Debugging Issues with YarnSpawner and HDFSCM

If you encounter issues while starting the server with YarnSpawner and HDFSCM, follow these steps to debug:

1. Check the YARN Logs:
   1. Use the application ID to view YARN logs:

yarn logs -applicationId application_1732264491158_0038

2. Examine the JupyterHub Logs.
   • Review the JupyterHub logs located in

/var/log/jupyterhub

- Verify JupyterHub Service Status: Check the status of the JupyterHub service using the following command:

systemctl status jupyterhub.service

3. Inspect the JupyterHub Service Logs.
   1. Use the journalctl command to view recent logs for the JupyterHub service:

journalctl -u jupyterhub -n 100 --no-pager

By following these steps, you should be able to identify and resolve most issues related to server startup with YarnSpawner and HDFSCM.