hadoop2.2.0 centos 编译安装详解

http://blog.csdn.net/w13770269691/article/details/16883663

 

废话不讲，直切正题。

搭建环境:Centos x 6.4 64bit

1、安装JDK

我这里用的是64位机，要下载对应的64位的JDK,下载地址：http://www.oracle.com/technetwork/cn/java/javase/downloads/jdk7-downloads-1880260-zhs.html，选择对应的JDK版本，解压JDK，然后配置环境变量,

 

vi /etc/profile

注：这里有的人喜欢配置在当前用户里，我这里是配置的全局。

 

 

export PATH
export JAVA_HOME=/opt/jdk1.7
export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

 

 

测试下JDK是否安装成功: java -version

 

java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

 

 

2、编译前的准备(maven)

maven官方下载地址，可以选择源码编码安装，这里就直接下载编译好的 就可以了

 

wget http://mirror.bit.edu.cn/apache/maven/maven-3/3.1.1/binaries/apache-maven-3.1.1-bin.zip

 

解压文件后，同样在/etc/profie里配置环境变量

 

export MAVEN_HOME=/opt/maven3.1.1
export PATH=$PATH:$MAVEN_HOME/bin

 

验证配置是否成功: mvn -version

 

Apache Maven 3.1.1 (0728685237757ffbf44136acec0402957f723d9a; 2013-09-17 23:22:22+0800)
Maven home: /opt/maven3.1.1
Java version: 1.7.0_45, vendor: Oracle Corporation
Java home: /opt/jdk1.7/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.32-358.el6.x86_64", arch: "amd64", family: "unix"

3、编译hadoop

 

这个地方你将会遇到各式各样的头疼问题

首先官方下载hadoop源码

 

wget http://mirrors.cnnic.cn/apache/hadoop/common/hadoop-2.2.0/hadoop-2.2.0-src.tar.gz

 如果是你32bit的机器，可以直接下载官方已经编译好的包，64bit的机子跑编译好的包跑不了。

 

        由于maven国外服务器可能连不上，先给maven配置一下国内镜像，在maven目录下，conf/settings.xml,在<mirrors></mirros>里添加，原本的不要动

 

<mirror>
     <id>nexus-osc</id>
      <mirrorOf>*</mirrorOf>
  <name>Nexusosc</name>
  <url>http://maven.oschina.net/content/groups/public/</url>
</mirror>

    同样，在<profiles></profiles>内新添加

 

 

<profile>
       <id>jdk-1.7</id>
       <activation>
         <jdk>1.7</jdk>
       </activation>
       <repositories>
         <repository>
           <id>nexus</id>
           <name>local private nexus</name>
           <url>http://maven.oschina.net/content/groups/public/</url>
           <releases>
             <enabled>true</enabled>
           </releases>
           <snapshots>
             <enabled>false</enabled>
           </snapshots>
         </repository>
       </repositories>
       <pluginRepositories>
         <pluginRepository>
           <id>nexus</id>
          <name>local private nexus</name>
           <url>http://maven.oschina.net/content/groups/public/</url>
           <releases>
             <enabled>true</enabled>
           </releases>
           <snapshots>
             <enabled>false</enabled>
           </snapshots>
         </pluginRepository>
       </pluginRepositories>
     </profile>

编译clean

 

 

cd hadoop2.2.0-src
mvn clean install –DskipTests

发现异常

 

 

[ERROR] Failed to execute goal org.apache.hadoop:hadoop-maven-plugins:2.2.0:protoc (compile-protoc) on project hadoop-common: org.apache.maven.plugin.MojoExecutionException: 'protoc --version' did not return a version -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :hadoop-common

hadoop2.2.0编译需要protoc2.5.0的支持，所以还要下载protoc，下载地址:https://code.google.com/p/protobuf/downloads/list，要下载2.5.0版本噢

 

对protoc进行编译安装前先要装几个依赖包:gcc,gcc-c++,make 如果已经安装的可以忽略

 

yum install gcc
yum intall gcc-c++
yum install make

 

 

安装protoc

 

tar -xvf protobuf-2.5.0.tar.bz2
cd protobuf-2.5.0
./configure --prefix=/opt/protoc/
make && make install

安装完配置下环境变量，就不多说了，跟上面过程一样。

 

 

别急，还不要着急开始编译安装，不然又是各种错误,需要安装cmake,openssl-devel,ncurses-devel依赖

 

yum install cmake
yum install openssl-devel
yum install ncurses-devel

 

 

 

目前的2.2.0 的Source Code 压缩包解压出来的code有个bug 需要patch后才能编译。否则编译hadoop-auth 会提示下面错误：

 

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:testCompile (default-testCompile) on project hadoop-auth: Compilation failure: Compilation failure:
[ERROR] /home/chuan/trunk/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/client/AuthenticatorTestCase.java:[84,13] cannot access org.mortbay.component.AbstractLifeCycle
[ERROR] class file for org.mortbay.component.AbstractLifeCycle not found

 

Patch :https://issues.apache.org/jira/browse/HADOOP-10110

ok,现在可以进行编译了，

 

mvn package -Pdist,native -DskipTests -Dtar

出错：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.6:run (make) on project hadoop-common: An Ant BuildException has occured: exec returned: 1 -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :hadoop-common

 

附常见错误：

configure: error: C++ preprocessor "/lib/cpp" fails sanity check
安装build-essential

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.6:run (make) on project hadoop-hdfs: An Ant BuildException has occured: exec returned: 1 -> [Help 1]
安装libglib2.0-dev

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.6:run (make) on project hadoop-pipes: An Ant BuildException has occured: exec returned: 1 -> [Help 1]
安装libssl-dev

 

安装ant
[root@hadoop1 ~]# wget http://mirror.esocc.com/apache//ant/binaries/apache-ant-1.9.3-bin.tar.gz
[root@hadoop1 ~]# tar zxvf  apache-ant-1.9.3-bin.tar.gz -C /usr/local/
[root@hadoop1 ~]# mv /usr/local/apache-ant-1.9.3/ /usr/local/ant
[root@hadoop1 ~]# vi /etc/profile
export ANT_HOME=/usr/local/ant

安装findbugs
[root@hadoop1 ~]# wget http://prdownloads.sourceforge.net/findbugs/findbugs-2.0.3.tar.gz?download
[root@hadoop1 ~]# tar zxvf findbugs-2.0.3.tar.gz -C /usr/local/
[root@hadoop1 ~]# mv /usr/local/findbugs-2.0.3/ /usr/local/findbugs
[root@hadoop1 ~]# vi /etc/profile
export FINDBUGS_HOME=/usr/local/findbugs

现在可以拿出你的手机，玩会游戏了，慢慢等吧！

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Apache Hadoop Main ................................ SUCCESS [3.709s]
[INFO] Apache Hadoop Project POM ......................... SUCCESS [2.229s]
[INFO] Apache Hadoop Annotations ......................... SUCCESS [5.270s]
[INFO] Apache Hadoop Assemblies .......................... SUCCESS [0.388s]
[INFO] Apache Hadoop Project Dist POM .................... SUCCESS [3.485s]
[INFO] Apache Hadoop Maven Plugins ....................... SUCCESS [8.655s]
[INFO] Apache Hadoop Auth ................................ SUCCESS [7.782s]
[INFO] Apache Hadoop Auth Examples ....................... SUCCESS [5.731s]
[INFO] Apache Hadoop Common .............................. SUCCESS [1:52.476s]
[INFO] Apache Hadoop NFS ................................. SUCCESS [9.935s]
[INFO] Apache Hadoop Common Project ...................... SUCCESS [0.110s]
[INFO] Apache Hadoop HDFS ................................ SUCCESS [1:58.347s]
[INFO] Apache Hadoop HttpFS .............................. SUCCESS [26.915s]
[INFO] Apache Hadoop HDFS BookKeeper Journal ............. SUCCESS [17.002s]
[INFO] Apache Hadoop HDFS-NFS ............................ SUCCESS [5.292s]
[INFO] Apache Hadoop HDFS Project ........................ SUCCESS [0.073s]
[INFO] hadoop-yarn ....................................... SUCCESS [0.335s]
[INFO] hadoop-yarn-api ................................... SUCCESS [54.478s]
[INFO] hadoop-yarn-common ................................ SUCCESS [39.215s]
[INFO] hadoop-yarn-server ................................ SUCCESS [0.241s]
[INFO] hadoop-yarn-server-common ......................... SUCCESS [15.601s]
[INFO] hadoop-yarn-server-nodemanager .................... SUCCESS [21.566s]
[INFO] hadoop-yarn-server-web-proxy ...................... SUCCESS [4.754s]
[INFO] hadoop-yarn-server-resourcemanager ................ SUCCESS [20.625s]
[INFO] hadoop-yarn-server-tests .......................... SUCCESS [0.755s]
[INFO] hadoop-yarn-client ................................ SUCCESS [6.748s]
[INFO] hadoop-yarn-applications .......................... SUCCESS [0.155s]
[INFO] hadoop-yarn-applications-distributedshell ......... SUCCESS [4.661s]
[INFO] hadoop-mapreduce-client ........................... SUCCESS [0.160s]
[INFO] hadoop-mapreduce-client-core ...................... SUCCESS [36.090s]
[INFO] hadoop-yarn-applications-unmanaged-am-launcher .... SUCCESS [2.753s]
[INFO] hadoop-yarn-site .................................. SUCCESS [0.151s]
[INFO] hadoop-yarn-project ............................... SUCCESS [4.771s]
[INFO] hadoop-mapreduce-client-common .................... SUCCESS [24.870s]
[INFO] hadoop-mapreduce-client-shuffle ................... SUCCESS [3.812s]
[INFO] hadoop-mapreduce-client-app ....................... SUCCESS [15.759s]
[INFO] hadoop-mapreduce-client-hs ........................ SUCCESS [6.831s]
[INFO] hadoop-mapreduce-client-jobclient ................. SUCCESS [8.126s]
[INFO] hadoop-mapreduce-client-hs-plugins ................ SUCCESS [2.320s]
[INFO] Apache Hadoop MapReduce Examples .................. SUCCESS [9.596s]
[INFO] hadoop-mapreduce .................................. SUCCESS [3.905s]
[INFO] Apache Hadoop MapReduce Streaming ................. SUCCESS [7.118s]
[INFO] Apache Hadoop Distributed Copy .................... SUCCESS [11.651s]
[INFO] Apache Hadoop Archives ............................ SUCCESS [2.671s]
[INFO] Apache Hadoop Rumen ............................... SUCCESS [10.038s]
[INFO] Apache Hadoop Gridmix ............................. SUCCESS [6.062s]
[INFO] Apache Hadoop Data Join ........................... SUCCESS [4.104s]
[INFO] Apache Hadoop Extras .............................. SUCCESS [4.210s]
[INFO] Apache Hadoop Pipes ............................... SUCCESS [9.419s]
[INFO] Apache Hadoop Tools Dist .......................... SUCCESS [2.306s]
[INFO] Apache Hadoop Tools ............................... SUCCESS [0.037s]
[INFO] Apache Hadoop Distribution ........................ SUCCESS [21.579s]
[INFO] Apache Hadoop Client .............................. SUCCESS [7.299s]
[INFO] Apache Hadoop Mini-Cluster ........................ SUCCESS [7.347s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11:53.144s
[INFO] Finished at: Fri Nov 22 16:58:32 CST 2013
[INFO] Final Memory: 70M/239M
[INFO] ------------------------------------------------------------------------

直到看到上面的内容那就说明编译完成了。

 

 

 

编译后的路径在:hadoop-2.2.0-src/hadoop-dist/target/hadoop-2.2.0

 

[root@localhost bin]# ./hadoop version
Hadoop 2.2.0
Subversion Unknown -r Unknown
Compiled by root on 2013-11-22T08:47Z
Compiled with protoc 2.5.0
From source with checksum 79e53ce7994d1628b240f09af91e1af4
This command was run using /data/hadoop-2.2.0-src/hadoop-dist/target/hadoop-2.2.0/share/hadoop/common/hadoop-common-2.2.0.jar

可以看出hadoop的版本

 

 

[root@localhost hadoop-2.2.0]# file lib//native/*
lib//native/libhadoop.a:        current ar archive
lib//native/libhadooppipes.a:   current ar archive
lib//native/libhadoop.so:       symbolic link to `libhadoop.so.1.0.0'
lib//native/libhadoop.so.1.0.0: <span style="color:#ff0000;">ELF 64-bit LSB shared object, x86-64, version 1</span> (SYSV), dynamically linked, not stripped
lib//native/libhadooputils.a:   current ar archive
lib//native/libhdfs.a:          current ar archive
lib//native/libhdfs.so:         symbolic link to `libhdfs.so.0.0.0'
lib//native/libhdfs.so.0.0.0:   <span style="color:#ff0000;">ELF 64-bit LSB shared object, x86-64, version 1</span> (SYSV), dynamically linked, not stripped

注意红色字体部分，如果下载官网的编译好的包，这里显示的是32-bit。

 

 

hadoop编译成功，下面可以来部署集群。

 

 

5、部署集群准备

     两台以上机器，修改hostname, ssh免登陆，关闭防火墙等

5.1、创建新用户

 

useradd hadoop
su hadoop

  注意以下操作有些需要root权限

 

5.2、修改主机名

 

vi /etc/sysconfig/network

hostname master

注销一下系统

[root@master ~]#

变成master了,修改生效

5.3、修改hosts

vi /etc/hosts
新增你的主机IP和HOSTNAME

192.168.10.10  master
192.168.10.11  slave1

 

    5.4、ssh免登陆

查看ssh

 

[root@localhost data]# rpm -qa|grep ssh
libssh2-1.4.2-1.el6.x86_64
openssh-5.3p1-84.1.el6.x86_64
openssh-server-5.3p1-84.1.el6.x86_64

缺少openssh-clients,

 

yum install openssh-clients

      

修改/etc/ssh/sshd_config

        RSAAuthentication yes

PubkeyAuthentication yes

        AuthorizedKeysFile      .ssh/authorized_keys

 

把这三行放开保存

然后service sshd restart  

现在开始配置无密登录

 

[hadoop@master ~]$ cd /home/hadoop/
[hadoop@master ~]$ ssh-keygen -t rsa

一路回车

 

 

[hadoop@master ~]$ cd .ssh/
[hadoop@master .ssh]$ cp id_rsa.pub authorized_keys
[hadoop@master .ssh]$ chmod 600 authorized_keys

把authorized_keys复制到其他要无密的机器上

 

 

[hadoop@master .ssh]$ scp authorized_keys root@192.168.10.11:/home/hadoop/.ssh/

记得这里是以要以root权限过去，不然会报权限错误

设置.ssh目录权限

 

chmod 700 -R .ssh

每台机子都要无密钥登录，把每台机子产生的密钥添加到文件中就ok 了 cat id_rsa.pub >> .ssh/authorized_keys

 

 

一般情况到这里就可以无密登录了，可是我怎么还是需要密码，经过一翻搜寻才知道这是centos6.4版本的问题，《关于centos ssh无密登录失败的记录》

[hadoop@master .ssh]$ ssh slave1
Last login: Mon Nov 25 14:49:25 2013 from master
[hadoop@slave1 ~]$

看到已经变成slave1了，说明成功鸟

6、开始集群配置工作

 

配置之前在要目录下创建三个目录，用来放hadooop文件和日志数据

 

[hadoop@master ~]$mkdir -p dfs/name
[hadoop@master ~]$mkdir -p dfs/data
[hadoop@master ~]$mkdir -p temp

把之前编译成功的版本移到hadoop目录下，注意目录权限问题

 

下面就开始配置文件

6.1  hadoop-env.sh

找到JAVA_HOME，把路径改为实际地址

        6.2  yarn-env.sh

同6.1

6.3  slave

配置所有slave节点

6.4 core-site.xml

 

              <property>
                              <name>fs.defaultFS</name>
                              <value>hdfs://master:9000</value>   //系统分布式URL
              </property>
<property>
                              <name>io.file.buffer.size</name>
                              <value>131072</value>
              </property>
             <property>
                              <name>hadoop.tmp.dir</name>
                              <value>file:/home/hadoop/temp</value>
              </property>
             <property>
                         <name>hadoop.proxyuser.hadoop.hosts</name>
                        <value>*</value>
            </property>
               <property>
                         <name>hadoop.proxyuser.hadoop.groups</name>
                        <value>*</value>
             </property>

 

  注意fs.defaultFS为2.2.0新的变量，代替旧的：fs.default.name

6.5、hdfs-site.xml

配置namenode、datanode的本地目录信息

<property>
                <name>dfs.namenode.secondary.http-address</name>
               <value>master:9001</value>
        </property>
         <property>
                  <name>dfs.namenode.name.dir</name>
                 <value>/home/hadoop/dfs/name</value>
            </property>
           <property>
                    <name>dfs.datanode.data.dir</name>
                    <value>/home/hadoop/dfs/data,/mnt/d1,/mnt/d2,/mnt/d3<table border="1" cellspacing="0" cellpadding="0" style="background:black;"><tbody><tr><td valign="top"><span style="background-color: rgb(240, 240, 240);"></value></span></td></tr></tbody></table>            </property>
<span style="white-space:pre">  </span><property>
                     <name>dfs.replication</name>
                     <value>3</value>
             </property>
<span style="white-space:pre">      </span><property>
                     <name>dfs.webhdfs.enabled</name>
<span style="white-space:pre">          </span><value>true</value>
         </property>

新的：dfs.namenode.name.dir，旧：dfs.name.dir，新：dfs.datanode.name.dir，旧：dfs.data.dir
dfs.replication确定 data block的副本数目，hadoop基于rackawareness(机架感知)默认复制3份分block,（同一个rack下两个，另一个rack下一 份，按照最短距离确定具体所需block, 一般很少采用跨机架数据块，除非某个机架down了）

 

6.6、mapred-site.xml

配置其使用 Yarn 框架执行 map-reduce 处理程序

这个地方需要把mapred-site.xml.template复制重新命名

 

<property>
                              <name>mapreduce.framework.name</name>
                              <value>yarn</value>
              </property>
              <property>
                              <name>mapreduce.jobhistory.address</name>
                              <value><span style="font-family: Consolas, 'Courier New', Courier, mono, serif; line-height: 18px;">master</span>:10020</value>
              </property>
              <property>
             <name>mapreduce.jobhistory.webapp.address</name>
             <value>master:19888</value>

     </property>

新的计算框架取消了实体上的jobtracker, 故不需要再指定mapreduce.jobtracker.addres，而是要指定一种框架，这里选择yarn. 备注2：hadoop2.2.还支持第三方的计算框架，但没怎么关注过。
配置好以后将$HADOOP_HOME下的所有文件，包括hadoop目录分别copy到其它3个节点上。

 

 

    6.7、yarn-site.xml

配置ResourceManager,NodeManager的通信端口，WEB监控端口等

 

    <property>
              <name>yarn.nodemanager.aux-services</name>
              <value>mapreduce_shuffle</value>
       </property>
       <property>
              <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
              <value>org.apache.hadoop.mapred.ShuffleHandler</value>
       </property>
<property>
              <name>yarn.resourcemanager.address</name>
              <value>master:8032</value>
      </property>
       <property>
              <name>yarn.resourcemanager.scheduler.address</name>
              <value>master:8030</value>
       </property>
       <property>
                      <name>yarn.resourcemanager.resource-tracker.address</name>
                       <value>master:8031</value>
        </property>
        <property>
                      <name>yarn.resourcemanager.admin.address</name>
                       <value>master:8033</value>
         </property>
         <property>
              <name>yarn.resourcemanager.webapp.address</name>
              <value>master:8088</value>
          </property>

<table cellspacing="0" cellpadding="0" class="t1     "><tbody><tr><td valign="middle" class="td1"><p class="p1"><property></p><p class="p1"><name>yarn.nodemanager.resource.memory-mb</name> //配置内存</p><p class="p1"><value>15360</value></p><p class="p1"></property></p></td></tr></tbody></table>

<table cellspacing="0" cellpadding="0" class="t1     "><tbody><tr><td valign="middle" class="td1"><p class="p1"><span style="background-color: rgb(255, 255, 255);">到这里基本配置好了，把所有复制到其他的slave节点。</span></p></td></tr></tbody></table>

 

7、启动hadoop

这里你可以进行环境变量设置，不举例了

7.1、格式化namenode

 

[hadoop@master hadoop]$ cd /home/hadoop/hadoop-2.2.0/bin/
[hadoop@master bin]$ ./hdfs namenode -format

7.2、启动hdfs

 

 

[hadoop@master bin]$ cd ../sbin/
[hadoop@master sbin]$ ./start-dfs.sh

这时候在master中输入jps应该看到namenode和secondarynamenode服务启动，slave中看到datanode服务启动

7.3、启动yarn

 

 

[hadoop@master sbin]$ ./start-yarn.sh

 

 

master中应该有ResourceManager服务，slave中应该有nodemanager服务

查看集群状态：./bin/hdfs dfsadmin –report

查看文件块组成：  ./bin/hdfsfsck / -files -blocks

查看各节点状态:    http://192.168.10.10:50070

查看resourcemanager上cluster运行状态:    http:// 192.168.10.11:8088

8、安装中要注意的事项

8.1、注意版本，机器是32bit还是64位

8.2、注意依赖包的安装

8.3、写配置文件注意”空格“，特别是从别的地方copy的时候

8.4、关闭所有节点的防火墙

如果有看到类似"no route to host"这样的异常，基本就是防火墙没关

记得关的时候要切换到root帐号

 

（1） 重启后永久性生效：

开启：chkconfig iptables on

关闭：chkconfig iptables off

（2） 即时生效，重启后失效：

开启：service iptables start

关闭：service iptables stop

8.5、开启datanode后自动关闭

 

 基本是因为namenode和datanode的clusterID不一致，可以参考《解决hadoop集群中datanode启动后自动关闭的问题》

 

其他一些特殊异常只能google之了

8.6 no datanode to stop

删除/tmp目录下的

adoop-daemon.sh代码，脚本是通过pid文件来停止hadoop服务的，而集群配置是使用的默认配置，pid文件位于/tmp目录下，对比/tmp目录下hadoop pid文件中的进程id和ps ax查出来的进程id，发现两个进程id不一致，终于找到了问题的根源。
赶紧去更新hadoop的配置吧！
修改hadoop-env.sh中的：HADOOP_PID_DIR = hadoop安装路径

9、运行测试例子

 

[hadoop@master bin]$ ./yarn jar ../share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar randomwriter /home/hadoop/dfs/input/

这里要注意不要用 -jar,不然会报异常“Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/util/ProgramDriver”

 

 

[hadoop@master bin]$ ./yarn jar ../share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /home/hadoop/dfs/input/ /home/hadoop/dfs/output/

在input下面新建两个文件

 

 

$mkdir /dfs/input %echo ‘hello,world’ >> input/file1.in
$echo ‘hello, ruby’ >> input/file2.in

./bin/hadoop fs -mkdir -p /home/hadoop/dfs/input
./bin/hadoop fs –put /home/hadoop/dfs/input /home/hadoop/test/test_wordcount/in

查看word count的计算结果：
$bin/hadoop fs -cat /home/hadoop/test/test_wordcount/out/*
hadoop 1
hello  1
ruby