Apache Hadoop installation

After the successful installation of the prerequisites, it is now time to start the installation and configuration of Hadoop itself. The following are the steps to get started:

1. Download the stable version of Apache Hadoop from http://www-us.apache.org/dist/hadoop/common/. As of now the stable version available for download is hadoop-2.8.1.

2. Extract the downloaded file by using the following command:

$ tar zxvf hadoop-2.8.1.tar.gz

3. It's time to configure some parameters to run Hadoop. Use the following command to edit the hadoop-env.sh configuration file:

$ gedit etc/hadoop/hadoop-env.sh

4. Look for the following line to set the JAVA_HOME path. Replace /home/hadoopadmin/jdk1.8.0_144/ with the directory where you have installed it. In our case, it will remain the same:

# set to the root of your Java installation
export JAVA_HOME...