Mac安装hadoop伪分布式

目录
一、 下载jdk
二、 配置Hadoop
三、 配置ssh，无密码登录
四、 启动hadoop
五、 环境配置

一. 下载jdk
选择最新版本下载，地址：http://www.oracle.com/technetwork/java/javase/downloads/index.html
安装完成之后，打开终端，输入Java -version ,出现类似如下说明安装成功。

java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

二. 配置hadoop
下载hadoop，自己可到官网下载稳定版本，本次搭建用的是hadoop-2.6.0
配置hadoop 里面hadoop-2.6.0/etc/hadoop文件夹四个文件（hadoop-env.sh,core-site.xml,mapred-site.xml,hdfs-site.xml）
下载完hadoop之后，把它解压到你想存放的文件夹，然后进入hadoop的etc/hadoop目录
1. 配置hadoop-env.sh
修改为：

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
export HADOOP_HEAPSIZE=2000
export HADOOP_OPTS=-server

即去掉前面的解释符#，mac的jdk安装在根目录Libray文件夹下面。
2. 配置core-site.xml

<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>file:/Users/duwei/software/hadoop-2.6.0/tmp</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://hadoop0:9000</value>
</property>
</configuration>

3.配置mapred-site.xml

<configuration>
<property>
<name>mapred.job.tracker</name>
<value>hdfs://localhost:9001</value>
</property>
</configuration>

4.配置hdfs-site.xml

<configuration>
<property>
<name>dfs.namenode.name.dir</name>
<value>/Users/duwei/software/hadoop-2.6.0/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>/Users/duwei/software/hadoop-2.6.0/hdfs/datanode</value>
</property>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>

三. 配置ssh，无密码登录
mac上已经ssh了，在终端输入ssh-keygen -t rsa命令，碰到需要输入密码的直接按enter健即可。出现如下成功

• Enter passphrase (empty for no passphrase):
• Enter same passphrase again:
• Your identification has been saved in /Users/jia/.ssh/id_rsa.
• Your public key has been saved in /Users/jia/.ssh/id_rsa.pub.
• The key fingerprint is:
• d4:85:aa:83:ae:db:50:48:0c:5b:dd:80:bb:fa:26:a7 [e-mail]
• The key's randomart image is:
• +--[ RSA 2048]----+
• |. .o.o .. |
• | =. . . ... |
• |. o. ... |
• | ... .. |
• | .... .S |
• | ... o |
• | ... . |
• |o oo. |
• |E*+o. |
• +-----------------+

在终端输入cd ~进入用户目录，再输入cd .ssh目录，输入命令

cp id_rsa.pub authorized_keys

四. 启动hadoop
1. 进入hadoop文件夹，用如下命令格式化

cd bin
./hadoop namenode –format

/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = JIAS-MacBook-Pro.local/192.168.1.3
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 0.20.2
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
Re-format filesystem in /tmp/hadoop-jia/dfs/name ? (Y or N) Y
14/07/14 13:55:17 INFO namenode.FSNamesystem: fsOwner=jia,staff,everyone,localaccounts,_appserverusr,admin,_appserveradm,_lpadmin,com.apple.sharepoint.group.1,_appstore,_lpoperator,_developer,com.apple.access_screensharing,com.apple.access_ssh
14/07/14 13:55:17 INFO namenode.FSNamesystem: supergroup=supergroup
14/07/14 13:55:17 INFO namenode.FSNamesystem: isPermissionEnabled=true
14/07/14 13:55:17 INFO common.Storage: Image file of size 93 saved in 0 seconds.
14/07/14 13:55:17 INFO common.Storage: Storage directory /tmp/hadoop-jia/dfs/name has been successfully formatted.
14/07/14 13:55:17 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at JIAS-MacBook-Pro.local/192.168.1.3
************************************************************/

2.启动hadoop守护进程

bin/start-all.sh

3.停止hadoop守护进程

bin/stop-all.sh

五. 环境配置

vi .bash_profile
export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)
export HADOOP_HOME=/Users/duwei/software/hadoop-2.6.0
export PATH=$PATH:$HADOOP_HOME/bin

用如下命令使其生效

source ~/.bash_profile