hadoop2.7.7 Centos7 完全分布式 配置与问题随记

这里是当初在三个ECS节点上搭建hadoop+ZooKeeper+HBase+solr的主要步骤，文章内容未经过润色，请参考的同学搭配其他博客一同使用，并记得根据实际情况调整相关参数。

0.prepare

jdk，推荐1.8

关闭防火墙

开放ECS安全组

 三台机器之间的免密登陆ssh

ip映射：【question1】hadoop启动时出现报错java.net.BindException: Cannot assign requested address

说明ip映射没有配置正确，正确的方式是在每一个节点上，都执行"内外外"的配置方式，即将本机与本机的内网ip对应，其他机器设置为外网ip

下面的文件要在每个节点上都修改

1. vi /etc/profile

1. vi /etc/profile
/opt/hadoop/hadoop-2.7.7

export HADOOP_HOME=/opt/hadoop/hadoop-2.7.7 
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"
export PATH=.:${JAVA_HOME}/bin:${HADOOP_HOME}/bin:$PATH

#使环境变量生效
souce /etc/profile
#检验
hadoop version

2. vi /.../hadoop-2.7.7/etc/hadoop/core-site.xml

	fs.defaultFS
		hdfs://Gwj:8020
	定义默认的文件系统主机和端口



	io.file.buffer.size
		4096
	流文件的缓冲区为4K



	hadoop.tmp.dir
		file:/opt/hadoop/hadoop-2.7.7/tempdata
	A base for other temporary directories.

3. vi /.../hadoop-2.7.7/etc/hadoop/hdfs-site.xml

    
        dfs.replication
        2
    
	
    
        dfs.namenode.name.dir
        /opt/hadoop/hadoop-2.7.7/dfs/name
    
	
    
        dfs.datanode.data.dir
        /opt/hadoop/hadoop-2.7.7/dfs/data
    

    
        dfs.WEBhdfs.enabled
        true
    
	
    
        
            dfs.webhdfs.enabled
            true
        
        
            dfs.permissions.enabled
            false
        
        
        
    	
        	dfs.Http.address
        	Gwj:50070
    	
	
    	
        	dfs.namenode.secondary.http-address
        	Ssj:50090
    	

4. vi /.../hadoop-2.7.7/etc/hadoop/mapred-site.xml

    
        mapReduce.framework.name
        local
    
    
    
    
        mapreduce.jobhistory.address
        0.0.0.0:10020
    
    
    
    
        mapreduce.jobhistory.webapp.address
        0.0.0.0:19888
    
	

5. vi /.../hadoop-2.7.7/etc/hadoop/yarn-site.xml

	
	
        yarn.resourcemanager.hostname
        Gwj
        指定resourcemanager所在的hostname
	
	
	
        yarn.nodemanager.aux-services
        mapreduce_shuffle
        NodeManager上运行的附属服务。需配置成mapreduce_shuffle，才可运行MapReduce程序 
	

6.vi /.../hadoop-2.7.7/etc/hadoop/slaves

老版本是slaves文件，3.0.3 用 workers 文件代替 slaves 文件

将localhost删掉，加入dataNode节点的主机名
[root@Gwj ~]# cat /opt/hadoop/hadoop-2.7.7/etc/hadoop/slaves 
Ssj
Pyf

7.首次使用进行格式化

hdfs namenode -fORMat

8.启动

/.../hadoop-2.7.7/sbin/start/start-all.sh
	
	hdfs
		/.../hadoop-2.7.7/sbin/start/start-dfs.sh
		
	Yarn
		/.../hadoop-2.7.7/sbin/start/start-yarn.sh
		
#start可替换为stop、status

9.检验

使用jps检验
hadoop
	hdfs
		Master---NameNode (SecondaryNameNode)
		Slave---DataNode
	Yarn
		Master---ResourceManager 
		Slave---NodeManager

或者使用 “Master ip+50070”

---以下的yarn未设置，注意！！！

	
        yarn.resourcemanager.address
        ${yarn.resourcemanager.hostname}:8032
	
	
	
        The address of the scheduler interface.
        yarn.resourcemanager.scheduler.address
        ${yarn.resourcemanager.hostname}:8030
	
	
	
        The http address of the RM web application.
        yarn.resourcemanager.webapp.address
        ${yarn.resourcemanager.hostname}:8088
	
	
	
        The https aDDDress of the RM web application.
        yarn.resourcemanager.webapp.https.address
        ${yarn.resourcemanager.hostname}:8090
	
	
	
        yarn.resourcemanager.resource-tracker.address
        ${yarn.resourcemanager.hostname}:8031
	
	
	
        The address of the RM admin interface.
        yarn.resourcemanager.admin.address
        ${yarn.resourcemanager.hostname}:8033
	
	
	
        yarn.scheduler.maximum-allocation-mb
        2048
        每个节点可用内存,单位MB,默认8182MB，根据阿里云ECS性能配置为2048MB
	

	
        yarn.nodemanager.vmem-pmem-ratio
        2.1
	
	
	
        yarn.nodemanager.resource.memory-mb
        2048
	
	
	
        yarn.nodemanager.vmem-check-enabled
        false