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Clarify what a restart means #966

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merged 4 commits into from
Dec 6, 2023
Merged

Clarify what a restart means #966

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43f867c
Clarify what a restart means
mlucool Sep 1, 2023
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mlucool Sep 1, 2023
76c9a62
Fix review comments
mlucool Sep 6, 2023
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Merge branch 'main' into rip
mlucool Nov 27, 2023
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9 changes: 9 additions & 0 deletions docs/messaging.rst
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Expand Up @@ -1049,6 +1049,15 @@ multiple cases:
IPythonQt client) to force a kernel restart to get a clean kernel without
losing client-side state like history or inlined figures.

Implementation recommendation for starting kernels: A restart should optimally
preserve as many resources outside the kernel as possible (e.g. only restart the
kernel and its subprocesses and not any parent processes). That is, ideally a
restart should be "in-place". For local kernels, there is typically no parent
process so a "hard" restart and an in-place restart are identical whereas for
remote kernels this is not generally the same. As an example, if a remote kernel
is run in a container, during an in-place restart the container may be kept
running and a new kernel process within it would be started.

The client sends a shutdown request to the kernel, and once it receives the
reply message (which is otherwise empty), it can assume that the kernel has
completed shutdown safely. The request is sent on the ``control`` channel.
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