JupyterLab 3.0 strategy

[manics]

Proposed change

Update to JupyterLab 3.0 when it's released. Switch default from notebook to the planned lab classic notebook mode view.

Alternative options

• Upgrade to JupyterLab 3.0 but keep the default jupyter-notebook view.

Who would use this feature?

Hopefully everyone! This is a follow-on from #724
Related issues:

• JupyterLab as the Default? jupyterhub#2634
• JupyterLab - the default? zero-to-jupyterhub-k8s#776

How much effort will adding it take?

• Upgrading to JupyterLab 3.0 will require extensions to be updated, but assuming there are no major API changes this should be straightforward and just require bumping versions of dependencies.
• Switching the default interface will require investigation since the URL needs to change to /doc.

Who can do this work?

• Anyone can follow the instructions for updating conda packages.
• Changing the default requires knowledge of the repo2docker codebase

Required changes (please edit and update as required)

• Update JupyterLab
• Update jupyter-offlinenotebook (pip installable for JupyterLab 3)
• Switch from nbresuse to jupyter-resource-usage
• Switch default URL from /tree to either /doc or lab

[SylvainCorlay]

Update to JupyterLab 3.0 will hopefully reduce a lot the build time for extensions and all, thanks to the webpack module federation.

[manics]

Yes, I'm looking forward to it 😄 . From a repo2docker point of view we need to wait until enough current lab extensions have been updated so we don't break too many repositories.

[jtpio]

There is now some documentation about updating extensions to be compatible with 3.x, as well as using the new extension distribution system (with pip and conda):

https://jupyterlab.readthedocs.io/en/latest/developer/extension_migration_2_3.html

[jtpio]

Adding a new TODO item, now that jupyter-resource-usage has been published to PyPI:

• Switch from nbresuse to jupyter-resource-usage

The package includes a prebuilt extension for JupyterLab 3.0 that displays the memory usage as a status bar item. It was originally part of the JupyterLab code base but has now been moved to jupyter-resource-usage (see jupyterlab/jupyterlab#9386 and jupyter-server/jupyter-resource-usage#69 for more info).

[manics]

@jtpio Thanks for the note about jupyter-resource-usage, I've copied it to the main description

On a separate note, I've noticed the latest JupyterLab no longer runs on mybinder, going to /lab results in a 404:
https://mybinder.org/v2/gist/manics/922d4e88fefc6d38fccea8cd2097bc28/HEAD?urlpath=%2Flab

[jtpio]

On a separate note, I've noticed the latest JupyterLab no longer runs on mybinder, going to /lab results in a 404:

It's probably related to jupyter server now requiring tornado>=6.1. It should normally be fixed with jupyterlab==3.0.0rc14 (more info in jupyterlab/jupyterlab#9453 and linked issues and PRs).