4.4.1.1 breaks OPeNDAP on windows and Python 2.7/3.4

[dopplershift]

With 4.4.1.1, I'm having trouble with netCDF accessing OPeNDAP servers; I get the following error:

OSError: NetCDF: Invalid argument

I should note that this only happens on AppVeyor, like: https://ci.appveyor.com/project/Unidata/unidata-python-workshop/build/1.0.201/job/jtxca676p2svxgxh

I can reproduce locally on a windows 7 64 vm with Python 3.4; does not happen with Python 3.5

[ocefpaf]

I had that issue before the update to 4.4.1.1.

See ioos/notebooks_demos#129

Not sure what is going on but some endpoints work fine others return the OSError 😒

[ocefpaf]

I can confirm that pinning to 4.4.0 fixes the problem. Not sure if that is related to netcdf or the packaging in conda-forge.

[rsignell-usgs]

I just built the IOOS3 environment, and this is failing on Windows:

import netCDF4
print(netCDF4.__version__)
url = 'http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ghcncams/air.mon.mean.nc'
nc = netCDF4.Dataset(url)

giving:

1.2.6

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-1-04f7b265af90> in <module>()
      2 print(netCDF4.__version__)
      3 url = 'http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ghcncams/air.mon.mean.nc'
----> 4 nc = netCDF4.Dataset(url)

netCDF4\_netCDF4.pyx in netCDF4._netCDF4.Dataset.__init__ (netCDF4\_netCDF4.c:13973)()

OSError: NetCDF: I/O failure

It works okay on Windows with my IOOS2 environment with older netCDF4 v1.2.4.

[ocefpaf]

I am not sure that is a problem with packaging. I believe it it is a bug in libnetcdf or netCDF4.

What is the libnetcdf version? Try force installing 4.4.0...

[rsignell-usgs]

Here's what my IOOS3 Python 3 env looks like for netcdf:

(ioos3) C:\Users\rsignell\Documents\GitHub>conda list netcdf
# packages in environment at C:\Users\rsignell\AppData\Local\Continuum\Miniconda
3\envs\ioos3:
#
h5netcdf                  0.3.1                    py35_0    conda-forge
libnetcdf                 4.4.0                    vc14_2  [vc14]  conda-forge
netcdf4                   1.2.6               np111py35_0    conda-forge

[ocefpaf]

I will try to debug this but some URLs are OK for me when I downgraded from 4.4.1.1 to 4.4.0...

[ocefpaf]

This was fixed upstream (Unidata/netcdf-c#366) so we need to wait for a new release (or patch or versoin).