如何使用ACM实现zookeeper依赖服务的透明Failover迁移

Zookeeper是一个分布式协调服务,用于维护配置信息、命名空间和提供分布式同步,在大规模分布式系统中,为了提高系统的可用性和容错性,通常会使用多个Zookeeper节点来提供服务,当某个节点出现故障时,需要将客户端的请求透明地迁移到其他正常的节点上,这就是Zookeeper依赖服务的透明Failover迁移,本文将介绍如何使用ACM(Apache Curator)实现Zookeeper依赖服务的透明Failover迁移。

创新互联坚持“要么做到,要么别承诺”的工作理念,服务领域包括:成都网站设计、成都网站制作、企业官网、英文网站、手机端网站、网站推广等服务,满足客户于互联网时代的秦皇岛网站设计、移动媒体设计的需求,帮助企业找到有效的互联网解决方案。努力成为您成熟可靠的网络建设合作伙伴!

1. 引入ACM依赖

需要在项目的pom.xml文件中引入ACM的依赖:


    org.apache.curator
    curator-framework
    4.3.0


    org.apache.curator
    curator-recipes
    4.3.0

2. 创建Zookeeper客户端工厂

接下来,需要创建一个Zookeeper客户端工厂,用于创建Zookeeper客户端实例:

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;

public class ZookeeperClientFactory {
    private static final String CONNECT_STRING = "127.0.0.1:2181";
    private static final int SESSION_TIMEOUT = 5000;
    private static final int CONNECTION_TIMEOUT = 5000;
    private static final int MAX_RETRIES = 3;

    public static CuratorFramework getClient() {
        CuratorFramework client = CuratorFrameworkFactory.newClient(CONNECT_STRING, new ExponentialBackoffRetry(MAX_RETRIES, 1000));
        client.start();
        client.setSessionTimeoutMs(SESSION_TIMEOUT);
        client.setConnectionTimeoutMs(CONNECTION_TIMEOUT);
        return client;
    }
}

3. 使用ACM实现Zookeeper依赖服务的透明Failover迁移

ACM提供了`InterProcessMutex`类,可以实现分布式锁的功能,通过将Zookeeper节点的路径作为锁的名称,可以实现对Zookeeper节点的访问控制,当某个节点出现故障时,可以通过监听器捕获节点变化事件,实现对客户端请求的透明Failover迁移,以下是一个简单的示例:

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.framework.recipes.locks.InterProcessMutexImpl;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;

public class ZookeeperTransparentFailoverDemo {
    private static final String ZK_NODE_PATH = "/my_zk_node";
    private static final InterProcessMutex lock = new InterProcessMutexImpl(ZookeeperClientFactory.getClient(), ZK_NODE_PATH);

    public static void main(String[] args) throws Exception {
        System.out.println("尝试获取锁...");
        if (lock.acquire()) {
            try {
                System.out.println("获取锁成功,执行业务逻辑...");
                // 模拟业务逻辑处理时间
                Thread.sleep(2000);
            } finally {
                lock.release();
                System.out.println("释放锁");
            }
        } else {
            System.out.println("获取锁失败,等待重试...");
        }
    }
}

4. 添加Zookeeper节点变化监听器

为了实现对客户端请求的透明Failover迁移,需要添加一个Zookeeper节点变化监听器,当监听到指定节点发生变化时,重新创建一个新的Zookeeper客户端实例,并更新全局的客户端实例,以下是一个简单的示例:

“`java

import org.apache.curator.framework.CuratorFramework;

import org.apache.curator.framework.CuratorFrameworkFactory;

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

import org.apache.curator.framework.state.*;

import org.apache.curator.retry.*;

import org.apache.zookeeper.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.concurrent.atomic.*;

import javafx.*; // for JavaFX application only! See -Support for more info on this example and how to run it locally without JavaFX support in your environment! :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i -i

名称栏目:如何使用ACM实现zookeeper依赖服务的透明Failover迁移
标题网址:http://www.36103.cn/qtweb/news10/18110.html

网站建设、网络推广公司-创新互联,是专注品牌与效果的网站制作,网络营销seo公司;服务项目有等

广告

声明:本网站发布的内容(图片、视频和文字)以用户投稿、用户转载内容为主,如果涉及侵权请尽快告知,我们将会在第一时间删除。文章观点不代表本网站立场,如需处理请联系客服。电话:028-86922220;邮箱:631063699@qq.com。内容未经允许不得转载,或转载时需注明来源: 创新互联