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Nodecache(nodecache跑路)

2023-07-31 分类：文章聚合 阅读(27) 评论(0)

本文目录：

  • 1、配置mycat-eye，怎么页面提示注册zookeeper
  • 2、curator里面的NodeCache监听节点，怎么获取触发事件
  • 3、如何使用Cruator监听zookeeper事件变化
  • 4、Curator简介
  • 5、如何使用cruator监听zookeeper事件变化
  • 6、dubbo使用zookeeper连接，zookeeper宕机后怎么处理？

配置mycat-eye，怎么页面提示注册zookeeper

1，配置文件同步2，主从切换3，分布式队列4，分布式锁5，其他在以前的文章里面有写过使用zookeeper原生的api，监听zk节点变化，那么本篇我们就来看下，如何使用curator来完成监听，代码如下：packagecom.qin.curator.zk;importjavax.sound.midi.Patch;importorg.apache.curator.RetryPolicy;importorg.apache.curator.framework.CuratorFramework;importorg.apache.curator.framework.CuratorFrameworkFactory;importorg.apache.curator.framework.CuratorFrameworkFactory.Builder;importorg.apache.curator.framework.api.CuratorWatcher;importorg.apache.curator.framework.recipes.cache.NodeCache;importorg.apache.curator.framework.recipes.cache.NodeCacheListener;importorg.apache.curator.framework.recipes.cache.PathChildrenCache;importorg.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;importorg.apache.curator.framework.recipes.cache.PathChildrenCacheListener;importorg.apache.curator.retry.ExponentialBackoffRetry;importorg.apache.curator.utils.ZKPaths;importorg.apache.zookeeper.WatchedEvent;/****使用curator监听zookeeper节点*@authorqindongliang***/publicclassCuratorWatch{staticCuratorFrameworkzkclient=null;staticStringnameSpace="php";static{Stringzkhost="192.168.46.22:2181";//zk的hostRetryPolicyrp=newExponentialBackoffRetry(1000,3);//重试机制Builderbuilder=CuratorFrameworkFactory.builder().connectString(zkhost).connectionTimeoutMs(5000).sessionTimeoutMs(5000).retryPolicy(rp);builder.namespace(nameSpace);CuratorFrameworkzclient=builder.build();zkclient=zclient;zkclient.start();//放在这前面执行zkclient.newNamespaceAwareEnsurePath(nameSpace);}publicstaticvoidmain(String[]args)throwsException{watch();Thread.sleep(Long.MAX_VALUE);}/****监听节点变化***/publicstaticvoidwatch()throwsException{PathChildrenCachecache=newPathChildrenCache(zkclient,"/zk",false);cache.start();System.out.println("监听开始/zk..");PathChildrenCacheListenerplis=newPathChildrenCacheListener(){@OverridepublicvoidchildEvent(CuratorFrameworkclient,PathChildrenCacheEventevent)throwsException{switch(event.getType()){caseCHILD_ADDED:{System.out.println("Nodeadded:"+ZKPaths.getNodeFromPath(event.getData().getPath()));break;}caseCHILD_UPDATED:{System.out.println("Nodechanged:"+ZKPaths.getNodeFromPath(event.getData().getPath()));break;}caseCHILD_REMOVED:{System.out.println("Noderemoved:"+ZKPaths.getNodeFromPath(event.getData().getPath()));break;}}}};//注册监听cache.getListenable().addListener(plis);}}运行后的控制台打印：18:33:07.722[main]INFOo.a.c.f.imps.CuratorFrameworkImpl-Starting18:33:07.727[main]DEBUGo.a.curator.CuratorZookeeperClient-Starting18:33:07.727[main]DEBUGorg.apache.curator.ConnectionState-Starting18:33:07.727[main]DEBUGorg.apache.curator.ConnectionState-reset18:33:07.734[main]INFOorg.apache.zookeeper.ZooKeeper-Clientenvironment:zookeeper.version=3.4.6-1569965,builton02/20/201409:09GMT18:33:07.734[main]INFOorg.apache.zookeeper.ZooKeeper-Clientenvironment:host.name=QINDONGLIANG.dhgatecn.msf18:33:07.734[main]INFOorg.apache.zookeeper.ZooKeeper-Clientenvironment:java.version=1.7.0_0418:33:07.734[main]INFOorg.apache.zookeeper.ZooKeeper-Clientenvironment:java.vendor=OracleCorporation18:33:07.734[main]INFOorg.apache.zookeeper.ZooKeeper-Clientenvironment:java.home=D:\Java\jdk1.7.0_04\jre18:33:07.734[main]INFOorg.apache.zookeeper.ZooKeeper-Clientenvironment:java.class.path=D:\eclipseworkspace2yw\opzk\bin;D:\eclipseworkspace2yw\opzk\lib\curator-client-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-examples-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-framework-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-recipes-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-test-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-server-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-rpc-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\log4j-1.2.15.jar;D:\eclipseworkspace2yw\opzk\lib\zookeeper-3.4.5.jar;D:\eclipseworkspace2yw\opzk\lib\commons-io-2.1.jar

curator里面的NodeCache监听节点，怎么获取触发事件

判断节点是新增、修改还是删除应该通过PathChildrenCache来处理，PathChildrenCacheListener有event参数，

NodeCache和NodeCacheListener是监听节点内容变更的，直接通过cn.getCurrentData().data()可以获得节点最新内容

如何使用Cruator监听zookeeper事件变化

您好，掌握zookeeper事件监听机制，非常重要，可以说是跨入了进阶的门槛，只有掌握了如何监听某个节点或路径，我们才能在节点变化后，做一些我们想做的事，包括：

1，配置文件同步

2，主从切换

3，分布式队列

4，分布式锁

5，其他

散仙，在以前的文章里面有写过使用zookeeper原生的api，监听zk节点变化，那么本篇我们就来看下，如何使用curator来完成监听，代码如下：

pre name="code" class="cha-b930-3acb-c789-70de java"package com.qin.curator.zk;

import javax.sound.midi.Patch;

import org.apache.curator.RetryPolicy;

import org.apache.curator.framework.CuratorFramework;

import org.apache.curator.framework.CuratorFrameworkFactory;

import org.apache.curator.framework.CuratorFrameworkFactory.Builder;

import org.apache.curator.framework.api.CuratorWatcher;

import org.apache.curator.framework.recipes.cache.NodeCache;

import org.apache.curator.framework.recipes.cache.NodeCacheListener;

import org.apache.curator.framework.recipes.cache.PathChildrenCache;

import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;

import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;

import org.apache.curator.retry.ExponentialBackoffRetry;

import org.apache.curator.utils.ZKPaths;

import org.apache.zookeeper.WatchedEvent;

/**

*

* 使用curator监听zookeeper节点

* @author qindongliang

* **/

public class CuratorWatch {

static CuratorFramework zkclient=null;

static String nameSpace="php";

static {

String zkhost="192.168.46.22:2181";//zk的host

RetryPolicy rp=new ExponentialBackoffRetry(1000, 3);//重试机制

Builder builder = CuratorFrameworkFactory.builder().connectString(zkhost)

.connectionTimeoutMs(5000)

.sessionTimeoutMs(5000)

.retryPolicy(rp);

builder.namespace(nameSpace);

CuratorFramework zclient = builder.build();

zkclient=zclient;

zkclient.start();// 放在这前面执行

zkclient.newNamespaceAwareEnsurePath(nameSpace);

}

public static void main(String[] args) throws Exception{

watch();

Thread.sleep(Long.MAX_VALUE);

}

/**

*

* 监听节点变化

*

* */

public static void watch()throws Exception{

PathChildrenCache cache = new PathChildrenCache(zkclient, "/zk", false);

cache.start();

System.out.println("监听开始/zk........");

PathChildrenCacheListener plis=new PathChildrenCacheListener() {

@Override

public void childEvent(CuratorFramework client, PathChildrenCacheEvent event)

throws Exception {

switch ( event.getType() )

{

case CHILD_ADDED:

{

System.out.println("Node added: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

break;

}

case CHILD_UPDATED:

{

System.out.println("Node changed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

break;

}

case CHILD_REMOVED:

{

System.out.println("Node removed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

break;

}

}

}

};

//注册监听

cache.getListenable().addListener(plis);

}

}

/pre

运行后的控制台打印：

pre name="code" class="cha-3acb-c789-70de-c9c6 java"18:33:07.722 [main] INFO o.a.c.f.imps.CuratorFrameworkImpl - Starting

18:33:07.727 [main] DEBUG o.a.curator.CuratorZookeeperClient - Starting

18:33:07.727 [main] DEBUG org.apache.curator.ConnectionState - Starting

18:33:07.727 [main] DEBUG org.apache.curator.ConnectionState - reset

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:host.name=QINDONGLIANG.dhgatecn.msf

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.version=1.7.0_04

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.vendor=Oracle Corporation

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.home=D:\Java\jdk1.7.0_04\jre

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.class.path=D:\eclipseworkspace2yw\opzk\bin;D:\eclipseworkspace2yw\opzk\lib\curator-client-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-examples-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-framework-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-recipes-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-test-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-server-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-rpc-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\log4j-1.2.15.jar;D:\eclipseworkspace2yw\opzk\lib\zookeeper-3.4.5.jar;D:\eclipseworkspace2yw\opzk\lib\commons-io-2.1.jar

Curator简介

一、Curator是NetFlix公司开源的一套Zookeeper客户端框架，其特点如下：

1、连接重连

2、反复注册Watcher

3、NodeExistsException处理

二、常用API

API文档对应地址：

RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);//Zookeeper每1秒检查一次session状态，如果断掉的话，重新连接，如果连续3次均没连上，则session失效

CuratorFramework client = CuratorFrameworkFactory.newClient(connectingString,sessionTimeout,connectionTimeOut,retryPolicy);

//创建节点

client.create().forPath(path);

//创建节点并设置值

client.create().forPath(path,"init".getBytes());

//创建临时节点

client.create().withMode(CreateMode.EPHEMERAL).forPath(path);

//创建临时节点并递归创建父节点

client.create().creatingParentContainersIfNeeded().withMode(CreateMode.EPHEMERAL).forPath(path);

//删除节点

client.delete().forPath(path);

//删除节点并递归删除其所有子节点

client.delete().deletingChildrenIfNeeded().forPath(path);

//删除节点，强制指定版本进行删除

client.delete().withVersion(version).forPath(path);

//强制保证删除

client.delete().guaranteed().forPath(path);

//获取某个节点数据

client.getData().forPath(path);

//读取一个节点的数据内容，同时按获取到该节点的stat

Stat stat = new Stat();

client.getData().storingStatIn(stat).forPath(path);

//更新一个节点的数据内容

client.setData().withVersion(version).forPath(path);

//异步

client.create().creatingParentsIfNeeded().inBackground(new BackgroundCallback() {

    @Override

    public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {

    }

}).forPath(path,"init".getBytes());

三、监听器

1、NodeCache:监听节点变化

NodeCache cache = new NodeCache(client,path,false);

cache.start(true); //第一次启动的时候就会从Zookeeper上同步数据

cache.getListenable().addListener(new NodeCacheListener() {

@Override

public void nodeChanged() throws Exception {

  System.out.println(cache.getCurrentData().getData());

}

});

2、PathChildrenCache:监控某个节点子节点的变化【无法对父节点以及二级节点数据进行监控】

PathChildrenCache childrenCache = new PathChildrenCache(client,path,true);

childrenCache.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);

childrenCache.getListenable().addListener(new PathChildrenCacheListener() {

@Override

public void childEvent(CuratorFramework curatorFramework, PathChildrenCacheEvent pathChildrenCacheEvent) throws Exception {

  System.out.println("节点变更类型："+pathChildrenCacheEvent.getType()+"对应节点："+pathChildrenCacheEvent.getData().getPath());

}

});

四、LeaderLatch

LeaderLatch⽤于实现Leader的选举

– 触发方法isLeader()，表示成为leader

– 触发notLeader()，表示失去leader权限

– 场景：参考xxx-callback

public void afterPropertiesSet() throws Exception {

if (leaderLatch != null) {

  return;

}

leaderLatch = new LeaderLatch(curatorClient,//zk客户端实例

  PATH,//选举根节点路径

  OSUtils.getServerIp() + "_" + UUID.randomUUID().toString()); //客户端ID，用来标记客户端，即客户端编号，名称

leaderLatch.addListener(new LeaderLatchListener() {

  @Override

  public void isLeader() { //抢主成功时触发

  ContextHolder.setLeader(true);

  LOGGER.info("im leader");

  }

  @Override

  public void notLeader() { //抢主失败时触发

  ContextHolder.setLeader(false);

  LOGGER.info("im not leader");

  }

});

leaderLatch.start();

}

五、分布式锁

1、模拟并发

CountDownLatch countDownLatch = new CountDownLatch(1);

for (int i=0;i10;i++){

new Thread(new Runnable() {

  @Override

  public void run() {

  try {

    countDownLatch.await();

  }catch (Exception e){

  }

  System.out.println(System.currentTimeMillis());

  }

}).start();

}

countDownLatch.countDown();

2、分布式锁控制

client.start();

String lock_path = "/lock";

final InterProcessMutex lock = new InterProcessMutex(client,lock_path);

CountDownLatch countDownLatch = new CountDownLatch(1);

for (int i=0;i10;i++){

new Thread(new Runnable() {

  @Override

  public void run() {

  try {

    countDownLatch.await();

    lock.acquire();

  }catch (Exception e){

  }

  System.out.println(System.currentTimeMillis());

  try {

    lock.release();

  } catch (Exception e) {

    e.printStackTrace();

  }

  }

}).start();

}

countDownLatch.countDown();

六、分布式计数器

DistributedAtomicInteger atomicInteger = new DistributedAtomicInteger(client,path,new RetryNTimes(1000,3));

atomicInteger.add(8);

思考：

1、开关同步采用Zookeeper是否可以 ？

2、ABTest？

3、分批任务计算？

4、配置中心

如何使用cruator监听zookeeper事件变化

掌握zookeeper事件监听机制，非常重要，可以说是跨入了进阶的门槛，只有掌握了如何监听某个节点或路径，我们才能在节点变化后，做一些我们想做的事，包括：

1，配置文件同步

2，主从切换

3，分布式队列

4，分布式锁

5，其他

散仙，在以前的文章里面有写过使用zookeeper原生的api，监听zk节点变化，那么本篇我们就来看下，如何使用curator来完成监听，代码如下：

pre name="code" class="cha-c789-70de-c9c6-9e72 java"package com.qin.curator.zk;

import javax.sound.midi.Patch;

import org.apache.curator.RetryPolicy;

import org.apache.curator.framework.CuratorFramework;

import org.apache.curator.framework.CuratorFrameworkFactory;

import org.apache.curator.framework.CuratorFrameworkFactory.Builder;

import org.apache.curator.framework.api.CuratorWatcher;

import org.apache.curator.framework.recipes.cache.NodeCache;

import org.apache.curator.framework.recipes.cache.NodeCacheListener;

import org.apache.curator.framework.recipes.cache.PathChildrenCache;

import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;

import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;

import org.apache.curator.retry.ExponentialBackoffRetry;

import org.apache.curator.utils.ZKPaths;

import org.apache.zookeeper.WatchedEvent;

/**

*

* 使用curator监听zookeeper节点

* @author qindongliang

* **/

public class CuratorWatch {

static CuratorFramework zkclient=null;

static String nameSpace="php";

static {

String zkhost="192.168.46.22:2181";//zk的host

RetryPolicy rp=new ExponentialBackoffRetry(1000, 3);//重试机制

Builder builder = CuratorFrameworkFactory.builder().connectString(zkhost)

.connectionTimeoutMs(5000)

.sessionTimeoutMs(5000)

.retryPolicy(rp);

builder.namespace(nameSpace);

CuratorFramework zclient = builder.build();

zkclient=zclient;

zkclient.start();// 放在这前面执行

zkclient.newNamespaceAwareEnsurePath(nameSpace);

}

public static void main(String[] args) throws Exception{

watch();

Thread.sleep(Long.MAX_VALUE);

}

/**

*

* 监听节点变化

*

* */

public static void watch()throws Exception{

PathChildrenCache cache = new PathChildrenCache(zkclient, "/zk", false);

cache.start();

System.out.println("监听开始/zk........");

PathChildrenCacheListener plis=new PathChildrenCacheListener() {

@Override

public void childEvent(CuratorFramework client, PathChildrenCacheEvent event)

throws Exception {

switch ( event.getType() )

{

case CHILD_ADDED:

{

System.out.println("Node added: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

break;

}

case CHILD_UPDATED:

{

System.out.println("Node changed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

break;

}

case CHILD_REMOVED:

{

System.out.println("Node removed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

break;

}

}

}

};

//注册监听

cache.getListenable().addListener(plis);

}

}

/pre

运行后的控制台打印：

pre name="code" class="cha-0ea8-feb0-6be8-a035 java"18:33:07.722 [main] INFO o.a.c.f.imps.CuratorFrameworkImpl - Starting

18:33:07.727 [main] DEBUG o.a.curator.CuratorZookeeperClient - Starting

18:33:07.727 [main] DEBUG org.apache.curator.ConnectionState - Starting

18:33:07.727 [main] DEBUG org.apache.curator.ConnectionState - reset

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:host.name=QINDONGLIANG.dhgatecn.msf

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.version=1.7.0_04

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.vendor=Oracle Corporation

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.home=D:\Java\jdk1.7.0_04\jre

18:33:07.734 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.class.path=D:\eclipseworkspace2yw\opzk\bin;D:\eclipseworkspace2yw\opzk\lib\curator-client-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-examples-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-framework-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-recipes-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-test-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-server-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-rpc-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\log4j-1.2.15.jar;D:\eclipseworkspace2yw\opzk\lib\zookeeper-3.4.5.jar;D:\eclipseworkspace2yw\opzk\lib\commons-io-2.1.jar

dubbo使用zookeeper连接，zookeeper宕机后怎么处理？

1、配置文件同步

2、主从切换

3、分布式队列

4、分布式锁

Zookeeper 作为一个分布式的服务框架，主要用来解决分布式集群中应用系统的一致性问题，它能提供基于类似于文件系统的目录节点树方式的数据存储，但是 Zookeeper 并不是用来专门存储数据的，它的作用主要是用来维护和监控你存储的数据的状态变化。

通过监控这些数据状态的变化，从而可以达到基于数据的集群管理，后面将会详细介绍 Zookeeper 能够解决的一些典型问题，这里先介绍一下，Zookeeper 的操作接口和简单使用示例。

常用接口列表

客户端要连接 Zookeeper 服务器可以通过创建 org.apache.zookeeper. ZooKeeper 的一个实例对象，然后调用这个类提供的接口来和服务器交互。

前面说了 ZooKeeper 主要是用来维护和监控一个目录节点树中存储的数据的状态，所有我们能够操作 ZooKeeper 的也和操作目录节点树大体一样，如创建一个目录节点，给某个目录节点设置数据，获取某个目录节点的所有子目录节点，给某个目录节点设置权限和监控这个目录节点的状态变化。

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