{"id":4317,"date":"2020-05-20T15:53:56","date_gmt":"2020-05-20T07:53:56","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=4317"},"modified":"2020-05-20T15:53:56","modified_gmt":"2020-05-20T07:53:56","slug":"10%e5%88%86%e9%92%9f%e5%bc%84%e6%87%82raft%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/4317","title":{"rendered":"10\u5206\u949f\u5f04\u61c2Raft\u7b97\u6cd5"},"content":{"rendered":"

\u539f\u6587\u5730\u5740<\/a><\/p>\n

 <\/p>\n

\u6587\u7ae0\u6765\u6e90\uff1a\u4f01\u9e45\u53f7 – \u666e\u901a\u7a0b\u5e8f\u5458<\/span><\/div>\n
\n

\u5206\u5e03\u5f0f\u7cfb\u7edf\u5728\u6781\u5927\u63d0\u9ad8\u53ef\u7528\u6027\u3001\u5bb9\u9519\u6027\u7684\u540c\u65f6\uff0c\u5e26\u6765\u4e86\u4e00\u81f4\u6027\u95ee\u9898\uff08CAP\u7406\u8bba\uff09\u3002Raft\u7b97\u6cd5\u80fd\u591f\u89e3\u51b3\u5206\u5e03\u5f0f\u7cfb\u7edf\u73af\u5883\u4e0b\u7684\u4e00\u81f4\u6027\u95ee\u9898\u3002<\/p>\n

\u6211\u4eec\u719f\u6089\u7684ETCD\u6ce8\u518c\u4e2d\u5fc3\u5c31\u91c7\u7528\u4e86\u8fd9\u4e2a\u7b97\u6cd5\uff1b\u4f60\u73b0\u5728\u770b\u7684\u8fd9\u7bc7\u5fae\u4fe1\u516c\u4f17\u53f7\u6587\u7ae0\uff0c\u4e5f\u662f\u4fdd\u5b58\u5728\u57fa\u4e8eRaft\u7b97\u6cd5\u7684\u9ad8\u53ef\u7528\u5b58\u50a8\u670d\u52a1\u5668\u4e2d\u3002<\/p>\n

\u6ca1\u6709\u8010\u5fc3\u770b\u6587\u5b57\uff0c\u5c31\u76f4\u63a5\u62c9\u5230\u7b2c\u56db\u7ae0<\/strong>\u3002<\/p>\n

\u4e00\u3001Raft\u7b97\u6cd5\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n

\u8fc7\u53bb\uff0cPaxos\u4e00\u76f4\u662f\u5206\u5e03\u5f0f\u534f\u8bae\u7684\u6807\u51c6\uff0c\u4f46\u662fPaxos\u96be\u4e8e\u7406\u89e3\uff0c\u66f4\u96be\u4ee5\u5b9e\u73b0\uff0cGoogle\u7684\u5206\u5e03\u5f0f\u9501\u7cfb\u7edfChubby\u4f5c\u4e3aPaxos\u5b9e\u73b0\u66fe\u7ecf\u906d\u9047\u5230\u5f88\u591a\u5751\u3002\u540e\u6765\u65af\u5766\u798f\u5927\u5b66\u63d0\u51fa\u4e86Raft\u7b97\u6cd5\u3002<\/p>\n

Raft\u662f\u7528\u4e8e\u7ba1\u7406\u590d\u5236\u65e5\u5fd7\u7684\u4e00\u81f4\u6027\u7b97\u6cd5\u3002\u5b83\u7684\u6548\u679c\u76f8\u5f53\u4e8e(multi-)Paxos\uff0c\u8ddfPaxos\u4e00\u6837\u9ad8\u6548\uff0c\u4f46\u7ed3\u6784\u4e0ePaxos\u4e0d\u540c\u3002\u8fd9\u4f7f\u5f97Raft\u6bd4Paxos\u66f4\u5bb9\u6613\u7406\u89e3\uff0c\u4e5f\u4e3a\u6784\u5efa\u5b9e\u7528\u7cfb\u7edf\u63d0\u4f9b\u4e86\u66f4\u597d\u7684\u57fa\u7840\u3002<\/p>\n

\u4e0b\u56fe\u662f\u65af\u5766\u798f\u5927\u5b66\u7684Diego Ongaro\u548cJohn Ousterhout\u5728\u300aIn Search of an Understandable Consensus Algorithm\u300b\u4e00\u6587\uff08\u63d0\u51faRaft\u7b97\u6cd5\u7684\u8bba\u6587\uff09\u4e2d\uff0c\u4f9d\u636eRaft\u5b66\u4e60\u96be\u5ea6\u7684\u5b9e\u9a8c\u6570\u636e\u7ed8\u5236\u7684\u3002\u5b9e\u9a8c\u5bf9\u8c61\u662f\u65af\u5766\u798f\u5927\u5b66\u548c\u52a0\u5dde\u5927\u5b66\u4f2f\u514b\u5229\u5206\u6821\u7684\u9ad8\u5e74\u7ea7\u672c\u79d1\u751f\u548c\u7814\u7a76\u751f\u3002\u8fd9\u4e9b\u5929\u624d\u4e5f\u89c9\u5f97Paxos\u5f88\u96be\u3002\u6240\u4ee5\u5bf9\u4e8e\u5927\u591a\u6570\u4eba\u770b\u4e0d\u61c2Paxos\u7b97\u6cd5\u662f\u5f88\u6b63\u5e38\u7684\uff0c\u770b\u4e0d\u61c2Raft\u539f\u7406\u4e5f\u4e0d\u5947\u602a\u3002<\/p>\n

\n
<\/div>\n<\/figure>\n

\u4e8c\u3001\u4ec0\u4e48\u662f\u4e00\u81f4\u6027\uff08Consensus\uff09<\/strong><\/p>\n

\u4e00\u81f4\u6027\u662f\u5206\u5e03\u5f0f\u7cfb\u7edf\u5bb9\u9519\u7684\u57fa\u672c\u95ee\u9898\u3002\u4e00\u81f4\u6027\u6d89\u53ca\u591a\u4e2a\u670d\u52a1\u5668\u72b6\u6001\uff08Values\uff09\u8fbe\u6210\u4e00\u81f4\u3002 \u4e00\u65e6\u4ed6\u4eec\u5c31\u72b6\u6001\u505a\u51fa\u51b3\u5b9a\uff0c\u8be5\u51b3\u5b9a\u5c31\u662f\u6700\u7ec8\u51b3\u5b9a\u3002 \u5f53\u5927\u591a\u6570\u670d\u52a1\u5668\u53ef\u7528\u65f6\uff0c\u5178\u578b\u7684\u4e00\u81f4\u6027\u7b97\u6cd5\u4f1a\u53d6\u5f97\u8fdb\u5c55\u3002\u4f8b\u5982\uff0c\u5373\u4f7f2\u53f0\u670d\u52a1\u5668\u53d1\u751f\u6545\u969c\uff0c5\u53f0\u670d\u52a1\u5668\u7684\u96c6\u7fa4\u4e5f\u53ef\u4ee5\u7ee7\u7eed\u8fd0\u884c\u3002 \u5982\u679c\u66f4\u591a\u670d\u52a1\u5668\u5931\u8d25\uff0c\u5b83\u4eec\u5c06\u505c\u6b62\u8fdb\u5c55\uff08\u4f46\u6c38\u8fdc\u4e0d\u4f1a\u8fd4\u56de\u9519\u8bef\u7684\u7ed3\u679c\uff09\u3002<\/p>\n

\u4e09\u3001Raft\u7b97\u6cd5<\/strong><\/p>\n

\u8bba\u6587Raft\u7b97\u6cd5\u4ecb\u7ecd\u7684\u7ae0\u8282\u5305\u62ec6\u4e2a\u90e8\u5206\uff0c\u4e86\u89e3\u4e2a\u5927\u6982\u5c31\u884c\uff0c\u7136\u540e\u62c9\u5230\u672c\u6587\u540e\u8fb9\uff0c\u6709\u4e2a\u53ef\u64cd\u4f5c\u7684\u6e38\u620f\u8f85\u52a9\u7406\u89e3\u8fd9\u4e2a\u7b97\u6cd5\u3002<\/p>\n

1\u3001Raft\u57fa\u7840\u77e5\u8bc6<\/p>\n

Raft\u96c6\u7fa4\u5305\u542b\u591a\u4e2a\u670d\u52a1\u5668\uff0c5\u4e2a\u670d\u52a1\u5668\u662f\u6bd4\u8f83\u5178\u578b\u7684\uff0c\u5141\u8bb8\u7cfb\u7edf\u5bb9\u5fcd\u4e24\u4e2a\u6545\u969c\u3002\u5728\u4efb\u4f55\u7ed9\u5b9a\u65f6\u95f4\uff0c\u6bcf\u4e2a\u670d\u52a1\u5668\u90fd\u5904\u4e8e\u4ee5\u4e0b\u4e09\u79cd\u72b6\u6001\u4e4b\u4e00\uff0c\u9886\u5bfc\u8005\uff08Leader\uff09\uff0c\u8ffd\u968f\u8005\uff08Follower\uff09\u6216\u5019\u9009\u4eba\uff08Candidate\uff09\u3002 \u8fd9\u51e0\u4e2a\u72b6\u6001\u89c1\u53ef\u4ee5\u76f8\u4e92\u8f6c\u6362\u3002<\/p>\n

Leader\uff1a\u5904\u7406\u6240\u6709\u5ba2\u6237\u7aef\u4ea4\u4e92\uff0c\u65e5\u5fd7\u590d\u5236\u7b49\uff0c\u4e00\u822c\u4e00\u6b21\u53ea\u6709\u4e00\u4e2aLeader<\/p>\n

Follower\uff1a\u7c7b\u4f3c\u9009\u6c11\uff0c\u5b8c\u5168\u88ab\u52a8<\/p>\n

Candidate\uff1a\u7c7b\u4f3cProposer\u5f8b\u5e08\uff0c\u53ef\u4ee5\u88ab\u9009\u4e3a\u4e00\u4e2a\u65b0\u7684\u9886\u5bfc\u4eba<\/p>\n

\n
<\/div>\n<\/figure>\n

2\u3001\u9009\u4e3eLeader<\/p>\n

Raft\u4f7f\u7528\u5fc3\u8df3\u673a\u5236\u6765\u89e6\u53d1\u9886\u5bfc\u8005\u9009\u4e3e\u3002 \u5f53\u670d\u52a1\u5668\u542f\u52a8\u65f6\uff0c\u5b83\u4eec\u4ee5Follower\u7684\u8eab\u4efd\u5f00\u59cb\u3002 \u53ea\u8981\u670d\u52a1\u5668\u4eceLeader\u6216Candidate\u63a5\u6536\u5230\u6709\u6548\u7684RPC\u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u4fdd\u6301Follower\u72b6\u6001\u3002 Leader\u5411\u6240\u6709Follower\u53d1\u9001\u5b9a\u671f\u5fc3\u8df3\uff08\u4e0d\u5e26\u65e5\u5fd7\u6761\u76ee\u7684AppendEntries RPC\uff09\u4ee5\u4fdd\u6301\u5176\u6743\u9650\u3002 \u5982\u679c\u4e00\u4e2aFollower\u5728\u79f0\u4e3a\u9009\u4e3e\u8d85\u65f6\u7684\u4e00\u6bb5\u65f6\u95f4\u5185\u6ca1\u6709\u63a5\u5230\u4efb\u4f55\u901a\u4fe1\uff0c\u8be5Follower\u8ba4\u4e3a\u6ca1\u6709\u53ef\u884c\u7684\u9886\u5bfc\u8005\u5e76\u5f00\u59cb\u9009\u4e3e\u65b0\u7684Leader\u3002<\/p>\n

3\u3001\u65e5\u5fd7\u590d\u5236<\/p>\n

\u4e00\u65e6Leader\u5f53\u9009\uff0c\u5b83\u5c31\u5f00\u59cb\u4e3a\u5ba2\u6237\u8bf7\u6c42\u63d0\u4f9b\u670d\u52a1\u3002\u6bcf\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\u5305\u542b\u7531\u590d\u5236\u72b6\u6001\u673a\u6267\u884c\u7684\u547d\u4ee4\u3002Leader\u5c06\u547d\u4ee4\u4f5c\u4e3a\u65b0\u6761\u76ee\u9644\u52a0\u5230\u5176\u65e5\u5fd7\uff0c\u7136\u540e\u5e76\u884c\u5730\u5411\u6bcf\u4e2a\u5176\u4ed6\u670d\u52a1\u5668\u53d1\u51faAppendEntries RPC\u4ee5\u590d\u5236\u6761\u76ee\u3002\u5f53\u6761\u76ee\u88ab\u5b89\u5168\u5730\u590d\u5236\u65f6\uff0cLeader\u5c06\u6761\u76ee\u5e94\u7528\u4e8e\u5176\u72b6\u6001\u673a\u5e76\u5c06\u8be5\u6267\u884c\u7684\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002\u5982\u679cFollower\u5d29\u6e83\u6216\u8fd0\u884c\u7f13\u6162\uff0c\u6216\u8005\u7f51\u7edc\u6570\u636e\u5305\u4e22\u5931\uff0cLeader\u5c06\u65e0\u9650\u671f\u5730\u91cd\u8bd5AppendEntries RPC\uff08\u5373\u4f7f\u5b83\u5df2\u7ecf\u54cd\u5e94\u5ba2\u6237\u7aef\uff09\uff0c\u76f4\u5230\u6240\u6709Follower\u6700\u7ec8\u5b58\u50a8\u6240\u6709\u65e5\u5fd7\u6761\u76ee\u3002\uff08\u540e\u8fb9\u6e38\u620f\u4e2d\u6709\u4e2arequest\u547d\u4ee4\u83dc\u5355\uff0c\u5c31\u662f\u6a21\u4eff\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\uff09<\/p>\n

\u9664\u4e86\u4ee5\u4e0a3\u70b9\uff0c\u6587\u7ae0\u8fd8\u91cd\u70b9\u63cf\u8ff0\u4e86\u5b89\u5168\u3001Follower\u548cCandidate\u5d29\u6e83\u3001\u65f6\u95f4\u548c\u53ef\u7528\u6027\u4e09\u4e2a\u65b9\u9762\u3002<\/p>\n

\u56db\u3001\u53ef\u89c6\u5316\u7684Raft\u7b97\u6cd5<\/strong><\/p>\n

github\u4e0a\u6709\u4e00\u4e2a\u5e2e\u52a9\u5927\u5bb6\u7406\u89e3\u7b97\u6cd5\u7684\u9875\u9762<\/strong>\uff0c\u5730\u5740\u662fhttps:\/\/raft.github.io\/raftscope\/index.html<\/p>\n

\u5efa\u8bae\u7528\u7535\u8111\u6d4f\u89c8\u5668\u6253\u5f00\uff0c\u5982\u679c\u5728\u624b\u673a\u5fae\u4fe1\u91cc\u6253\u5f00\uff0c\u9700\u8981\u9009\u62e9\u201c\u8bbf\u95ee\u539f\u7f51\u9875\u201d<\/p>\n

\u6211\u622a\u4e86\u4e00\u4e2a\u8fd0\u884c\u72b6\u6001\u7684\u622a\u56fe\uff0c\u5de6\u4fa7\u663e\u793a\u4e94\u53f0\u670d\u52a1\u5668\uff0c\u53f3\u4fa7\u663e\u793a\u65e5\u5fd7\u3002<\/p>\n

\n
<\/div>\n<\/figure>\n

\u5728\u670d\u52a1\u5668\u56fe\u6807\u4e0a\u70b9\u51fb\u9f20\u6807\u53f3\u952e\u4f1a\u51fa\u73b0\u64cd\u4f5c\u83dc\u5355\u3002\u64cd\u4f5c\u83dc\u5355\u5bf9\u5e94\u670d\u52a1\u8282\u70b9\u7684\u72b6\u6001\u6539\u53d8\uff0c\u5176\u4e2drequest\u6a21\u62df\u5ba2\u6237\u7aef\u8bf7\u6c42\u670d\u52a1\u5668\u96c6\u7fa4\u6267\u884c\u4efb\u52a1\uff0c\u4f1a\u5728\u53f3\u8fb9\u4ea7\u751f\u65e5\u5fd7\u3002<\/p>\n

\n
<\/div>\n<\/figure>\n

\u591a\u64cd\u4f5c\u4e00\u4f1a\uff0c\u4e00\u5b9a\u80fd\u591f\u7406\u89e3Raft\u7b97\u6cd5\u662f\u600e\u4e48\u8fd0\u884c\u7684!<\/p>\n

\u4e94\u3001\u603b\u7ed3<\/strong><\/p>\n

Raft\u7b97\u6cd5\u5177\u5907\u5f3a\u4e00\u81f4\u3001\u9ad8\u53ef\u9760\u3001\u9ad8\u53ef\u7528\u7b49\u4f18\u70b9\uff0c\u5177\u4f53\u4f53\u73b0\u5728\uff1a<\/p>\n

\u5f3a\u4e00\u81f4\u6027\uff1a\u867d\u7136\u6240\u6709\u8282\u70b9\u7684\u6570\u636e\u5e76\u975e\u5b9e\u65f6\u4e00\u81f4\uff0c\u4f46Raft\u7b97\u6cd5\u4fdd\u8bc1Leader\u8282\u70b9\u7684\u6570\u636e\u6700\u5168\uff0c\u540c\u65f6\u6240\u6709\u8bf7\u6c42\u90fd\u7531Leader\u5904\u7406\uff0c\u6240\u4ee5\u5728\u5ba2\u6237\u7aef\u89d2\u5ea6\u770b\u662f\u5f3a\u4e00\u81f4\u6027\u7684\u3002<\/p>\n

\u9ad8\u53ef\u9760\u6027\uff1aRaft\u7b97\u6cd5\u4fdd\u8bc1\u4e86Committed\u7684\u65e5\u5fd7\u4e0d\u4f1a\u88ab\u4fee\u6539\uff0cState Matchine\u53ea\u5e94\u7528Committed\u7684\u65e5\u5fd7\uff0c\u6240\u4ee5\u5f53\u5ba2\u6237\u7aef\u6536\u5230\u8bf7\u6c42\u6210\u529f\u5373\u4ee3\u8868\u6570\u636e\u4e0d\u518d\u6539\u53d8\u3002Committed\u65e5\u5fd7\u5728\u5927\u591a\u6570\u8282\u70b9\u4e0a\u5197\u4f59\u5b58\u50a8\uff0c\u5c11\u4e8e\u4e00\u534a\u7684\u78c1\u76d8\u6545\u969c\u6570\u636e\u4e0d\u4f1a\u4e22\u5931\u3002<\/p>\n

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