（六）hadoop系列之__hadoop分布式集群环境搭建

雨点打透心脏的1/2处 2021-12-22 10:11 295阅读 0赞

配置hadoop(master,slave1,slave2)
      说明：
      	NameNode: master
      	DataNode: slave1,slave2
    
      --------------------------------------------------------
       A. 修改主机的master 和 slaves		
          i. 配置slaves
             # vi hadoop/conf/slaves
             添加：192.168.126.20
                   192.168.126.30
                   ...节点 ip
                   
                   
           ii. 配置master
             添加：192.168.126.10
                   ...主机 ip
       -------------------------------------------------------- 
                    
       B. 配置master .xml文件
            i. 配置core-site.xml
    		<?xml version="1.0"?>
    		<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
    		
    		<configuration>
    			<property>  
            <name>hadoop.tmp.dir</name>  
            <value>/home/had/hadoop/data</value>  
            <description>A base for other temporary directories.</description>  
    			</property> 
    			<property>
    				<name>fs.default.name</name>
    				<value>hdfs://192.168.126.10:9000</value>
    			</property>
    		</configuration>
    
    	 ii. 配置hdfs-site.xml
    		<?xml version="1.0"?>
    		<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
    		
    		<configuration>
    			<property>
    				<name>dfs.replication</name>
    				<value>3</value>
    				<description>Default block replication.
    					The actual number of replications can be specified when the file is created.
    					The default is used if replication is not specified in create time.
    				</description>
    			</property>
    		</configuration>
    		
    	iii.mapred-site.xml
    		 	<?xml version="1.0"?>
    		 	<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
    			
    			<configuration>
    				<property>
    					<name>mapred.job.tracker</name>
    					<value>192.168.126.10:9001</value>
    				</property>
    			</configuration>
    			
    		-------------------------------------------------------------	
      C. 配置slave1,slave2 （同上）
           i. core-site.xml ii. mapred-site.xml 		
    	 ---------------------------------------------------------------	
    	 	
      D. 配置 master,slave1,slave2的hadoop系统环境
         	$ vi /home/hadoop/.bashrc
        	添加：
    			export HADOOP_HOME=/home/hadoop/hadoop-0.20.2
    			export HADOOP_CONF_DIR=$HADOOP_HOME/conf    
    			export PATH=/home/hadoop/hadoop-0.20.2/bin:$PATH
       ----------------------------------------------------------------

**初始化文件系统**：

![13220601-727d229979fb41368e9f0d3a4eec4956.jpg][]

**注意：有时候会出现以下错误信息**

** *。。。***

*** 11/08/18 17:02:35 INFO ipc.Client: Retrying connect to server: localhost/192.168.126 .10:9000. Already tried 0 time（s）.***

*** Bad connection to FS. command aborted.***

*** 此时需要把根目录下的tmp文件里面的内容删掉，然后重新格式化即可。***

**启动Hadoop：**

![13225049-65b95f463b2d40b6bafc5876b0a24698.jpg][]

**完成后进行测试：**

测试
    						
      $ bin/hadoop fs -put ./README.txt test1
      $ bin/hadoop fs -ls
      Found 1 items
      drwxr-xr-x   - hadoop supergroup          0 2013-07-14 00:51 /user/hadoop/test1
      $hadoop jar hadoop-0.20.2-examples.jar wordcount /user/hadoop/test1/README.txt output1 
    结果出现以下问题

**注：测试过程当中会有一些错误信息。一下是我在安装的过程当中碰到的几个问题。**

1.org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /home/hadoop/hadoop-datastore
    /hadoop-hadoop/mapred/system/job_201307132331_0005. Name node is in safe mode. 关闭安全模式： bin/hadoop dfsadmin -safemode leave 2.org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/test1/README.txt could only be replicated to 0 nodes, instead of 1 情况1. hadoop.tmp.dir 磁盘空间不足。 解决方法： 换个足够空间的磁盘即可。 情况2. 查看防火墙状态 /etc/init.d/iptables status /etc/init.d/iptables stop//关闭所有的防火墙 情况3.先后启动namenode、datanode（我的是这种情况）
    参考文章：http://sjsky.iteye.com/blog/1124545

最后执行界面如下：

查看hdfs运行状态（web）：http://192.168.126.10:50070/dfshealth.jsp

![14021058-2cfa4a7eafff4fdf8fb7a2314f7386d0.jpg][]

查看map-reduce信息（web）：http://192.168.126.10:50030/jobtracker.jsp

![14021516-625e8cce357a4a3ca7430c687e21fd76.jpg][]

整个Hadoop集群搭建结束。

转载于:https://www.cnblogs.com/FCWORLD/p/3188802.html

[13220601-727d229979fb41368e9f0d3a4eec4956.jpg]: /images/20211220/9cd456e238a34d5f92366c8cd97ae9e9.png
[13225049-65b95f463b2d40b6bafc5876b0a24698.jpg]: /images/20211220/0cfbe79699dd4b48ace77ae5e1456dba.png
[14021058-2cfa4a7eafff4fdf8fb7a2314f7386d0.jpg]: /images/20211220/2c26d74b85f4470b85fda5788fbf1ee3.png
[14021516-625e8cce357a4a3ca7430c687e21fd76.jpg]: /images/20211220/97d8a6ef2dde418b91204159bd7cf374.png