Hi Jason,

It seems there is already one for Jupyterlab: 
https://github.com/jupyterlab/jupyterlab/issues/4040, FYI.

Thanks,
Song

On Friday, May 3, 2019 at 2:08:51 AM UTC+8, Jason Grout wrote:
>
> The decision of if and when to launch a kernel is a frontend decision, not 
> a backend decision. That's why it should also be a JupyterLab issue.
>
> Thanks for finding that Jupyter notebook issue. If you could reference 
> that, that would help tie in the discussion.
>
> Thanks,
>
>
> Jason
>
>
> On Thu, May 2, 2019 at 1:53 PM Song Liu <[email protected] <javascript:>> 
> wrote:
>
>> Yes, I can.
>>
>> But it seems that there is already a same issue in jupyter/notebook 
>> project (https://github.com/jupyter/notebook/issues/3170), I understand 
>> jupyterlab is using the jupyter/notebook as its backend, or jupyterlab will 
>> rewrite not only the  frontend but also the backend ?
>>
>> On Wednesday, May 1, 2019 at 6:48:29 AM UTC+8, Jason Grout wrote:
>>>
>>> On Tue, Apr 30, 2019 at 4:36 PM Song Liu <[email protected]> wrote:
>>>
>>>> Yes, this is the kernel and Jupyter Server separation solution for my 
>>>> requirement.
>>>>
>>>> So what is the schedule for this kernel launching behavior change ? 
>>>> where could access this kind of discussion ?
>>>>
>>>>
>>> The current state is:
>>>
>>> 1. We discussed this when implementing JupyterLab, and decided to go 
>>> with the classic notebook behavior for compatibility.
>>> 2. We are releasing 1.0 shortly (in the next several months?), and we 
>>> (most likely) wouldn't change this behavior at this point for 1.0.
>>> 3. We can take up this discussion after releasing 1.0, especially if 
>>> someone volunteers to do the work for it.
>>>
>>> Do you want to open an issue for "Launch a kernel for notebook only when 
>>> needed, not at open" in the jupyterlab repo at 
>>> https://github.com/jupyterlab/jupyterlab/issues/new? That will help us 
>>> keep track of this request.
>>>
>>> Thanks,
>>>
>>> Jason
>>>
>>>
>>>
>>> -- 
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