{"id":4509,"date":"2019-10-06T18:58:53","date_gmt":"2019-10-06T10:58:53","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=4509"},"modified":"2019-10-06T18:58:53","modified_gmt":"2019-10-06T10:58:53","slug":"zookeeper%e5%b8%b8%e8%a7%81%e7%9a%84%e9%9d%a2%e8%af%95%e9%a2%98%e5%92%8c%e6%a0%b8%e5%bf%83%e7%9f%a5%e8%af%86%e7%82%b9%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4509","title":{"rendered":"Zookeeper\u5e38\u89c1\u7684\u9762\u8bd5\u9898\u548c\u6838\u5fc3\u77e5\u8bc6\u70b9\u603b\u7ed3"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Zookeeper \u662f\u73b0\u4ee3\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u91cd\u8981\u7684\u4e00\u73af\uff0c\u4f7f\u7528\u5b83\u7684\u516c\u53f8\u4f17\u591a\u3002\u6240\u4ee5\uff0c\u4e0d\u7ba1\u5728\u9762\u8bd5\u4e2d\u8fd8\u662f\u5e73\u65f6\u7684\u9879\u76ee\u5b9e\u6218\uff0c\u90fd\u8981\u5bf9 Zookeeper \u505a\u5230\u6df1\u5165\u7406\u89e3\u3002\u4eca\u5929\uff0c\u62bd\u7a7a\u603b\u7ed3\u4e86\u4e00\u4e9b ZK \u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\uff0c\u65b9\u4fbf\u540e\u9762\u590d\u4e60\u3002<\/p>\n\n\n\n<h2>Zookeeper\u662f\u4ec0\u4e48<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zookeeper \u5206\u5e03\u5f0f\u670d\u52a1\u6846\u67b6\u662fApache Hadoop \u7684\u4e00\u4e2a\u5b50\u9879\u76ee\uff0c\u5b83\u4e3b\u8981\u662f\u7528\u6765\u89e3\u51b3\u5206\u5e03\u5f0f\u5e94\u7528\u4e2d\u7ecf\u5e38\u9047\u5230\u7684\u4e00\u4e9b\u6570\u636e\u7ba1\u7406\u95ee\u9898\uff0c\u5982\uff1a\u7edf\u4e00\u547d\u540d\u670d\u52a1\u3001\u72b6\u6001\u540c\u6b65\u670d\u52a1\u3001\u96c6\u7fa4\u7ba1\u7406\u3001\u5206\u5e03\u5f0f\u5e94\u7528\u914d\u7f6e\u9879\u7684\u7ba1\u7406\u7b49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zookeeper&nbsp;\u4f5c\u4e3a\u4e00\u4e2a\u5206\u5e03\u5f0f\u7684\u670d\u52a1\u6846\u67b6\uff0c\u4e3b\u8981\u7528\u6765\u89e3\u51b3\u5206\u5e03\u5f0f\u96c6\u7fa4\u4e2d\u5e94\u7528\u7cfb\u7edf\u7684\u4e00\u81f4\u6027\u95ee\u9898\uff0c\u5b83\u80fd\u63d0\u4f9b\u57fa\u4e8e\u7c7b\u4f3c\u4e8e\u6587\u4ef6\u7cfb\u7edf\u7684\u76ee\u5f55\u8282\u70b9\u6811\u65b9\u5f0f\u7684\u6570\u636e\u5b58\u50a8\uff0c&nbsp;Zookeeper&nbsp;\u4f5c\u7528\u4e3b\u8981\u662f\u7528\u6765\u7ef4\u62a4\u548c\u76d1\u63a7\u5b58\u50a8\u7684\u6570\u636e\u7684\u72b6\u6001\u53d8\u5316\uff0c\u901a\u8fc7\u76d1\u63a7\u8fd9\u4e9b\u6570\u636e\u72b6\u6001\u7684\u53d8\u5316\uff0c\u4ece\u800c\u8fbe\u5230\u57fa\u4e8e\u6570\u636e\u7684\u96c6\u7fa4\u7ba1\u7406<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5355\u7684\u8bf4\uff0czookeeper=\u6587\u4ef6\u7cfb\u7edf+\u901a\u77e5\u673a\u5236\u3002<\/p>\n\n\n\n<h2>Zookeeer\u5de5\u4f5c\u539f\u7406<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ZooKeeper\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7684\uff0c\u5f00\u653e\u6e90\u7801\u7684\u5206\u5e03\u5f0f\u5e94\u7528\u7a0b\u5e8f\u534f\u8c03\u670d\u52a1\uff0c\u5b83\u5305\u542b\u4e00\u4e2a\u7b80\u5355\u7684\u539f\u8bed\u96c6\uff0c\u5206\u5e03\u5f0f\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u57fa\u4e8e\u5b83\u5b9e\u73b0\u540c\u6b65\u670d\u52a1\uff0c\u914d\u7f6e\u7ef4\u62a4\u548c \u547d\u540d\u670d\u52a1\u7b49\u3002Zookeeper\u662fhadoop\u7684\u4e00\u4e2a\u5b50\u9879\u76ee\uff0c\u5176\u53d1\u5c55\u5386\u7a0b\u65e0\u9700\u8d58\u8ff0\u3002\u5728\u5206\u5e03\u5f0f\u5e94\u7528\u4e2d\uff0c\u7531\u4e8e\u5de5\u7a0b\u5e08\u4e0d\u80fd\u5f88\u597d\u5730\u4f7f\u7528\u9501\u673a\u5236\uff0c\u4ee5\u53ca\u57fa\u4e8e\u6d88\u606f\u7684\u534f\u8c03 \u673a\u5236\u4e0d\u9002\u5408\u5728\u67d0\u4e9b\u5e94\u7528\u4e2d\u4f7f\u7528\uff0c\u56e0\u6b64\u9700\u8981\u6709\u4e00\u79cd\u53ef\u9760\u7684\u3001\u53ef\u6269\u5c55\u7684\u3001\u5206\u5e03\u5f0f\u7684\u3001\u53ef\u914d\u7f6e\u7684\u534f\u8c03\u673a\u5236\u6765\u7edf\u4e00\u7cfb\u7edf\u7684\u72b6\u6001<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zookeeper\u4e2d\u7684\u5143\u7d20\u4ecb\u7ecd<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/img-blog.csdn.net\/20170103113503084\" alt=\"\" \/><figcaption>ZK \u4e2d\u7684\u5404\u4e2a\u8282\u70b9<\/figcaption><\/figure><\/div>\n\n\n\n<h2>znode\u8282\u70b9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u56db\u79cd\u7c7b\u578b\u7684znode\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>PERSISTENT-\u6301\u4e45\u5316\u76ee\u5f55\u8282\u70b9\u3002\u5ba2\u6237\u7aef\u4e0ezookeeper\u65ad\u5f00\u8fde\u63a5\u540e\uff0c\u8be5\u8282\u70b9\u4f9d\u65e7\u5b58\u5728<\/li><li>PERSISTENT_SEQUENTIAL-\u6301\u4e45\u5316\u987a\u5e8f\u7f16\u53f7\u76ee\u5f55\u8282\u70b9\u3002\u5ba2\u6237\u7aef\u4e0ezookeeper\u65ad\u5f00\u8fde\u63a5\u540e\uff0c\u8be5\u8282\u70b9\u4f9d\u65e7\u5b58\u5728\uff0c\u53ea\u662fZookeeper\u7ed9\u8be5\u8282\u70b9\u540d\u79f0\u8fdb\u884c\u987a\u5e8f\u7f16\u53f7<\/li><li>EPHEMERAL-\u4e34\u65f6\u76ee\u5f55\u8282\u70b9\u3002\u5ba2\u6237\u7aef\u4e0ezookeeper\u65ad\u5f00\u8fde\u63a5\u540e\uff0c\u8be5\u8282\u70b9\u88ab\u5220\u9664<\/li><li> EPHEMERAL_SEQUENTIAL-\u4e34\u65f6\u987a\u5e8f\u7f16\u53f7\u76ee\u5f55\u8282\u70b9\u3002\u5ba2\u6237\u7aef\u4e0ezookeeper\u65ad\u5f00\u8fde\u63a5\u540e\uff0c\u8be5\u8282\u70b9\u88ab\u5220\u9664\uff0c\u53ea\u662fZookeeper\u7ed9\u8be5\u8282\u70b9\u540d\u79f0\u8fdb\u884c\u987a\u5e8f\u7f16\u53f7<\/li><\/ol>\n\n\n\n<h2>NameService \u547d\u540d\u670d\u52a1<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u4f3c\u4e4e\u6700\u7b80\u5355\uff0c\u5728zookeeper\u7684\u6587\u4ef6\u7cfb\u7edf\u91cc\u521b\u5efa\u4e00\u4e2a\u76ee\u5f55\uff0c\u5373\u6709\u552f\u4e00\u7684path\u3002\u5728\u6211\u4eec\u4f7f\u7528tborg\u65e0\u6cd5\u786e\u5b9a\u4e0a\u6e38\u7a0b\u5e8f\u7684\u90e8\u7f72\u673a\u5668\u65f6\u5373\u53ef\u4e0e\u4e0b\u6e38\u7a0b\u5e8f\u7ea6\u5b9a\u597dpath\uff0c\u901a\u8fc7path\u5373\u80fd\u4e92\u76f8\u63a2\u7d22\u53d1\u73b0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3b\u8981\u662f\u4f5c\u4e3a\u5206\u5e03\u5f0f\u547d\u540d\u670d\u52a1\uff0c\u901a\u8fc7\u8c03\u7528zk\u7684create node api\uff0c\u80fd\u591f\u5f88\u5bb9\u6613\u521b\u5efa\u4e00\u4e2a\u5168\u5c40\u552f\u4e00\u7684path\uff0c\u8fd9\u4e2apath\u5c31\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u540d\u79f0\u3002<\/p>\n\n\n\n<h2>configuration \u914d\u7f6e\u7ba1\u7406<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u628a\u8fd9\u4e9b\u914d\u7f6e\u5168\u90e8\u653e\u5230zookeeper\u4e0a\u53bb\uff0c\u4fdd\u5b58\u5728 Zookeeper \u7684\u67d0\u4e2a\u76ee\u5f55\u8282\u70b9\u4e2d\uff0c\u7136\u540e\u6240\u6709\u76f8\u5173\u5e94\u7528\u7a0b\u5e8f\u5bf9\u8fd9\u4e2a\u76ee\u5f55\u8282\u70b9\u8fdb\u884c\u76d1\u542c\uff0c\u4e00\u65e6\u914d\u7f6e\u4fe1\u606f\u53d1\u751f\u53d8\u5316\uff0c\u6bcf\u4e2a\u5e94\u7528\u7a0b\u5e8f\u5c31\u4f1a\u6536\u5230 Zookeeper \u7684\u901a\u77e5\uff0c\u7136\u540e\u4ece Zookeeper \u83b7\u53d6\u65b0\u7684\u914d\u7f6e\u4fe1\u606f\u5e94\u7528\u5230\u7cfb\u7edf\u4e2d\u5c31\u597d\u3002<\/p>\n\n\n\n<h2>GroupMembers \u96c6\u7fa4\u7ba1\u7406<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u8c13\u96c6\u7fa4\u7ba1\u7406\u65e0\u5728\u4e4e\u4e24\u70b9\uff1a\u662f\u5426\u6709\u673a\u5668\u9000\u51fa\u548c\u52a0\u5165\u3001\u9009\u4e3emaster\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u7b2c\u4e00\u70b9\uff0c\u6240\u6709\u673a\u5668\u7ea6\u5b9a\u5728\u7236\u76ee\u5f55GroupMembers\u4e0b\u521b\u5efa\u4e34\u65f6\u76ee\u5f55\u8282\u70b9\uff0c\u7136\u540e\u76d1\u542c\u7236\u76ee\u5f55\u8282\u70b9\u7684\u5b50\u8282\u70b9\u53d8\u5316\u6d88\u606f\u3002\u4e00\u65e6\u6709\u673a\u5668\u6302\u6389\uff0c\u8be5\u673a\u5668\u4e0e zookeeper\u7684\u8fde\u63a5\u65ad\u5f00\uff0c\u5176\u6240\u521b\u5efa\u7684\u4e34\u65f6\u76ee\u5f55\u8282\u70b9\u88ab\u5220\u9664\uff0c\u6240\u6709\u5176\u4ed6\u673a\u5668\u90fd\u6536\u5230\u901a\u77e5\uff1a\u67d0\u4e2a\u5144\u5f1f\u76ee\u5f55\u88ab\u5220\u9664\uff0c\u4e8e\u662f\uff0c\u6240\u6709\u4eba\u90fd\u77e5\u9053\u4e86\u3002\u65b0\u673a\u5668\u52a0\u5165\u4e5f\u662f\u7c7b\u4f3c\uff0c\u6240\u6709\u673a\u5668\u6536\u5230\u901a\u77e5\uff1a\u65b0\u5144\u5f1f\u76ee\u5f55\u52a0\u5165\uff0chighcount\u53c8\u6709\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u7b2c\u4e8c\u70b9\uff0c\u6240\u6709\u673a\u5668\u521b\u5efa\u4e34\u65f6\u987a\u5e8f\u7f16\u53f7\u76ee\u5f55\u8282\u70b9\uff0c\u901a\u8fc7master\u9009\u4e3e\u7b97\u6cd5\u9009\u4e3e\u51fa\u6765\u3002<\/p>\n\n\n\n<h2>Zookeeper\u4e2d\u7684\u89d2\u8272\u4ecb\u7ecd<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>client\uff1a\u5206\u5e03\u5f0f\u4e2d\u7684\u4e00\u4e2a\u8282\u70b9\uff0c\u8bbf\u95ee\u670d\u52a1\u5668\u7684\u914d\u7f6e\u4fe1\u606f\uff0c\u5468\u671f\u6027\u5411server\u53d1\u9001\u5fc3\u8df3\u5305\uff0cserver\u5411client\u56de\u5e94\u786e\u8ba4\uff0c\u5982\u679cclient\u6ca1\u6709\u6536\u5230\u56de\u5e94\uff0c\u5219\u91cd\u5b9a\u5411\u5230\u53e6\u4e00\u4e2aserver<\/li><li>server\uff1azookeeper\u4e2d\u7684\u4e00\u4e2a\u8282\u70b9\uff0c\u4e3aclient\u63d0\u4f9b\u6240\u9700\u7684\u670d\u52a1\uff0c\u7ed9client\u56de\u5e94\u4fe1\u606f\u8868\u660e\u81ea\u5df1\u662f\u5b58\u6d3b\u7684<\/li><li>leader\uff1a\u8fde\u63a5\u4efb\u4f55\u4e00\u4e2a\u8282\u70b9\uff0c\u5982\u679c\u8282\u70b9\u51fa\u73b0\u6545\u969c\uff0cleader\u81ea\u52a8\u4fee\u590d\uff0c\u5728service\u542f\u52a8\u65f6\u5b8c\u6210leader\u7684\u9009\u4e3e<\/li><li>follower\uff1a<\/li><li>\u542c\u4eceleader\u7684\u6307\u4ee4\uff0c\u5b8c\u6210\u9009\u4e3e\u5de5\u4f5c<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Leader \u4e3b\u8981\u6709\u4e09\u4e2a\u529f\u80fd\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u6062\u590d\u6570\u636e\uff1b<\/li><li>\u7ef4\u6301\u4e0efollower\u7684\u5fc3\u8df3\uff0c\u63a5\u6536follower\u8bf7\u6c42\u5e76\u5224\u65adfollower\u7684\u8bf7\u6c42\u6d88\u606f\u7c7b\u578b\uff1b<\/li><li>follower\u7684\u6d88\u606f\u7c7b\u578b\u4e3b\u8981\u6709PING\u6d88\u606f\u3001REQUEST\u6d88\u606f\u3001ACK\u6d88\u606f\u3001REVALIDATE\u6d88\u606f\uff0c\u6839\u636e\u4e0d\u540c\u7684\u6d88\u606f\u7c7b\u578b\uff0c\u8fdb\u884c\u4e0d\u540c\u7684\u5904\u7406\u3002<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/img-blog.csdn.net\/20170103124350319\" alt=\"\" \/><figcaption>Zookeeper \u4e2d\u7684\u5404\u79cd Server<\/figcaption><\/figure><\/div>\n\n\n\n<h2>\u9009\u4e3e\u6d41\u7a0b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53leader\u5d29\u6e83\u6216\u8005leader\u5931\u53bb\u5927\u591a\u6570\u7684follower\uff0c\u8fd9\u65f6\u5019zk\u8fdb\u5165\u6062\u590d\u6a21\u5f0f\uff0c\u6062\u590d\u6a21\u5f0f\u9700\u8981\u91cd\u65b0\u9009\u4e3e\u51fa\u4e00\u4e2a\u65b0\u7684leader\uff0c\u8ba9\u6240\u6709\u7684 Server\u90fd\u6062\u590d\u5230\u4e00\u4e2a\u6b63\u786e\u7684\u72b6\u6001\u3002Zk\u7684\u9009\u4e3e\u7b97\u6cd5\u6709\u4e24\u79cd\uff1a\u4e00\u79cd\u662f\u57fa\u4e8ebasic paxos\u5b9e\u73b0\u7684\uff0c\u53e6\u5916\u4e00\u79cd\u662f\u57fa\u4e8efast paxos\u7b97\u6cd5\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7cfb\u7edf\u9ed8\u8ba4\u7684\u9009\u4e3e\u7b97\u6cd5\u4e3afast paxos\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">basic paxos\u6d41\u7a0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u9009\u4e3e\u7ebf\u7a0b\u7531\u5f53\u524dServer\u53d1\u8d77\u9009\u4e3e\u7684\u7ebf\u7a0b\u62c5\u4efb\uff0c\u5176\u4e3b\u8981\u529f\u80fd\u662f\u5bf9\u6295\u7968\u7ed3\u679c\u8fdb\u884c\u7edf\u8ba1\uff0c\u5e76\u9009\u51fa\u63a8\u8350\u7684Server\uff1b<\/li><li>\u9009\u4e3e\u7ebf\u7a0b\u9996\u5148\u5411\u6240\u6709Server\u53d1\u8d77\u4e00\u6b21\u8be2\u95ee(\u5305\u62ec\u81ea\u5df1)\uff1b<\/li><li>\u9009\u4e3e\u7ebf\u7a0b\u6536\u5230\u56de\u590d\u540e\uff0c\u9a8c\u8bc1\u662f\u5426\u662f\u81ea\u5df1\u53d1\u8d77\u7684\u8be2\u95ee(\u9a8c\u8bc1zxid\u662f\u5426\u4e00\u81f4)\uff0c\u7136\u540e\u83b7\u53d6\u5bf9\u65b9\u7684id(myid)\uff0c\u5e76\u5b58\u50a8\u5230\u5f53\u524d\u8be2\u95ee\u5bf9\u8c61\u5217\u8868\u4e2d\uff0c\u6700\u540e\u83b7\u53d6\u5bf9\u65b9\u63d0\u8bae\u7684leader\u76f8\u5173\u4fe1\u606f(id,zxid)\uff0c\u5e76\u5c06\u8fd9\u4e9b\u4fe1\u606f\u5b58\u50a8\u5230\u5f53\u6b21\u9009\u4e3e\u7684\u6295\u7968\u8bb0\u5f55\u8868\u4e2d\uff1b<\/li><li>\u6536\u5230\u6240\u6709Server\u56de\u590d\u4ee5\u540e\uff0c\u5c31\u8ba1\u7b97\u51fazxid\u6700\u5927\u7684\u90a3\u4e2aServer\uff0c\u5e76\u5c06\u8fd9\u4e2aServer\u76f8\u5173\u4fe1\u606f\u8bbe\u7f6e\u6210\u4e0b\u4e00\u6b21\u8981\u6295\u7968\u7684Server\uff1b<\/li><li>\u7ebf\u7a0b\u5c06\u5f53\u524dzxid\u6700\u5927\u7684Server\u8bbe\u7f6e\u4e3a\u5f53\u524dServer\u8981\u63a8\u8350\u7684Leader\uff0c\u5982\u679c\u6b64\u65f6\u83b7\u80dc\u7684Server\u83b7\u5f97n\/2 + 1\u7684Server\u7968\u6570\uff0c\u8bbe\u7f6e\u5f53\u524d\u63a8\u8350\u7684leader\u4e3a\u83b7\u80dc\u7684Server\uff0c\u5c06\u6839\u636e\u83b7\u80dc\u7684Server\u76f8\u5173\u4fe1\u606f\u8bbe\u7f6e\u81ea\u5df1\u7684\u72b6\u6001\uff0c\u5426\u5219\uff0c\u7ee7\u7eed\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u76f4\u5230leader\u88ab\u9009\u4e3e\u51fa\u6765\u3002<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u6d41\u7a0b\u5206\u6790\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\uff1a\u8981\u4f7fLeader\u83b7\u5f97\u591a\u6570Server\u7684\u652f\u6301\uff0c\u5219Server\u603b\u6570\u5fc5\u987b\u662f\u5947\u65702n+1\uff0c\u4e14\u5b58\u6d3b\u7684Server\u7684\u6570\u76ee\u4e0d\u5f97\u5c11\u4e8en+1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">fast paxos\u6d41\u7a0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u9009\u4e3e\u8fc7\u7a0b\u4e2d\uff0c\u67d0Server\u9996\u5148\u5411\u6240\u6709Server\u63d0\u8bae\u81ea\u5df1\u8981\u6210\u4e3aleader\uff0c\u5f53\u5176\u5b83Server\u6536\u5230\u63d0\u8bae\u4ee5\u540e\uff0c\u89e3\u51b3epoch\u548c zxid\u7684\u51b2\u7a81\uff0c\u5e76\u63a5\u53d7\u5bf9\u65b9\u7684\u63d0\u8bae\uff0c\u7136\u540e\u5411\u5bf9\u65b9\u53d1\u9001\u63a5\u53d7\u63d0\u8bae\u5b8c\u6210\u7684\u6d88\u606f\uff0c\u91cd\u590d\u8fd9\u4e2a\u6d41\u7a0b\uff0c\u6700\u540e\u4e00\u5b9a\u80fd\u9009\u4e3e\u51faLeader\u3002<\/p>\n\n\n\n<h2>zookeeper\u4e2d\u7684watcher<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Watcher\u662fZookeeper\u7528\u6765\u5b9e\u73b0distribute lock, distribute configure, distribute queue\u7b49\u5e94\u7528\u7684\u4e3b\u8981\u624b\u6bb5\u3002\u8981\u76d1\u63a7data_tree\u4e0a\u7684\u4efb\u4f55\u8282\u70b9\u7684\u53d8\u5316\uff08\u8282\u70b9\u672c\u8eab\u7684\u589e\u52a0\uff0c\u5220\u9664\uff0c\u6570\u636e\u4fee\u6539\uff0c\u4ee5\u53ca\u5b69\u5b50\u7684\u53d8\u5316\uff09\u90fd\u53ef\u4ee5\u5728\u83b7\u53d6\u8be5\u6570\u636e\u65f6\u6ce8\u518c\u4e00\u4e2aWatcher\uff0c\u8fd9\u6709\u5f88\u50cfListener\u6a21\u5f0f\u3002\u4e00\u65e6\u8be5\u8282\u70b9\u6570\u636e\u53d8\u5316\uff0cFollower\u4f1a\u53d1\u9001\u4e00\u4e2anotification response\uff0cclient\u6536\u5230notification\u54cd\u5e94\uff0c\u5219\u4f1a\u67e5\u627e\u5bf9\u5e94\u7684Watcher\u5e76\u56de\u8c03\u4ed6\u4eec<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Client\u53ef\u4ee5\u5728\u67d0\u4e2aZNode\u4e0a\u8bbe\u7f6e\u4e00\u4e2aWatcher\uff0c\u6765Watch\u8be5ZNode\u4e0a\u7684\u53d8\u5316\u3002\u5982\u679c\u8be5ZNode\u4e0a\u6709\u76f8\u5e94\u7684\u53d8\u5316\uff0c\u5c31\u4f1a\u89e6\u53d1\u8fd9\u4e2aWatcher\uff0c\u628a\u76f8\u5e94\u7684\u4e8b\u4ef6\u901a\u77e5\u7ed9\u8bbe\u7f6eWatcher\u7684Client\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cZooKeeper\u4e2d\u7684Watcher\u662f\u4e00\u6b21\u6027\u7684\uff0c\u5373\u89e6\u53d1\u4e00\u6b21\u5c31\u4f1a\u88ab\u53d6\u6d88\uff0c\u5982\u679c\u60f3\u7ee7\u7eedWatch\u7684\u8bdd\uff0c\u9700\u8981\u5ba2\u6237\u7aef\u91cd\u65b0\u8bbe\u7f6eWatcher\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/img-blog.csdn.net\/20170103125226426\" alt=\"\" \/><figcaption>ZooKeeper\u4e2d\u7684Watcher<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/img-blog.csdn.net\/20170103125721368\" alt=\"\" \/><figcaption>ZK \u4e2d\u7684 WatchManager<\/figcaption><\/figure><\/div>\n\n\n\n<h2>atomic broadcasts\u539f\u5b50\u5e7f\u64ad<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zookeeper\u7684\u6838\u5fc3\u662f\u539f\u5b50\u5e7f\u64ad\uff0c\u8fd9\u4e2a\u673a\u5236\u4fdd\u8bc1\u4e86\u5404\u4e2aServer\u4e4b\u95f4\u7684\u540c\u6b65\u3002\u5b9e\u73b0\u8fd9\u4e2a\u673a\u5236\u7684\u534f\u8bae\u53eb\u505aZab\u534f\u8bae\u3002Zab\u534f\u8bae\u6709\u4e24\u79cd\u6a21\u5f0f\uff0c\u5b83\u4eec\u5206 \u522b\u662f\u6062\u590d\u6a21\u5f0f\uff08\u9009\u4e3b\uff09\u548c\u5e7f\u64ad\u6a21\u5f0f\uff08\u540c\u6b65\uff09\u3002\u5f53\u670d\u52a1\u542f\u52a8\u6216\u8005\u5728\u9886\u5bfc\u8005\u5d29\u6e83\u540e\uff0cZab\u5c31\u8fdb\u5165\u4e86\u6062\u590d\u6a21\u5f0f\uff0c\u5f53\u9886\u5bfc\u8005\u88ab\u9009\u4e3e\u51fa\u6765\uff0c\u4e14\u5927\u591a\u6570Server\u5b8c\u6210\u4e86\u548c leader\u7684\u72b6\u6001\u540c\u6b65\u4ee5\u540e\uff0c\u6062\u590d\u6a21\u5f0f\u5c31\u7ed3\u675f\u4e86\u3002\u72b6\u6001\u540c\u6b65\u4fdd\u8bc1\u4e86leader\u548cServer\u5177\u6709\u76f8\u540c\u7684\u7cfb\u7edf\u72b6\u6001<\/p>\n\n\n\n<h2>ZooKeeper Watcher \u7279\u6027\u603b\u7ed3<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>\u6ce8\u518c\u53ea\u80fd\u786e\u4fdd\u4e00\u6b21\u6d88\u8d39\uff1a\u65e0\u8bba\u662f\u670d\u52a1\u7aef\u8fd8\u662f\u5ba2\u6237\u7aef\uff0c\u4e00\u65e6\u4e00\u4e2a Watcher \u88ab\u89e6\u53d1\uff0cZooKeeper \u90fd\u4f1a\u5c06\u5176\u4ece\u76f8\u5e94\u7684\u5b58\u50a8\u4e2d\u79fb\u9664\u3002\u56e0\u6b64\uff0c\u5f00\u53d1\u4eba\u5458\u5728 Watcher \u7684\u4f7f\u7528\u4e0a\u8981\u8bb0\u4f4f\u7684\u4e00\u70b9\u662f\u9700\u8981\u53cd\u590d\u6ce8\u518c\u3002\u8fd9\u6837\u7684\u8bbe\u8ba1\u6709\u6548\u5730\u51cf\u8f7b\u4e86\u670d\u52a1\u7aef\u7684\u538b\u529b\u3002\u5982\u679c\u6ce8\u518c\u4e00\u4e2a Watcher \u4e4b\u540e\u4e00\u76f4\u6709\u6548\uff0c\u90a3\u4e48\u9488\u5bf9\u90a3\u4e9b\u66f4\u65b0\u975e\u5e38\u9891\u7e41\u7684\u8282\u70b9\uff0c\u670d\u52a1\u7aef\u4f1a\u4e0d\u65ad\u5730\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u4e8b\u4ef6\u901a\u77e5\uff0c\u8fd9\u65e0\u8bba\u5bf9\u4e8e\u7f51\u7edc\u8fd8\u662f\u670d\u52a1\u7aef\u6027\u80fd\u7684\u5f71\u54cd\u90fd\u975e\u5e38\u5927\u3002<\/li><li>\u5ba2\u6237\u7aef\u4e32\u884c\u6267\u884c\uff1a\u5ba2\u6237\u7aef Watcher \u56de\u8c03\u7684\u8fc7\u7a0b\u662f\u4e00\u4e2a\u4e32\u884c\u540c\u6b65\u7684\u8fc7\u7a0b\uff0c\u8fd9\u4e3a\u6211\u4eec\u4fdd\u8bc1\u4e86\u987a\u5e8f\uff0c\u540c\u65f6\uff0c\u9700\u8981\u5f00\u53d1\u4eba\u5458\u6ce8\u610f\u7684\u4e00\u70b9\u662f\uff0c\u5343\u4e07\u4e0d\u8981\u56e0\u4e3a\u4e00\u4e2a Watcher \u7684\u5904\u7406\u903b\u8f91\u5f71\u54cd\u4e86\u6574\u4e2a\u5ba2\u6237\u7aef\u7684 Watcher \u56de\u8c03\u3002<\/li><li>\u8f7b\u91cf\u7ea7\u8bbe\u8ba1\uff1aWatchedEvent \u662f ZooKeeper \u6574\u4e2a Watcher \u901a\u77e5\u673a\u5236\u7684\u6700\u5c0f\u901a\u77e5\u5355\u5143\uff0c\u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\u4e2d\u53ea\u5305\u542b\u4e09\u90e8\u5206\u7684\u5185\u5bb9\uff1a\u901a\u77e5\u72b6\u6001\u3001\u4e8b\u4ef6\u7c7b\u578b\u548c\u8282\u70b9\u8def\u5f84\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cWatcher \u901a\u77e5\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u4f1a\u544a\u8bc9\u5ba2\u6237\u7aef\u53d1\u751f\u4e86\u4e8b\u4ef6\uff0c\u800c\u4e0d\u4f1a\u8bf4\u660e\u4e8b\u4ef6\u7684\u5177\u4f53\u5185\u5bb9\u3002\u4f8b\u5982\u9488\u5bf9 NodeDataChanged \u4e8b\u4ef6\uff0cZooKeeper \u7684 Watcher 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