{"id":36,"date":"2021-01-11T12:13:57","date_gmt":"2021-01-11T04:13:57","guid":{"rendered":"https:\/\/similiaotian.com\/?p=36"},"modified":"2021-01-11T12:13:57","modified_gmt":"2021-01-11T04:13:57","slug":"%e8%af%b4%e5%88%b0%e5%88%86%e5%b8%83%e5%bc%8f%ef%bc%8c%e9%87%8d%e8%a6%81%e7%9a%84paxos%e7%ae%97%e6%b3%95%e4%bd%a0%e7%9c%8b%e9%80%8f%e4%ba%86%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/99.feige5.com\/?p=36","title":{"rendered":"\u8bf4\u5230\u5206\u5e03\u5f0f\uff0c\u91cd\u8981\u7684Paxos\u7b97\u6cd5\u4f60\u770b\u900f\u4e86\u4e48\uff1f"},"content":{"rendered":"\n<p>\u5f00\u6e90\u5206\u5e03\u5f0f\u9501\u7ec4\u4ef6 Google Chubby \u7684\u4f5c\u8005 Mike Burrows \u8bf4\u2014\u2014<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u4e16\u754c\u4e0a\u53ea\u6709\u4e00\u79cd\u4e00\u81f4\u6027\u7b97\u6cd5\uff0c\u90a3\u5c31\u662f Paxos \u7b97\u6cd5\uff0c\u5176\u4ed6\u7684\u7b97\u6cd5\u90fd\u662f\u6b8b\u6b21\u54c1\u3002<\/p>\n\n\n\n<p>Paxos \u7b97\u6cd5\u867d\u7136\u91cd\u8981\uff0c\u4f46\u4e5f\u590d\u6742\u3002<\/p>\n\n\n\n<p>Quorum \u673a\u5236<\/p>\n\n\n\n<p>\u5728\u8bf4 Paxos \u7b97\u6cd5\u4e4b\u524d\uff0c\u5148\u6765\u770b\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684 Quorum \u9009\u4e3e\u7b97\u6cd5\u3002<\/p>\n\n\n\n<p>\u5728\u5404\u79cd\u4e00\u81f4\u6027\u7b97\u6cd5\u4e2d\u90fd\u53ef\u4ee5\u770b\u5230 Quorum \u673a\u5236\u7684\u8eab\u5f71\uff0c\u4e3b\u8981\u6570\u5b66\u601d\u60f3\u6765\u6e90\u4e8e\u62bd\u5c49\u539f\u7406\uff1a\u5728 N \u4e2a\u526f\u672c\u4e2d\uff0c\u4e00\u6b21\u66f4\u65b0\u6210\u529f\u7684\u5982\u679c\u6709 W \u4e2a\uff0c\u90a3\u4e48\u6211\u5728\u8bfb\u53d6\u6570\u636e\u65f6\u662f\u8981\u4ece\u5927\u4e8e N\uff0dW \u4e2a\u526f\u672c\u4e2d\u8bfb\u53d6\uff0c\u8fd9\u6837\u5c31\u80fd\u81f3\u5c11\u8bfb\u5230\u4e00\u4e2a\u66f4\u65b0\u7684\u6570\u636e\u4e86\u3002<\/p>\n\n\n\n<p>\u548c Quorum \u673a\u5236\u5bf9\u5e94\u7684\u662f WARO\uff08Write All Read one\uff09\uff0c\u662f\u4e00\u79cd\u7b80\u5355\u7684\u526f\u672c\u63a7\u5236\u534f\u8bae\uff0c\u5f53 Client \u8bf7\u6c42\u5411\u67d0\u526f\u672c\u5199\u6570\u636e\u65f6\uff08\u66f4\u65b0\u6570\u636e\uff09\uff0c\u53ea\u6709\u5f53\u6240\u6709\u7684\u526f\u672c\u90fd\u66f4\u65b0\u6210\u529f\u4e4b\u540e\uff0c\u8fd9\u6b21\u5199\u64cd\u4f5c\u624d\u7b97\u6210\u529f\uff0c\u5426\u5219\u89c6\u4e3a\u5931\u8d25\u3002<\/p>\n\n\n\n<p>WARO \u4f18\u5148\u4fdd\u8bc1\u8bfb\u670d\u52a1\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86\u6240\u6709\u7684\u526f\u672c\u4e00\u81f4\uff0c\u53ea\u9700\u8981\u8bfb\u4efb\u4f55\u4e00\u4e2a\u526f\u672c\u4e0a\u7684\u6570\u636e\u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u5199\u670d\u52a1\u7684\u53ef\u7528\u6027\u8f83\u4f4e\uff0c\u5047\u8bbe\u6709 N \u4e2a\u526f\u672c\uff0cN\uff0d1 \u4e2a\u90fd\u5b95\u673a\u4e86\uff0c\u5269\u4e0b\u7684\u90a3\u4e2a\u526f\u672c\u4ecd\u80fd\u63d0\u4f9b\u8bfb\u670d\u52a1\uff1b\u4f46\u662f\u53ea\u8981\u6709\u4e00\u4e2a\u526f\u672c\u5b95\u673a\u4e86\uff0c\u5199\u670d\u52a1\u5c31\u4e0d\u4f1a\u6210\u529f\u3002<\/p>\n\n\n\n<p>WARO \u727a\u7272\u4e86\u66f4\u65b0\u670d\u52a1\u7684\u53ef\u7528\u6027\uff0c\u6700\u5927\u7a0b\u5ea6\u5730\u589e\u5f3a\u4e86\u8bfb\u670d\u52a1\u7684\u53ef\u7528\u6027\uff0c\u800c Quorum \u5c31\u662f\u5728\u66f4\u65b0\u670d\u52a1\u548c\u8bfb\u670d\u52a1\u4e4b\u95f4\u8fdb\u884c\u7684\u4e00\u4e2a\u6298\u8877\u3002<\/p>\n\n\n\n<p>1. Quorum \u5b9a\u4e49<\/p>\n\n\n\n<p>Quorum \u7684\u5b9a\u4e49\u5982\u4e0b\u2014\u2014<\/p>\n\n\n\n<p>\u5047\u8bbe\u6709 N \u4e2a\u526f\u672c\uff0c\u66f4\u65b0\u64cd\u4f5c wi \u5728 W \u4e2a\u526f\u672c\u4e2d\u66f4\u65b0\u6210\u529f\u4e4b\u540e\uff0c\u624d\u8ba4\u4e3a\u6b64\u6b21\u66f4\u65b0\u64cd\u4f5c wi \u6210\u529f\uff0c\u628a\u8fd9\u6b21\u6210\u529f\u63d0\u4ea4\u7684\u66f4\u65b0\u64cd\u4f5c\u5bf9\u5e94\u7684\u6570\u636e\u53eb\u4f5c\u201c\u6210\u529f\u63d0\u4ea4\u7684\u6570\u636e\u201d\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u8bfb\u64cd\u4f5c\u800c\u8a00\uff0c\u81f3\u5c11\u9700\u8981\u8bfb R \u4e2a\u526f\u672c\u624d\u80fd\u8bfb\u5230\u6b64\u6b21\u66f4\u65b0\u7684\u6570\u636e\uff0c\u5176\u4e2d\uff0cW+R&gt;N \uff0c\u5373 W \u548c R \u6709\u91cd\u53e0\uff0c\u4e00\u822c\uff0cW+R=N+1\u3002<\/p>\n\n\n\n<p>N = \u5b58\u50a8\u6570\u636e\u526f\u672c\u7684\u6570\u91cf<\/p>\n\n\n\n<p>W = \u66f4\u65b0\u6210\u529f\u6240\u9700\u7684\u526f\u672c<\/p>\n\n\n\n<p>R = \u4e00\u6b21\u6570\u636e\u5bf9\u8c61\u8bfb\u53d6\u8981\u8bbf\u95ee\u7684\u526f\u672c\u7684\u6570\u91cf<\/p>\n\n\n\n<p>Quorum \u5c31\u662f\u9650\u5b9a\u4e86\u4e00\u6b21\u9700\u8981\u8bfb\u53d6\u81f3\u5c11 N+1-W \u7684\u526f\u672c\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u7ef4\u62a4\u4e86 10 \u4e2a\u526f\u672c\uff0c\u4e00\u6b21\u6210\u529f\u66f4\u65b0\u4e86 3 \u4e2a\uff0c\u90a3\u4e48\u81f3\u5c11\u9700\u8981\u8bfb\u53d6 8 \u4e2a\u526f\u672c\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u6211\u4eec\u8bfb\u5230\u6700\u65b0\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>2. Quorum \u7684\u5e94\u7528<\/p>\n\n\n\n<p>Quorum \u673a\u5236\u65e0\u6cd5\u4fdd\u8bc1\u5f3a\u4e00\u81f4\u6027\uff0c\u4e5f\u5c31\u662f\u65e0\u6cd5\u5b9e\u73b0\u4efb\u4f55\u65f6\u523b\u4efb\u4f55\u7528\u6237\u6216\u8282\u70b9\u90fd\u53ef\u4ee5\u8bfb\u5230\u6700\u8fd1\u4e00\u6b21\u6210\u529f\u63d0\u4ea4\u7684\u526f\u672c\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u914d\u5408\u4e00\u4e2a\u83b7\u53d6\u6700\u65b0\u6210\u529f\u63d0\u4ea4\u7684\u7248\u672c\u53f7\u7684 metadata \u670d\u52a1\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u5b9a\u6700\u65b0\u5df2\u7ecf\u6210\u529f\u63d0\u4ea4\u7684\u7248\u672c\u53f7\uff0c\u7136\u540e\u4ece\u5df2\u7ecf\u8bfb\u5230\u7684\u6570\u636e\u4e2d\u5c31\u53ef\u4ee5\u786e\u8ba4\u6700\u65b0\u5199\u5165\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>Quorum \u662f\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u5e38\u7528\u7684\u4e00\u79cd\u673a\u5236\uff0c\u7528\u6765\u4fdd\u8bc1\u6570\u636e\u5197\u4f59\u548c\u6700\u7ec8\u4e00\u81f4\u6027\u7684\u6295\u7968\u7b97\u6cd5\uff0c\u5728 Paxos\u3001Raft \u548c ZooKeeper \u7684 Zab \u7b49\u7b97\u6cd5\u4e2d\uff0c\u90fd\u53ef\u4ee5\u770b\u5230 Quorum \u673a\u5236\u7684\u5e94\u7528\u3002<\/p>\n\n\n\n<p>Paxos<\/p>\n\n\n\n<p>1. Paxos \u7684\u8282\u70b9\u89d2\u8272<\/p>\n\n\n\n<p>\u5728 Paxos \u534f\u8bae\u4e2d\uff0c\u6709\u4e09\u7c7b\u8282\u70b9\u89d2\u8272\uff0c\u5206\u522b\u662fProposer\u3001Acceptor\u548cLearner\uff0c\u53e6\u5916\u8fd8\u6709\u4e00\u4e2aClient\u4f5c\u4e3a\u4ea7\u751f\u8bae\u9898\u8005\u3002<\/p>\n\n\n\n<p>\u4e0a\u8ff0\u4e09\u7c7b\u89d2\u8272\u53ea\u662f\u903b\u8f91\u4e0a\u7684\u5212\u5206\uff0c\u5728\u5de5\u4f5c\u5b9e\u8df5\u4e2d\uff0c\u4e00\u4e2a\u8282\u70b9\u53ef\u4ee5\u540c\u65f6\u5145\u5f53\u8fd9\u4e09\u7c7b\u89d2\u8272\u3002<\/p>\n\n\n\n<p>Proposer \u63d0\u6848\u8005<\/p>\n\n\n\n<p>\u5728\u6d41\u7a0b\u5f00\u59cb\u65f6\uff0cProposer \u63d0\u51fa\u8bae\u6848\uff0c\u4e5f\u5c31\u662f value\u3002\u5728\u5de5\u7a0b\u4e2d value \u53ef\u4ee5\u662f\u4efb\u4f55\u64cd\u4f5c\uff0c\u6bd4\u5982\u201c\u4fee\u6539\u67d0\u4e2a\u53d8\u91cf\u7684\u503c\u4e3a\u67d0\u4e2a\u65b0\u503c\u201d\u3002<\/p>\n\n\n\n<p>Proposer \u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u4e0d\u540c\u7684 Proposer \u53ef\u4ee5\u63d0\u51fa\u4e0d\u540c\u7684\u751a\u81f3\u77db\u76fe\u7684 value\uff0c\u6bd4\u5982\u67d0\u4e2a Proposer \u63d0\u8bae\u201c\u5c06\u53d8\u91cfX\u8bbe\u7f6e\u4e3a1\u201d\uff0c\u53e6\u4e00\u4e2a Proposer \u63d0\u8bae\u201c\u5c06\u53d8\u91cfX\u8bbe\u7f6e\u4e3a2\u201d\uff0c\u4f46\u5bf9\u540c\u4e00\u8f6e Paxos \u8fc7\u7a0b\uff0c\u6700\u591a\u53ea\u6709\u4e00\u4e2a value \u88ab\u6279\u51c6\u3002<\/p>\n\n\n\n<p>Acceptor \u6279\u51c6\u8005<\/p>\n\n\n\n<p>\u5728\u96c6\u7fa4\u4e2d\uff0cAcceptor \u6709 N \u4e2a\uff0cAcceptor \u4e4b\u95f4\u5b8c\u5168\u5bf9\u7b49\u72ec\u7acb\uff0cProposer \u63d0\u51fa\u7684 value \u5fc5\u987b\u83b7\u5f97\u8d85\u8fc7\u534a\u6570\uff08N\/2+1\uff09\u7684 Acceptor \u6279\u51c6\u540e\u624d\u80fd\u901a\u8fc7\u3002<\/p>\n\n\n\n<p>Learner \u5b66\u4e60\u8005<\/p>\n\n\n\n<p>Learner \u4e0d\u53c2\u4e0e\u9009\u4e3e\uff0c\u800c\u662f\u5b66\u4e60\u88ab\u6279\u51c6\u7684 value\uff0c\u5728 Paxos \u4e2d\uff0cLearner \u4e3b\u8981\u53c2\u4e0e\u76f8\u5173\u7684\u72b6\u6001\u673a\u540c\u6b65\u6d41\u7a0b\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc Leaner \u7684\u6d41\u7a0b\u5c31\u53c2\u8003\u4e86 Quorum \u8bae\u4f1a\u673a\u5236\uff0c\u67d0\u4e2a value \u9700\u8981\u83b7\u5f97 W=N\/2+1 \u7684 Acceptor \u6279\u51c6\uff0cLearner \u9700\u8981\u81f3\u5c11\u8bfb\u53d6 N\/2+1 \u4e2a Accpetor\uff0c\u6700\u591a\u8bfb\u53d6 N \u4e2a Acceptor \u7684\u7ed3\u679c\u540e\uff0c\u624d\u80fd\u5b66\u4e60\u5230\u4e00\u4e2a\u901a\u8fc7\u7684 value\u3002<\/p>\n\n\n\n<p>Client \u4ea7\u751f\u8bae\u9898\u8005<\/p>\n\n\n\n<p>Client \u4f5c\u4e3a\u4ea7\u751f\u8bae\u9898\u8005\uff0c\u5b9e\u9645\u4e0d\u53c2\u4e0e\u9009\u4e3e\u8fc7\u7a0b\uff0c\u6bd4\u5982\u53d1\u8d77\u4fee\u6539\u8bf7\u6c42\u7684\u6765\u6e90\u7b49\u3002<\/p>\n\n\n\n<p>2. Proposer \u4e0e Acceptor \u4e4b\u95f4\u7684\u4ea4\u4e92<\/p>\n\n\n\n<p>Paxos \u4e2d\uff0cProposer \u548c Acceptor \u662f\u7b97\u6cd5\u6838\u5fc3\u89d2\u8272\u3002Paxos \u63cf\u8ff0\u7684\u5c31\u662f\u5728\u4e00\u4e2a\u7531\u591a\u4e2a Proposer \u548c\u591a\u4e2a Acceptor \u6784\u6210\u7684\u7cfb\u7edf\u4e2d\uff0c\u5982\u4f55\u8ba9\u591a\u4e2a Acceptor \u9488\u5bf9 Proposer \u63d0\u51fa\u7684\u591a\u79cd\u63d0\u6848\u8fbe\u6210\u4e00\u81f4\u7684\u8fc7\u7a0b\uff0c\u800c Learner \u53ea\u662f\u201c\u5b66\u4e60\u201d\u6700\u7ec8\u88ab\u6279\u51c6\u7684\u63d0\u6848\u3002<\/p>\n\n\n\n<p>Proposer \u4e0e Acceptor \u4e4b\u95f4\u7684\u4ea4\u4e92\u4e3b\u8981\u6709 4 \u7c7b\u6d88\u606f\u901a\u4fe1\uff0c\u5bf9\u5e94 Paxos \u7b97\u6cd5\u7684\u4e24\u4e2a\u9636\u6bb5 4 \u4e2a\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/25437177-1187a39880ed3e06.image?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/1240\" alt=\"\"\/><\/figure>\n\n\n\n<p>3. Paxos \u9009\u4e3e\u8fc7\u7a0b<\/p>\n\n\n\n<p>\u9009\u4e3e\u8fc7\u7a0b\u53ef\u4ee5\u5206\u4e3a\u4e24\u4e2a\u90e8\u5206\uff0c\u51c6\u5907\u9636\u6bb5\u548c\u9009\u4e3e\u9636\u6bb5\uff0c\u53ef\u4ee5\u67e5\u770b\u4e0b\u9762\u7684\u65f6\u5e8f\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/25437177-ea8d616c0d9b8b03.image?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/1240\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>3.1 Phase 1 \u51c6\u5907\u9636\u6bb5<\/strong><\/p>\n\n\n\n<p>Proposer \u751f\u6210\u5168\u5c40\u552f\u4e00\u4e14\u9012\u589e\u7684 ProposalID\uff0c\u5411 Paxos \u96c6\u7fa4\u7684\u6240\u6709\u673a\u5668\u53d1\u9001 Prepare \u8bf7\u6c42\uff0c\u8fd9\u91cc\u4e0d\u643a\u5e26 value\uff0c\u53ea\u643a\u5e26 N\uff0c\u5373 ProposalID\u3002<\/p>\n\n\n\n<p>Acceptor \u6536\u5230 Prepare \u8bf7\u6c42\u540e\uff0c\u5224\u65ad\u6536\u5230\u7684 ProposalID \u662f\u5426\u6bd4\u4e4b\u524d\u5df2\u54cd\u5e94\u7684\u6240\u6709\u63d0\u6848\u7684 N \u5927\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u662f\uff0c\u5219\u2014\u2014<\/p>\n\n\n\n<p>\u5728\u672c\u5730\u6301\u4e45\u5316N\uff0c\u53ef\u8bb0\u4e3aMax_N<\/p>\n\n\n\n<p>\u56de\u590d\u8bf7\u6c42\uff0c\u5e76\u5e26\u4e0a\u5df2\u7ecf accept \u7684\u63d0\u6848\u4e2dN\u6700\u5927\u7684 value\uff0c\u5982\u679c\u6b64\u65f6\u8fd8\u6ca1\u6709\u5df2\u7ecf accept \u7684\u63d0\u6848\uff0c\u5219\u8fd4\u56de value \u4e3a\u7a7a<\/p>\n\n\n\n<p>\u505a\u51fa\u627f\u8bfa\uff0c\u4e0d\u4f1a accept \u4efb\u4f55\u5c0f\u4e8eMax_N\u7684\u63d0\u6848<\/p>\n\n\n\n<p>\u5982\u679c\u5426\uff0c\u5219\u2014\u2014<\/p>\n\n\n\n<p>\u4e0d\u56de\u590d\u6216\u8005\u56de\u590dError\u3002<\/p>\n\n\n\n<p><strong>3.2 Phase 2 \u9009\u4e3e\u9636\u6bb5<\/strong><\/p>\n\n\n\n<p>\u4e3a\u4e86\u65b9\u4fbf\u63cf\u8ff0\uff0c\u6211\u4eec\u628a Phase 2 \u9009\u4e3e\u9636\u6bb5\u7ee7\u7eed\u62c6\u5206\u4e3a P2a\u3001P2b \u548c P2c\u3002<\/p>\n\n\n\n<p>P2a\uff1aProposer \u53d1\u9001 Accept<\/p>\n\n\n\n<p>\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u540e\uff0cProposer \u6536\u96c6\u5230\u4e00\u4e9b Prepare \u56de\u590d\uff0c\u6709\u4e0b\u5217\u51e0\u79cd\u60c5\u51b5\uff1a<\/p>\n\n\n\n<p>(1) \u82e5\u56de\u590d\u6570\u91cf &gt; \u4e00\u534a\u7684 Acceptor \u6570\u91cf\uff0c\u4e14\u6240\u6709\u56de\u590d\u7684 value \u90fd\u4e3a\u7a7a\u65f6\uff0c\u5219 Porposer \u53d1\u51fa accept \u8bf7\u6c42\uff0c\u5e76\u5e26\u4e0a\u81ea\u5df1\u6307\u5b9a\u7684 value\u3002<\/p>\n\n\n\n<p>(2) \u82e5\u56de\u590d\u6570\u91cf &gt; \u4e00\u534a\u7684 Acceptor \u6570\u91cf\uff0c\u4e14\u6709\u7684\u56de\u590d value \u4e0d\u4e3a\u7a7a\u65f6\uff0c\u5219 Porposer \u53d1\u51fa accept \u8bf7\u6c42\uff0c\u5e76\u5e26\u4e0a\u56de\u590d\u4e2d ProposalID \u6700\u5927\u7684 value\uff0c\u4f5c\u4e3a\u81ea\u5df1\u7684\u63d0\u6848\u5185\u5bb9\u3002<\/p>\n\n\n\n<p>(3) \u82e5\u56de\u590d\u6570\u91cf &lt;= \u4e00\u534a\u7684 Acceptor \u6570\u91cf\u65f6\uff0c\u5219\u5c1d\u8bd5\u66f4\u65b0\u751f\u6210\u66f4\u5927\u7684 ProposalID\uff0c\u518d\u8f6c\u5230\u51c6\u5907\u9636\u6bb5\u6267\u884c\u3002<\/p>\n\n\n\n<p>P2b\uff1aAcceptor \u5e94\u7b54 Accept<\/p>\n\n\n\n<p>Accpetor \u6536\u5230 Accpet \u8bf7\u6c42\u540e\uff0c\u5224\u65ad\uff1a<\/p>\n\n\n\n<p>(1) \u82e5\u6536\u5230\u7684N&gt;=Max_N\uff08\u4e00\u822c\u60c5\u51b5\u4e0b\u662f\u7b49\u4e8e\uff09\uff0c\u5219\u56de\u590d\u63d0\u4ea4\u6210\u529f\uff0c\u5e76\u6301\u4e45\u5316N\u548c value\uff1b<\/p>\n\n\n\n<p>(2) \u82e5\u6536\u5230\u7684N<\/p>\n\n\n\n<p>P2c\uff1aProposer \u7edf\u8ba1\u6295\u7968<\/p>\n\n\n\n<p>\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u540e\uff0cProposer \u4f1a\u6536\u96c6\u5230\u4e00\u4e9b Accept \u56de\u590d\u63d0\u4ea4\u6210\u529f\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\uff1a<\/p>\n\n\n\n<p>(1) \u5f53\u56de\u590d\u6570\u91cf &gt; \u4e00\u534a\u7684 Acceptor \u6570\u91cf\u65f6\uff0c\u5219\u8868\u793a\u63d0\u4ea4 value \u6210\u529f\uff0c\u6b64\u65f6\u53ef\u4ee5\u53d1\u4e00\u4e2a\u5e7f\u64ad\u7ed9\u6240\u6709\u7684 Proposer\u3001Learner\uff0c\u901a\u77e5\u5b83\u4eec\u5df2 commit \u7684 value\uff1b<\/p>\n\n\n\n<p>(2) \u5f53\u56de\u590d\u6570\u91cf &lt;= \u4e00\u534a\u7684 Acceptor \u6570\u91cf\u65f6\uff0c\u5219\u5c1d\u8bd5\u66f4\u65b0\u751f\u6210\u66f4\u5927\u7684 ProposalID\uff0c\u8f6c\u5230\u51c6\u5907\u9636\u6bb5\u6267\u884c\u3002<\/p>\n\n\n\n<p>(3) \u5f53\u6536\u5230\u4e00\u6761\u63d0\u4ea4\u5931\u8d25\u7684\u56de\u590d\u65f6\uff0c\u5219\u5c1d\u8bd5\u66f4\u65b0\u751f\u6210\u66f4\u5927\u7684 ProposalID\uff0c\u4e5f\u4f1a\u8f6c\u5230\u51c6\u5907\u9636\u6bb5\u6267\u884c\u3002<\/p>\n\n\n\n<p>Paxos \u5e38\u89c1\u7684\u95ee\u9898<\/p>\n\n\n\n<p>\u5982\u679c\u534a\u6570\u4ee5\u5185\u7684 Acceptor \u5931\u6548\uff0c\u5982\u4f55\u6b63\u5e38\u8fd0\u884c\uff1f<\/p>\n\n\n\n<p>\u5728 Paxos \u6d41\u7a0b\u4e2d\uff0c\u5982\u679c\u51fa\u73b0\u534a\u6570\u4ee5\u5185\u7684 Acceptor \u5931\u6548\uff0c\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\u79cd\uff0c\u5982\u679c\u534a\u6570\u4ee5\u5185\u7684 Acceptor \u5931\u6548\u65f6\u8fd8\u6ca1\u786e\u5b9a\u6700\u7ec8\u7684 value\uff0c\u6b64\u65f6\u6240\u6709\u7684 Proposer \u4f1a\u91cd\u65b0\u7ade\u4e89\u63d0\u6848\uff0c\u6700\u7ec8\u6709\u4e00\u4e2a\u63d0\u6848\u4f1a\u6210\u529f\u63d0\u4ea4\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e8c\u79cd\uff0c\u5982\u679c\u534a\u6570\u4ee5\u5185\u7684 Acceptor \u5931\u6548\u65f6\u5df2\u786e\u5b9a\u6700\u7ec8\u7684 value\uff0c\u6b64\u65f6\u6240\u6709\u7684 Proposer \u63d0\u4ea4\u524d\u5fc5\u987b\u4ee5\u6700\u7ec8\u7684 value \u63d0\u4ea4\uff0c\u4e5f\u5c31\u662f value \u5b9e\u9645\u5df2\u7ecf\u751f\u6548\uff0c\u6b64\u503c\u53ef\u4ee5\u88ab\u83b7\u53d6\uff0c\u5e76\u4e0d\u518d\u4fee\u6539\u3002<\/p>\n\n\n\n<p>Acceptor \u9700\u8981\u63a5\u53d7\u66f4\u5927\u7684 N\uff0c\u4e5f\u5c31\u662f ProposalID\uff0c\u8fd9\u6709\u4ec0\u4e48\u610f\u4e49\uff1f<\/p>\n\n\n\n<p>\u8fd9\u79cd\u673a\u5236\u53ef\u4ee5\u9632\u6b62\u5176\u4e2d\u4e00\u4e2a Proposer \u5d29\u6e83\u5b95\u673a\u4ea7\u751f\u963b\u585e\u95ee\u9898\uff0c\u5141\u8bb8\u5176\u4ed6 Proposer \u7528\u66f4\u5927 ProposalID \u6765\u62a2\u5360\u4e34\u65f6\u7684\u8bbf\u95ee\u6743\u3002<\/p>\n\n\n\n<p>\u5982\u4f55\u4ea7\u751f\u552f\u4e00\u7684\u7f16\u53f7\uff0c\u4e5f\u5c31\u662f ProposalID\uff1f<\/p>\n\n\n\n<p>\u5728\u300aPaxos made simple\u300b\u7684\u8bba\u6587\u4e2d\u63d0\u5230\uff0c\u552f\u4e00\u7f16\u53f7\u662f\u8ba9\u6240\u6709\u7684 Proposer \u90fd\u4ece\u4e0d\u76f8\u4ea4\u7684\u6570\u636e\u96c6\u5408\u4e2d\u8fdb\u884c\u9009\u62e9\uff0c\u9700\u8981\u4fdd\u8bc1\u5728\u4e0d\u540c Proposer \u4e4b\u95f4\u4e0d\u91cd\u590d\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u7cfb\u7edf\u6709 5 \u4e2a Proposer\uff0c\u5219\u53ef\u4e3a\u6bcf\u4e00\u4e2a Proposer \u5206\u914d\u4e00\u4e2a\u6807\u8bc6j(0~4)\uff0c\u90a3\u4e48\u6bcf\u4e00\u4e2a Proposer \u6bcf\u6b21\u63d0\u51fa\u51b3\u8bae\u7684\u7f16\u53f7\u53ef\u4ee5\u4e3a5*i+j\uff0ci\u53ef\u4ee5\u7528\u6765\u8868\u793a\u63d0\u51fa\u8bae\u6848\u7684\u6b21\u6570\u3002<\/p>\n\n\n\n<p>\u603b\u4e4b\uff0cPaxos \u662f\u7ecf\u5178\u7684\u5206\u5e03\u5f0f\u534f\u8bae\uff0c\u7406\u89e3\u4e86\u4ee5\u540e\uff0c\u5b66\u4e60\u5176\u4ed6\u5206\u5e03\u5f0f\u534f\u8bae\u4f1a\u7b80\u5355\u5f88\u591a\u3002<\/p>\n\n\n\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f00\u6e90\u5206\u5e03\u5f0f\u9501\u7ec4\u4ef6 Google Chubby \u7684\u4f5c\u8005 Mike Burrows \u8bf4\u2014\u2014 \u8fd9\u4e2a\u4e16\u754c\u4e0a\u53ea&hellip; <a href=\"https:\/\/99.feige5.com\/?p=36\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">\u8bf4\u5230\u5206\u5e03\u5f0f\uff0c\u91cd\u8981\u7684Paxos\u7b97\u6cd5\u4f60\u770b\u900f\u4e86\u4e48\uff1f<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-36","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"h-entry","9":"h-as-article"},"_links":{"self":[{"href":"https:\/\/99.feige5.com\/index.php?rest_route=\/wp\/v2\/posts\/36","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/99.feige5.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/99.feige5.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/99.feige5.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/99.feige5.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=36"}],"version-history":[{"count":0,"href":"https:\/\/99.feige5.com\/index.php?rest_route=\/wp\/v2\/posts\/36\/revisions"}],"wp:attachment":[{"href":"https:\/\/99.feige5.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/99.feige5.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/99.feige5.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}