{"id":4743,"date":"2020-07-26T09:13:44","date_gmt":"2020-07-26T01:13:44","guid":{"rendered":"http:\/\/www.menglanglang.cn\/?p=4743"},"modified":"2020-07-26T09:13:47","modified_gmt":"2020-07-26T01:13:47","slug":"zookeeper%e5%85%a8%e8%a7%a3%e6%9e%90-paxos%e4%bd%9c%e4%b8%ba%e7%81%b5%e9%ad%82","status":"publish","type":"post","link":"http:\/\/www.menglanglang.cn\/?p=4743","title":{"rendered":"Zookeeper\u5168\u89e3\u6790\u2014\u2014Paxos\u4f5c\u4e3a\u7075\u9b42"},"content":{"rendered":"\n<p>\u539f\u8ba1\u5212\u5728\u4ecb\u7ecd\u5b8cZK Client\u4e4b\u540e\u5c31\u7740\u624bZK Server\u7684\u4ecb\u7ecd\uff0c\u4f46\u662f\u53d1\u73b0ZK Server\u6240\u5305\u542b\u7684\u5185\u5bb9\u5b9e\u5728\u592a\u591a\uff0c\u5e76\u4e0d\u662f\u7b80\u7b80\u5355\u5355\u4e00\u7bc7Blog\u5c31\u80fd\u641e\u5b9a\u7684\u3002\u4e8e\u662f\u51b3\u5b9a\u4ece\u57fa\u7840\u641e\u8d77\u6bd4\u8f83\u597d\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48ZK Server\u6700\u57fa\u7840\u7684\u4e1c\u897f\u662f\u4ec0\u4e48\u5462\uff1f\u6211\u60f3\u5e94\u8be5\u662fPaxos\u4e86\u3002\u6240\u4ee5\u672c\u6587\u4f1a\u4ecb\u7ecdPaxos\u4ee5\u53ca\u5b83\u5728ZK Server\u4e2d\u5bf9\u5e94\u7684\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>\u5148\u8bf4Paxos\uff0c\u5b83\u662f\u4e00\u4e2a\u57fa\u4e8e\u6d88\u606f\u4f20\u9012\u7684\u4e00\u81f4\u6027\u7b97\u6cd5\uff0cLeslie Lamport\u57281990\u5e74\u63d0\u51fa\uff0c\u8fd1\u51e0\u5e74\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5206\u5e03\u5f0f\u8ba1\u7b97\u4e2d\uff0cGoogle\u7684Chubby\uff0cApache\u7684Zookeeper\u90fd\u662f\u57fa\u4e8e\u5b83\u7684\u7406\u8bba\u6765\u5b9e\u73b0\u7684\uff0cPaxos\u8fd8\u88ab\u8ba4\u4e3a\u662f\u5230\u76ee\u524d\u4e3a\u6b62\u552f\u4e00\u7684\u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u7b97\u6cd5\uff0c\u5176\u5b83\u7684\u7b97\u6cd5\u90fd\u662fPaxos\u7684\u6539\u8fdb\u6216\u7b80\u5316\u3002\u6709\u4e2a\u95ee\u9898\u8981\u63d0\u4e00\u4e0b\uff0cPaxos\u6709\u4e00\u4e2a\u524d\u63d0\uff1a\u6ca1\u6709\u62dc\u5360\u5ead\u5c06\u519b\u95ee\u9898\u3002\u5c31\u662f\u8bf4Paxos\u53ea\u6709\u5728\u4e00\u4e2a\u53ef\u4fe1\u7684\u8ba1\u7b97\u73af\u5883\u4e2d\u624d\u80fd\u6210\u7acb\uff0c\u8fd9\u4e2a\u73af\u5883\u662f\u4e0d\u4f1a\u88ab\u5165\u4fb5\u6240\u7834\u574f\u7684\u3002<\/p>\n\n\n\n<p>\u5173\u4e8ePaxos\u7684\u5177\u4f53\u63cf\u8ff0\u53ef\u4ee5\u5728Wiki\u4e2d\u627e\u5230\uff1a<a rel=\"noreferrer noopener\" href=\"http:\/\/zh.wikipedia.org\/zh-cn\/Paxos\" target=\"_blank\">http:\/\/zh.wikipedia.org\/zh-cn\/Paxos<\/a>\u7b97\u6cd5\u3002\u7f51\u4e0a\u5173\u4e8ePaxos\u5206\u6790\u7684\u6587\u7ae0\u4e5f\u5f88\u591a\u3002\u8fd9\u91cc\u5e0c\u671b\u7528\u6700\u7b80\u5355\u7684\u65b9\u5f0f\u52a0\u4ee5\u63cf\u8ff0\u5e76\u5efa\u7acb\u8d77Paxos\u548cZK Server\u7684\u5bf9\u5e94\u5173\u7cfb\u3002<\/p>\n\n\n\n<p>Paxos\u63cf\u8ff0\u4e86\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff0c\u6709\u4e00\u4e2a\u53eb\u505aPaxos\u7684\u5c0f\u5c9b(Island)\u4e0a\u9762\u4f4f\u4e86\u4e00\u6279\u5c45\u6c11\uff0c\u5c9b\u4e0a\u9762\u6240\u6709\u7684\u4e8b\u60c5\u7531\u4e00\u4e9b\u7279\u6b8a\u7684\u4eba\u51b3\u5b9a\uff0c\u4ed6\u4eec\u53eb\u505a\u8bae\u5458(Senator)\u3002\u8bae\u5458\u7684\u603b\u6570(Senator 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S2\u60f3\u8bbe\u4e3a2\u5143\/\u5ea6\u3002\u7ed3\u679cS3\u5148\u6536\u5230\u4e86S1\u7684\u63d0\u8bae\uff0c\u4e8e\u662f\u4ed6\u505a\u4e86\u548c\u524d\u9762\u540c\u6837\u7684\u64cd\u4f5c\u3002\u7d27\u63a5\u7740\u4ed6\u53c8\u6536\u5230\u4e86S2\u7684\u63d0\u8bae\uff0c\u7ed3\u679c\u4ed6\u4e00\u67e5\u8bb0\u4e8b\u672c\uff0c\u54a6\uff0c\u8fd9\u4e2a\u63d0\u8bae\u7684\u7f16\u53f7\u5c0f\u4e8e\u7b49\u4e8e\u6211\u7684\u5f53\u524d\u7f16\u53f71\uff0c\u4e8e\u662f\u4ed6\u62d2\u7edd\u4e86\u8fd9\u4e2a\u63d0\u8bae\uff1a\u5bf9\u4e0d\u8d77\uff0c\u8fd9\u4e2a\u63d0\u8bae\u5148\u524d\u63d0\u8fc7\u4e86\u3002\u4e8e\u662fS2\u7684\u63d0\u8bae\u88ab\u62d2\u7edd\uff0cS1\u6b63\u5f0f\u53d1\u5e03\u4e86\u63d0\u8bae: 1\u53f7\u63d0\u8bae\u751f\u6548\u3002S2\u5411S1\u6216\u8005S3\u6253\u542c\u5e76\u66f4\u65b0\u4e861\u53f7\u6cd5\u4ee4\u7684\u5185\u5bb9\uff0c\u7136\u540e\u4ed6\u53ef\u4ee5\u9009\u62e9\u7ee7\u7eed\u53d1\u8d772\u53f7\u63d0\u8bae\u3002<\/p>\n\n\n\n<p>\u597d\uff0c\u6211\u89c9\u5f97Paxos\u7684\u7cbe\u534e\u5c31\u8fd9\u4e48\u591a\u5185\u5bb9\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u5bf9\u53f7\u5165\u5ea7\uff0c\u770b\u770b\u5728ZK Server\u91cc\u9762Paxos\u662f\u5982\u4f55\u5f97\u4ee5\u8d2f\u5f7b\u5b9e\u65bd\u7684\u3002<\/p>\n\n\n\n<p>\u5c0f\u5c9b(Island)\u2014\u2014ZK Server Cluster<\/p>\n\n\n\n<p>\u8bae\u5458(Senator)\u2014\u2014ZK Server<\/p>\n\n\n\n<p>\u63d0\u8bae(Proposal)\u2014\u2014ZNode Change(Create\/Delete\/SetData\u2026)<\/p>\n\n\n\n<p>\u63d0\u8bae\u7f16\u53f7(PID)\u2014\u2014Zxid(ZooKeeper Transaction Id)<\/p>\n\n\n\n<p>\u6b63\u5f0f\u6cd5\u4ee4\u2014\u2014\u6240\u6709ZNode\u53ca\u5176\u6570\u636e<\/p>\n\n\n\n<p>\u8c8c\u4f3c\u5173\u952e\u7684\u6982\u5ff5\u90fd\u80fd\u4e00\u4e00\u5bf9\u5e94\u4e0a\uff0c\u4f46\u662f\u7b49\u4e00\u4e0b\uff0cPaxos\u5c9b\u4e0a\u7684\u8bae\u5458\u5e94\u8be5\u662f\u4eba\u4eba\u5e73\u7b49\u7684\u5427\uff0c\u800cZK Server\u597d\u50cf\u6709\u4e00\u4e2aLeader\u7684\u6982\u5ff5\u3002\u6ca1\u9519\uff0c\u5176\u5b9eLeader\u7684\u6982\u5ff5\u4e5f\u5e94\u8be5\u5c5e\u4e8ePaxos\u8303\u7574\u7684\u3002\u5982\u679c\u8bae\u5458\u4eba\u4eba\u5e73\u7b49\uff0c\u5728\u67d0\u79cd\u60c5\u51b5\u4e0b\u4f1a\u7531\u4e8e\u63d0\u8bae\u7684\u51b2\u7a81\u800c\u4ea7\u751f\u4e00\u4e2a\u201c\u6d3b\u9501\u201d\uff08\u6240\u8c13\u6d3b\u9501\u6211\u7684\u7406\u89e3\u662f\u5927\u5bb6\u90fd\u6ca1\u6709\u6b7b\uff0c\u90fd\u5728\u52a8\uff0c\u4f46\u662f\u4e00\u76f4\u89e3\u51b3\u4e0d\u4e86\u51b2\u7a81\u95ee\u9898\uff09\u3002Paxos\u7684\u4f5c\u8005Lamport\u5728\u4ed6\u7684\u6587\u7ae0\u201dThe Part-Time Parliament\u201c\u4e2d\u9610\u8ff0\u4e86\u8fd9\u4e2a\u95ee\u9898\u5e76\u7ed9\u51fa\u4e86\u89e3\u51b3\u65b9\u6848\u2014\u2014\u5728\u6240\u6709\u8bae\u5458\u4e2d\u8bbe\u7acb\u4e00\u4e2a\u603b\u7edf\uff0c\u53ea\u6709\u603b\u7edf\u6709\u6743\u53d1\u51fa\u63d0\u8bae\uff0c\u5982\u679c\u8bae\u5458\u6709\u81ea\u5df1\u7684\u63d0\u8bae\uff0c\u5fc5\u987b\u53d1\u7ed9\u603b\u7edf\u5e76\u7531\u603b\u7edf\u6765\u63d0\u51fa\u3002\u597d\uff0c\u6211\u4eec\u53c8\u591a\u4e86\u4e00\u4e2a\u89d2\u8272\uff1a\u603b\u7edf\u3002<\/p>\n\n\n\n<p>\u603b\u7edf\u2014\u2014ZK Server Leader<\/p>\n\n\n\n<p>\u53c8\u4e00\u4e2a\u95ee\u9898\u4ea7\u751f\u4e86\uff0c\u603b\u7edf\u600e\u4e48\u9009\u51fa\u6765\u7684\uff1foh, my god! It\u2019s a long story. \u5728\u6dd8\u5b9d\u6838\u5fc3\u7cfb\u7edf\u56e2\u961f\u7684Blog\u4e0a\u9762\u6709\u4e00\u7bc7\u6587\u7ae0\u662f\u4ecb\u7ecd\u5982\u4f55\u9009\u51fa\u603b\u7edf\u7684\uff0c\u6709\u5174\u8da3\u7684\u53ef\u4ee5\u53bb\u770b\u770b\uff1a<a rel=\"noreferrer noopener\" href=\"http:\/\/rdc.taobao.com\/blog\/cs\/?p=162\" target=\"_blank\">http:\/\/rdc.taobao.com\/blog\/cs\/?p=162<\/a><\/p>\n\n\n\n<p>\u73b0\u5728\u6211\u4eec\u5047\u8bbe\u603b\u7edf\u5df2\u7ecf\u9009\u597d\u4e86\uff0c\u4e0b\u9762\u770b\u770bZK Server\u662f\u600e\u4e48\u5b9e\u65bd\u7684\u3002<\/p>\n\n\n\n<p>\u60c5\u51b5\u4e00\uff1a<\/p>\n\n\n\n<p>\u5c41\u6c11\u7532(Client)\u5230\u67d0\u4e2a\u8bae\u5458(ZK Server)\u90a3\u91cc\u8be2\u95ee(Get)\u67d0\u6761\u6cd5\u4ee4\u7684\u60c5\u51b5(ZNode\u7684\u6570\u636e)\uff0c\u8bae\u5458\u6beb\u4e0d\u72b9\u8c6b\u7684\u62ff\u51fa\u4ed6\u7684\u8bb0\u4e8b\u672c(local 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