Too many ipyleaflet layers fail to render

[yudai-nkt]

I noticed that notebooks with too many ipyleaflet layers cannot be properly rendered with Voila. Those notebooks are rendered on mybinder.org, so this could be a problem of my computer. That being said, I'd be happy if notebooks that can be rendered with JupyterLab locally can be rendered with Voila as well, or at least Voila issues a warning saying some widgets are not rendered.

Below is a table of results with a reproducible example and GIFs capturing the results on my local end.

	JupyterLab	Voila
my end	success	fail
online (nbviewer or binder)	success	success

JupyterLab:

Voila

This issue might be a duplicate of #534, but I'm afraid I'm not quite sure. Feel free to close if that's the case.

[davidbrochart]

I can reproduce locally, and I get a TimeoutError: Cell execution timed out in the terminal. The default timeout value is 30s, but you can change it:

$ voila --help-all
...
--VoilaExecutePreprocessor.timeout=<Int>
    Default: 30
    The time to wait (in seconds) for output from executions. If a cell
    execution takes longer, an exception (TimeoutError on python 3+,
    RuntimeError on python 2) is raised.
    `None` or `-1` will disable the timeout. If `timeout_func` is set, it
    overrides `timeout`.
...

[davidbrochart]

Or if you want to cancel the execution a cell if it takes too long, use this option:

--VoilaExecutePreprocessor.interrupt_on_timeout=True

[tonywang531]

I have tried to set the timeout value to 99999 before and it still works (I put some machine learning data that takes like 2 hours to compute). Although it is definitely not user friendly to wait for 2 hours before getting an useful output.

[raybellwaves]

believe VoilaExecutePreprocessor.interrupt_on_timeout is now named VoilaExecutor.timeout