ipcluster start fails with TraitError

[michaelaye]

Using:

(stable) └─( 2 ) ❱❱❱ conda list ipy                                            +9557 0:38 ❰─┘
# packages in environment at /Users/klay6683/miniconda3/envs/stable:
#
# Name                    Version                   Build  Channel
ipykernel                 4.8.2                    py36_0    conda-forge
ipyparallel               6.0.2                    py36_0    conda-forge
ipython                   6.2.1                    py36_1    conda-forge
ipython_genutils          0.2.0                    py36_0    conda-forge

I try:

ipcluster start -n 4

and get

traitlets.traitlets.TraitError: The 'loop' trait of an IPClusterStart instance must be a ZMQIOLoop, but a value of class 'tornado.platform.asyncio.AsyncIOMainLoop' (i.e. <tornado.platform.asyncio.AsyncIOMainLoop object at 0x1125d3f60>) was specified.

Is maybe my conda env broken? I'm surprised nobody else would have had this issue?

Here's some more infos:

(stable) └─( 2 ) ❱❱❱ conda list traitlets                                      +9560 0:41 ❰─┘
# packages in environment at /Users/klay6683/miniconda3/envs/stable:
#
# Name                    Version                   Build  Channel
traitlets                 4.3.2                    py36_0    conda-forge

(stable) └─( 2 ) ❱❱❱ conda info                                                +9562 0:42 ❰─┘

     active environment : stable
    active env location : /Users/klay6683/miniconda3/envs/stable
            shell level : 1
       user config file : /Users/klay6683/.condarc
 populated config files : /Users/klay6683/miniconda3/.condarc
                          /Users/klay6683/.condarc
          conda version : 4.5.0
    conda-build version : not installed
         python version : 3.6.3.final.0
       base environment : /Users/klay6683/miniconda3  (writable)
           channel URLs : https://conda.anaconda.org/conda-forge/osx-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://conda.anaconda.org/conda-canary/osx-64
                          https://conda.anaconda.org/conda-canary/noarch
                          https://repo.anaconda.com/pkgs/main/osx-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/free/osx-64
                          https://repo.anaconda.com/pkgs/free/noarch
                          https://repo.anaconda.com/pkgs/r/osx-64
                          https://repo.anaconda.com/pkgs/r/noarch
                          https://repo.anaconda.com/pkgs/pro/osx-64
                          https://repo.anaconda.com/pkgs/pro/noarch
                          https://conda.anaconda.org/NSIDC/osx-64
                          https://conda.anaconda.org/NSIDC/noarch
          package cache : /Users/klay6683/miniconda3/pkgs
                          /Users/klay6683/.conda/pkgs
       envs directories : /Users/klay6683/miniconda3/envs
                          /Users/klay6683/.conda/envs
               platform : osx-64
             user-agent : conda/4.5.0 requests/2.18.4 CPython/3.6.3 Darwin/16.7.0 OSX/10.12.6
                UID:GID : 273771:2260
             netrc file : None
           offline mode : False

[minrk]

I think I might need to make a release of ipyparallel with tornado 5 fixes. In the meantime, you can install tornado 4.5.

[michaelaye]

Thanks, worked!

[michaelaye]

This isn't fixed in tornado 5.02, right? Just wondering...

[michaelaye]

Can it be, that if I just install tornado 4.5 on top of all other packages being current, that I don't get an update of the results.progress attribute that I get back from a load_balanced_view().map_async() ?

[michaelaye]

No, but I had to restart the notebook after downgrading tornado, otherwise the communication wouldn't work.

[minrk]

This should be fixed with more recent versions of pyzmq, ipyparallel

[yadiannaandy]

how do it