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Hadoop生态圈-zookeeper的API用法详解

　　　　　　　　　　　　　　　　　　　　Hadoop生态圈-zookeeper的API用法详解

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

版权声明：原创作品，谢绝转载！否则将追究法律责任。

一.测试前准备

1>.开启集群

[yinzhengjie@s101 ~]$ more `which xzk.sh`

#!/bin/bash

#@author :yinzhengjie

#blog:http://www.cnblogs.com/yinzhengjie

#EMAIL:[email protected]

#判断用户是否传参

if [ $# -ne  ];then

    echo "无效参数，用法为: $0  {start|stop|restart|status}"

    exit

fi

#获取用户输入的命令

cmd=$

#定义函数功能

function zookeeperManger(){

    case $cmd in

    start)

        echo "启动服务"

        remoteExecution start

        ;;

    stop)

        echo "停止服务"

        remoteExecution stop

        ;;

    restart)

        echo "重启服务"

        remoteExecution restart

        ;;

    status)

        echo "查看状态"

        remoteExecution status

        ;;

    *)

        echo "无效参数，用法为: $0  {start|stop|restart|status}"

        ;;

    esac

}

#定义执行的命令

function remoteExecution(){

    for (( i= ; i<= ; i++ )) ; do

            tput setaf

            echo ========== s$i zkServer.sh  $ ================

            tput setaf

            ssh s$i  "source /etc/profile ; zkServer.sh $1"

    done

}

#调用函数

zookeeperManger

[yinzhengjie@s101 ~]$

[yinzhengjie@s101 ~]$ xzk.sh start

启动服务

========== s102 zkServer.sh start ================

ZooKeeper JMX enabled by default

Using config: /soft/zk/bin/../conf/zoo.cfg

Starting zookeeper ... STARTED

========== s103 zkServer.sh start ================

ZooKeeper JMX enabled by default

Using config: /soft/zk/bin/../conf/zoo.cfg

Starting zookeeper ... STARTED

========== s104 zkServer.sh start ================

ZooKeeper JMX enabled by default

Using config: /soft/zk/bin/../conf/zoo.cfg

Starting zookeeper ... STARTED

[yinzhengjie@s101 ~]$ xcall.sh jps

============= s101 jps ============

 Jps

命令执行成功

============= s102 jps ============

 Jps

 QuorumPeerMain

命令执行成功

============= s103 jps ============

 Jps

 QuorumPeerMain

命令执行成功

============= s104 jps ============

 Jps

 QuorumPeerMain

命令执行成功

============= s105 jps ============

 Jps

命令执行成功

[yinzhengjie@s101 ~]$

[yinzhengjie@s101 ~]$ xzk.sh start

[yinzhengjie@s101 ~]$ start-dfs.sh

SLF4J: Class path contains multiple SLF4J bindings.

SLF4J: Found binding in [jar:file:/soft/hadoop-2.7./share/hadoop/common/lib/slf4j-log4j12-1.7..jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: Found binding in [jar:file:/soft/apache-hive-2.1.-bin/lib/log4j-slf4j-impl-2.4..jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]

Starting namenodes on [s101 s105]

s101: starting namenode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-namenode-s101.out

s105: starting namenode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-namenode-s105.out

s103: starting datanode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-datanode-s103.out

s102: starting datanode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-datanode-s102.out

s105: starting datanode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-datanode-s105.out

s104: starting datanode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-datanode-s104.out

Starting journal nodes [s102 s103 s104]

s102: starting journalnode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-journalnode-s102.out

s103: starting journalnode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-journalnode-s103.out

s104: starting journalnode, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-journalnode-s104.out

SLF4J: Class path contains multiple SLF4J bindings.

SLF4J: Found binding in [jar:file:/soft/hadoop-2.7./share/hadoop/common/lib/slf4j-log4j12-1.7..jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: Found binding in [jar:file:/soft/apache-hive-2.1.-bin/lib/log4j-slf4j-impl-2.4..jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]

Starting ZK Failover Controllers on NN hosts [s101 s105]

s101: starting zkfc, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-zkfc-s101.out

s105: starting zkfc, logging to /soft/hadoop-2.7./logs/hadoop-yinzhengjie-zkfc-s105.out

[yinzhengjie@s101 ~]$

[yinzhengjie@s101 ~]$ xcall.sh jps

============= s101 jps ============

Jps

DFSZKFailoverController

命令执行成功

============= s102 jps ============

Jps

DataNode

QuorumPeerMain

JournalNode

命令执行成功

============= s103 jps ============

DataNode

JournalNode

Jps

QuorumPeerMain

命令执行成功

============= s104 jps ============

JournalNode

Jps

DataNode

QuorumPeerMain

命令执行成功

============= s105 jps ============

DFSZKFailoverController

DataNode

Jps

命令执行成功

[yinzhengjie@s101 ~]$

[yinzhengjie@s101 ~]$ start-dfs.sh

2>.添加Maven依赖

 <?xml version="1.0" encoding="UTF-8"?>

 <project xmlns="http://maven.apache.org/POM/4.0.0"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

     <modelVersion>4.0.0</modelVersion>

     <groupId>cn.org.yinzhengjie</groupId>

     <artifactId>MyZookeep</artifactId>

     <version>1.0-SNAPSHOT</version>

     <dependencies>

         <dependency>

             <groupId>junit</groupId>

             <artifactId>junit</artifactId>

             <version>4.12</version>

         </dependency>

         <dependency>

             <groupId>org.apache.zookeeper</groupId>

             <artifactId>zookeeper</artifactId>

             <version>3.4.6</version>

         </dependency>

     </dependencies>

 </project>

二.Zookeeper的API常用方法介绍

1>.测试ls命令

 /*

 @author :yinzhengjie

 Blog:http://www.cnblogs.com/yinzhengjie/tag/Hadoop%E7%94%9F%E6%80%81%E5%9C%88/

 EMAIL:[email protected]

 */

 package cn.org.yinzhengjie.zookeeper;

 import org.apache.zookeeper.ZooKeeper;

 import org.junit.Test;

 import java.util.List;

 public class ZookeeperDemo {

     /**

      * 测试ls

      */

     @Test

     public void testList() throws Exception {

         //定义连接服务器的URL，这些主机都在“C:\Windows\System32\drivers\etc\HOSTS”中做的有映射哟！

         String conn = "s102:2181,s103:2181,s104:2181";

         //实例化zk对象

         //参数一：连接串，指定zk客户端地址；参数二：超时时间，超过此时间未获得连接，抛出异常；参数三：指定watcher对象，我们指定为null即可

         ZooKeeper zk = new ZooKeeper(conn, 5000, null);

         //我们查看“/”节点下的数据

         List<String> children = zk.getChildren("/", null);

         //将查询的结果进行遍历

         for (String child : children) {

             System.out.println(child);

         }

     }

 }

　　以上代码输出结果如下：

Hadoop生态圈-zookeeper的API用法详解-LMLPHP

2>.获取数据

 /*

 @author :yinzhengjie

 Blog:http://www.cnblogs.com/yinzhengjie/tag/Hadoop%E7%94%9F%E6%80%81%E5%9C%88/

 EMAIL:[email protected]

 */

 package cn.org.yinzhengjie.zookeeper;

 import org.apache.zookeeper.ZooKeeper;

 import org.junit.Test;

 public class ZookeeperDemo {

     /**

      * 获取数据

      */

     @Test

     public void testGet() throws Exception {

         //定义连接服务器的URL，这些主机都在“C:\Windows\System32\drivers\etc\HOSTS”中做的有映射哟！

         String conn = "s102:2181,s103:2181,s104:2181";

         //实例化zk对象

         //参数一：连接串，指定zk客户端地址；参数二：超时时间，超过此时间未获得连接，抛出异常；参数三：指定watcher对象，我们指定为null即可

         ZooKeeper zk = new ZooKeeper(conn, 5000, null);

         byte[] data = zk.getData("/a", null, null);

         zk.close();

         System.out.println(new String(data));

     }

 }

　　以上代码输出结果如下：

Hadoop生态圈-zookeeper的API用法详解-LMLPHP

3>.创建节点+数据

 /*

 @author :yinzhengjie

 Blog:http://www.cnblogs.com/yinzhengjie/tag/Hadoop%E7%94%9F%E6%80%81%E5%9C%88/

 EMAIL:[email protected]

 */

 package cn.org.yinzhengjie.zookeeper;

 import org.apache.zookeeper.CreateMode;

 import org.apache.zookeeper.ZooDefs;

 import org.apache.zookeeper.ZooKeeper;

 import org.junit.Test;

 public class ZookeeperDemo {

     /**

      * 创建节点+数据

      */

     @Test

     public void testCreate() throws Exception {

         //定义连接服务器的URL，这些主机都在“C:\Windows\System32\drivers\etc\HOSTS”中做的有映射哟！

         String conn = "s102:2181,s103:2181,s104:2181";

         //实例化zk对象

         //参数一：连接串，指定zk客户端地址；参数二：超时时间，超过此时间未获得连接，抛出异常；参数三：指定watcher对象，我们指定为null即可

         ZooKeeper zk = new ZooKeeper(conn, 5000, null);

         //创建一个"/yzj"节点(该节点不能再zookeeper集群中存在，否则会抛异常哟)，并起名为“yinzhengjie”(写入的数据)。

         String s = zk.create("/yzj", "yinzhengjie".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

         System.out.println(s);

         zk.close();

     }

 }

　　以上代码输出结果如下：

Hadoop生态圈-zookeeper的API用法详解-LMLPHP

4>.删除节点

 /*

 @author :yinzhengjie

 Blog:http://www.cnblogs.com/yinzhengjie/tag/Hadoop%E7%94%9F%E6%80%81%E5%9C%88/

 EMAIL:[email protected]

 */

 package cn.org.yinzhengjie.zookeeper;

 import org.apache.zookeeper.ZooKeeper;

 import org.junit.Test;

 public class ZookeeperDemo {

     /**

      * 删除节点

      */

     @Test

     public void testDelete() throws Exception {

         String conn = "s102:2181,s103:2181,s104:2181";

         //实例化zk对象

         //param1：连接串，指定zk客户端地址；param2：超时时间，超过此时间未获得连接，抛出异常

         ZooKeeper zk = new ZooKeeper(conn, 5000, null);

         //删除zookeeper集群中的节点，删除的节点必须存在，如果不存在会抛异常哟（KeeperException$NoNodeException）

         zk.delete("/yzj",-1);

         zk.close();

     }

 }

5>.观察者模式，监控某个子节点小案例

 /*

 @author :yinzhengjie

 Blog:http://www.cnblogs.com/yinzhengjie/tag/Hadoop%E7%94%9F%E6%80%81%E5%9C%88/

 EMAIL:[email protected]

 */

 package cn.org.yinzhengjie.zookeeper;

 import org.apache.zookeeper.WatchedEvent;

 import org.apache.zookeeper.Watcher;

 import org.apache.zookeeper.ZooKeeper;

 import org.junit.Test;

 public class ZookeeperDemo {

     /**

      * 观察者模式

      */

     @Test

     public void testWatch() throws Exception {

         String conn = "s102:2181,s103:2181,s104:2181";

         //实例化zk对象

         //param1：连接串，指定zk客户端地址；param2：超时时间，超过此时间未获得连接，抛出异常

         final ZooKeeper zk = new ZooKeeper(conn, 5000, null);

         /**

          * 通过回调机制，当监听的节点发生改变，会触发此机制，返回watcher中的方法

          *     触发之后，watcher结束

          */

         Watcher w = new Watcher() {

             public void process(WatchedEvent event) {

                 System.out.println(event.getPath()+"出事了: "+ event.getType());

                 try {

                     //用于监控"/a"节点下数据是否发生变化

                     zk.getChildren("/a", this, null);

                 } catch (Exception e) {

                     e.printStackTrace();

                 }

             }

         };

         zk.getChildren("/a", w, null);

         for ( ; ;){

             Thread.sleep(1000);

         }

     }

 }

　　以上代码执行结果如下：

Hadoop生态圈-zookeeper的API用法详解-LMLPHP

6>.

05-08 08:00
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