JupyterLab on multiple nodes?

[simonLeary42]

bc_example_jupyter/manifest.yml

Line 7 in 94d29b4

This app will launch a Jupyter Notebook server on one or more nodes.

bc_example_jupyter/form.yml

Line 49 in 94d29b4

- bc_num_slots

Would JupyterLab work as expected if run on multiple nodes? When the user logs in to their server, which node does the link lead to?

It was my understanding that the only way for processes to work together across multiple nodes is if they use message passing or memory parallelization. Is that not true? Does JupyterLab come with these features?

Looking around, I found that Princeton says that JupyterLab should be run on just one node:
https://researchcomputing.princeton.edu/support/knowledge-base/jupyter

[johrstrom]

I think you're right that you'd need some fancy footwork in the script so that you only launch the notebook on one node.

We do something similar with Jupyter + Spark where we only start the Spark server on one node and we launch workers on the others.

That said - you have me questioning whether that works as expected and if we are indeed starting a notebook on both nodes.