Jupyter Notebook KernelRestarter restarts and then Notebook Killed

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On a linux machine I had a Jupyter Notebook running for hours.

When I returned, in the browser I saw this: enter image description here

Thus, I went to the terminal where I had launched the Notebook and I saw:

[I 20:23:40.243 NotebookApp] Saving file at /somedir/notebook.ipynb
[I 20:24:24.754 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
kernel 860905d3-ee34-4e22-8c9d-e8faecec1f5c restarted
[I 20:24:32.415 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
kernel 9ebb0a05-9328-4506-b5e2-df7789e57857 restarted
[I 20:25:05.478 NotebookApp] Saving file at /somedir/notebook.ipynb
[I 20:25:40.632 NotebookApp] Saving file at /somedir/notebook.ipynb
Killed
(condaEnvName) hostname:username$ [IPKernelApp] WARNING | Parent appears to have exited, shutting down.
[IPKernelApp] WARNING | Parent appears to have exited, shutting down.
[IPKernelApp] WARNING | Parent appears to have exited, shutting down.
[IPKernelApp] WARNING | Parent appears to have exited, shutting down.

Any idea what happened?

What caused (or could have caused) the KernelRestarter to kickoff?

What is the Killed line and is it related to the KernelRestarter?

Who is the "Parent" which "appears to have excited"?

jupyter-notebook python
1 Answers

It is caused by opening too many files in new tab and trying to close these files with only closing browser tabs. To close a file which is opened in a new tab, click "File" -> "Close and Halt". This closes the file in a proper way, the file cannot run in background and cause to this error.

user_117345950
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