目錄
一、 下載jdk
二、 配置hadoop
三、 配置ssh，無密碼登入
四、 啟動hadoop
五、 環境配置

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
下載hadoop，自己可到官網下載穩定版本，本次搭建用的是hadoop-2.6.0
配置hadoop 裡面hadoop-2.6.0/etc/hadoop資料夾四個檔案（hadoop-env.sh,core-site.xml,mapred-site.xml,hdfs-site.xml）
下載完hadoop之後，把它解壓到你想存放的資料夾，然後進入hadoop的etc/hadoop目錄
1. 配置hadoop-env.sh
修改為：

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

即去掉前面的解釋符#，mac的jdk安裝在根目錄Libray資料夾下面。
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，無密碼登入
mac上已經ssh了，在終端輸入ssh-keygen -t rsa命令，碰到需要輸入密碼的直接按enter健即可。出現如下成功

•   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 jia@JIAS-MacBook-Pro.local
•   The key's randomart image is:
•   +--[ RSA 2048]----+
•   |. .o.o     ..    |
•   | =. . .  ...     |
•   |. o.    ...      |
•   | ...   ..        |
•   |  .... .S        |
•   |  ... o          |
•   | ...   .         |
•   |o oo.            |
•   |E*+o.            |
•   +-----------------+

在終端輸入cd ~進入使用者目錄，再輸入cd .ssh目錄，輸入命令

cp id_rsa.pub authorized_keys

四. 啟動hadoop
1. 進入hadoop資料夾，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.啟動hadoop守護程序

bin/start-all.sh

3.停止hadoop守護程序

bin/stop-all.sh

五. 環境配置

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