9 Recommended Steps to create Hadoop Cluster

9 Steps to perform to setup hadoop cluster on your PC/Laptop in your centos either in local or virtual machine.

Step 1:  Installing Sun Java on Linux. Commands to execute for the same:

sudo apt-add-repository ppa:flexiondotorg/java

sudo apt-get update

sudo apt-get install sun-java6-jre sun-java6-plugin

sudo update-java-alternatives -s java-6-sun

Step 2:  Create Hadoop User. Commands to execute for the same:

$sudo addgroup hadoop

$sudo adduser —ingroup hadoop hduser

Step 3:  Install SSH Server if not already present. Commands are:

$ sudo apt-get install openssh-server

$ su - hduser

$ ssh-keygen -t rsa -P ""

$ cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys

Step 4:  Installing Hadoop. Commands for the same are:

$wget http://www.eng.lsu.edu/mirrors/apache/hadoop/core/hadoop-0.22.0/hadoop-0.22.0.tar.gz

$ cd /home/hduser

$ tar xzf hadoop-0.22.2.tar.gz

$ mv hadoop-0.22.2 hadoop

Step 5:  Edit .bashrc. Commands:

# Set Hadoop-related environment variables

export HADOOP_HOME=/home/hduser/hadoop

# Set JAVA_HOME (we will also configure JAVA_HOME directly for Hadoop later on)

export JAVA_HOME=/usr/lib/jvm/java-6-sun

Step 6:  Update hadoop-env.sh

Here we need to only update the JAVA_HOME variable, we just need to open the file from text editor.

$vi /home/hduser/hadoop/conf/hadoop-env.sh

And update the following:

export JAVA_HOME=/usr/lib/jvm/java-6-sun

Step 7:  Update the files residing in the conf folder.  The three main files are:

Core-site.xml

Mapred-site.xml

Hdfs-site.xml

Here we need to change the value of namenode and jobtracker to where we want to run.

Step 8:  Start the hadoop cluster, using command.

Start-all.sh

Step 9:  Check if all the processes are up and running, using command:

Jps

That’s it. The cluster should be up and running with the following 5 processes:

• NameNode
• SecondaryNameNode
• DataNode
• JobTracker
• TaskTracker

If we see all these processes, it means our installation is successful and the cluster is up and running.