How to Resolve Cassandra Installation Issues on MacOS

A guide to troubleshooting Cassandra installation problems on MacOS, including solutions for common port conflicts.
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Troubleshooting Cassandra Installation Issues on MacOS

Are you facing issues during the installation of Cassandra 3.11 on MacOS, especially if you're using M1 chips? If you've followed the official installation guide using tarball installation but encountered errors while attempting to run Cassandra, you're not alone. This guide will help you understand and resolve the most common issues associated with installing Cassandra on MacOS.

Understanding the Problem

When you try to launch Cassandra using the command:

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You might receive an error message similar to:

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This error indicates that the default port used by Cassandra for JMX (Java Management Extensions) is already being utilized by another service on your Mac. In this case, it’s necessary to either stop that service or change the port Cassandra is attempting to use.

Step-by-Step Solution

Here are two straightforward solutions to resolve this issue:

1. Identify and Stop the Conflicting Service

Check Active Services: Use the terminal to identify which service is using the JMX port (7199). You can run the following command:

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This command will provide details about the service utilizing the port.

Terminate the Service: If you identify the service that is blocking the port and it is safe to terminate it, you can do so by running:

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Replace <PID> with the Process ID obtained from the previous command.

2. Change the JMX Port for Cassandra

If you prefer not to shut down the conflicting service or cannot identify it, you can change Cassandra's JMX port.

Edit the Configuration: Open the cassandra-env.sh file located in the conf/ directory of your Cassandra installation.

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Locate the JMX_PORT Setting: Look for a line that sets the JMX_PORT. It usually looks like this:

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(The # signifies that the line is commented out.)

Uncomment and Change the Port: Uncomment this line (remove the # ) and change the port to a free one, for example:

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Save and Exit: Save the changes and exit the text editor.

3. Restart Cassandra

Once you have either terminated the conflicting service or changed the JMX port, try to run Cassandra again with the same command:

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Conclusion

We hope this guide helps you resolve your issues with installing Cassandra on MacOS. Port conflicts are a common obstacle when setting up services, and knowing how to diagnose and address them can save you time and frustration. Always remember to check which ports are in use on your system, and feel free to change default ports when necessary. Happy coding!

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