Execution doesn't resolve unless the file is saved

[willwhitney]

#52

[willwhitney]

I can't reproduce this — can anyone give me concrete steps?

[n-riesco]

I've just checked on a machine with:
IPython 3.0.0
Atom 0.207.0-2337254

and followed the steps:

• Open Atom (no tabs)
• Open a Python file, test.py, that contains:
  print "Hello, Jupyter!"
• Position the cursor at the end of the line and press ctrl-alt-enter
• The spinner doesn't stop
• Open a Javascript file, test.js, that contains:
  console.log("Hello, Jupyter!");
• Position the cursor at the end of the line and press ctrl-alt-enter
• The spinner doesn't stop
• Click on the tab for test.py and now it shows
  Hello, Jupyter!
• Click on the tab for test.js
• Press ctrl-s, and the spinner stops and shows:
  Hello, Jupyter!
  undefine

[willwhitney]

OK, this definitely doesn't repro on Mac. Can I get you to help track down what's going on?

Here are the logs I see when I follow the steps through running the Python code:

What looks different?

[n-riesco]

I get some syntax errors in kernel-manager.coffee (I'm using v0.4.0).

Edit: It looks like it dropped my email attachment. Here's the screenshot:

[willwhitney]

Sorry, lost track of this issue. The line causing the error looks like it must be:

languageMappings = JSON.parse atom.config.get('Hydrogen.languageMappings')

What do you have in the the "language mappings" field in the settings?

[n-riesco]

This is what I get in the console, before pressing ctrl-alt-enter:

atom.config.get("Hydrogen.languageMappings")
<- undefined

after pressing ctrl-alt-enter:

atom.config.get("Hydrogen.languageMappings")
<- "{}"

[willwhitney]

I think Atom must have a race condition with getting that set (maybe just on some platforms?).

I'm already doing a check for that, but I'll be a little more careful about it. I'm not sure this is the issue, but we can see if it helps.

Update pushed.

[n-riesco]

I'm not running the latest atom. I will update and let you know (although not today).

[willwhitney]

Cool, no worries. Thanks for the help!

On Thu, Jul 2, 2015 at 4:41 PM Nicolas Riesco notifications@github.com
wrote:

I'm not running the latest atom. I will update and let you know (although
not today).

—
Reply to this email directly or view it on GitHub
#53 (comment)
.

[n-riesco]

Finally, I got around testing this issue again. I followed the steps described here; this time using the latest versions:

• atom v1.0.8
• hydrogen v0.4.4
• jupyter v4.0.4
• ipython v4.0.0
• ijavascript v5.0.5

The problem is still present, but I've also noticed that the execution also resolves:

• if I switch tabs
• or if the folder panel gets updated (e.g. by creating a file using the command line).

I would like to help debug this issue, but I'm not familiar with atom. How do you usually go about debugging issues in hydrogen?

[n-riesco]

OK, this is how far I've got at the moment:

1. Hydrogen launches the kernel
2. Hydrogen invokes kernel.execute
3. I've confirmed that, at this point, the kernel process:
   • is running
   • receives the execute_request
   • and sends back the expected replies
4. Despite the kernel having already replied, none of the socket listeners set up by Hydrogen gets invoked.

I don't understand the reason, but it's like if the V8 event loop was paused. The event loop starts working as usual:

• if I save the file,
• or if I switch to another tab and then switch back
• or if I run setImmediate(function{}) in the Javascript console.

[essicolo]

Hydrogen works fine with Python, but the spinner lasts forever with R. I'm on Windows 10 with Atom 1.12.6. I have installed version 0.7 of the IRkernel with conda. I have added R to the system path, but I'm not familiar with this. Maybe I did it wrong:

C:\Program Files\R\R-3.3.2\bin\x64

No error message in Atom. Just Hydrogen telling me on start that the Python and R kernels were updated.

[n-riesco]

@essicolo Since the issue is only with the R kernel, please could you open a new issue? Also could you include a screenshot of the log messages in the dev console (shift-ctrl-i) when the spinner appears?

[n-riesco]

I'm closing this issue, since it hasn't been seen recently and the last last time that was seen we were using the old zmq.