Error: redis failed to refresh slots cache

What's Causing This Error

The 'redis failed to refresh slots cache' error typically occurs when there is an issue with the Redis cluster. During the initialization of a Redis cluster, it fetches and caches slot information from the master node. However, if any nodes in the cluster fail or if there are network connectivity issues, the slots cache can become outdated or invalid, leading to this error message.

In some instances, users have reported encountering this error even when the cache appears to be functioning correctly, such as when using specific tools or extensions like VS Code.

Solution - Here's How To Resolve It

To resolve the 'redis failed to refresh slots cache' error, you can try the following solutions:

1. Restart the Redis cluster: Sometimes, restarting the Redis cluster can help refresh the slots cache and fix the error. You can do this by stopping all the Redis nodes and then starting them again.

2. Reset the slots cache manually: If restarting the cluster doesn't work, you can try resetting the slots cache manually. Use the command cluster forget <node-id> to remove incorrect node information from the cluster. Then, run the cluster meet <ip> <port> command to reintroduce the correct node information.

3. Check network connectivity: Ensure that there are no network issues between the nodes in the cluster. Verify that all nodes are reachable and that no firewalls are blocking communication.

4. Upgrade Redis version: Using an older version of Redis might cause compatibility issues. Upgrading to the latest stable release can improve error handling and provide better diagnostic tools.

5. Tool-specific troubleshooting: If you encounter this error while using a specific tool or extension, such as a VS Code extension for Redis:

   • Ensure the tool or extension is up-to-date.
   • Consult the tool's documentation or support resources for any known issues or additional troubleshooting steps.
   • Consider reinstalling the extension or checking for any configuration settings that might affect its operation.