Why am I getting hdfs: command not found after creating a new user on CentOS 7?

Описание: Struggling with "hdfs: command not found" on CentOS 7 after creating a new user? Discover the solution to this common issue in our detailed guide.
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Creating a new user on CentOS 7 and encountering the dreaded "hdfs: command not found" error message? You're not alone. Many users have faced this issue, especially when dealing with Hadoop and HDFS. Let's delve into why this happens and how you can resolve it.

Understanding the Issue

When you install Hadoop on CentOS 7, the hdfs commands are typically available to the user who installed Hadoop and set up the environment variables correctly. However, when you create a new user, these environment variables are not automatically configured for this user. As a result, the hdfs command becomes unavailable, leading to the "command not found" error.

The Root Cause

The primary reason behind the "hdfs: command not found" error is the lack of proper environment variable settings for the new user. Specifically, the HADOOP_HOME and PATH environment variables must be set so that the system knows where to find the Hadoop binaries.

Solution Steps

Here's a step-by-step guide to resolving this issue for any new user on CentOS 7:

Locate the Hadoop Installation Directory:
First, identify where Hadoop is installed. This is often something like /usr/local/hadoop.

Edit the User's Profile:
Open the new user's .bashrc or .bash_profile file using a text editor. For instance:

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Add Hadoop Environment Variables:
Append the following lines to the .bashrc or .bash_profile file:

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Source the File:
After saving the changes, you'll need to source the file to apply the changes:

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Verify the Command:
Finally, verify that the hdfs command is now available:

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If everything is set up correctly, you should see the Hadoop version information.

Conclusion

Encountering "hdfs: command not found" after creating a new user on CentOS 7 is a common issue due to unconfigured environment variables. By following the steps outlined above, you can ensure that every new user you create has access to the hdfs commands needed to interact with Hadoop.

By properly setting the HADOOP_HOME and PATH environment variables, you ensure that the Hadoop binaries are accessible, solving the issue efficiently. This quick fix helps maintain productivity without diving deep into more complex Linux configurations.