528\u573a\u666f\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">RPC <\/h2>\n\n\n\n<p>Raft \u7b97\u6cd5\u4e2d\u670d\u52a1\u5668\u8282\u70b9\u4e4b\u95f4\u4f7f\u7528 RPC \u8fdb\u884c\u901a\u4fe1\uff0c\u5e76\u4e14 <strong>Raft \u4e2d\u53ea\u6709\u4e24\u79cd\u4e3b\u8981\u7684 RPC<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RequestVote RPC\uff08\u8bf7\u6c42\u6295\u7968\uff09\uff1a\u7531 candidate \u5728<strong>\u9009\u4e3e<\/strong>\u671f\u95f4\u53d1\u8d77\u3002<\/li>\n\n\n\n<li>AppendEntries RPC\uff08\u8ffd\u52a0\u6761\u76ee\uff09\uff1a\u7531 leader \u53d1\u8d77\uff0c\u7528\u6765<strong>\u590d\u5236\u65e5\u5fd7<\/strong>\u548c\u63d0\u4f9b\u4e00\u79cd<strong>\u5fc3\u8df3<\/strong>\u673a\u5236\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u670d\u52a1\u5668\u4e4b\u95f4\u901a\u4fe1\u7684\u65f6\u5019\u4f1a\u4ea4\u6362\u5f53\u524d\u4efb\u671f\u53f7\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u4e00\u4e2a\u670d\u52a1\u5668\u4e0a\u7684\u5f53\u524d\u4efb\u671f\u53f7\u6bd4\u5176\u4ed6\u7684\u5c0f\uff0c\u8be5\u670d\u52a1\u5668\u4f1a\u5c06\u81ea\u5df1\u7684\u4efb\u671f\u53f7\u66f4\u65b0\u4e3a\u8f83\u5927\u7684\u90a3\u4e2a\u503c\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u4e00\u4e2a candidate \u6216\u8005 leader \u53d1\u73b0\u81ea\u5df1\u7684\u4efb\u671f\u53f7\u8fc7\u671f\u4e86\uff0c\u5b83\u4f1a\u7acb\u5373\u56de\u5230 follower \u72b6\u6001\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u4e00\u4e2a\u8282\u70b9\u63a5\u6536\u5230\u4e00\u4e2a\u5305\u542b\u8fc7\u671f\u7684\u4efb\u671f\u53f7\u7684\u8bf7\u6c42\uff0c\u5b83\u4f1a\u76f4\u63a5\u62d2\u7edd\u8fd9\u4e2a\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u672c\u9879\u76ee\u4f7f\u7528\u7684 RPC \u9ad8\u5ea6\u4f9d\u8d56\u4e8e <code><strong>portobuf<\/strong><\/code>\uff0c<code>rpcheader.proto<\/code> \u6587\u4ef6\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>syntax = \"proto3\";\npackage RPC;\nmessage RpcHeader\n{\n    bytes service_name = 1;\n    bytes method_name = 2;\n    uint32 args_size = 3; \/\/ \u867d\u7136\u662f uint32\uff0c\u4f46 protobuf \u7f16\u7801\u7684\u65f6\u5019\u9ed8\u8ba4\u5c31\u662f\u53d8\u957f\u7f16\u7801\n}<\/code><\/pre>\n\n\n\n<p>\u7531 <code>rpcheader.proto<\/code> \u6587\u4ef6\u6267\u884c\u547d\u4ee4 <code>protoc --cpp_out=. rpcheader.proto<\/code> \u540e\uff0c\u4f1a\u81ea\u52a8\u751f\u6210\u5982\u4e0b\u4e24\u4e2a\u6587\u4ef6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>rpcheader.pb.h<\/code>\uff1a\u5305\u542b\u7ed3\u6784\u4f53\u7c7b\u58f0\u660e\u3001\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u63a5\u53e3\u7b49\u3002<\/li>\n\n\n\n<li><code>rpcheader.pb<\/code><code>.cpp<\/code>\uff1a\u5305\u542b <code>.h<\/code> \u4e2d\u58f0\u660e\u7684\u7c7b\u7684\u5b9a\u4e49\u3001\u5e8f\u5217\u5316\u903b\u8f91\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<p>RPC\uff08Remote Procedure Call\uff0c\u8fdc\u7a0b\u8fc7\u7a0b\u8c03\u7528\uff09\u662f\u4e00\u79cd\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u8ba9\u4e0d\u540c\u6a21\u5757\u4e4b\u95f4\u5b9e\u73b0\u900f\u660e\u8fdc\u7a0b\u8c03\u7528\u7684\u6280\u672f\u3002\u501f\u52a9 RPC\uff0c\u5f00\u53d1\u8005\u80fd\u591f\u66f4\u4fbf\u6377\u5730\u6784\u5efa\u5206\u5e03\u5f0f\u7cfb\u7edf\uff0c\u65e0\u9700\u8fc7\u5ea6\u5173\u6ce8\u590d\u6742\u7684\u5e95\u5c42\u901a\u4fe1\u7ec6\u8282 \uff0c\u8c03\u7528\u53e6\u4e00\u53f0\u673a\u5668\u4e0a\u7684\u65b9\u6cd5\u5c31\u5982\u540c\u8c03\u7528\u672c\u5730\u65b9\u6cd5\u4e00\u6837\u3002\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u8bbe\u8ba1\u4e2d\uff0c\u65e0\u8bba\u7cfb\u7edf\u5bf9\u5916\u5448\u73b0\u4f55\u79cd\u8868\u73b0\u5f62\u5f0f\uff0c\u53ea\u8981\u6d89\u53ca\u591a\u4e2a\u4e3b\u673a\u95f4\u7684\u4ea4\u4e92\u534f\u4f5c\uff0c\u7f51\u7edc\u901a\u8baf\u90fd\u662f\u5176\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5173\u952e\u73af\u8282\u3002RPC \u6280\u672f\u6b63\u662f\u901a\u8fc7\u5bf9\u7f51\u7edc\u901a\u8baf\u8fdb\u884c\u5c01\u88c5\u548c\u4f18\u5316\uff0c\u5b9e\u73b0\u4e86\u8de8\u4e3b\u673a\u65b9\u6cd5\u8c03\u7528\u7684\u9ad8\u6548\u4e0e\u4fbf\u6377\u3002<\/p>\n\n\n\n<p>\u4e00\u6b21 RPC \u6d41\u7a0b\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-15.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"877\" height=\"602\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-15.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-3033\"  sizes=\"auto, (max-width: 877px) 100vw, 877px\" \/><\/div><\/figure>\n\n\n\n<p><strong>\u9996\u5148\uff0c\u201c\u51c6\u5907\u201d\u8fd9\u4e00\u6b65\u9700\u8981\u53d1\u8d77\u8005\u81ea\u5df1\u5b8c\u6210<\/strong>\uff0c\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ stub \u662f\u5ba2\u6237\u7aef\u4f7f\u7528\u7684\u4ee3\u7406\u5bf9\u8c61\uff0c\u76f8\u5f53\u4e8e\u628a\u8fdc\u7a0b\u7684\u65b9\u6cd5\u672c\u5730\u5316\u4e86\nfixbug::FiendServiceRpc_Stub stub(\n    new MprpcChannel(ip, port, true));  \/\/ \u6ce8\u518c\u8fdb\u81ea\u5df1\u5b9e\u73b0\u7684 channel \u7c7b\uff0cchannel \u7c7b\u7528\u4e8e\u81ea\u5b9a\u4e49\u53d1\u9001\u683c\u5f0f\u548c\u8d1f\u8d23\u5e8f\u5217\u5316\u7b49\u64cd\u4f5c\n\/\/ rpc \u65b9\u6cd5\u7684\u8bf7\u6c42\u53c2\u6570\nfixbug::GetFriendsListRequest request;\nrequest.set_userid(1000);\n\/\/ rpc \u65b9\u6cd5\u7684\u54cd\u5e94\nfixbug::GetFriendsListResponse response;\n\/\/ controller \u7528\u6765\u76d1\u63a7\u4e00\u6b21 RPC \u8c03\u7528\u662f\u5426\u5931\u8d25\uff08\u6bd4\u5982\u7f51\u7edc\u65ad\u4e86\uff09 \nMprpcController controller; \n\u00b7\u00b7\u00b7\n\/\/ \u53d1\u8d77 rpc \u65b9\u6cd5\u7684\u8c03\u7528\uff0c\u5b9e\u9645\u5185\u90e8\u4f1a\u8c03\u7528 channel \u7684 call_method \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u96c6\u4e2d\u6765\u505a\u6240\u6709 rpc \u8c03\u7528\u7684\u53c2\u6570\u5e8f\u5217\u5316\u548c\u7f51\u7edc\u53d1\u9001\u529f\u80fd   \n    stub.GetFriendsList(&amp;controller, &amp;request, &amp;response, nullptr);\n <\/code><\/pre>\n\n\n\n<p><code>GetFriendsList()<\/code>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void FiendServiceRpc_Stub::GetFriendsList(::PROTOBUF_NAMESPACE_ID::RpcController* controller,\n                                          const ::fixbug::GetFriendsListRequest* request,\n                                          ::fixbug::GetFriendsListResponse* response,\n                                          ::google::protobuf::Closure* done) {\n    channel_-&gt;CallMethod(descriptor()-&gt;method(0), controller, request, response, done);\n}<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\u5b9e\u9645\u662f\u8c03\u7528\u4e86 <code>channel_-&gt;CallMethod<\/code> \u65b9\u6cd5\uff0c\u53ea\u662f\u7b2c\u4e00\u4e2a\u53c2\u6570\u53d8\u6210\u4e86 <code>descriptor()-&gt;method(0)<\/code>\uff0c\u5176\u4ed6\u53c2\u6570\u90fd\u662f\u6211\u4eec\u5728 <code>GetFriendsList()<\/code> \u4e2d\u4f20\u8fdb\u53bb\u7684\u53c2\u6570\uff0c\u800c\u8fd9\u4e2a <code>descriptor()-&gt;method(0)<\/code> \u7684\u4f5c\u7528\u5c31\u662f\u8868\u660e\u6211\u4eec\u5230\u5e95\u662f\u8c03\u7528\u7684\u662f\u54ea\u4e2a\u5177\u4f53\u7684\u65b9\u6cd5\uff08\u6bd4\u5982 get\u3001put \u7b49\u7b49)\u3002<\/p>\n\n\n\n<p>\u5230\u8fd9\u91cc\u8fdc\u7aef\u8c03\u7528\u9700\u8981\u7684\u4e1c\u897f\u5c31\u9f50\u5168\u4e86\uff1a\u5177\u4f53\u65b9\u6cd5\u3001\u8bf7\u6c42\u53c2\u6570\u3001\u54cd\u5e94\u53c2\u6570\u3002<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u5728\u6700\u5f00\u59cb\u751f\u6210 <code>stub <\/code>\u7684\u4ee3\u7801\u662f\uff1a<\/p>\n\n\n\n<p><code>fixbug::FiendServiceRpc_Stub stub(new MprpcChannel(ip, port, true));<\/code><\/p>\n\n\n\n<p>\u5176\u5b9e <code>GetFriendsList()<\/code> \u4e2d\u7684 <code>channel_<\/code> \u672c\u8d28\u4e0a\u5c31\u662f\u6211\u4eec\u81ea\u5df1\u5b9e\u73b0\u7684 <code>MprpcChannel<\/code> \u7c7b\uff0c\u800c <code>channel_-&gt;CallMethod<\/code> \u672c\u8d28\u4e0a\u5c31\u662f\u8c03\u7528\u7684 <code>MprpChannel<\/code> \u7c7b\u7684 <code>CallMethod<\/code> \u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>\u90a3\u6211\u4eec\u770b\u4e0b\u8fd9\u4e2a <code>CallMethod<\/code> \u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * header_size + header(service_name method_name args_size) + args\n * \u6240\u6709\u901a\u8fc7 stub \u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u7684 rpc \u65b9\u6cd5\uff0c\u90fd\u4f1a\u5230\u8fd9\u91cc\u7edf\u4e00\u901a\u8fc7 rpcChannel \u6765\u8c03\u7528\u65b9\u6cd5\uff0c\u7edf\u4e00\u505a\u6570\u636e\u5e8f\u5217\u5316\u548c\u7f51\u7edc\u53d1\u9001\n *\/\nvoid MprpcChannel::CallMethod(const google::protobuf::MethodDescriptor* method,\n                              google::protobuf::RpcController* controller, const google::protobuf::Message* request,\n                              google::protobuf::Message* response, google::protobuf::Closure* done) {\n        \/\/ \u5982\u679c\u4e4b\u524d\u8fde\u63a5\u65ad\u4e86\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a -1\uff09\uff0c\u5c31\u5c1d\u8bd5\u91cd\u65b0\u5efa\u7acb TCP \u8fde\u63a5\uff0c\u5931\u8d25\u65f6\u8bbe\u7f6e controller \u7684\u9519\u8bef\u4fe1\u606f\u5e76\u8fd4\u56de\n        if (m_clientFd == -1) { \n        std::string errMsg;\n        bool rt = newConnect(m_ip.c_str(), m_port, &amp;errMsg);\n        if (!rt) {\n            DPrintf(\"&#91;func-MprpcChannel::CallMethod]\u91cd\u8fde\u63a5ip\uff1a{%s} port{%d}\u5931\u8d25\", m_ip.c_str(), m_port);\n            controller-&gt;SetFailed(errMsg);\n            return;\n        } else {\n            DPrintf(\"&#91;func-MprpcChannel::CallMethod]\u8fde\u63a5ip\uff1a{%s} port{%d}\u6210\u529f\", m_ip.c_str(), m_port);\n        }\n    }\n\n    \/\/ \u901a\u8fc7 MethodDescriptor* \u4e2d\u7684 ServiceDescriptor* \u83b7\u53d6\u8981\u8c03\u7528\u7684\u670d\u52a1\u540d\u548c\u65b9\u6cd5\u540d\n    const google::protobuf::ServiceDescriptor* sd = method-&gt;service();\n    std::string service_name = sd-&gt;name();     \/\/ service_name\n    std::string method_name = method-&gt;name();  \/\/ method_name\n\n    \/\/ \u5c06 protobuf \u7c7b\u578b\u7684\u8bf7\u6c42\u5bf9\u8c61 request \u5e8f\u5217\u5316\u6210\u5b57\u7b26\u4e32\uff0c\u5f97\u5230\u5176\u5927\u5c0f args_size \u7528\u4e8e header \u586b\u5199\n    uint32_t args_size{};\n    std::string args_str;\n    if (request-&gt;SerializeToString(&amp;args_str)) {\n        args_size = args_str.size();\n    } else {\n        controller-&gt;SetFailed(\"serialize request error!\");\n        return;\n    }\n\n    \/\/ \u6784\u9020\u81ea\u5b9a\u4e49 RpcHeader \u5934\u90e8\n    \/\/ \u81ea\u5b9a\u4e49\u7684 RpcHeader \u662f\u5728\u81ea\u5df1\u6846\u67b6\u4e2d\u5b9a\u4e49\u7684\u4e00\u4e2a protobuf \u7c7b\u578b\uff0c\u7528\u6765\u63cf\u8ff0\u4e00\u6b21\u8c03\u7528\u5143\u4fe1\u606f\uff0c\u5305\u62ec\uff1a\u670d\u52a1\u540d\u3001\u65b9\u6cd5\u540d\u3001\u53c2\u6570\u957f\u5ea6\n    RPC::RpcHeader rpcHeader;\n    rpcHeader.set_service_name(service_name);\n    rpcHeader.set_method_name(method_name);\n    rpcHeader.set_args_size(args_size);\n\n    \/\/ \u5c06 RpcHeader \u5e8f\u5217\u5316\n    std::string rpc_header_str;\n    if (!rpcHeader.SerializeToString(&amp;rpc_header_str)) {\n        controller-&gt;SetFailed(\"serialize rpc header error!\");\n        return;\n    }\n\n    \/\/ \u4f7f\u7528 protobuf \u7684 CodedOutputStream \u6765\u6784\u5efa\u53d1\u9001\u7684\u6570\u636e\u6d41\n    std::string send_rpc_str;  \/\/ \u7528\u6765\u4fdd\u5b58\u6700\u7ec8\u53d1\u9001\u7684\u6570\u636e\n    {\n        \/\/ \u521b\u5efa\u4e00\u4e2a StringOutputStream \u7528\u4e8e\u5199\u5165 send_rpc_str\n        google::protobuf::io::StringOutputStream string_output(&amp;send_rpc_str);\n        google::protobuf::io::CodedOutputStream coded_output(&amp;string_output);\n\n        \/\/ \u5148\u5199\u5165 header \u7684\u957f\u5ea6\uff08\u53d8\u957f\u7f16\u7801\uff09\n        coded_output.WriteVarint32(static_cast&lt;uint32_t&gt;(rpc_header_str.size()));\n\n        \/\/ \u7136\u540e\u5199\u5165 rpc_header \u672c\u8eab\n        coded_output.WriteString(rpc_header_str);\n    }\n\n    \/\/ \u6700\u540e\u628a\u53c2\u6570\u5185\u5bb9\u62fc\u63a5\u5230\u53d1\u9001\u6570\u636e\u672b\u5c3e \n    send_rpc_str += args_str;\n\n    \/\/ \u6700\u7ec8\u683c\u5f0f\uff1aheader_size + header(service_name method_name args_size) + args\n\n    \/\/ \u4f7f\u7528 send \u51fd\u6570\u5faa\u73af\u53d1\u9001 RPC \u8bf7\u6c42\n    \/\/ \u5982\u679c send \u5931\u8d25\uff0c\u8bf4\u660e\u8fde\u63a5\u53ef\u80fd\u65ad\u4e86\uff0c\u5c31\u5173\u95ed\u65e7\u8fde\u63a5\u5e76\u91cd\u8fde\uff0c\u7136\u540e\u91cd\u53d1\uff0c\u5982\u679c\u8fd8\u662f\u5931\u8d25\uff0c\u76f4\u63a5 return\n    while (-1 == send(m_clientFd, send_rpc_str.c_str(), send_rpc_str.size(), 0)) {\n        char errtxt&#91;512] = {0};\n        sprintf(errtxt, \"send error! errno:%d\", errno);\n        std::cout &lt;&lt; \"\u5c1d\u8bd5\u91cd\u65b0\u8fde\u63a5\uff0c\u5bf9\u65b9ip\uff1a\" &lt;&lt; m_ip &lt;&lt; \" \u5bf9\u65b9\u7aef\u53e3\" &lt;&lt; m_port &lt;&lt; std::endl;\n        close(m_clientFd);\n        m_clientFd = -1;\n        std::string errMsg;\n        bool rt = newConnect(m_ip.c_str(), m_port, &amp;errMsg);\n        if (!rt) {\n            controller-&gt;SetFailed(errMsg);\n            return;\n        }\n    }\n    \n    \/\/ \u4ece\u65f6\u95f4\u8282\u70b9\u6765\u8bf4\uff0c\u8fd9\u91cc\u5c06\u8bf7\u6c42\u53d1\u9001\u8fc7\u53bb\u4e4b\u540e\uff0cRPC \u670d\u52a1\u7684\u63d0\u4f9b\u8005\u5c31\u4f1a\u5f00\u59cb\u5904\u7406\uff0c\u63a5\u6536\u54cd\u5e94\u7684\u65f6\u5019\u5c31\u4ee3\u8868\u5df2\u7ecf\u8fd4\u56de\u54cd\u5e94\u4e86\n  \n    \/\/ \u63a5\u6536 RPC \u8bf7\u6c42\u7684\u54cd\u5e94\u7ed3\u679c\uff0c\u7f13\u5b58\u5728 recv_buf \u4e2d\n    char recv_buf&#91;1024] = {0};\n    int recv_size = 0;\n    if (-1 == (recv_size = recv(m_clientFd, recv_buf, 1024, 0))) {\n        close(m_clientFd);\n        m_clientFd = -1;\n        char errtxt&#91;512] = {0};\n        sprintf(errtxt, \"recv error! errno:%d\", errno);\n        controller-&gt;SetFailed(errtxt);\n        return;\n    }\n\n    \/\/ \u53cd\u5e8f\u5217\u5316 RPC \u8c03\u7528\u7684\u54cd\u5e94\u7ed3\u679c\uff0c\u628a server \u8fd4\u56de\u7684\u6570\u636e\u53cd\u5e8f\u5217\u5316\u586b\u5165\u8c03\u7528\u8005\u63d0\u4f9b\u7684 response \u5bf9\u8c61 \n    \/\/ \u4f7f\u7528 ParseFromArray\uff08\u800c\u975e ParseFromString\uff09\u662f\u4e3a\u4e86\u907f\u514d \\0 \u622a\u65ad\u95ee\u9898 \n    if (!response-&gt;ParseFromArray(recv_buf, recv_size)) {\n        char errtxt&#91;1050] = {0};\n        sprintf(errtxt, \"parse error! response_str:%s\", recv_buf);\n        controller-&gt;SetFailed(errtxt);\n        return;\n    }\n}\n <\/code><\/pre>\n\n\n\n<p>\u5373\u6309\u7167 <code>header_size + header(service_name method_name args_size) + args<\/code> \u7684\u683c\u5f0f\u5c06\u53d1\u9001\u5185\u5bb9\u5e8f\u5217\u5316\uff0c\u7136\u540e\u901a\u8fc7 <code>send<\/code> \u51fd\u6570\u5faa\u73af\u53d1\u9001\uff0c\u6700\u540e\u63a5\u6536\u54cd\u5e94\u6570\u636e\u3002\u6ce8\u610f\uff1a\u5e8f\u5217\u5316\u4e3a\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u53ea\u4e0d\u8fc7\u7528 <code>string<\/code> \u50a8\u5b58\uff0c\u56e0\u4e3a <code>std::string<\/code> \u5728 C++ \u4e2d\u4e0d\u4ec5\u662f\u6587\u672c\u5bb9\u5668\uff0c\u4e5f\u662f\u4e00\u4e2a\u65b9\u4fbf\u7684\u5b57\u8282\u7f13\u51b2\u533a\u3002<\/p>\n\n\n\n<p><strong>\u901a\u8fc7\u4e0a\u9762\u7684\u6b65\u9aa4\uff0c\u6240\u6709\u7684\u62a5\u6587\u90fd\u5df2\u53d1\u9001\u5230\u4e86\u5bf9\u7aef\uff0c\u5373\u63a5\u6536 RPC \u7684\u4e00\u65b9\uff0c\u90a3\u4e48\u6b64\u65f6\u5728\u5bf9\u7aef\u8fdb\u884c\u4e0b\u56fe\u6240\u793a\u6b65\u9aa4\uff1a<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-19.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"531\" height=\"708\" data-original=\"https:\/\/guapicoding.com\/wp-content\/uploads\/2025\/04\/image-19.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-3047\"  sizes=\"auto, (max-width: 531px) 100vw, 531px\" \/><\/div><\/figure>\n<\/div>\n\n\n<p>\u8fd9\u4e00\u7cfb\u5217\u6b65\u9aa4\u7684\u4e3b\u8981\u53d1\u751f\u5728\u51fd\u6570 <code>RpcProvider::OnMessage<\/code> \u4e2d\uff0c\u6574\u4e2a\u6d41\u7a0b\u53ef\u4ee5\u6982\u62ec\u4e3a\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u63a5\u6536\u8bf7\u6c42 \u2192 \u89e3\u6790\u6570\u636e \u2192 \u67e5\u627e\u670d\u52a1\u4e0e\u65b9\u6cd5 \u2192 \u53cd\u5e8f\u5217\u5316\u53c2\u6570 \u2192 \u8c03\u7528\u4e1a\u52a1\u65b9\u6cd5 \u2192 \u5f02\u6b65\u8fd4\u56de\u7ed3\u679c<\/strong><\/p>\n\n\n\n<p>\u6574\u4f53\u6570\u636e\u7ed3\u6784\uff1a<br>[4\u5b57\u8282 header_size][rpc_header\uff08protobuf\uff09][args \u53c2\u6570\u90e8\u5206\uff08protobuf\uff09]<\/p>\n\n\n\n<p>rpc_header \u672c\u8eab\u662f\u4e2a protobuf \u6d88\u606f\uff0c\u5185\u5bb9\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>service_name<\/li>\n\n\n\n<li>method_name<\/li>\n\n\n\n<li>args_size<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5982\u679c\u8fdc\u7a0b\u6709\u4e00\u4e2a RPC \u670d\u52a1\u7684\u8c03\u7528\u8bf7\u6c42\uff0c\u90a3\u4e48 OnMessage \u65b9\u6cd5\u5c31\u4f1a\u54cd\u5e94\n\/\/ \u56e0\u6b64\u672c\u51fd\u6570\u7684\u4f5c\u7528\u662f\uff1a\u89e3\u6790\u8bf7\u6c42\uff0c\u7136\u540e\u6839\u636e\u670d\u52a1\u540d\u3001\u65b9\u6cd5\u540d\u548c\u53c2\u6570\uff0c\u6765\u8c03\u7528 service \u7684 callmethod \u6765\u8c03\u7528\u672c\u5730\u7684\u4e1a\u52a1\nvoid RpcProvider::OnMessage(const muduo::net::TcpConnectionPtr &amp;conn, muduo::net::Buffer *buffer, muduo::Timestamp) {\n    \/\/ \u4ece\u7f51\u7edc\u7f13\u51b2\u533a\u8bfb\u53d6\u6240\u6709\u6570\u636e\uff0c\u5305\u542b\uff1aheader_size + rpc_header + args\n    std::string recv_buf = buffer-&gt;retrieveAllAsString();\n\n    \/\/ \u4f7f\u7528 protobuf \u7684 CodedInputStream \u6765\u89e3\u6790\u6570\u636e\u6d41\n    google::protobuf::io::ArrayInputStream array_input(recv_buf.data(), recv_buf.size());\n    google::protobuf::io::CodedInputStream coded_input(&amp;array_input);\n\n    uint32_t header_size{};\n    coded_input.ReadVarint32(&amp;header_size);  \/\/ \u89e3\u6790\u51fa header_size\n\n    \/\/ \u6839\u636e header_size \u8bfb\u53d6\u6570\u636e\u5934\u90e8\u7684\u539f\u59cb\u5b57\u8282\u6d41\uff0c\u53cd\u5e8f\u5217\u5316\u6570\u636e\uff0c\u5f97\u5230 RPC \u8bf7\u6c42\u7684\u8be6\u7ec6\u4fe1\u606f\n    std::string rpc_header_str;\n    RPC::RpcHeader rpcHeader;\n    std::string service_name;\n    std::string method_name;\n\n    \/\/ \u8bbe\u7f6e\u8bfb\u53d6\u9650\u5236\uff0c\u4e0d\u5fc5\u62c5\u5fc3\u6570\u636e\u8bfb\u591a\n    google::protobuf::io::CodedInputStream::Limit msg_limit = coded_input.PushLimit(header_size);\n    \n    coded_input.ReadString(&amp;rpc_header_str, header_size); \/\/ \u89e3\u6790\u51fa header\n\n    \/\/ \u6062\u590d\u4e4b\u524d\u7684\u9650\u5236\uff0c\u4ee5\u4fbf\u5b89\u5168\u5730\u7ee7\u7eed\u8bfb\u53d6\u5176\u4ed6\u6570\u636e\n    coded_input.PopLimit(msg_limit);\n\n    uint32_t args_size{};\n    \/\/ \u5bf9\u6570\u636e\u5934\u90e8\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\uff0c\u5f97\u5230 service_name\u3001method_name\u3001args_size\n    if (rpcHeader.ParseFromString(rpc_header_str)) {\n        service_name = rpcHeader.service_name();\n        method_name = rpcHeader.method_name();\n        args_size = rpcHeader.args_size();\n    } else {\n        \/\/ \u53cd\u5e8f\u5217\u5316\u5931\u8d25\n        std::cout &lt;&lt; \"rpc_header_str:\" &lt;&lt; rpc_header_str &lt;&lt; \" parse error!\" &lt;&lt; std::endl;\n        return;\n    }\n\n    \/\/ \u89e3\u6790\u8c03\u7528\u65b9\u6cd5\u6240\u9700\u8981\u7684\u5b9e\u9645\u53c2\u6570\u90e8\u5206 args\n    std::string args_str; \/\/ \u83b7\u53d6 RPC \u65b9\u6cd5\u53c2\u6570\u7684\u5b57\u7b26\u6d41\u6570\u636e\n\n    \/\/ \u76f4\u63a5\u8bfb\u53d6 args_size \u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u6570\u636e\n    bool read_args_success = coded_input.ReadString(&amp;args_str, args_size);\n\n    \/\/ \u5904\u7406\u9519\u8bef\uff1a\u53c2\u6570\u6570\u636e\u8bfb\u53d6\u5931\u8d25\n    if (!read_args_success) {\n        return;\n    }\n\n    \/\/ \u6253\u5370\u8c03\u8bd5\u4fe1\u606f\n    \/\/    std::cout &lt;&lt; \"============================================\" &lt;&lt; std::endl;\n    \/\/    std::cout &lt;&lt; \"header_size: \" &lt;&lt; header_size &lt;&lt; std::endl;\n    \/\/    std::cout &lt;&lt; \"rpc_header_str: \" &lt;&lt; rpc_header_str &lt;&lt; std::endl;\n    \/\/    std::cout &lt;&lt; \"service_name: \" &lt;&lt; service_name &lt;&lt; std::endl;\n    \/\/    std::cout &lt;&lt; \"method_name: \" &lt;&lt; method_name &lt;&lt; std::endl;\n    \/\/    std::cout &lt;&lt; \"args_str: \" &lt;&lt; args_str &lt;&lt; std::endl;\n    \/\/    std::cout &lt;&lt; \"============================================\" &lt;&lt; std::endl;\n\n    \/\/ \u67e5\u627e\u670d\u52a1\u4e0e\u65b9\u6cd5\n    \/\/ \u6846\u67b6\u9884\u5148\u6ce8\u518c\u4e86\u672c\u5730\u670d\u52a1\uff0c\u8fd9\u91cc\u67e5\u627e\u51fa\u5bf9\u5e94\u7684\u65b9\u6cd5\u5bf9\u8c61 \n    auto it = m_serviceMap.find(service_name);\n    if (it == m_serviceMap.end()) {\n        std::cout &lt;&lt; \"\u670d\u52a1\uff1a\" &lt;&lt; service_name &lt;&lt; \" is not exist!\" &lt;&lt; std::endl;\n        std::cout &lt;&lt; \"\u5f53\u524d\u5df2\u7ecf\u6709\u7684\u670d\u52a1\u5217\u8868\u4e3a:\";\n        for (auto item : m_serviceMap) {\n            std::cout &lt;&lt; item.first &lt;&lt; \" \";\n        }\n        std::cout &lt;&lt; std::endl;\n        return;\n    }\n\n    auto mit = it-&gt;second.m_methodMap.find(method_name);\n    if (mit == it-&gt;second.m_methodMap.end()) {\n        std::cout &lt;&lt; service_name &lt;&lt; \":\" &lt;&lt; method_name &lt;&lt; \" is not exist!\" &lt;&lt; std::endl;\n        return;\n    }\n\n    google::protobuf::Service *service = it-&gt;second.m_service;       \/\/ \u83b7\u53d6 service \u5bf9\u8c61   \n    const google::protobuf::MethodDescriptor *method = mit-&gt;second;  \/\/ \u83b7\u53d6 method \u5bf9\u8c61   \n\n    \/\/ \u751f\u6210 RPC \u65b9\u6cd5\u8c03\u7528\u7684\u8bf7\u6c42 request \u548c\u54cd\u5e94 response  \n    google::protobuf::Message *request = service-&gt;GetRequestPrototype(method).New();\n\n    \/\/ \u5229\u7528 request \u5bf9\u8c03\u7528\u65b9\u6cd5\u6240\u9700\u8981\u7684\u5b9e\u9645\u53c2\u6570\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\n    if (!request-&gt;ParseFromString(args_str)) {\n        std::cout &lt;&lt; \"request parse error, content:\" &lt;&lt; args_str &lt;&lt; std::endl;\n        return;\n    }\n    google::protobuf::Message *response = service-&gt;GetResponsePrototype(method).New();\n\n    \/**\n     * \u7ed9\u4e0b\u9762 method \u65b9\u6cd5\u7684\u8c03\u7528\uff0c\u7ed1\u5b9a\u4e00\u4e2a Closure \u56de\u8c03\u51fd\u6570\uff0c\u9700\u8981\u5b8c\u6210\u5e8f\u5217\u5316\u548c\u53cd\u5411\u53d1\u9001\u8bf7\u6c42\u7684\u64cd\u4f5c\n     * Closure \u662f protobuf \u63d0\u4f9b\u7684\u6cdb\u578b\u56de\u8c03\u63a5\u53e3\uff08\u7c7b\u4f3c\u51fd\u6570\u6307\u9488\uff09\n     * \u5f53\u4e1a\u52a1\u65b9\u6cd5\u6267\u884c\u5b8c\u65f6\uff0c\u4f1a\u81ea\u52a8\u8c03\u7528 SendRpcResponse\uff0c\u5c06 response \u5e8f\u5217\u5316\u5e76\u901a\u8fc7 TCP \u53d1\u9001\u56de\u5ba2\u6237\u7aef\n     * \u8fd9\u79cd\u56de\u8c03\u673a\u5236\u7684\u597d\u5904\u662f\uff1a\u4e1a\u52a1\u903b\u8f91\u548c\u7f51\u7edc\u901a\u4fe1\u89e3\u8026\uff0c\u4e1a\u52a1\u53ea\u8d1f\u8d23\u8bbe\u7f6e\u597d response\uff0c\u771f\u6b63\u53d1\u9001\u7531\u6846\u67b6\u81ea\u52a8\u5904\u7406\n     *\/\n    google::protobuf::Closure *done =\n        google::protobuf::NewCallback&lt;RpcProvider, const muduo::net::TcpConnectionPtr &amp;, google::protobuf::Message *&gt;(\n            this, &amp;RpcProvider::SendRpcResponse, conn, response);\n\n    \/\/ \u771f\u6b63\u8c03\u7528\u65b9\u6cd5\n    service-&gt;CallMethod(method, nullptr, request, response, done);\n    \n    \/**\n     * CallMethod \u52a8\u6001\u5206\u53d1\u673a\u5236\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u901a\u8fc7 service-&gt;CallMethod \u6765\u76f4\u63a5\u8c03\u7528\u5177\u4f53\u7684\u4e1a\u52a1\u65b9\u6cd5\uff1f\n     * \u6211\u4eec\u6ce8\u518c\u7684 service \u5b9e\u4f8b\u7ee7\u627f\u81ea .proto \u6587\u4ef6\u751f\u6210\u7684 serviceRpc \u7c7b\uff0c\u800c ServiceRpc \u53c8\u7ee7\u627f\u81ea google::protobuf::Service\n     * \u5728 ServiceRpc \u4e2d\u91cd\u5199\u4e86 Service \u7684\u7eaf\u865a\u51fd\u6570 CallMethod\uff0c\u8be5\u51fd\u6570\u5185\u90e8\u4f1a\u6839\u636e\u4f20\u5165\u7684 method \u63cf\u8ff0\u7b26\u81ea\u52a8\u8c03\u7528\u5bf9\u5e94\u7684\u4e1a\u52a1\u65b9\u6cd5\uff08\u5982 Login\uff09\n     * \u800c\u8fd9\u4e9b\u5177\u4f53\u7684\u4e1a\u52a1\u65b9\u6cd5\uff08\u5982 Login\uff09\u53c8\u88ab\u6211\u4eec\u7528\u6237\u81ea\u5b9a\u4e49\u7684 service \u7c7b\u91cd\u5199\u4e86\n     * \u6240\u4ee5\u5f53\u8c03\u7528 CallMethod \u65f6\uff0c\u5b9e\u9645\u4e0a\u6700\u7ec8\u4f1a\u6267\u884c\u6211\u4eec\u5728\u7528\u6237\u81ea\u5b9a\u4e49\u7684 service \u7c7b\u4e2d\u5b9e\u73b0\u7684\u5177\u4f53\u4e1a\u52a1\u903b\u8f91\n     *\/\n}<\/code><\/pre>\n\n\n\n<p>\u4e3a\u4ec0\u4e48 <code>CallMethod<\/code> \u65b9\u6cd5\u53ef\u4ee5\u8c03\u7528\u5230\u672c\u5730\u7684\u65b9\u6cd5\uff1f\u8fd9\u4e2a\u51fd\u6570\u4f1a\u56e0\u4e3a\u591a\u6001\u5b9e\u9645\u8c03\u7528\u751f\u6210\u7684 pb.cc \u6587\u4ef6\u4e2d\u7684 <code>CallMethod<\/code> \u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>switch (method-&gt;index()) {\n    case 0:\n        GetFriendsList(controller,\n                           ::PROTOBUF_NAMESPACE_ID::internal::DownCast&lt;const ::fixbug::GetFriendsListRequest*&gt;(request),\n                           ::PROTOBUF_NAMESPACE_ID::internal::DownCast&lt;::fixbug::GetFriendsListResponse*&gt;(response),\n                           done);\n        break;\n    default:\n        GOOGLE_LOG(FATAL) &lt;&lt; \"Bad method index; this should never happen.\";\n        break;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u51fd\u6570\u548c\u4e0a\u9762\u8bb2\u8fc7\u7684 <code>FiendServiceRpc stub::GetFriendsList<\/code> \u65b9\u6cd5\u76f8\u4f3c\uff0c\u90fd\u662f\u901a\u8fc7 xxx-&gt;index \u6765\u8c03\u7528\u5b9e\u9645\u7684\u65b9\u6cd5\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\u4f1a\u89e6\u53d1case 0\uff0c\u7136\u540e\u4f1a\u8c03\u7528\u6211\u4eec\u5728 FiendService \u4e2d\u91cd\u5199\u7684 GetfiendsList \u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>\u7b80\u5355\u7406\u89e3\uff1a\u5c31\u7b97\u6211\u4eec\u6ca1\u6709\u91cd\u5199 goole.:service\u4e2d \u7684 callmethod\uff0c\u4f46\u662f protoc \u751f\u6210\u7684 serviceRpc \u91cd\u5199\u4e86 callmethod\uff0c\u5f53\u6211\u4eec\u4f7f\u7528\u8fd9\u4e2a\u91cd\u5199\u7684 callmethod \u8c03\u7528 xxx \u65b9\u6cd5\u5c31\u4f1a\u56e0\u4e3a\u591a\u6001\u8c03\u7528\u5230\u6211\u4eec service \u91cd\u5199\u7684 Getfiendslist \u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u91cd\u5199\u57fa\u7c7b\u65b9\u6cd5\nvoid GetFriendsList(::google::protobuf::RpcController *controller, \n                    const ::fixbug::GetFriendsListRequest *request,\n                    ::fixbug::GetFriendsListResponse *response, \n                    ::google::protobuf::Closure *done) {\n    uint32_t userid = request-&gt;userid();\n    std::vector&lt;std::string&gt; friendsList = GetFriendsList(userid);\n    response-&gt;mutable_result()-&gt;set_errcode(0);\n    response-&gt;mutable_result()-&gt;set_errmsg(\"\");\n    for (std::string &amp;name : friendsList) {\n        std::string *p = response-&gt;add_friends();\n        *p = name;\n    }\n    done-&gt;Run();\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u51fd\u6570\u7684\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\uff1a\u8c03\u7528\u672c\u5730\u7684\u65b9\u6cd5\uff0c\u586b\u5145\u8fd4\u56de\u503c response\uff0c\u7136\u540e\u8c03\u7528\u56de\u8c03\u51fd\u6570 done-&gt;Run()\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u524d\u9762\u6ce8\u518c\u7684 Closure \u7c7b\u578b\u56de\u8c03\u51fd\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>google::protobuf::Closure *done = google::protobuf::NewCallback&lt;RpcProvider, const muduo::net::TcpConnectionPtr &amp;, google::protobuf::Message *&gt;(this, &amp;RpcProvider::SendRpcResponse, conn, response);<\/code><\/pre>\n\n\n\n<p>\u5728\u56de\u8c03\u771f\u6b63\u6267\u884c\u4e4b\u524d\uff0c\u6211\u4eec\u7684\u672c\u5730\u65b9\u6cd5\u5df2\u7ecf\u6267\u884c\u4e86\u5e76\u586b\u5145\u5b8c\u8fd4\u56de\u503c\uff0c\u90a3\u4e48\u6211\u4eec\u8fd8\u9700\u8981\u5e8f\u5217\u5316\u8fd4\u56de\u7ed3\u679c\u5e76\u5c06\u5e8f\u5217\u5316\u540e\u7684\u6570\u636e\u53d1\u9001\u7ed9\u5bf9\u7aef\u3002\u56de\u8c03\u51fd\u6570 done-&gt;Run() \u5c31\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd\uff0c\u5b83\u5b9e\u9645\u8c03\u7528\u7684\u662f RpcProvider::SendRpcResponse\u3002 <\/p>\n\n\n\n<p>\u5230\u8fd9\u91cc\uff0cRPC \u63d0\u4f9b\u65b9\u7684\u6d41\u7a0b\u5c31\u7ed3\u675f\u4e86\u3002<br>\u4ece\u65f6\u95f4\u8282\u70b9\u6765\u8bf4\uff0c\u6b64\u65f6\u5e94\u8be5\u5bf9\u7aef\u6765\u63a5\u6536\u8fd4\u56de\u503c\u4e86\uff0c\u63a5\u6536\u90e8\u5206\u4e5f\u5c31\u662f\u5728\u8fd9\u4e00\u8282\u6700\u4e0a\u9762\u7684 <code>MprpcChannel::CallMethod<\/code> \u51fd\u6570\u4e2d\u7684\u4e0b\u534a\u90e8\u5206\uff0c\u5c06\u53d1\u8fc7\u6765\u7684\u7684\u6570\u636e\u53cd\u5e8f\u5217\u5316\u5373\u53ef\u3002 <\/p>\n\n\n\n<p>\u76ee\u524d\u6211\u4eec\u7684 RPC \u662f\u4e0d\u652f\u6301\u5f02\u6b65\u7684\uff0c\u56e0\u4e3a\u5728 MprpcChannel::CallMethod \u65b9\u6cd5\u4e2d\u53d1\u9001\u5b8c\u6570\u636e\u540e\u5c31\u4f1a\u4e00\u76f4\u7b49\u5f85\u7740\u63a5\u6536\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1a\u76ee\u524d\u5b9e\u73b0\u7684 RPC \u7684\u7f51\u7edc\u901a\u4fe1\u91c7\u7528\u7684\u662f muduo \u7f51\u7edc\u5e93\uff0cmuduo \u652f\u6301\u51fd\u6570\u56de\u8c03\uff0c\u5373\u5728\u5bf9\u7aef\u53d1\u9001\u4fe1\u606f\u6765\u4e4b\u540e\u5c31\u4f1a\u8c03\u7528\u6ce8\u518c\u597d\u7684\u51fd\u6570\uff0c\u51fd\u6570\u6ce8\u518c\u4ee3\u7801\u5728\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m_muduo_server-&gt;setMessageCallback(\n            std::bind(&amp;RpcProvider::OnMessage, this, \n            std::placeholders::_1, \n            std::placeholders::_2, \n            std::placeholders::_3));<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e2a\u4eba\u8d21\u732e<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8df3\u8868\u6a21\u5757\uff08SkipList\uff09<\/strong>\uff1a\u5b9e\u73b0\u8df3\u8868\u6570\u636e\u7ed3\u6784\uff0c\u5e76\u57fa\u4e8e Boost Serialization \u5b9e\u73b0\u4e86\u6570\u636e\u7684\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\uff0c\u786e\u4fdd\u5176\u53ef\u4ee5\u5b89\u5168\u6301\u4e45\u5316\uff1b<\/li>\n\n\n\n<li><strong>KV Server \u6a21\u5757<\/strong>\uff1a\u8d1f\u8d23\u5c06\u4e0a\u5c42\u5ba2\u6237\u7aef\u7684\u64cd\u4f5c\u8f6c\u5316\u4e3a Raft \u65e5\u5fd7\uff0c\u901a\u8fc7\u72b6\u6001\u673a\u6700\u7ec8\u843d\u76d8\uff1b<\/li>\n\n\n\n<li><strong>RPC \u901a\u4fe1\u7cfb\u7edf<\/strong>\uff1a\u6211\u7528 protobuf \u81ea\u5df1\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5316\u7248\u7684 RPC \u6846\u67b6\uff0c\u5b8c\u6210 Raft \u8282\u70b9\u95f4\u7684\u901a\u4fe1\uff1b<\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u4ea4\u4e92\u6a21\u5757<\/strong>\uff1a\u7528\u4e8e\u6784\u9020 Put\/Get \u8bf7\u6c42\u5e76\u4e0e\u96c6\u7fa4\u4ea4\u4e92\uff0c\u5177\u5907\u5bb9\u9519\u548c\u91cd\u8bd5\u673a\u5236<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Raft \u7b97\u6cd5 Raft \u4f5c\u4e3a\u7ecf\u5178\u7684\u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u7b97\u6cd5\uff0c\u65e8\u5728\u5b9e\u73b0\u591a\u8282\u70b9\u72b6\u6001\u673a\u7684\u9ad8\u53ef\u9760\u4e00\u81f4\u6027\u3002 Raft \u7b97\u6cd5\u7531  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69],"tags":[27,21,103,104,106],"class_list":["post-2976","post","type-post","status-publish","format-standard","hentry","category-project","tag-c","tag-linux","tag-raft","tag-104","tag-106"],"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/2976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2976"}],"version-history":[{"count":81,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/2976\/revisions"}],"predecessor-version":[{"id":3652,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/2976\/revisions\/3652"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}