Hadoop_Home

HADOOP_HOME is an environment variable that points to the directory where the Hadoop software is installed on your system. It is used by Hadoop and other Hadoop-related tools to locate the Hadoop installation directory. Setting up HADOOP_HOME correctly is essential for running Hadoop and its associated commands and applications.

Here are the typical steps for setting up HADOOP_HOME:

1. Install Hadoop: First, you need to download and install Hadoop on your system. You can obtain the Hadoop distribution from the official Apache Hadoop website or other sources.

2. Extract the Hadoop Archive: After downloading the Hadoop distribution, extract it to a directory of your choice. This directory will be your Hadoop installation directory.

3. Set HADOOP_HOME Environment Variable:

   • On Unix/Linux:

     • Open a terminal.
     • Edit your shell’s profile configuration file (e.g., ~/.bashrc or ~/.bash_profile) using a text editor (e.g., nano, vim, or gedit).
     • Add the following line at the end of the profile file, replacing /path/to/hadoop with the actual path where you installed Hadoop:
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     export HADOOP_HOME=/path/to/hadoop
     • Save the file and exit the text editor.
     • To apply the changes to your current terminal session, run:
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     source ~/.bashrc # or source ~/.bash_profile

   • On Windows:

     • Open the Windows Control Panel.
     • Navigate to System and Security > System.
     • Click on “Advanced system settings” on the left.
     • In the System Properties window, click the “Environment Variables” button.
     • Under the “System variables” section, click “New” to add a new environment variable.
     • Set the variable name to HADOOP_HOME and the variable value to the path where you installed Hadoop (e.g., C:\hadoop).
     • Click “OK” to save the new environment variable.
     • Click “OK” again to close the System Properties window.

4. Verify HADOOP_HOME: To verify that HADOOP_HOME is correctly set, you can open a new terminal or command prompt and run the following command:

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   echo $HADOOP_HOME # On Unix/Linux

   or

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   echo %HADOOP_HOME% # On Windows