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在Mac上安装Hadoop

获取Java

我的Mac运行的操作系统是OS X 10.7 Lion,之前已经安装过Java了,可以在实用工具->终端中使用java -version命令来确认java的版本。如果没有安装java,也可以进入下面网址下载:http://support.apple.com/kb/dl1421

 

获取Hadoop

具体的地址自己百度吧。我下载的是1.0.4的stable版本。

下载完之后解压缩,我这里放置的目录是/users/Billy/Hadoop。

 

设置环境变量

在实际启动Hadoop之前,有三个文件需要进行配置。

但在这之前,我们需要设置一下几个类似Windows的环境变量,方便以后在命令行敲命令。

export HADOOP_HOME=/users/billy/hadoop

export PATH=$PATH:$HADOOP_HOME/bin

 

配置hadoop-env.sh

在Hadoop->conf目录下,找到hadoop-env.sh,打开编辑进行如下设置:

export JAVA_HOME=/library/Java/Home(去掉注释)

export HADOOP_HEAPSIZE=2000(去掉注释)

export HADOOP_OPTS=”-Djava.security.krb5.realm=OX.AC.UK -Djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk”(去掉注释)

注意第三个配置在OS X上最好进行配置,否则会报“Unable to load realm info from SCDynamicStore”。

配置core-site.xml

<configuration>
    <property>
        <name>mapred.job.tracker</name>
        <value>localhost:8021</value>
    </property>

    <property>
        <name>mapred.tasktracker.map.tasks.maximum</name>
        <value>2</value>
    </property>

    <property>
        <name>mapred.tasktracker.reduce.tasks.maximum</name>
        <value>2</value>
    </property>
</configuration>

配置hdfs-site.xml

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>

</configuration>

配置mapred-site.xml

<configuration>
  <property>
    <name>hadoop.tmp.dir</name>
    <value>/users/billy/hadoop/tmp/hadoop-${user.name}</value>
    <description>A base for other temporary directories.</description>
  </property>
  <property>
    <name>fs.default.name</name>
    <value>hdfs://localhost:8020</value>
  </property>
</configuration>

安装HDFS

经过以上的配置,就可以进行HDFS的安装了。

$HADOOP_HOME/bin/hadoop name node -format

如果顺利的话,会得到类似如下的输出:

BillymatoMacBook-Air:hadoop Billy$ $HADOOP_HOME/bin/hadoop namenode -format

Warning: $HADOOP_HOME is deprecated.

 

12/12/02 17:11:12 INFO namenode.NameNode: STARTUP_MSG:

/********************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = BillymatoMacBook-Air.local/192.168.1.102

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 1.0.4

STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by ‘hortonfo’ on Wed Oct  3 05:13:58 UTC 2012

********************/

12/12/02 17:11:12 INFO util.GSet: VM type       = 64-bit

12/12/02 17:11:12 INFO util.GSet: 2% max memory = 39.9175 MB

12/12/02 17:11:12 INFO util.GSet: capacity      = 2^22 = 4194304 entries

12/12/02 17:11:12 INFO util.GSet: recommended=4194304, actual=4194304

12/12/02 17:11:12 INFO namenode.FSNamesystem: fsOwner=Billy

12/12/02 17:11:12 INFO namenode.FSNamesystem: supergroup=supergroup

12/12/02 17:11:12 INFO namenode.FSNamesystem: isPermissionEnabled=true

12/12/02 17:11:12 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100

12/12/02 17:11:12 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)

12/12/02 17:11:13 INFO namenode.NameNode: Caching file names occuring more than 10 times

12/12/02 17:11:13 INFO common.Storage: Image file of size 111 saved in 0 seconds.

12/12/02 17:11:13 INFO common.Storage: Storage directory /users/Billy/hadoop/tmp/hadoop-Billy/dfs/name has been successfully formatted.

12/12/02 17:11:13 INFO namenode.NameNode: SHUTDOWN_MSG:

/********************

SHUTDOWN_MSG: Shutting down NameNode at BillymatoMacBook-Air.local/192.168.1.102

********************/

启动Hadoop

很简单,一条命令搞定。

$HADOOP_HOME/bin/start-all.sh

顺利的话,一般会让你输入三次账号的密码。

 

简单调试

如果想试试看是否已经成功启动,可以用自带的例子试验一下:

$hadoop jar $HADOOP_HOME/hadoop-example-1.0.4.jar pi 10 100

成功的话,会有类似结果:

BillymatoMacBook-Air:hadoop Billy$ hadoop jar $HADOOP_HOME/hadoop-examples-1.0.4.jar pi 10 100

Warning: $HADOOP_HOME is deprecated.

 

Number of Maps  = 10

Samples per Map = 100

Wrote input for Map #0

Wrote input for Map #1

Wrote input for Map #2

Wrote input for Map #3

Wrote input for Map #4

Wrote input for Map #5

Wrote input for Map #6

Wrote input for Map #7

Wrote input for Map #8

Wrote input for Map #9

 

到这里,单节点的Hadoop就在Mac OS X上安装完成了。

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