This document provides instructions for setting up Hadoop in single node mode on Ubuntu. It describes adding a Hadoop user, installing Java and SSH, downloading and extracting Hadoop, configuring environment variables and Hadoop configuration files, and formatting the NameNode.

1. HADOOP SINGLE NODE
SETUP

2. Software Versions Used
• Linux (Ubuntu-12.04)
• Java (Oracle Java 7)
• SSH
• Hadoop-1.0.3

3. Prerequisites
• Dedicated Hadoop User
• SSH
• Oracle Java
• KeyPair Generation

4. Adding The Hadoop User
• Add the user
sudo useradd hadoop
• Assign the privilages
sudo visudo
hadoop ALL=(ALL) ALL

5. Install And Configure SSH
• Install SSH
sudo apt-get install ssh
• Generate the KeyPair
ssh-keygen –t rsa –P “”
• Make the SSH passwordless
cat ~/.ssh/id_rsa.pub > ~/.ssh/authorized_keys

6. Install Java
• Add the “WEBUPD8″ PPA
sudo add-apt-repository pa:webupd8team/java
• Update the repositories
sudo apt-get update
• Begin the installation
sudo apt-get install oracle-java7-installer

7. Confiure Hadoop
• Download the latest stable release
http://apache.techartifact.com/mirror/hadoop/co
mmon/stable/hadoop-1.0.3.tar.gz
• Unpack the release
tar –zxvf hadoop-1.0.3.tar.gz
• Save the extracted folder to some convinient
location

8. Confiure Hadoop Contd…
• Create HADOOP_HOME
sudo gedit ~/.bashrc
“export HADOOP_HOME=/user/home/hadoop-
1.0.3”
• Edit the configuration files
hadoop-env.sh
core-site.xml
hdfs-site.xml
mapred-site.xml

9. • hadoop-env.sh
Set the JAVA_HOME variable
export JAVA_HOME=/usr/lib/jvm/java-7-oracle
NOTE :
- Before moving further, create a directory, hdfs for
instance, with sub directories viz. name, data and tmp.
- Change the permissions of the directories created in the
previous step to 755

10. • core-site.xml
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/your_username/hdfs/tmp</value>
</property>

11. • hdfs-site.xml
<property>
<name>dfs.name.dir</name>
<value>/home/your_username/hdfs/name</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/home/your_username/hdfs/data</value>
</property>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>

12. • mapred-site.xml
<property>
<name>mapred.job.tracker</name>
<value>localhost:9001</value>
</property>
• Format the NameNode
bin/hadoop namenode -format