CDH版本Hadoop 伪分布式环境搭建

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服务规划

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步骤

• 第一步：上传压缩包并解压

cd /export/softwares/

tar -zxvf hadoop-2.6.0-cdh5.14.0.tar.gz -C ../servers/

• 第二步：查看Hadoop支持的压缩方式以及本地库

cd /export/servers/hadoop-2.6.0-cdh5.14.0

bin/hadoop checknative

在第一台机执行,如果出现openssl为false，执行

yum -y install openssl-devel

• 第三步：修改配置文件

修改core-site.xml

cd /export/servers/hadoop-2.6.0-cdh5.14.0/etc/hadoop

<configuration>

	<property>

		<name>fs.defaultFS</name>

		<value>hdfs://node01:8020</value>

	</property>

	<property>

		<name>hadoop.tmp.dir</name>

		<value>/export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/tempDatas</value>

	</property>

	<!--  缓冲区大小，实际工作中根据服务器性能动态调整 -->

	<property>

		<name>io.file.buffer.size</name>

		<value>4096</value>

	</property>

	<!--  开启hdfs的垃圾桶机制，删除掉的数据可以从垃圾桶中回收，单位分钟 -->

	<property>

		<name>fs.trash.interval</name>

		<value>10080</value>

	</property>

</configuration>

修改hdfs-site.xml

<configuration>

	<!-- NameNode存储元数据信息的路径，实际工作中，一般先确定磁盘的挂载目录，然后多个目录用，进行分割   -->

	<!--   集群动态上下线

	<property>

		<name>dfs.hosts</name>

		<value>/export/servers/hadoop-2.6.0-cdh5.14.0/etc/hadoop/accept_host</value>

	</property>

	<property>

		<name>dfs.hosts.exclude</name>

		<value>/export/servers/hadoop-2.6.0-cdh5.14.0/etc/hadoop/deny_host</value>

	</property>

	 -->

	 <property>

			<name>dfs.namenode.secondary.http-address</name>

			<value>node01:50090</value>

	</property>

	<property>

		<name>dfs.namenode.http-address</name>

		<value>node01:50070</value>

	</property>

	<property>

		<name>dfs.namenode.name.dir</name>

		<value>file:///export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/namenodeDatas</value>

	</property>

	<!--  定义dataNode数据存储的节点位置，实际工作中，一般先确定磁盘的挂载目录，然后多个目录用，进行分割  -->

	<property>

		<name>dfs.datanode.data.dir</name>

		<value>file:///export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/datanodeDatas</value>

	</property>

	<property>

		<name>dfs.namenode.edits.dir</name>

		<value>file:///export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/dfs/nn/edits</value>

	</property>

	<property>

		<name>dfs.namenode.checkpoint.dir</name>

		<value>file:///export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/dfs/snn/name</value>

	</property>

	<property>

		<name>dfs.namenode.checkpoint.edits.dir</name>

		<value>file:///export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/dfs/nn/snn/edits</value>

	</property>

	<property>

		<name>dfs.replication</name>

		<value>2</value>

	</property>

	<property>

		<name>dfs.permissions</name>

		<value>false</value>

	</property>

<property>

		<name>dfs.blocksize</name>

		<value>134217728</value>

	</property>

</configuration>

修改hadoop-env.sh

export JAVA_HOME=/export/servers/jdk1.8.0_141

修改mapred-site.xml

<configuration>

	<property>

		<name>mapreduce.framework.name</name>

		<value>yarn</value>

	</property>

	<property>

		<name>mapreduce.job.ubertask.enable</name>

		<value>true</value>

	</property>

	<property>

		<name>mapreduce.jobhistory.address</name>

		<value>node01:10020</value>

	</property>

	<property>

		<name>mapreduce.jobhistory.webapp.address</name>

		<value>node01:19888</value>

	</property>

</configuration>

修改yarn-site.xml

<configuration>

	<property>

		<name>yarn.resourcemanager.hostname</name>

		<value>node01</value>

	</property>

	<property>

		<name>yarn.nodemanager.aux-services</name>

		<value>mapreduce_shuffle</value>

	</property>

	<property>

		<name>yarn.log-aggregation-enable</name>

		<value>true</value>

	</property>

	<property>

		<name>yarn.log-aggregation.retain-seconds</name>

		<value>604800</value>

	</property>

</configuration>

修改slaves

node02

node03

• 第四步：创建文件存放目录
  
  第一台机器执行

mkdir -p /export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/tempDatas

mkdir -p /export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/namenodeDatas

mkdir -p /export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/datanodeDatas

mkdir -p /export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/dfs/nn/edits

mkdir -p /export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/dfs/snn/name

mkdir -p /export/servers/hadoop-2.6.0-cdh5.14.0/hadoopDatas/dfs/nn/snn/edits

• 第五步：安装包的分发

cd /export/servers/

scp -r hadoop-2.6.0-cdh5.14.0/ node02:$PWD

scp -r hadoop-2.6.0-cdh5.14.0/ node03:$PWD

• 第六步：配置Hadoop的环境变量
  
  三台机器都执行

vim /etc/profile

添加

export HADOOP_HOME=/export/servers/hadoop-2.6.0-cdh5.14.0

export PATH=:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$PATH

让配置生效

source /etc/profile

• 第七步：启动集群

启动前先格式化NameNode

cd /export/servers/hadoop-2.6.0-cdh5.14.0

bin/hdfs namenode -format	或	bin/hadoop namenode -format

启动

start-dfs.sh

start-yarn.sh

mr-jobhistory-daemon.sh start historyserver