3.1 \u8bfb\u3001\u5199(\u66f4\u65b0)\u6a21\u5f0f<\/strong><\/p>\n\u5728ZooKeeper\u96c6\u7fa4\u4e2d\uff0c\u8bfb\u53ef\u4ee5\u4ece\u4efb\u610f\u4e00\u4e2aZooKeeper Server\u8bfb\uff0c\u8fd9\u4e00\u70b9\u662f\u4fdd\u8bc1ZooKeeper\u6bd4\u8f83\u597d\u7684\u8bfb\u6027\u80fd\u7684\u5173\u952e\uff1b\u5199\u7684\u8bf7\u6c42\u4f1a\u5148Forwarder\u5230Leader\uff0c\u7136\u540e\u7531Leader\u6765\u901a\u8fc7ZooKeeper\u4e2d\u7684\u539f\u5b50\u5e7f\u64ad\u534f\u8bae\uff0c\u5c06\u8bf7\u6c42\u5e7f\u64ad\u7ed9\u6240\u6709\u7684Follower\uff0cLeader\u6536\u5230\u4e00\u534a\u4ee5\u4e0a\u7684\u5199\u6210\u529f\u7684Ack\u540e\uff0c\u5c31\u8ba4\u4e3a\u8be5\u5199\u6210\u529f\u4e86\uff0c\u5c31\u4f1a\u5c06\u8be5\u5199\u8fdb\u884c\u6301\u4e45\u5316\uff0c\u5e76\u544a\u8bc9\u5ba2\u6237\u7aef\u5199\u6210\u529f\u4e86\u3002<\/p>\n
# \u4ece\u4e0d\u540c\u7684\u670d\u52a1\u5668\u8bfb\u5199\r\n\r\n$zoo121 = new Zookeeper(\"192.168.80.121:2181\");\r\n$zoo122 = new Zookeeper(\"192.168.80.122:2181\");\r\n$zoo123 = new Zookeeper(\"192.168.80.123:2181\");\r\n$acl = [['scheme'=>'world', 'id'=>'anyone', 'perms'=>Zookeeper::PERM_ALL]];\r\n\r\n$znode = $zoo121->create('\/redis','abc',$acl,Zookeeper::EPHEMERAL | Zookeeper::SEQUENCE);\r\nprint_r($znode);\r\n\r\n$znode = $zoo123->get($znode);\r\nprint_r($znode);<\/pre>\n3.2 WAL\u548cSnapshot<\/strong><\/p>\n\u548c\u5927\u591a\u6570\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e00\u6837\uff0cZooKeeper\u4e5f\u6709WAL(Write-Ahead-Log)\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u66f4\u65b0\u64cd\u4f5c\uff0cZooKeeper\u90fd\u4f1a\u5148\u5199WAL, \u7136\u540e\u518d\u5bf9\u5185\u5b58\u4e2d\u7684\u6570\u636e\u505a\u66f4\u65b0\uff0c\u7136\u540e\u5411Client\u901a\u77e5\u66f4\u65b0\u7ed3\u679c\u3002\u53e6\u5916\uff0cZooKeeper\u8fd8\u4f1a\u5b9a\u671f\u5c06\u5185\u5b58\u4e2d\u7684\u76ee\u5f55\u6811\u8fdb\u884cSnapshot\uff08\u4e2d\u6587\u7ffb\u8bd1\uff1a\u5feb\u7167\uff09\uff0c\u843d\u5730\u5230\u78c1\u76d8\u4e0a\uff0c\u8fd9\u4e2a\u8ddfHDFS\u4e2d\u7684FSImage\u662f\u6bd4\u8f83\u7c7b\u4f3c\u7684\u3002\u8fd9\u4e48\u505a\u7684\u4e3b\u8981\u76ee\u7684\uff0c\u4e00\u5f53\u7136\u662f\u6570\u636e\u7684\u6301\u4e45\u5316\uff0c\u4e8c\u662f\u52a0\u5feb\u91cd\u542f\u4e4b\u540e\u7684\u6062\u590d\u901f\u5ea6\uff0c\u5982\u679c\u5168\u90e8\u901a\u8fc7Replay WAL\u7684\u5f62\u5f0f\u6062\u590d\u7684\u8bdd\uff0c\u4f1a\u6bd4\u8f83\u6162\u3002<\/p>\n
Tips\uff1az<\/strong>ookeeper\u7c7b\u4f3c\u4e8emongodb\u3001redis\u7b49\uff0c\u4e5f\u4f1a\u6709\u54cd\u5e94\u7684opLog\uff0c\u4f46zookeeper\u7684\u6301\u4e45\u5316\uff0c\u91c7\u7528opLog\u800c\u662f\u91c7\u7528\u5feb\u7167\uff0c\u8fd9\u4e2a\u4e5f\u662f\u6e90\u4e8ezookeeper\u5b58\u50a8\u7684\u6570\u636e\u91cf\u5c0f\u3002\u5982\u679c\u8981\u4f7f\u7528zookeeper\u5b58\u50a8\u5927\u91cf\u7684\u6570\u636e\uff0c\u5c31\u9700\u8981\u6ce8\u610f\u4e0b\u4e86\u3002<\/p>\n3.3 FIFO<\/strong><\/p>\n\u5bf9\u4e8e\u6bcf\u4e00\u4e2aZooKeeper\u5ba2\u6237\u7aef\u800c\u8a00\uff0c\u6240\u6709\u7684\u64cd\u4f5c\u90fd\u662f\u9075\u5faaFIFO\u987a\u5e8f\u7684\uff0c\u8fd9\u4e00\u7279\u6027\u662f\u7531\u4e0b\u9762\u4e24\u4e2a\u57fa\u672c\u7279\u6027\u6765\u4fdd\u8bc1\u7684\uff1a\u4e00\u662fZooKeeper Client\u4e0eServer\u4e4b\u95f4\u7684\u7f51\u7edc\u901a\u4fe1\u662f\u57fa\u4e8eTCP\uff0cTCP\u4fdd\u8bc1\u4e86Client\/Server\u4e4b\u95f4\u4f20\u8f93\u5305\u7684\u987a\u5e8f\uff1b\u4e8c\u662fZooKeeper Server\u6267\u884c\u5ba2\u6237\u7aef\u8bf7\u6c42\u4e5f\u662f\u4e25\u683c\u6309\u7167FIFO\u987a\u5e8f\u7684\u3002<\/p>\n
3.4 Linearizability<\/strong><\/p>\n\u5728ZooKeeper\u4e2d\uff0c\u6240\u6709\u7684\u66f4\u65b0\u64cd\u4f5c\u90fd\u6709\u4e25\u683c\u7684\u504f\u5e8f\u5173\u7cfb\uff0c\u66f4\u65b0\u64cd\u4f5c\u90fd\u662f\u4e32\u884c\u6267\u884c\u7684\uff0c\u8fd9\u4e00\u70b9\u662f\u4fdd\u8bc1ZooKeeper\u529f\u80fd\u6b63\u786e\u6027\u7684\u5173\u952e\u3002<\/p>\n
ZooKeeper Client API<\/h1>\n
ZooKeeper Client Library\u63d0\u4f9b\u4e86\u4e30\u5bcc\u76f4\u89c2\u7684API\u4f9b\u7528\u6237\u7a0b\u5e8f\u4f7f\u7528\uff0c\u4e0b\u9762\u662f\u4e00\u4e9b\u5e38\u7528\u7684API\uff1a<\/p>\n
\n- create(path, data, flags): \u521b\u5efa\u4e00\u4e2aZNode, path\u662f\u5176\u8def\u5f84\uff0cdata\u662f\u8981\u5b58\u50a8\u5728\u8be5ZNode\u4e0a\u7684\u6570\u636e\uff0cflags\u5e38\u7528\u7684\u6709: PERSISTEN, PERSISTENT_SEQUENTAIL, EPHEMERAL, EPHEMERAL_SEQUENTAIL<\/li>\n
- delete(path, version): \u5220\u9664\u4e00\u4e2aZNode\uff0c\u53ef\u4ee5\u901a\u8fc7version\u5220\u9664\u6307\u5b9a\u7684\u7248\u672c, \u5982\u679cversion\u662f-1\u7684\u8bdd\uff0c\u8868\u793a\u5220\u9664\u6240\u6709\u7684\u7248\u672c<\/li>\n
- exists(path, watch): \u5224\u65ad\u6307\u5b9aZNode\u662f\u5426\u5b58\u5728\uff0c\u5e76\u8bbe\u7f6e\u662f\u5426Watch\u8fd9\u4e2aZNode\u3002\u8fd9\u91cc\u5982\u679c\u8981\u8bbe\u7f6eWatcher\u7684\u8bdd\uff0cWatcher\u662f\u5728\u521b\u5efaZooKeeper\u5b9e\u4f8b\u65f6\u6307\u5b9a\u7684\uff0c\u5982\u679c\u8981\u8bbe\u7f6e\u7279\u5b9a\u7684Watcher\u7684\u8bdd\uff0c\u53ef\u4ee5\u8c03\u7528\u53e6\u4e00\u4e2a\u91cd\u8f7d\u7248\u672c\u7684exists(path, watcher)\u3002\u4ee5\u4e0b\u51e0\u4e2a\u5e26watch\u53c2\u6570\u7684API\u4e5f\u90fd\u7c7b\u4f3c<\/li>\n
- getData(path, watch): \u8bfb\u53d6\u6307\u5b9aZNode\u4e0a\u7684\u6570\u636e\uff0c\u5e76\u8bbe\u7f6e\u662f\u5426watch\u8fd9\u4e2aZNode<\/li>\n
- setData(path, watch): \u66f4\u65b0\u6307\u5b9aZNode\u7684\u6570\u636e\uff0c\u5e76\u8bbe\u7f6e\u662f\u5426Watch\u8fd9\u4e2aZNode<\/li>\n
- getChildren(path, watch): \u83b7\u53d6\u6307\u5b9aZNode\u7684\u6240\u6709\u5b50ZNode\u7684\u540d\u5b57\uff0c\u5e76\u8bbe\u7f6e\u662f\u5426Watch\u8fd9\u4e2aZNode<\/li>\n
- sync(path): \u628a\u6240\u6709\u5728sync\u4e4b\u524d\u7684\u66f4\u65b0\u64cd\u4f5c\u90fd\u8fdb\u884c\u540c\u6b65\uff0c\u8fbe\u5230\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u5728\u534a\u6570\u4ee5\u4e0a\u7684ZooKeeper Server\u4e0a\u751f\u6548\u3002path\u53c2\u6570\u76ee\u524d\u6ca1\u6709\u7528<\/li>\n
- setAcl(path, acl): \u8bbe\u7f6e\u6307\u5b9aZNode\u7684Acl\u4fe1\u606f<\/li>\n
- getAcl(path): \u83b7\u53d6\u6307\u5b9aZNode\u7684Acl\u4fe1\u606f<\/li>\n<\/ol>\n
Tips\uff1a<\/strong>zookeeper\u7684\u547d\u4ee4\u64cd\u4f5c\u53c2\u8003\uff1aZookeeper\u4e2d\u7684\u547d\u4ee4
\nPHP\u4e2d\u7684API\u53c2\u8003\uff1aPHP\u4e2dzookeeper\u7684\u7c7b\u4e0e\u65b9\u6cd5<\/p>\nZooKeeper\u5178\u578b\u5e94\u7528\u573a\u666f<\/h1>\n1. \u540d\u5b57\u670d\u52a1(NameService)<\/h3>\n
\u5206\u5e03\u5f0f\u5e94\u7528\u4e2d\uff0c\u901a\u5e38\u9700\u8981\u4e00\u5957\u5b8c\u5907\u7684\u547d\u4ee4\u673a\u5236\uff0c\u65e2\u80fd\u4ea7\u751f\u552f\u4e00\u7684\u6807\u8bc6\uff0c\u53c8\u65b9\u4fbf\u4eba\u8bc6\u522b\u548c\u8bb0\u5fc6\u3002 \u6211\u4eec\u77e5\u9053\uff0c\u6bcf\u4e2aZNode\u90fd\u53ef\u4ee5\u7531\u5176\u8def\u5f84\u552f\u4e00\u6807\u8bc6\uff0c\u8def\u5f84\u672c\u8eab\u4e5f\u6bd4\u8f83\u7b80\u6d01\u76f4\u89c2\uff0c\u53e6\u5916ZNode\u4e0a\u8fd8\u53ef\u4ee5\u5b58\u50a8\u5c11\u91cf\u6570\u636e\uff0c\u8fd9\u4e9b\u90fd\u662f\u5b9e\u73b0\u7edf\u4e00\u7684NameService\u7684\u57fa\u7840\u3002\u4e0b\u9762\u4ee5\u5728HDFS\u4e2d\u5b9e\u73b0NameService\u4e3a\u4f8b\uff0c\u6765\u8bf4\u660e\u5b9e\u73b0NameService\u7684<\/p>\n
\u57fa\u672c\u5e03\u9aa4:<\/strong><\/p>\n\n- \u76ee\u6807\uff1a\u901a\u8fc7\u7b80\u5355\u7684\u540d\u5b57\u6765\u8bbf\u95ee\u6307\u5b9a\u7684HDFS\u673a\u7fa4<\/li>\n
- \u5b9a\u4e49\u547d\u540d\u89c4\u5219\uff1a\u8fd9\u91cc\u8981\u505a\u5230\u7b80\u6d01\u6613\u8bb0\u5fc6\u3002\u4e0b\u9762\u662f\u4e00\u79cd\u53ef\u9009\u7684\u65b9\u6848\uff1a [serviceScheme:\/\/][zkCluster]-[clusterName]\uff0c\u6bd4\u5982hdfs:\/\/lgprc-example\/\u8868\u793a\u57fa\u4e8elgprc ZooKeeper\u96c6\u7fa4\u7684\u7528\u6765\u505aexample\u7684HDFS\u96c6\u7fa4<\/li>\n
- \u914d\u7f6eDNS\u6620\u5c04: \u5c06zkCluster\u7684\u6807\u8bc6lgprc\u901a\u8fc7DNS\u89e3\u6790\u5230\u5bf9\u5e94\u7684ZooKeeper\u96c6\u7fa4\u7684\u5730\u5740<\/li>\n
- \u521b\u5efaZNode: \u5728\u5bf9\u5e94\u7684ZooKeeper\u4e0a\u521b\u5efa\/NameService\/hdfs\/lgprc-example\u7ed3\u70b9\uff0c\u5c06HDFS\u7684\u914d\u7f6e\u6587\u4ef6\u5b58\u50a8\u4e8e\u8be5\u7ed3\u70b9\u4e0b,\u7528\u6237\u7a0b\u5e8f\u8981\u8bbf\u95eehdfs:\/\/lgprc-example\/\u7684HDFS\u96c6\u7fa4\uff0c\u9996\u5148\u901a\u8fc7DNS\u627e\u5230lgprc\u7684ZooKeeper\u673a\u7fa4\u7684\u5730\u5740\uff0c\u7136\u540e\u5728ZooKeeper\u7684\/NameService\/hdfs\/lgprc-example\u7ed3\u70b9\u4e2d\u8bfb\u53d6\u5230HDFS\u7684\u914d\u7f6e\uff0c\u8fdb\u800c\u6839\u636e\u5f97\u5230\u7684\u914d\u7f6e\uff0c\u5f97\u5230HDFS\u7684\u5b9e\u9645\u8bbf\u95ee\u5165\u53e3<\/li>\n<\/ol>\n
2. \u914d\u7f6e\u7ba1\u7406(Configuration Management)<\/h3>\n
\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5e38\u4f1a\u9047\u5230\u8fd9\u6837\u7684\u573a\u666f: \u67d0\u4e2aJob\u7684\u5f88\u591a\u4e2a\u5b9e\u4f8b\u5728\u8fd0\u884c\uff0c\u5b83\u4eec\u5728\u8fd0\u884c\u65f6\u5927\u591a\u6570\u914d\u7f6e\u9879\u662f\u76f8\u540c\u7684\uff0c\u5982\u679c\u60f3\u8981\u7edf\u4e00\u6539\u67d0\u4e2a\u914d\u7f6e\uff0c\u4e00\u4e2a\u4e2a\u5b9e\u4f8b\u53bb\u6539\uff0c\u662f\u6bd4\u8f83\u4f4e\u6548\uff0c\u4e5f\u662f\u6bd4\u8f83\u5bb9\u6613\u51fa\u9519\u7684\u65b9\u5f0f\u3002\u901a\u8fc7ZooKeeper\u53ef\u4ee5\u5f88\u597d\u7684\u89e3\u51b3\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u4e0b\u9762\u7684\u57fa\u672c\u7684\u6b65\u9aa4\uff1a<\/p>\n
\n- \u5c06\u516c\u5171\u7684\u914d\u7f6e\u5185\u5bb9\u653e\u5230ZooKeeper\u4e2d\u67d0\u4e2aZNode\u4e0a\uff0c\u6bd4\u5982\/service\/common-conf<\/li>\n
- \u6240\u6709\u7684\u5b9e\u4f8b\u5728\u542f\u52a8\u65f6\u90fd\u4f1a\u4f20\u5165ZooKeeper\u96c6\u7fa4\u7684\u5165\u53e3\u5730\u5740\uff0c\u5e76\u4e14\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2dWatch \/service\/common-conf\u8fd9\u4e2aZNode<\/li>\n
- \u5982\u679c\u96c6\u7fa4\u7ba1\u7406\u5458\u4fee\u6539\u4e86\u4e86common-conf\uff0c\u6240\u6709\u7684\u5b9e\u4f8b\u90fd\u4f1a\u88ab\u901a\u77e5\u5230\uff0c\u6839\u636e\u6536\u5230\u7684\u901a\u77e5\u66f4\u65b0\u81ea\u5df1\u7684\u914d\u7f6e\uff0c\u5e76\u7ee7\u7eedWatch \/service\/common-conf<\/li>\n<\/ol>\n
3. \u7ec4\u5458\u7ba1\u7406(Group Membership)<\/h3>\n
\u5728\u5178\u578b\u7684Master-Slave\u7ed3\u6784\u7684\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0cMaster\u9700\u8981\u4f5c\u4e3a\u201c\u603b\u7ba1\u201d\u6765\u7ba1\u7406\u6240\u6709\u7684Slave, \u5f53\u6709Slave\u52a0\u5165\uff0c\u6216\u8005\u6709Slave\u5b95\u673a\uff0cMaster\u90fd\u9700\u8981\u611f\u77e5\u5230\u8fd9\u4e2a\u4e8b\u60c5\uff0c\u7136\u540e\u4f5c\u51fa\u5bf9\u5e94\u7684\u8c03\u6574\uff0c\u4ee5\u4fbf\u4e0d\u5f71\u54cd\u6574\u4e2a\u96c6\u7fa4\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\u3002\u4ee5Hbase\u4e3a\u4f8b\uff0cHMaster\u7ba1\u7406\u4e86\u6240\u6709\u7684RegionServer\uff0c\u5f53\u6709\u65b0\u7684RegionServer\u52a0\u5165\u7684\u65f6\u5019\uff0cHMaster\u9700\u8981\u5206\u914d\u4e00\u4e9bRegion\u5230\u8be5RegionServer\u4e0a\u53bb\uff0c\u8ba9\u5176\u63d0\u4f9b\u670d\u52a1\uff1b\u5f53\u6709RegionServer\u5b95\u673a\u65f6\uff0cHMaster\u9700\u8981\u5c06\u8be5RegionServer\u4e4b\u524d\u670d\u52a1\u7684Region\u90fd\u91cd\u65b0\u5206\u914d\u5230\u5f53\u524d\u6b63\u5728\u63d0\u4f9b\u670d\u52a1\u7684\u5176\u5b83RegionServer\u4e0a\uff0c\u4ee5\u4fbf\u4e0d\u5f71\u54cd\u5ba2\u6237\u7aef\u7684\u6b63\u5e38\u8bbf\u95ee\u3002\u4e0b\u9762\u662f\u8fd9\u79cd\u573a\u666f\u4e0b\u4f7f\u7528ZooKeeper\u7684\u57fa\u672c\u6b65\u9aa4\uff1a<\/p>\n
\n- Master\u5728ZooKeeper\u4e0a\u521b\u5efa\/service\/slaves\u7ed3\u70b9\uff0c\u5e76\u8bbe\u7f6e\u5bf9\u8be5\u7ed3\u70b9\u7684Watcher<\/li>\n
- \u6bcf\u4e2aSlave\u5728\u542f\u52a8\u6210\u529f\u540e\uff0c\u521b\u5efa\u552f\u4e00\u6807\u8bc6\u81ea\u5df1\u7684\u4e34\u65f6\u6027(Ephemeral)\u7ed3\u70b9\/service\/slaves\/${slave_id}\uff0c\u5e76\u5c06\u81ea\u5df1\u5730\u5740(ip\/port)\u7b49\u76f8\u5173\u4fe1\u606f\u5199\u5165\u8be5\u7ed3\u70b9<\/li>\n
- Master\u6536\u5230\u6709\u65b0\u5b50\u7ed3\u70b9\u52a0\u5165\u7684\u901a\u77e5\u540e\uff0c\u505a\u76f8\u5e94\u7684\u5904\u7406<\/li>\n
- \u5982\u679c\u6709Slave\u5b95\u673a\uff0c\u7531\u4e8e\u5b83\u6240\u5bf9\u5e94\u7684\u7ed3\u70b9\u662f\u4e34\u65f6\u6027\u7ed3\u70b9\uff0c\u5728\u5b83\u7684Session\u8d85\u65f6\u540e\uff0cZooKeeper\u4f1a\u81ea\u52a8\u5220\u9664\u8be5\u7ed3\u70b9<\/li>\n
- Master\u6536\u5230\u6709\u5b50\u7ed3\u70b9\u6d88\u5931\u7684\u901a\u77e5\uff0c\u505a\u76f8\u5e94\u7684\u5904\u7406<\/li>\n<\/ol>\n
4. \u7b80\u5355\u4e92\u65a5\u9501(Simple Lock)<\/h3>\n
\u6211\u4eec\u77e5\u8bc6\uff0c\u5728\u4f20\u7edf\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u7ebf\u7a0b\u3001\u8fdb\u7a0b\u7684\u540c\u6b65\uff0c\u90fd\u53ef\u4ee5\u901a\u8fc7\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u673a\u5236\u6765\u5b8c\u6210\u3002\u4f46\u662f\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u591a\u4e2a\u8fdb\u7a0b\u4e4b\u95f4\u7684\u540c\u6b65\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5c42\u9762\u5c31\u65e0\u80fd\u4e3a\u529b\u4e86\u3002\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u50cfZooKeeper\u8fd9\u6837\u7684\u5206\u5e03\u5f0f\u7684\u534f\u8c03(Coordination)\u670d\u52a1\u6765\u534f\u52a9\u5b8c\u6210\u540c\u6b65\uff0c\u4e0b\u9762\u662f\u7528ZooKeeper\u5b9e\u73b0\u7b80\u5355\u7684\u4e92\u65a5\u9501\u7684\u6b65\u9aa4\uff0c\u8fd9\u4e2a\u53ef\u4ee5\u548c\u7ebf\u7a0b\u95f4\u540c\u6b65\u7684mutex\u505a\u7c7b\u6bd4\u6765\u7406\u89e3\uff1a<\/p>\n
\u591a\u4e2a\u8fdb\u7a0b\u5c1d\u8bd5\u53bb\u5728\u6307\u5b9a\u7684\u76ee\u5f55\u4e0b\u53bb\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u6027(Ephemeral)\u7ed3\u70b9 \/locks\/my_lock\uff0cZooKeeper\u80fd\u4fdd\u8bc1\uff0c\u53ea\u4f1a\u6709\u4e00\u4e2a\u8fdb\u7a0b\u6210\u529f\u521b\u5efa\u8be5\u7ed3\u70b9\uff0c\u521b\u5efa\u7ed3\u70b9\u6210\u529f\u7684\u8fdb\u7a0b\u5c31\u662f\u62a2\u5230\u9501\u7684\u8fdb\u7a0b\uff0c\u5047\u8bbe\u8be5\u8fdb\u7a0b\u4e3aA\uff0c\u5176\u5b83\u8fdb\u7a0b\u90fd\u5bf9\/locks\/my_lock\u8fdb\u884cWatch,\u5f53A\u8fdb\u7a0b\u4e0d\u518d\u9700\u8981\u9501\uff0c\u53ef\u4ee5\u663e\u5f0f\u5220\u9664\/locks\/my_lock\u91ca\u653e\u9501\uff1b\u6216\u8005\u662fA\u8fdb\u7a0b\u5b95\u673a\u540eSession\u8d85\u65f6\uff0cZooKeeper\u7cfb\u7edf\u81ea\u52a8\u5220\u9664\/locks\/my_lock\u7ed3\u70b9\u91ca\u653e\u9501\u3002\u6b64\u65f6\uff0c\u5176\u5b83\u8fdb\u7a0b\u5c31\u4f1a\u6536\u5230ZooKeeper\u7684\u901a\u77e5\uff0c\u5e76\u5c1d\u8bd5\u53bb\u521b\u5efa\/locks\/my_lock\u62a2\u9501\uff0c\u5982\u6b64\u5faa\u73af\u53cd\u590d.<\/p>\n
5. \u4e92\u65a5\u9501(Simple Lock without Herd Effect)<\/h3>\n
\u4e0a\u4e00\u8282\u7684\u4f8b\u5b50\u4e2d\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u6bcf\u6b21\u62a2\u9501\u90fd\u4f1a\u6709\u5927\u91cf\u7684\u8fdb\u7a0b\u53bb\u7ade\u4e89\uff0c\u4f1a\u9020\u6210\u7f8a\u7fa4\u6548\u5e94(Herd Effect)\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e0b\u9762\u7684\u6b65\u9aa4\u6765\u6539\u8fdb\u4e0a\u8ff0\u8fc7\u7a0b\uff1a<\/p>\n
\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u5728ZooKeeper\u4e0a\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u7684\u987a\u5e8f\u7ed3\u70b9(Ephemeral Sequential) \/locks\/lock_${seq}
\n${seq}\u6700\u5c0f\u7684\u4e3a\u5f53\u524d\u7684\u6301\u9501\u8005(${seq}\u662fZooKeeper\u751f\u6210\u7684Sequenctial Number)
\n\u5176\u5b83\u8fdb\u7a0b\u90fd\u5bf9\u53eawatch\u6bd4\u5b83\u6b21\u5c0f\u7684\u8fdb\u7a0b\u5bf9\u5e94\u7684\u7ed3\u70b9\uff0c\u6bd4\u59822 watch 1, 3 watch 2, \u4ee5\u6b64\u7c7b\u63a8
\n\u5f53\u524d\u6301\u9501\u8005\u91ca\u653e\u9501\u540e\uff0c\u6bd4\u5b83\u6b21\u5927\u7684\u8fdb\u7a0b\u5c31\u4f1a\u6536\u5230ZooKeeper\u7684\u901a\u77e5\uff0c\u5b83\u6210\u4e3a\u65b0\u7684\u6301\u9501\u8005\uff0c\u5982\u6b64\u5faa\u73af\u53cd\u590d
\n\u8fd9\u91cc\u9700\u8981\u8865\u5145\u4e00\u70b9\uff0c\u901a\u5e38\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7528ZooKeeper\u6765\u505aLeader Election(\u9009\u4e3b)\u5c31\u662f\u901a\u8fc7\u4e0a\u9762\u7684\u673a\u5236\u6765\u5b9e\u73b0\u7684\uff0c\u8fd9\u91cc\u7684\u6301\u9501\u8005\u5c31\u662f\u5f53\u524d\u7684\u201c\u4e3b\u201d\u3002<\/p>\n
6. \u8bfb\u5199\u9501(Read\/Write Lock)<\/h3>\n
\u6211\u4eec\u77e5\u9053\uff0c\u8bfb\u5199\u9501\u8ddf\u4e92\u65a5\u9501\u76f8\u6bd4\u4e0d\u540c\u7684\u5730\u65b9\u662f\uff0c\u5b83\u5206\u6210\u4e86\u8bfb\u548c\u5199\u4e24\u79cd\u6a21\u5f0f\uff0c\u591a\u4e2a\u8bfb\u53ef\u4ee5\u5e76\u53d1\u6267\u884c\uff0c\u4f46\u5199\u548c\u8bfb\u3001\u5199\u90fd\u4e92\u65a5\uff0c\u4e0d\u80fd\u540c\u65f6\u6267\u884c\u884c\u3002\u5229\u7528ZooKeeper\uff0c\u5728\u4e0a\u9762\u7684\u57fa\u7840\u4e0a\uff0c\u7a0d\u505a\u4fee\u6539\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4f20\u7edf\u7684\u8bfb\u5199\u9501\u7684\u8bed\u4e49\uff0c\u4e0b\u9762\u662f\u57fa\u672c\u7684\u6b65\u9aa4:<\/p>\n
\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u5728ZooKeeper\u4e0a\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u7684\u987a\u5e8f\u7ed3\u70b9(Ephemeral Sequential) \/locks\/lock_${seq}
\n${seq}\u6700\u5c0f\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u7ed3\u70b9\u4e3a\u5f53\u524d\u7684\u6301\u9501\u8005\uff0c\u591a\u4e2a\u662f\u56e0\u4e3a\u591a\u4e2a\u8bfb\u53ef\u4ee5\u5e76\u53d1
\n\u9700\u8981\u5199\u9501\u7684\u8fdb\u7a0b\uff0cWatch\u6bd4\u5b83\u6b21\u5c0f\u7684\u8fdb\u7a0b\u5bf9\u5e94\u7684\u7ed3\u70b9
\n\u9700\u8981\u8bfb\u9501\u7684\u8fdb\u7a0b\uff0cWatch\u6bd4\u5b83\u5c0f\u7684\u6700\u540e\u4e00\u4e2a\u5199\u8fdb\u7a0b\u5bf9\u5e94\u7684\u7ed3\u70b9
\n\u5f53\u524d\u7ed3\u70b9\u91ca\u653e\u9501\u540e\uff0c\u6240\u6709Watch\u8be5\u7ed3\u70b9\u7684\u8fdb\u7a0b\u90fd\u4f1a\u88ab\u901a\u77e5\u5230\uff0c\u4ed6\u4eec\u6210\u4e3a\u65b0\u7684\u6301\u9501\u8005\uff0c\u5982\u6b64\u5faa\u73af\u53cd\u590d<\/p>\n
7. \u5c4f\u969c(Barrier)<\/h3>\n
\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5c4f\u969c\u662f\u8fd9\u6837\u4e00\u79cd\u8bed\u4e49: \u5ba2\u6237\u7aef\u9700\u8981\u7b49\u5f85\u591a\u4e2a\u8fdb\u7a0b\u5b8c\u6210\u5404\u81ea\u7684\u4efb\u52a1\uff0c\u7136\u540e\u624d\u80fd\u7ee7\u7eed\u5f80\u524d\u8fdb\u884c\u4e0b\u4e00\u6b65\u3002\u4e0b\u7528\u662f\u7528ZooKeeper\u6765\u5b9e\u73b0\u5c4f\u969c\u7684\u57fa\u672c\u6b65\u9aa4\uff1a<\/p>\n
Client\u5728ZooKeeper\u4e0a\u521b\u5efa\u5c4f\u969c\u7ed3\u70b9\/barrier\/my_barrier\uff0c\u5e76\u542f\u52a8\u6267\u884c\u5404\u4e2a\u4efb\u52a1\u7684\u8fdb\u7a0b
\nClient\u901a\u8fc7exist()\u6765Watch \/barrier\/my_barrier\u7ed3\u70b9
\n\u6bcf\u4e2a\u4efb\u52a1\u8fdb\u7a0b\u5728\u5b8c\u6210\u4efb\u52a1\u540e\uff0c\u53bb\u68c0\u67e5\u662f\u5426\u8fbe\u5230\u6307\u5b9a\u7684\u6761\u4ef6\uff0c\u5982\u679c\u6ca1\u8fbe\u5230\u5c31\u5565\u4e5f\u4e0d\u505a\uff0c\u5982\u679c\u8fbe\u5230\u4e86\u5c31\u628a\/barrier\/my_barrier\u7ed3\u70b9\u5220\u9664
\nClient\u6536\u5230\/barrier\/my_barrier\u88ab\u5220\u9664\u7684\u901a\u77e5\uff0c\u5c4f\u969c\u6d88\u5931\uff0c\u7ee7\u7eed\u4e0b\u4e00\u6b65\u4efb\u52a1<\/p>\n
8. \u53cc\u5c4f\u969c(Double Barrier)<\/h3>\n
\u53cc\u5c4f\u969c\u662f\u8fd9\u6837\u4e00\u79cd\u8bed\u4e49: \u5b83\u53ef\u4ee5\u7528\u6765\u540c\u6b65\u4e00\u4e2a\u4efb\u52a1\u7684\u5f00\u59cb\u548c\u7ed3\u675f\uff0c\u5f53\u6709\u8db3\u591f\u591a\u7684\u8fdb\u7a0b\u8fdb\u5165\u5c4f\u969c\u540e\uff0c\u624d\u5f00\u59cb\u6267\u884c\u4efb\u52a1\uff1b\u5f53\u6240\u6709\u7684\u8fdb\u7a0b\u90fd\u6267\u884c\u5b8c\u5404\u81ea\u7684\u4efb\u52a1\u540e\uff0c\u5c4f\u969c\u624d\u64a4\u9500\u3002\u4e0b\u9762\u662f\u7528ZooKeeper\u6765\u5b9e\u73b0\u53cc\u5c4f\u969c\u7684\u57fa\u672c\u6b65\u9aa4\uff1a<\/p>\n
\u8fdb\u5165\u5c4f\u969c\uff1a<\/strong><\/p>\nClient Watch \/barrier\/ready\u7ed3\u70b9, \u901a\u8fc7\u5224\u65ad\u8be5\u7ed3\u70b9\u662f\u5426\u5b58\u5728\u6765\u51b3\u5b9a\u662f\u5426\u542f\u52a8\u4efb\u52a1
\n\u6bcf\u4e2a\u4efb\u52a1\u8fdb\u7a0b\u8fdb\u5165\u5c4f\u969c\u65f6\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u7ed3\u70b9\/barrier\/process\/${process_id}\uff0c\u7136\u540e\u68c0\u67e5\u8fdb\u5165\u5c4f\u969c\u7684\u7ed3\u70b9\u6570\u662f\u5426\u8fbe\u5230\u6307\u5b9a\u7684\u503c\uff0c\u5982\u679c\u8fbe\u5230\u4e86\u6307\u5b9a\u7684\u503c\uff0c\u5c31\u521b\u5efa\u4e00\u4e2a\/barrier\/ready\u7ed3\u70b9\uff0c\u5426\u5219\u7ee7\u7eed\u7b49\u5f85
\nClient\u6536\u5230\/barrier\/ready\u521b\u5efa\u7684\u901a\u77e5\uff0c\u5c31\u542f\u52a8\u4efb\u52a1\u6267\u884c\u8fc7\u7a0b<\/p>\n
\u79bb\u5f00\u5c4f\u969c\uff1a<\/strong><\/p>\nClient Watch \/barrier\/process\uff0c\u5982\u679c\u5176\u6ca1\u6709\u5b50\u7ed3\u70b9\uff0c\u5c31\u53ef\u4ee5\u8ba4\u4e3a\u4efb\u52a1\u6267\u884c\u7ed3\u675f\uff0c\u53ef\u4ee5\u79bb\u5f00\u5c4f\u969c
\n\u6bcf\u4e2a\u4efb\u52a1\u8fdb\u7a0b\u6267\u884c\u4efb\u52a1\u7ed3\u675f\u540e\uff0c\u90fd\u9700\u8981\u5220\u9664\u81ea\u5df1\u5bf9\u5e94\u7684\u7ed3\u70b9\/barrier\/process\/${process_id}<\/p>\n","protected":false},"excerpt":{"rendered":"
ZooKeeper\u662fHadoop Ecosystem\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u7ec4\u4ef6\uff0c\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u662f\u4e3a\u5206\u5e03\u5f0f\u7cfb\u7edf\u63d0\u4f9b\u4e00\u81f4\u6027\u534f\u8c03(Coordination)\u670d\u52a1\uff0c\u4e0e\u4e4b\u5bf9\u5e94\u7684Google\u7684\u7c7b\u4f3c\u670d\u52a1\u53ebChubby\u3002\u4eca\u5929\u8fd9\u7bc7\u6587\u7ae0\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206\u6765\u4ecb\u7ecdZooKeeper\uff0c\u7b2c\u4e00\u90e8\u5206\u4ecb\u7ecdZooKeeper\u7684\u57fa\u672c\u539f\u7406\uff0c\u7b2c\u4e8c\u90e8\u5206\u4ecb\u7ecdZooKeeper\u63d0\u4f9b\u7684Client API\u7684\u4f7f\u7528\uff0c\u7b2c\u4e09\u90e8\u5206\u4ecb\u7ecd\u4e00\u4e9bZooKeeper\u5178\u578b\u7684\u5e94\u7528\u573a\u666f\u3002 ZooKeeper\u57fa\u672c\u539f\u7406 1\u3001\u6570\u636e\u6a21\u578b \u5982\u4e0a\u56fe\u6240\u793a\uff0cZooKeeper\u6570\u636e\u6a21\u578b\u7684\u7ed3\u6784\u4e0eUnix\u6587\u4ef6\u7cfb\u7edf\u5f88\u7c7b\u4f3c\uff0c\u6574\u4f53\u4e0a\u53ef\u4ee5\u770b\u4f5c\u662f\u4e00\u68f5\u6811\uff0c\u6bcf\u4e2a\u8282\u70b9\u79f0\u505a\u4e00\u4e2aZNode\u3002\u6bcf\u4e2aZNode\u90fd\u53ef\u4ee5\u901a\u8fc7\u5176\u8def\u5f84\u552f\u4e00\u6807\u8bc6\uff0c\u6bd4\u5982\u4e0a\u56fe\u4e2d\u7b2c\u4e09\u5c42\u7684\u7b2c\u4e00\u4e2aZNode, \u5b83\u7684\u8def\u5f84\u662f\/app1\/c1\u3002\u5728\u6bcf\u4e2aZNode\u4e0a\u53ef\u5b58\u50a8\u5c11\u91cf\u6570\u636e(\u9ed8\u8ba4\u662f1M, \u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u4fee\u6539, 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ZooKeeper\u7279\u6027 3.1 \u8bfb\u3001\u5199(\u66f4\u65b0)\u6a21\u5f0f \u5728ZooKeeper\u96c6\u7fa4\u4e2d\uff0c\u8bfb\u53ef\u4ee5\u4ece\u4efb\u610f\u4e00\u4e2aZooKeeper Server\u8bfb\uff0c\u8fd9\u4e00\u70b9\u662f\u4fdd\u8bc1ZooKeeper\u6bd4\u8f83\u597d\u7684\u8bfb\u6027\u80fd\u7684\u5173\u952e\uff1b\u5199\u7684\u8bf7\u6c42\u4f1a\u5148Forwarder\u5230Leader\uff0c\u7136\u540e\u7531Leader\u6765\u901a\u8fc7ZooKeeper\u4e2d\u7684\u539f\u5b50\u5e7f\u64ad\u534f\u8bae\uff0c\u5c06\u8bf7\u6c42\u5e7f\u64ad\u7ed9\u6240\u6709\u7684Follower\uff0cLeader\u6536\u5230\u4e00\u534a\u4ee5\u4e0a\u7684\u5199\u6210\u529f\u7684Ack\u540e\uff0c\u5c31\u8ba4\u4e3a\u8be5\u5199\u6210\u529f\u4e86\uff0c\u5c31\u4f1a\u5c06\u8be5\u5199\u8fdb\u884c\u6301\u4e45\u5316\uff0c\u5e76\u544a\u8bc9\u5ba2\u6237\u7aef\u5199\u6210\u529f\u4e86\u3002 # \u4ece\u4e0d\u540c\u7684\u670d\u52a1\u5668\u8bfb\u5199 $zoo121 = new Zookeeper(“192.168.80.121:2181”); $zoo122 = new […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-18663","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/18663","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=18663"}],"version-history":[{"count":1,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/18663\/revisions"}],"predecessor-version":[{"id":18665,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/18663\/revisions\/18665"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=18663"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=18663"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=18663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/a>