hadoop2.4配置与wordcount例子

Hadoop-2.4.0安装和wordcount运行验证

以下描述了64位centos6.5机器下,安装32位hadoop-2.4.0,并通过运行
系统自带的WordCount例子来验证服务正确性的步骤。

建立目录
/home/QiumingLu/hadoop-2.4.0,以后这个是hadoop的安装目录。

安装hadoop-2.4.0,解压hadoop-2.4.0.tar.gz到目录
/home/QiumingLu/hadoop-2.4.0即可
[root@localhosthadoop-2.4.0]# ls
bin etc lib LICENSE.txt NOTICE.txt sbin synthetic_control.data
dfs include libexec logs README.txt share

配置etc/hadoop/hadoop-env.sh
[root@localhosthadoop-2.4.0]#

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cat etc/hadoop/hadoop-env.sh  

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#The java implementation to use.  
exportJAVA_HOME=/home/QiumingLu/mycloud/jdk/jdk1.7.0_51  

因为hadoop是默认32位的，所以要加这个：

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exportHADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_PREFIX}/lib/native  
exportHADOOP_OPTS="-Djava.library.path=$HADOOP_PREFIX/lib"  

否则，可能出现一下错误：

<span style="font-family:DejaVu Sans Mono,monospace;"><span style="font-size:14px;"><span lang="en-US">Unable to load native-hadoop library for your platform... using builtin-java classes where applicable</span></span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">Starting namenodes on [Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/hadoop/2.2.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">localhost]</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">sed: -e expression #1, char 6: unknown option to `s'</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Name or service not known</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">64-Bit: ssh: Could not resolve hostname 64-Bit: Name or service not known</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">Java: ssh: Could not resolve hostname Java: Name or service not known</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">Server: ssh: Could not resolve hostname Server: Name or service not known</span></span>

<span style="font-family:DejaVu Sans Mono,monospace;"><span lang="en-US">VM: ssh: Could not resolve hostname VM: Name or service not known</span></span>

配置etc/hadoop/hdfs-site.xml
[root@localhosthadoop-2.4.0]# cat etc/hadoop/hdfs-site.xml

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<configuration>  
  
<property>  
<name>dfs.replication</name>  
<value>1</value>  
</property>  
<property>  
<name>dfs.namenode.name.dir</name>  
<value>file:/home/QiumingLu/hadoop-2.4.0/dfs/name</value>  
</property>  
<property>  
<name>dfs.datanode.data.dir</name>  
<value>file:/home/QiumingLu/hadoop-2.4.0/dfs/data</value>  
</property>  
  
</configuration>  

配置etc/hadoop/core-site.xml

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<configuration>  
 <property>    
      <name>fs.default.name</name>    
      <value>hdfs://localhost:9000</value>    
   </property>    
</configuration>  

配置etc/hadoop/yarn-site.xml

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<configuration>  
  
<!--Site specific YARN configuration properties -->  
  
<property>  
<name>mapreduce.framework.name</name>  
<value>yarn</value>  
</property>  
<property>  
<name>yarn.nodemanager.aux-services</name>  
<value>mapreduce_shuffle</value>  
</property>  
  
</configuration>  

配置etc/hadoop/mapred-site.xml.template

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[root@localhosthadoop-2.4.0]# cat etc/hadoop/mapred-site.xml.template  
  
<configuration>  
  
<property>  
<name>mapreduce.framework.name</name>  
<value>yarn</value>  
</property>  
  
</configuration>  

格式化文件系统

[root@localhosthadoop-2.4.0]#

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./bin/hadoop namenode -format  

启动服务,这里使用root用户,需要输入密码的时候,输入root用户密码
如果使用非root,并假设分布式服务,需要先解决ssh登录问题,此处不详
细描述。

[root@localhosthadoop-2.4.0]#

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sbin/start-all.sh  

查看启动状态：

[root@localhosthadoop-2.4.0]#

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./bin/hadoop dfsadmin -report  

DEPRECATED:Use of this script to execute hdfs command is deprecated.
Insteaduse the hdfs command for it.

14/04/1805:15:30 WARN util.NativeCodeLoader: Unable to load native-hadooplibrary for your platform... using builtin-java
classes whereapplicable
ConfiguredCapacity: 135938813952 (126.60 GB)
PresentCapacity: 126122217472 (117.46 GB)
DFSRemaining: 126121320448 (117.46 GB)
DFSUsed: 897024 (876 KB)
DFSUsed%: 0.00%
Underreplicated blocks: 0
Blockswith corrupt replicas: 0
Missingblocks: 0

-------------------------------------------------
Datanodesavailable: 1 (1 total, 0 dead)

Livedatanodes:
Name:127.0.0.1:50010 (localhost)
Hostname:localhost
DecommissionStatus : Normal
ConfiguredCapacity: 135938813952 (126.60 GB)
DFSUsed: 897024 (876 KB)
NonDFS Used: 9816596480 (9.14 GB)
DFSRemaining: 126121320448 (117.46 GB)
DFSUsed%: 0.00%
DFSRemaining%: 92.78%
ConfiguredCache Capacity: 0 (0 B)
CacheUsed: 0 (0 B)
CacheRemaining: 0 (0 B)
CacheUsed%: 100.00%
CacheRemaining%: 0.00%
Lastcontact: Fri Apr 18 05:15:29 CST 2014

[root@localhosthadoop-2.4.0]# jps
3614DataNode
3922ResourceManager
3514NameNode
9418Jps
4026NodeManager 
http://localhost:50070



http://localhost:8088

构造数据文件(file1.txt,file2.txt)
[root@localhosthadoop-2.4.0]# cat example/file1.txt 

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hello world  
hello markhuang  
hello hadoop  

[root@localhosthadoop-2.4.0]# cat example/file2.txt

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hadoop ok  
hadoop fail  
hadoop 2.4  

[root@localhosthadoop-2.4.0]#

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./bin/hadoop fs -mkdir /data  

把数据文件加入到hadoop系统。
[root@localhosthadoop-2.4.0]#

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./bin/hadoop fs -put -f example/file1.txtexample/file2.txt /data  

运行WordCount(java)版本。
[root@localhosthadoop-2.4.0]#

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./bin/hadoop jar./share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.4.0-sources.jarorg.apache.hadoop.examples.WordCount /data /output  

查看结果。
[root@localhosthadoop-2.4.0]#

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./bin/hadoop fs -cat /output/part-r-00000  

2.4 1
fail 1
hadoop 4
hello 3
markhuang 1
ok 1
world 1