Do You Make These Mistakes?

Prerequisites Hadoop requires a working Java 1.5+ (aka Java 5) installation. However, using Java 1.6/1.7 (aka Java 6/7) is recommended for running Hadoop. Please refer to jdk installation instructions here. Dedicated user for Hadoop system A dedicated Hadoop user will help Hadoop installation from other software applications and user accounts running on the same machine. umasarath@ubuntu:~$ sudo addgroup hadoop umasarath@ubuntu:~$ sudo adduser --ingroup hadoop hduser The above two commands will add "hduser" user and "hadoop" group. Hadoop Installation Download Hadoop from the Apache Download Mirrors and extract the contents of the Hadoop package to a location of your choice. The folder I chosen was the hduser home folder. Extract the downloaded file in /home/hduser folder and make sure the file should be extracted in hduser login. hduser@ubuntu:~$ sudo tar xzf hadoop-1.2.1.tar.gz hduser@ubuntu:~$ sudo mv hadoop-1.2.1 hadoop Configuratio

Installing Open JDK from Command Prompt Issue command apt-get install openjdk-7-jdk to install JDK7. Ubuntu will auto download JDK and start the installation, wait a few minutes for the downloading process. umasarath @ ubuntu:~ $ sudo apt-get install openjdk- 7 -jdk Verifying Java after installation Ubuntu installs JDK at /usr/lib/jvm/jdk-folder, for example /usr/lib/jvm/java-7-openjdk-amd64/. In additional, Ubuntu also puts the JDK bin folder in the system path, via symbolic link.  For example, /usr/bin/java. To verify if JDK is installed properly, type java -version in the command prompt. umasarath@ubuntu:~$java-version java version "1.7.0_25" OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.12.04.2) OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode) umasarath@ubuntu:/usr/lib/jvm/java-7-openjdk-amd64/bin$ Post-Installation Setup To configure JAVA_HOME in system path each time the terminal is started, you can append the expor