1572379 : Jupyterhub Probleme

Created: 2026-01-29T17:22:55Z - current status: new

Here is the anonymized and summarized report:

Summary of Issue

A user reports persistent problems with JupyterHub on the Maxwell cluster: - Slow performance: The interface opens very slowly. - UI issues: Tabs do not display correctly, even if they are open. - Kernel loading failures: Kernels fail to load. - File load errors: Every open notebook tab shows a "File load error." - Attempted fixes: Logging out/in, closing all tabs, and restarting the server did not resolve the issue.

Possible Causes & Solution

Based on the provided context, the issue may stem from: 1. Incompatible Python modules in the user’s ~/.local directory, which can break JupyterHub functionality (e.g., conflicting versions of pydantic, tornado, or ipywidgets). - Solution: Avoid installing modules in ~/.local. Instead, use a virtual environment or conda environment to manage dependencies. - If the problem persists, try: - Clearing the ~/.local directory (backup first). - Restarting the Jupyter server after ensuring no conflicting modules are present.

  1. Server-side issues (e.g., resource constraints or misconfigured kernels).

  2. Solution: Check if the problem is global by contacting the Maxwell support team (maxwell.service@desy.de). If isolated, the user may need to:

  3. Browser/cache issues:

  4. Solution: Clear browser cache or try a different browser/incognito mode.

Next Steps

  • If the issue is user-specific, follow the steps above to clean up local environments or reconfigure kernels.
  • If the problem persists globally, contact maxwell.service@desy.de for cluster-wide diagnostics.

Sources Used

  1. Creating Jupyter Kernels
  2. JupyterHub on Maxwell → Kernels
  3. Stopping a Jupyter Server