分散式-ubuntu12.04安装hadoop1.2.1

在hadoop1.2.1被预装在一份报告中安装说明java。我装了很多的版本号java以及许多的版本号hadoop，然后发现oracle-java7与hadoop1.2.1能够匹配。

一，安装详细过程例如以下：

1. 安装java： sudo apt-get install oracle-java7-installer

2. 安装hadoop1.2.1： http://hadoop.apache.org/docs/r1.2.1/single_node_setup.html#Download
二。測试是否成功安装（伪分布式模式）：

Format a new distributed-filesystem:

$ bin/hadoop namenode -format

Start the hadoop daemons:

$ bin/start-all.sh

The hadoop daemon log output is written to the ${HADOOP_LOG_DIR} directory (defaults to ${HADOOP_HOME}/logs).

Browse the web interface for the NameNode and the JobTracker; by default they are available at:

NameNode - http://localhost:50070/
JobTracker - http://localhost:50030/
Copy the input files into the distributed filesystem:

$ bin/hadoop fs -put conf input

Run some of the examples provided:

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

Examine the output files:

Copy the output files from the distributed filesystem to the local filesytem and examine them:

$ bin/hadoop fs -get output output

$ cat output/*

When you're done, stop the daemons with:

$ bin/stop-all.sh

三。web UI

1. NameNode：http://localhost:50070/

2. JobTracker ：http://localhost:50030/