从官网下载hadoop2.5.1 64位。

本文以hadoop2.5.1为例。。

分享本人百度云下载连接:http://pan.baidu.com/s/1miSG3by

下载好之后 上传到服务器中 本文上传到 /usr/local

解压 ：tar -zxvf hadoop-2.5.1-x64.tar.gz

创建软连接 ：ln -sf hadoop-2.5.1 /home/hadoop-2.5/

配置hadoop-2.5.1分布式的官网文档：https://hadoop.apache.org/docs/r2.5.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html

先设置hadoo配置文件的路径： 修改文件vim /home/hadoop-2.5/etc/hadoop/hadoop-env.sh

修改hadoop配置文件

cd /home/hadoop-2.5/etc/hadoop

vim hdfs-site.xml

export JAVA_HOME=/usr/local/jdk1.8.0_11

如果不配置java_home 启动的时候会失败。

CENTOS 配置JDK教程：http://blog.csdn.net/a295277302/article/details/70245779

内容为：

<configuration>
<property>
<name>dfs.nameservices</name>
<value>htf</value>
</property>
<property>
<name>dfs.ha.namenodes.htf</name>
<value>nn1,nn2</value>
</property>
<property>
<name>dfs.namenode.rpc-address.htf.nn1</name>
<value>192.168.6.128:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.htf.nn2</name>
<value>192.168.6.129:8020</value>
</property>
<property>
<name>dfs.namenode.http-address.htf.nn1</name>
<value>192.168.6.128:50070</value>
</property>
<property>
<name>dfs.namenode.http-address.htf.nn2</name>
<value>192.168.6.129:50070</value>
</property>
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://192.168.6.129:8485;192.168.6.130:8485;192.168.6.132:8485/htf</value>
</property>
<property>
<name>dfs.client.failover.proxy.provider.htf</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
<property>
<name>dfs.ha.fencing.methods</name>
<value>sshfence</value>
</property>


<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/root/.ssh/id_dsa</value>
</property>
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/opt/jn/data</value>
</property>
<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
</property>
</configuration>

修改 vim core-site.xml

内容为：

<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://htf</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>192.168.6.128:2181,192.168.6.129:2181,192.168.6.130:2181</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/opt/hadoop2</value>
</property>
</configuration>

修改slaves文件

vim slaves

192.168.6.129
192.168.6.130
192.168.6.132

配置完这些之后 格式化namenode -format

进入cd /home/hadoop-2.5/bin

./hdfs namenode -format

之后在配置的数据文件夹下能看到格式化的数据文件

/opt/hadoop2/dfs/name/current

先将一种配置的配置文件发送到其他服务器中。

scp -r /home/hadoop-2.5/etc/hadoop/* 192.168.6.129:/home/hadoop-2.5/etc/hadoop

其他服务器也要复制过去，此处不一一概述

之后要在另外一个namenode中格式化 namenode,即生成/opt/hadoop2/dfs/name/current

下的数据文件

官网说明：

• If you have already formatted the NameNode, or are converting a non-HA-enabled cluster to be HA-enabled, you should now copy over the contents of your NameNode metadata directories to the other, unformatted NameNode by running the command "hdfs namenode -bootstrapStandby" on the unformatted NameNode. Running this command will also ensure that the JournalNodes (as configured bydfs.namenode.shared.edits.dir) contain sufficient edits transactions to be able to start both NameNodes.

	 ./hdfs zkfc -formatZK