{"id":817,"date":"2018-07-20T08:33:17","date_gmt":"2018-07-20T00:33:17","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=817"},"modified":"2018-07-20T08:33:17","modified_gmt":"2018-07-20T00:33:17","slug":"%e3%80%90%e5%88%86%e5%b8%83%e5%bc%8f%e3%80%91zookeeper%e7%9a%84%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%a7%92%e8%89%b2","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=817","title":{"rendered":"\u3010\u5206\u5e03\u5f0f\u3011Zookeeper\u7684\u670d\u52a1\u5668\u89d2\u8272"},"content":{"rendered":"<p><strong>\u4e00\u3001\u524d\u8a00<\/strong><\/p>\n<p>\u524d\u4e00\u7bc7\u5df2\u7ecf\u8be6\u7ec6\u7684\u8bb2\u89e3\u4e86Zookeeper\u7684Leader\u9009\u4e3e\u8fc7\u7a0b\uff0c\u4e0b\u9762\u63a5\u7740\u5b66\u4e60Zookeeper\u4e2d\u670d\u52a1\u5668\u7684\u5404\u4e2a\u89d2\u8272\u53ca\u5176\u7ec6\u8282\u3002<\/p>\n<p><strong>\u4e8c\u3001\u670d\u52a1\u5668\u89d2\u8272<\/strong><\/p>\n<p>2.1 Leader<\/p>\n<p>Leader\u670d\u52a1\u5668\u662fZookeeper\u96c6\u7fa4\u5de5\u4f5c\u7684\u6838\u5fc3\uff0c\u5176\u4e3b\u8981\u5de5\u4f5c\u5982\u4e0b<\/p>\n<p>(1) \u4e8b\u52a1\u8bf7\u6c42\u7684\u552f\u4e00\u8c03\u5ea6\u548c\u5904\u7406\u8005\uff0c\u4fdd\u8bc1\u96c6\u7fa4\u4e8b\u52a1\u5904\u7406\u7684\u987a\u5e8f\u6027\u3002<\/p>\n<p>(2) \u96c6\u7fa4\u5185\u90e8\u5404\u670d\u52a1\u5668\u7684\u8c03\u5ea6\u8005\u3002<\/p>\n<p>1. \u8bf7\u6c42\u5904\u7406\u94fe<\/p>\n<p>\u4f7f\u7528\u8d23\u4efb\u94fe\u6765\u5904\u7406\u6bcf\u4e2a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u65f6Zookeeper\u7684\u7279\u8272\uff0cLeader\u670d\u52a1\u5668\u7684\u8bf7\u6c42\u5904\u7406\u94fe\u5982\u4e0b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/images2015.cnblogs.com\/blog\/616953\/201612\/616953-20161206203032319-1806823400.png\" alt=\"\" \/><\/p>\n<p>(1) PrepRequestProcessor\u3002\u8bf7\u6c42\u9884\u5904\u7406\u5668\u3002\u5728Zookeeper\u4e2d\uff0c\u90a3\u4e9b\u4f1a\u6539\u53d8\u670d\u52a1\u5668\u72b6\u6001\u7684\u8bf7\u6c42\u79f0\u4e3a\u4e8b\u52a1\u8bf7\u6c42\uff08\u521b\u5efa\u8282\u70b9\u3001\u66f4\u65b0\u6570\u636e\u3001\u5220\u9664\u8282\u70b9\u3001\u521b\u5efa\u4f1a\u8bdd\u7b49\uff09\uff0cPrepRequestProcessor\u80fd\u591f\u8bc6\u522b\u51fa\u5f53\u524d\u5ba2\u6237\u7aef\u8bf7\u6c42\u662f\u5426\u662f\u4e8b\u52a1\u8bf7\u6c42\u3002\u5bf9\u4e8e\u4e8b\u52a1\u8bf7\u6c42\uff0cPrepRequestProcessor\u5904\u7406\u5668\u4f1a\u5bf9\u5176\u8fdb\u884c\u4e00\u7cfb\u5217\u9884\u5904\u7406\uff0c\u5982\u521b\u5efa\u8bf7\u6c42\u4e8b\u52a1\u5934\u3001\u4e8b\u52a1\u4f53\u3001\u4f1a\u8bdd\u68c0\u67e5\u3001ACL\u68c0\u67e5\u548c\u7248\u672c\u68c0\u67e5\u7b49\u3002<\/p>\n<p>(2) ProposalRequestProcessor\u3002\u4e8b\u52a1\u6295\u7968\u5904\u7406\u5668\u3002Leader\u670d\u52a1\u5668\u4e8b\u52a1\u5904\u7406\u6d41\u7a0b\u7684\u53d1\u8d77\u8005\uff0c\u5bf9\u4e8e\u975e\u4e8b\u52a1\u6027\u8bf7\u6c42\uff0cProposalRequestProcessor\u4f1a\u76f4\u63a5\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230CommitProcessor\u5904\u7406\u5668\uff0c\u4e0d\u518d\u505a\u4efb\u4f55\u5904\u7406\uff0c\u800c\u5bf9\u4e8e\u4e8b\u52a1\u6027\u8bf7\u6c42\uff0c\u5904\u7406\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230CommitProcessor\u5916\uff0c\u8fd8\u4f1a\u6839\u636e\u8bf7\u6c42\u7c7b\u578b\u521b\u5efa\u5bf9\u5e94\u7684Proposal\u63d0\u8bae\uff0c\u5e76\u53d1\u9001\u7ed9\u6240\u6709\u7684Follower\u670d\u52a1\u5668\u6765\u53d1\u8d77\u4e00\u6b21\u96c6\u7fa4\u5185\u7684\u4e8b\u52a1\u6295\u7968\u3002\u540c\u65f6\uff0cProposalRequestProcessor\u8fd8\u4f1a\u5c06\u4e8b\u52a1\u8bf7\u6c42\u4ea4\u4ed8\u7ed9SyncRequestProcessor\u8fdb\u884c\u4e8b\u52a1\u65e5\u5fd7\u7684\u8bb0\u5f55\u3002<\/p>\n<p>(2) SyncRequestProcessor\u3002\u4e8b\u52a1\u65e5\u5fd7\u8bb0\u5f55\u5904\u7406\u5668\u3002\u7528\u6765\u5c06\u4e8b\u52a1\u8bf7\u6c42\u8bb0\u5f55\u5230\u4e8b\u52a1\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff0c\u540c\u65f6\u4f1a\u89e6\u53d1Zookeeper\u8fdb\u884c\u6570\u636e\u5feb\u7167\u3002<\/p>\n<p>(3) AckRequestProcessor\u3002\u8d1f\u8d23\u5728SyncRequestProcessor\u5b8c\u6210\u4e8b\u52a1\u65e5\u5fd7\u8bb0\u5f55\u540e\uff0c\u5411Proposal\u7684\u6295\u7968\u6536\u96c6\u5668\u53d1\u9001ACK\u53cd\u9988\uff0c\u4ee5\u901a\u77e5\u6295\u7968\u6536\u96c6\u5668\u5f53\u524d\u670d\u52a1\u5668\u5df2\u7ecf\u5b8c\u6210\u4e86\u5bf9\u8be5Proposal\u7684\u4e8b\u52a1\u65e5\u5fd7\u8bb0\u5f55\u3002<\/p>\n<p>(4) CommitProcessor\u3002\u4e8b\u52a1\u63d0\u4ea4\u5904\u7406\u5668\u3002\u5bf9\u4e8e\u975e\u4e8b\u52a1\u8bf7\u6c42\uff0c\u8be5\u5904\u7406\u5668\u4f1a\u76f4\u63a5\u5c06\u5176\u4ea4\u4ed8\u7ed9\u4e0b\u4e00\u7ea7\u5904\u7406\u5668\u5904\u7406\uff1b\u5bf9\u4e8e\u4e8b\u52a1\u8bf7\u6c42\uff0c\u5176\u4f1a\u7b49\u5f85\u96c6\u7fa4\u5185\u9488\u5bf9Proposal\u7684\u6295\u7968\u76f4\u5230\u8be5Proposal\u53ef\u88ab\u63d0\u4ea4\uff0c\u5229\u7528CommitProcessor\uff0c\u6bcf\u4e2a\u670d\u52a1\u5668\u90fd\u53ef\u4ee5\u5f88\u597d\u5730\u63a7\u5236\u5bf9\u4e8b\u52a1\u8bf7\u6c42\u7684\u987a\u5e8f\u5904\u7406\u3002<\/p>\n<p>(5) ToBeCommitProcessor\u3002\u8be5\u5904\u7406\u5668\u6709\u4e00\u4e2atoBeApplied\u961f\u5217\uff0c\u7528\u6765\u5b58\u50a8\u90a3\u4e9b\u5df2\u7ecf\u88abCommitProcessor\u5904\u7406\u8fc7\u7684\u53ef\u88ab\u63d0\u4ea4\u7684Proposal\u3002\u5176\u4f1a\u5c06\u8fd9\u4e9b\u8bf7\u6c42\u4ea4\u4ed8\u7ed9FinalRequestProcessor\u5904\u7406\u5668\u5904\u7406\uff0c\u5f85\u5176\u5904\u7406\u5b8c\u540e\uff0c\u518d\u5c06\u5176\u4ecetoBeApplied\u961f\u5217\u4e2d\u79fb\u9664\u3002<\/p>\n<p>(6) FinalRequestProcessor\u3002\u7528\u6765\u8fdb\u884c\u5ba2\u6237\u7aef\u8bf7\u6c42\u8fd4\u56de\u4e4b\u524d\u7684\u64cd\u4f5c\uff0c\u5305\u62ec\u521b\u5efa\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u54cd\u5e94\uff0c\u9488\u5bf9\u4e8b\u52a1\u8bf7\u6c42\uff0c\u8be5\u5904\u7406\u8fd8\u4f1a\u8d1f\u8d23\u5c06\u4e8b\u52a1\u5e94\u7528\u5230\u5185\u5b58\u6570\u636e\u5e93\u4e2d\u53bb\u3002<\/p>\n<p>2. LearnerHandler<\/p>\n<p>\u4e3a\u4e86\u4fdd\u8bc1\u6574\u4e2a\u96c6\u7fa4\u5185\u90e8\u7684\u5b9e\u65f6\u901a\u4fe1\uff0c\u540c\u65f6\u4e3a\u4e86\u786e\u4fdd\u53ef\u4ee5\u63a7\u5236\u6240\u6709\u7684Follower\/Observer\u670d\u52a1\u5668\uff0cLeader\u670d\u52a1\u5668\u4f1a\u4e0e\u6bcf\u4e2aFollower\/Observer\u670d\u52a1\u5668\u5efa\u7acb\u4e00\u4e2aTCP\u957f\u8fde\u63a5\u3002\u540c\u65f6\u4e5f\u4f1a\u4e3a\u6bcf\u4e2aFollower\/Observer\u670d\u52a1\u5668\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aLearnerHandler\u7684\u5b9e\u4f53\u3002LearnerHandler\u662fLearner\u670d\u52a1\u5668\u7684\u7ba1\u7406\u8005\uff0c\u4e3b\u8981\u8d1f\u8d23Follower\/Observer\u670d\u52a1\u5668\u548cLeader\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u4e00\u7cfb\u5217\u7f51\u7edc\u901a\u4fe1\uff0c\u5305\u62ec\u6570\u636e\u540c\u6b65\u3001\u8bf7\u6c42\u8f6c\u53d1\u548cProposal\u63d0\u8bae\u7684\u6295\u7968\u7b49\u3002Leader\u670d\u52a1\u5668\u4e2d\u4fdd\u5b58\u4e86\u6240\u6709Follower\/Observer\u5bf9\u5e94\u7684LearnerHandler\u3002<\/p>\n<p>2.2 Follower<\/p>\n<p>Follower\u662fZookeeper\u96c6\u7fa4\u7684\u8ddf\u968f\u8005\uff0c\u5176\u4e3b\u8981\u5de5\u4f5c\u5982\u4e0b<\/p>\n<p>(1) \u5904\u7406\u5ba2\u6237\u7aef\u975e\u4e8b\u52a1\u6027\u8bf7\u6c42\uff08\u8bfb\u53d6\u6570\u636e\uff09\uff0c\u8f6c\u53d1\u4e8b\u52a1\u8bf7\u6c42\u7ed9Leader\u670d\u52a1\u5668\u3002<\/p>\n<p>(2) \u53c2\u4e0e\u4e8b\u52a1\u8bf7\u6c42Proposal\u7684\u6295\u7968\u3002<\/p>\n<p>(3) \u53c2\u4e0eLeader\u9009\u4e3e\u6295\u7968\u3002<\/p>\n<p>Follower\u4e5f\u91c7\u7528\u4e86\u8d23\u4efb\u94fe\u6a21\u5f0f\u7ec4\u88c5\u7684\u8bf7\u6c42\u5904\u7406\u94fe\u6765\u5904\u7406\u6bcf\u4e00\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u7531\u4e8e\u4e0d\u9700\u8981\u5bf9\u4e8b\u52a1\u8bf7\u6c42\u7684\u6295\u7968\u5904\u7406\uff0c\u56e0\u6b64Follower\u7684\u8bf7\u6c42\u5904\u7406\u94fe\u4f1a\u76f8\u5bf9\u7b80\u5355\uff0c\u5176\u5904\u7406\u94fe\u5982\u4e0b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/images2015.cnblogs.com\/blog\/616953\/201612\/616953-20161206205916319-94850171.png\" alt=\"\" \/><\/p>\n<p>(1) FollowerRequestProcessor\u3002\u5176\u7528\u4f5c\u8bc6\u522b\u5f53\u524d\u8bf7\u6c42\u662f\u5426\u662f\u4e8b\u52a1\u8bf7\u6c42\uff0c\u82e5\u662f\uff0c\u90a3\u4e48Follower\u5c31\u4f1a\u5c06\u8be5\u8bf7\u6c42\u8f6c\u53d1\u7ed9Leader\u670d\u52a1\u5668\uff0cLeader\u670d\u52a1\u5668\u662f\u5728\u63a5\u6536\u5230\u8fd9\u4e2a\u4e8b\u52a1\u8bf7\u6c42\u540e\uff0c\u5c31\u4f1a\u5c06\u5176\u63d0\u4ea4\u5230\u8bf7\u6c42\u5904\u7406\u94fe\uff0c\u6309\u7167\u6b63\u5e38\u4e8b\u52a1\u8bf7\u6c42\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>(2) SendAckRequestProcessor\u3002\u5176\u627f\u62c5\u4e86\u4e8b\u52a1\u65e5\u5fd7\u8bb0\u5f55\u53cd\u9988\u7684\u89d2\u8272\uff0c\u5728\u5b8c\u6210\u4e8b\u52a1\u65e5\u5fd7\u8bb0\u5f55\u540e\uff0c\u4f1a\u5411Leader\u670d\u52a1\u5668\u53d1\u9001ACK\u6d88\u606f\u4ee5\u8868\u660e\u81ea\u8eab\u5b8c\u6210\u4e86\u4e8b\u52a1\u65e5\u5fd7\u7684\u8bb0\u5f55\u5de5\u4f5c\u3002<\/p>\n<p>2.3 Observer<\/p>\n<p>Observer\u5145\u5f53\u89c2\u5bdf\u8005\u89d2\u8272\uff0c\u89c2\u5bdfZookeeper\u96c6\u7fa4\u7684\u6700\u65b0\u72b6\u6001\u53d8\u5316\u5e76\u5c06\u8fd9\u4e9b\u72b6\u6001\u540c\u6b65\u8fc7\u6765\uff0c\u5176\u5bf9\u4e8e\u975e\u4e8b\u52a1\u8bf7\u6c42\u53ef\u4ee5\u8fdb\u884c\u72ec\u7acb\u5904\u7406\uff0c\u5bf9\u4e8e\u4e8b\u52a1\u8bf7\u6c42\uff0c\u5219\u4f1a\u8f6c\u53d1\u7ed9Leader\u670d\u52a1\u5668\u8fdb\u884c\u5904\u7406\u3002Observer\u4e0d\u4f1a\u53c2\u4e0e\u4efb\u4f55\u5f62\u5f0f\u7684\u6295\u7968\uff0c\u5305\u62ec\u4e8b\u52a1\u8bf7\u6c42Proposal\u7684\u6295\u7968\u548cLeader\u9009\u4e3e\u6295\u7968\u3002\u5176\u5904\u7406\u94fe\u5982\u4e0b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/images2015.cnblogs.com\/blog\/616953\/201612\/616953-20161206210521179-2100336705.png\" alt=\"\" \/><\/p>\n<p>2.4 \u96c6\u7fa4\u95f4\u6d88\u606f\u901a\u4fe1<\/p>\n<p>Zookeeper\u7684\u6d88\u606f\u7c7b\u578b\u5927\u4f53\u5206\u4e3a\u6570\u636e\u540c\u6b65\u578b\u3001\u670d\u52a1\u5668\u521d\u59cb\u5316\u578b\u3001\u8bf7\u6c42\u5904\u7406\u578b\u548c\u4f1a\u8bdd\u7ba1\u7406\u578b\u3002<\/p>\n<p>(1)\u00a0<strong>\u6570\u636e\u540c\u6b65\u578b<\/strong>\u3002\u6307\u5728Learner\u548cLeader\u670d\u52a1\u5668\u8fdb\u884c\u6570\u636e\u540c\u6b65\u65f6\uff0c\u7f51\u7edc\u901a\u4fe1\u6240\u7528\u5230\u7684\u6d88\u606f\uff0c\u901a\u5e38\u6709DIFF\u3001TRUNC\u3001SNAP\u3001UPTODATE\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/images2015.cnblogs.com\/blog\/616953\/201612\/616953-20161206211659288-380771789.png\" alt=\"\" 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src=\"https:\/\/images2015.cnblogs.com\/blog\/616953\/201612\/616953-20161206214318897-1132940651.png\" alt=\"\" \/><\/p>\n<p>(4)\u00a0<strong>\u4f1a\u8bdd\u7ba1\u7406\u578b<\/strong>\u3002\u6307Zookeeper\u5728\u8fdb\u884c\u4f1a\u8bdd\u7ba1\u7406\u65f6\u548cLearner\u670d\u52a1\u5668\u4e4b\u95f4\u4e92\u76f8\u901a\u4fe1\u6240\u4f7f\u7528\u7684\u6d88\u606f\uff0c\u5e38\u89c1\u7684\u6709PING\u548cREVALIDATE\u4e24\u79cd\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/images2015.cnblogs.com\/blog\/616953\/201612\/616953-20161206215016601-1432875769.png\" alt=\"\" \/><\/p>\n<p><strong>\u4e09\u3001\u603b\u7ed3<\/strong><\/p>\n<p>\u7ecf\u8fc7\u672c\u7bc7\u535a\u6587\u7684\u8bb2\u89e3\uff0c\u660e\u767d\u4e86\u670d\u52a1\u5668\u7684\u5404\u79cd\u89d2\u8272\u53ca\u5176\u4f5c\u7528\uff0c\u4ee5\u53ca\u96c6\u7fa4\u95f4\u5982\u4f55\u8fdb\u884c\u901a\u4fe1\u3002\u8c22\u8c22\u5404\u4f4d\u56ed\u53cb\u7684\u89c2\u770b~<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u524d\u8a00 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