Where does jupyterlab get state about previous sessions when it starts up?

[Christian Schafmeister]

Hello,

Does jupyterlab use cookies or some file on my system to figure out what sessions it starts when jupyterlab starts up?

We have developed a jupyter kernel in Common Lisp - we are using bleeding edge jupyterlab 0.34.

If I don't shut down every kernel and close every notebook before shutting down jupyterlab then the next time I start up jupyterlab the notebooks will be open and sessions will be running and everything will be confused. I'm trying to get a handle on where this startup behavior is coming from so I can decide how I want to handle things.

Best,

Christian Schafmeister

Professor, Chemistry Department

Temple University

[A. Darian]

Hello!

JupyterLab stores the layout state of the application so it can re-open in the same layout that it last used. This behavior is used to support things like refreshing your browser and not losing your state and is also a fairly common behavior among some text editors (e.g. Sublime Text). Workspaces are documented here:

https://jupyterlab.readthedocs.io/en/stable/user/urls.html#managing-workspaces

In addition to the `reset` functionality denoted in the documentation, there is also a "Reset Application State" command in the command palette that will clear your workspace if you wish to abandon it.

If you run the command `jupyter lab paths`, you can find the folder where your workspace data resides.

I hope that helps!

-Darian

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[Christian Schafmeister]

That helps enormously - thank you very much!

I will explore that.