Hadoop1.2.1安装部署

安装需求

  • Java 1.6
  • ssh,sshd正常安装

确保可以ssh到localhost,并且不需要密码

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ssh localhost

如果报错,connect to host localhost port 22:Connection refused。说明ssh-server未安装或者未启动。
运行:

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ps -ef | grep sshd

查看sshd进程是否存在,如果不存在,说明没有安装。那么进行安装。

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sudo apt-get install openssh-server

然后再执行ssh localhost,如果不能无密码登陆,需要做一下操作:

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ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

相关软件

Ubuntu Linux为例:

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sudo apt-get install ssh
sudo apt-get install rsync

Hadoop下载

Hadoop官网下载一个稳定版,这里就是1.2.1版本啦。

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wget http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-1.2.1/hadoop-1.2.1.tar.gz

启动Hadoop

1.解压tar -xzvf hadoop-1.2.1.tar.gz,进入conf/hadoop-env.sh,设置JAVA_HOME为你的JDK目录。

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export JAVA_HOME=/path/to/java/home

2.进入/hadoop-1.2.1目录,运行bin\hadoop,会显示hadoop的使用说明信息。

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  Usage: hadoop [--config confdir] COMMAND
where COMMAND is one of:
namenode -format format the DFS filesystem
secondarynamenode run the DFS secondary namenode
namenode run the DFS namenode
datanode run a DFS datanode
dfsadmin run a DFS admin client
mradmin run a Map-Reduce admin client
fsck run a DFS filesystem checking utility
fs run a generic filesystem user client
balancer run a cluster balancing utility
oiv apply the offline fsimage viewer to an fsimage
fetchdt fetch a delegation token from the NameNode
jobtracker run the MapReduce job Tracker node
pipes run a Pipes job
tasktracker run a MapReduce task Tracker node
historyserver run job history servers as a standalone daemon
job manipulate MapReduce jobs
queue get information regarding JobQueues
version print the version
jar <jar> run a jar file
distcp <srcurl> <desturl> copy file or directories recursively
distcp2 <srcurl> <desturl> DistCp version 2
archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive
classpath prints the class path needed to get the
Hadoop jar and the required libraries
daemonlog get/set the log level for each daemon
or
CLASSNAME run the class named CLASSNAME
Most commands print help when invoked w/o parameters.

你可以下3中模式来启动hadoop:

  • 本地(standalone)模式
  • 伪分布(Pseudo-Distributed)式
  • 全分布(Full-Distributed)式

本地(Standalone)模式安装

默认情况下,Hadoop就是单机本地模式。方便调试。
下面是一个样例,复制conf目录到input作为输入,找出符合正则的文件,输出到output目录

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$ mkdir input
$ cp conf/*.xml input
$ bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+'
$ cat output/*

伪分布(Pseudo-Distributed)式

配置conf/core-site.xml

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

配置conf/hdfs-site.xml

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

配置conf/mapred-site.xml:

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<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:9001</value>
</property>
</configuration>

格式化一个新的distributed-filesystem

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bin/hadoop namenode -format

启动hadoop:

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bin/start-all.sh

此时可以通过WEB UI控制台来监控NameNode,JobTracker,TaskTracker

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$ bin/hadoop fs -put conf input

运行:

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$ bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+'

检查结果:

拷贝output目录到本地并检查:

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$ bin/hadoop fs -get output output
$ cat output/*

或者直接在distributed filesystem查看:

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$ bin/hadoop fs -cat output/*

使用完,可以这样来关闭:

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$ bin/stop-all.sh

Hadoop分布式部署

详见http://hadoop.apache.org/docs/r1.2.1/cluster_setup.html


参考文档:http://hadoop.apache.org/docs/r1.2.1/single_node_setup.html

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