Zookeeper学习心得

本人学zookeeper时按照此文路线学的

Zookeeper学习大纲 - 似懂非懂视为不懂 - 博客园

一、Zookeeper安装

ZooKeeper 入门教程 - Java陈序员 - 博客园 

Docker安装Zookeeper教程（超详细）_docker 安装zk-CSDN博客

二、 zookeeper的数据模型

ZooKeeper 入门教程 - Java陈序员 - 博客园 

三、使用zookeeper的一些API实现增删改查

Apache ZooKeeper的使用：

原链接找不到是哪个来着了，附上我学习用的代码

依赖

		<dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.4.6</version></dependency>

代码示例：

/*** 配置zookeeper* yml配置：*  zookeeper:*      server: 192.168.1.198:2181*      timeout: 3000*/
@Configuration
public class ZookeeperConfig {@Value("${zookeeper.server}")private String server;@Value("${zookeeper.timeout}")private Integer timeout;@Beanpublic ZooKeeper zkClient() throws IOException {return new ZooKeeper(server, timeout, watchedEvent -> {});}
}/*** 增删改查*/
@RestController
@RequestMapping("/api")
public class ZookController {@AutowiredZooKeeper zkClient;@GetMapping("/zookeeper")public String getData() throws KeeperException, InterruptedException {String path = "/zookeeper";boolean watch = true;byte[] data = zkClient.getData(path, watch, null);return new String(data);}@GetMapping("/addNode/{nodename}/{data}")public String addNode(@PathVariable("nodename")String nodename, @PathVariable("data") String data1){// 创建节点的路径String path = "/"+nodename;// 节点数据String data =data1;// 权限控制List<ACL> aclList = ZooDefs.Ids.OPEN_ACL_UNSAFE;// 创建节点的类型CreateMode createMode = CreateMode.PERSISTENT;String result = null;try {result = zkClient.create(path, data.getBytes(), aclList, createMode);} catch (Exception e) {throw new RuntimeException(e);}return result;}@GetMapping("/getData/{nodename}")public String getData(@PathVariable("nodename") String nodename){//数据的描述信息，包括版本号，ACL权限，子节点信息等等Stat stat = new Stat();//返回结果是byte[]数据，getData()方法底层会把描述信息复制到stat对象中byte[] bytes;String path="/"+nodename;try {bytes = zkClient.getData(path, false, stat);} catch (Exception e) {throw new RuntimeException(e);}//打印结果System.out.println("ZNode的数据data:" + new String(bytes));//Hello WorldSystem.out.println("获取到dataVersion版本号:" + stat.getVersion());//默认数据版本号是0return new String(bytes);}@GetMapping("/setData/{nodename}/{data}")public String setData(@PathVariable("nodename")String nodename, @PathVariable("data") String data1) throws InterruptedException, KeeperException {String path = "/"+nodename;zkClient.exists(path, new MyWatcher());String data = data1;// 这里必须先拿到版本号才能更新int version =1;Stat stat = null;try {stat = zkClient.setData(path, data.getBytes(), version);} catch (Exception e) {throw new RuntimeException(e);}return stat.toString();}@GetMapping("/deleteNode/{nodename}")public String deleteNode(@PathVariable("nodename")String nodename){String path = "/"+nodename;int version = 0;try {zkClient.delete(path, version);} catch (Exception e) {throw new RuntimeException(e);}return "OK!";}
}

Curator客户端的使用

ZooKeeper 实战(三) SpringBoot整合Curator-开发使用篇-CSDN博客

四、使用Curator实现分布式锁、分布式id、watch事件监听

ZooKeeper 实战(四) Curator Watch事件监听_curatorwatcher-CSDN博客

ZooKeeper 实战(五) Curator实现分布式锁-CSDN博客 

ZooKeeper 实战(六) - 分布式ID实现方案_分布式id生成方案-CSDN博客

五、学习zookeeper集群

六、学习zookeeper的机制和原理

CAP理论

ZAB协议