建站
咨詢(xún)
售后
建站咨詢(xún)
新聞中心
Zookeeper是一個(gè)分布式協(xié)調(diào)服務(wù)，用于維護(hù)配置信息、命名空間和提供分布式同步，在大規(guī)模分布式系統(tǒng)中，為了提高系統(tǒng)的可用性和容錯(cuò)性，通常會(huì)使用多個(gè)Zookeeper節(jié)點(diǎn)來(lái)提供服務(wù)，當(dāng)某個(gè)節(jié)點(diǎn)出現(xiàn)故障時(shí)，需要將客戶(hù)端的請(qǐng)求透明地遷移到其他正常的節(jié)點(diǎn)上，這就是Zookeeper依賴(lài)服務(wù)的透明Failover遷移，本文將介紹如何使用ACM（Apache Curator）實(shí)現(xiàn)Zookeeper依賴(lài)服務(wù)的透明Failover遷移。
創(chuàng)新互聯(lián)堅(jiān)持“要么做到，要么別承諾”的工作理念，服務(wù)領(lǐng)域包括：成都網(wǎng)站設(shè)計(jì)、成都網(wǎng)站制作、企業(yè)官網(wǎng)、英文網(wǎng)站、手機(jī)端網(wǎng)站、網(wǎng)站推廣等服務(wù)，滿(mǎn)足客戶(hù)于互聯(lián)網(wǎng)時(shí)代的秦皇島網(wǎng)站設(shè)計(jì)、移動(dòng)媒體設(shè)計(jì)的需求，幫助企業(yè)找到有效的互聯(lián)網(wǎng)解決方案。努力成為您成熟可靠的網(wǎng)絡(luò)建設(shè)合作伙伴！
1. 引入ACM依賴(lài)
需要在項(xiàng)目的pom.xml文件中引入ACM的依賴(lài)：
org.apache.curator curator-framework 4.3.0 org.apache.curator curator-recipes 4.3.0
2. 創(chuàng)建Zookeeper客戶(hù)端工廠
接下來(lái)，需要?jiǎng)?chuàng)建一個(gè)Zookeeper客戶(hù)端工廠，用于創(chuàng)建Zookeeper客戶(hù)端實(shí)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實(shí)現(xiàn)Zookeeper依賴(lài)服務(wù)的透明Failover遷移
ACM提供了`InterProcessMutex`類(lèi)，可以實(shí)現(xiàn)分布式鎖的功能，通過(guò)將Zookeeper節(jié)點(diǎn)的路徑作為鎖的名稱(chēng)，可以實(shí)現(xiàn)對(duì)Zookeeper節(jié)點(diǎn)的訪(fǎng)問(wèn)控制，當(dāng)某個(gè)節(jié)點(diǎn)出現(xiàn)故障時(shí)，可以通過(guò)監(jiān)聽(tīng)器捕獲節(jié)點(diǎn)變化事件，實(shí)現(xiàn)對(duì)客戶(hù)端請(qǐng)求的透明Failover遷移，以下是一個(gè)簡(jiǎn)單的示例：
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("嘗試獲取鎖...");
if (lock.acquire()) {
try {
System.out.println("獲取鎖成功，執(zhí)行業(yè)務(wù)邏輯...");
// 模擬業(yè)務(wù)邏輯處理時(shí)間
Thread.sleep(2000);
} finally {
lock.release();
System.out.println("釋放鎖");
}
} else {
System.out.println("獲取鎖失敗，等待重試...");
}
}
}
4. 添加Zookeeper節(jié)點(diǎn)變化監(jiān)聽(tīng)器
為了實(shí)現(xiàn)對(duì)客戶(hù)端請(qǐng)求的透明Failover遷移，需要添加一個(gè)Zookeeper節(jié)點(diǎn)變化監(jiān)聽(tīng)器，當(dāng)監(jiān)聽(tīng)到指定節(jié)點(diǎn)發(fā)生變化時(shí)，重新創(chuàng)建一個(gè)新的Zookeeper客戶(hù)端實(shí)例，并更新全局的客戶(hù)端實(shí)例，以下是一個(gè)簡(jiǎn)單的示例：
“`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
分享名稱(chēng)：如何使用ACM實(shí)現(xiàn)zookeeper依賴(lài)服務(wù)的透明Failover遷移
文章網(wǎng)址：http://m.5511xx.com/article/dhiiehc.html
