Replacing stale connection: ....

[Whadup]

Quite frequently, when I execute a block, I get the above error message in my jupyter notebook and it takes a few seconds until I get a result in sublime.

It is quite annoying, because other times the code is executed instantly.

I'm happy to provide more information if you have any questions.

Here is an exempt of my jupyter log:

[I 09:25:24.222 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:25:24.233 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:25:26.024 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:25:26.035 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[W 09:25:26.959 NotebookApp] Replacing stale connection: bca632cf-1fab-413a-98b3-9897e963815e:423585cf8f6a418ea024e95799345d3d
[I 09:25:31.963 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:25:31.979 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[W 09:27:01.985 NotebookApp] WebSocket ping timeout after 90005 ms.
[I 09:30:00.640 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:30:00.655 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[W 09:30:43.169 NotebookApp] Replacing stale connection: bca632cf-1fab-413a-98b3-9897e963815e:423585cf8f6a418ea024e95799345d3d
[I 09:30:48.177 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:30:48.195 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[W 09:31:01.418 NotebookApp] Replacing stale connection: bca632cf-1fab-413a-98b3-9897e963815e:423585cf8f6a418ea024e95799345d3d
[I 09:31:06.426 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[I 09:31:06.441 NotebookApp] Adapting to protocol v5.1 for kernel bca632cf-1fab-413a-98b3-9897e963815e
[W 09:31:20.283 NotebookApp] Replacing stale connection: bca632cf-1fab-413a-98b3-9897e963815e:423585cf8f6a418ea024e95799345d3d

[ngr-t]

Thank you for reporting an issue! Also sorry for the annoying behavior.

I might found the cause and going to release a minor update to fix it soon. Could you confirm whether the performance issue remains after update?

That was because a WebSocket connection is not closed after communicating with the kernel. It forces Jupyter to replace connection and makes significant performance problem.

[Whadup]

happy to help and test, looking forward to the commit.

[ngr-t]

I've just released the new version with fix. This commit works at least in my hands.

Please let me know whether it works for you.

[Whadup]

Feels more responsive. There are still log messages that read "replacing stale connection".

[ngr-t]

Thank you for confirmation.

I also found sometimes it still happens and I'm trying to find out a way to solve it.

It seems that it happens when we try to create a new WebSocket connection while there is already one.
Hermes plugin runs several threads that requires WebSocket connection to a Jupyter kernel, but I've implemented them insensitively about it. I'm trying to marshal them.

[Whadup]

If i start a long computation that prints output during the computation, I only see the output when all computations are finished. In contrast in a jupyter notebook, the output is shown the moment in happens.

Is there a way to achieve this behaviour in sublime?

[ngr-t]

There must be a way to achieve it within Sublime, but currently this plugin can't deal with.

[blaggacao]

I installed today via ST3 package manager and I have slightly different log:

[I 13:05:25.545 NotebookApp] Restoring connection for bb1384fb-55f5-4a11-a06f-544359368d9e:81a57ed174144d239abf5a2deed0368f
[W 13:06:12.341 NotebookApp] Replacing stale connection: bb1384fb-55f5-4a11-a06f-544359368d9e:81a57ed174144d239abf5a2deed0368f
[I 13:06:17.343 NotebookApp] Starting buffering for bb1384fb-55f5-4a11-a06f-544359368d9e:81a57ed174144d239abf5a2deed0368f
[I 13:06:17.344 NotebookApp] Adapting to protocol v5.1 for kernel bb1384fb-55f5-4a11-a06f-544359368d9e

[blaggacao]

After closing the web browser session, I only see:

[W 13:11:16.944 NotebookApp] WebSocket ping timeout after 90000 ms.
[I 13:11:21.948 NotebookApp] Starting buffering for bb1384fb-55f5-4a11-a06f-544359368d9e:81a57ed174144d239abf5a2deed0368f
[I 13:11:31.885 NotebookApp] Adapting to protocol v5.1 for kernel bb1384fb-55f5-4a11-a06f-544359368d9e
[I 13:11:31.887 NotebookApp] Restoring connection for bb1384fb-55f5-4a11-a06f-544359368d9e:81a57ed174144d239abf5a2deed0368f

Sidenote, I just used the same standard token when you do jupyter notebook list...
No configuration a part from the standard config file generation, whatsoever...

[ngr-t]

@blaggacao Thanks. Maybe the same issue.

[ngr-t]

New version of Hermes (v0.5.0) doesn't use WebSocket, so this issue should be solved.

[pykong]

Potentially solved. Stale. Closing.