dask-labextension: Failed to connect to Bokeh server Error: Could not open websocket

When I try to use the extension via JupyterHub I get the following websocket error

screen shot 2019-03-07 at 12 30 05 pm

I can confirm that the extension was properly installed:

$ jupyter serverextension list
config dir: /ncar/usr/jupyterhub/20190118/etc/jupyter
    dask_labextension  enabled 
    - Validating...
      dask_labextension 0.3.1 OK
    jupyterlab  enabled 
    - Validating...
      jupyterlab 0.35.4 OK
    nbserverproxy  enabled 
    - Validating...
      nbserverproxy  OK

@jhamman pointed out that he thought the websocket problem was fixed in https://github.com/bokeh/bokeh/issues/6023. I am wondering whether this has to do with dask-labextension or it is something that would need to be addressed upstream in Bokeh.

Ccing @jbaksta as he is the Jhub’s admin, and knows more about the Jhub setup than me.

About this issue

Original URL
State: closed
Created 5 years ago
Comments: 23 (4 by maintainers)

Most upvoted comments

Great! We are still dealing with some difficulties with the newest tornado, but once they are nailed down you should be able to update without difficulties.

ian-r-rose on Apr 10, 2019

I believe I’ve run into this same issue. While I can start a cluster and generate a valid dashboard URL, the graphs in the panes display nothing. It appears that I cannot connect to the Bokeh server.

My setup may be somewhat unusual / complicated. I’m running JupyterLab in a Docker container that is being presented inside of an iframe (I’m using the Domino Data Lab platform). I only wanted to mention this because there may be configuration settings in Domino that might affect the behavior of this extension. I’m honestly just not sure, so I figured I’d raise the question here in case there is an obvious fix / approach to troubleshooting.

dask-jupyterlab-extension

bokeh-error

$ jupyter serverextension list
config dir: /home/ubuntu/.jupyter
    nbserverproxy  enabled
    - Validating...
      nbserverproxy  OK
config dir: /opt/conda/etc/jupyter
    dask_labextension  enabled
    - Validating...
/opt/conda/lib/python3.6/site-packages/dask_labextension/config.py:13: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for fulldetails.
  defaults = yaml.load(f)
      dask_labextension 0.3.1 OK
    ipyparallel.nbextension  enabled
    - Validating...
      ipyparallel.nbextension  OK
    jupyterlab  enabled
    - Validating...
      jupyterlab 0.35.4 OK
    jupyterlab_latex  enabled
    - Validating...
      jupyterlab_latex 0.4.1 OK
    nbdime  enabled
    - Validating...
      nbdime 1.0.5 OK

benjaminsingleton on Apr 9, 2019

Thanks for the update @andersy005 and @jbaksta! If either of you have a minute to describe how to fix a problem like this, a PR to the README.md would be much appreciated.

ian-r-rose on Mar 12, 2019