hadoop集群搭建(hadoop)
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首先说一下配置环境:三台电脑
192.168.30.149 hadoop149 namenode和jobtracker ###因为149机器稍微好一点192.168.30.150 hadoop150 datanode和TaskTracker192.168.30.148 hadoop150 datanode和TaskTracker
配置ssh无需密码登陆:
$ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa$ cat~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
我的master在149可以吧149的.pub文件拷贝到150和148上 然后执行cat~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys如果存在问题有可能是文件权限问题!
我用的hadoop版本是hadoop-0.20.2 下载地址:
google吧 过两天弄个网盘都放在上面再写到这里。
下载后:编辑几个文件:
在/root/hadoop-0.20.2/conf中(这里注意的是几台电脑的hadoop文件路径必须相同):加入如下一句话
[root@localhostconf]# vim hadoop-env.sh
exportJAVA_HOME=/usr/java/jdk1.7.0_01 ###设置变量[root@localhostconf]# vim core-site.xml
<?xmlversion="1.0"?><?xml-stylesheettype="text/xsl" href="configuration.xsl"?> <!-- Put site-specificproperty overrides in this file. --> <configuration><property><name>fs.default.name</name><value>hdfs://192.168.30.149:9000</value> ###具体的意义之后会讲解</property></configuration>[root@localhostconf]# vim mapred-site.xml
<?xmlversion="1.0"?><?xml-stylesheettype="text/xsl" href="configuration.xsl"?> <!-- Putsite-specific property overrides in this file. --> <configuration><property><name>mapred.job.tracker</name><value>hdfs://192.168.30.149:9004</value></property></configuration>[root@localhostconf]# vim hdfs-site.xml
<?xmlversion="1.0"?><?xml-stylesheettype="text/xsl" href="configuration.xsl"?> <!-- Putsite-specific property overrides in this file. --> <configuration><property><name>dfs.replication</name><value>2</value></property></configuration>
[root@localhostconf]# vim masters
hadoop149[root@localhostconf]# vim slaves
hadoop150hadoop148一共编辑了5个文件,具体意义代表什么,之后会讲到
这里注意要被指/etc/hosts文件,如下(192.168.30.149):
[root@localhostconf]# vim /etc/hosts
# Do not removethe following line, or various programs# that requirenetwork functionality will fail.127.0.0.1 localhost.localdomain localhost::1 localhost6.localdomain6 localhost6 192.168.30.149hadoop149192.168.30.150hadoop150192.168.30.148hadoop1484.启动hadoop:
这里用简单的命令进行启动,
A.格式化文件系统:
#bin/hadoop namenode –formatB.启动hadoop
#bin/start-all.shC.利用hadoop自带的例子测试hadoop是否启动成功
#bin/hadoop fs -mkdir input ###在文件系统中创建input文件夹#bin/hadoopfs -put README.txt input ###把本地readme.txt上传到input中#bin/hadoop fs –lsr ###查看本件系统所有文件 存在文件并且大小不为0则hadoop文件系统搭建成功。#bin/hadoopjar hadoop-0.20.2-examples.jar wordcount input/README.txt output ###将输出结果输出到output中#bin/hadoop jar hadoop-0.20.2-examples.jar wordcount input/1.txt output11/12/02 17:47:14 INFOinput.FileInputFormat: Total input paths to process : 1
11/12/02 17:47:14 INFO mapred.JobClient:Running job: job_201112021743_0001
11/12/02 17:47:15 INFOmapred.JobClient: map 0% reduce 0%
11/12/02 17:47:22 INFOmapred.JobClient: map 100% reduce 0%
11/12/02 17:47:34 INFOmapred.JobClient: map 100% reduce 100%
11/12/02 17:47:36 INFO mapred.JobClient:Job complete: job_201112021743_0001
11/12/02 17:47:36 INFO mapred.JobClient:Counters: 17
11/12/02 17:47:36 INFOmapred.JobClient: Job Counters
11/12/02 17:47:36 INFOmapred.JobClient: Launched reducetasks=1
11/12/02 17:47:36 INFOmapred.JobClient: Launched maptasks=1
11/12/02 17:47:36 INFOmapred.JobClient: Data-local maptasks=1
11/12/02 17:47:36 INFOmapred.JobClient: FileSystemCounters
11/12/02 17:47:36 INFOmapred.JobClient: FILE_BYTES_READ=32523
11/12/02 17:47:36 INFOmapred.JobClient: HDFS_BYTES_READ=44253
11/12/02 17:47:36 INFOmapred.JobClient: FILE_BYTES_WRITTEN=65078
11/12/02 17:47:36 INFOmapred.JobClient: HDFS_BYTES_WRITTEN=23148
11/12/02 17:47:36 INFOmapred.JobClient: Map-Reduce Framework
11/12/02 17:47:36 INFOmapred.JobClient: Reduce inputgroups=2367
11/12/02 17:47:36 INFOmapred.JobClient: Combine outputrecords=2367
11/12/02 17:47:36 INFOmapred.JobClient: Map inputrecords=734
11/12/02 17:47:36 INFOmapred.JobClient: Reduce shufflebytes=32523
11/12/02 17:47:36 INFOmapred.JobClient: Reduce outputrecords=2367
11/12/02 17:47:36 INFO mapred.JobClient: Spilled Records=4734
11/12/02 17:47:36 INFOmapred.JobClient: Map outputbytes=73334
11/12/02 17:47:36 INFOmapred.JobClient: Combine inputrecords=7508
11/12/02 17:47:36 INFOmapred.JobClient: Map outputrecords=7508
11/12/02 17:47:36 INFOmapred.JobClient: Reduce inputrecords=2367
也可以通过本地浏览器进行查看状态:50070和50030端口(注意配置本地C:\Windows\System32\drivers\etc\hosts文件)
192.168.30.150 hadoop150192.168.30.149 hadoop149192.168.30.148 hadoop148
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