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。
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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
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