Loading netcdf file fails

[zklaus]

The attached netcdf file is a minimal example of a cordex file that I could not load with iris-2.0.0.
It loads fine with 1.13.0 and triggers an AttributeError in dask.

Attached is a zip file with:

1. the netcdf file
2. a minimal loading program
3. a log with the stack trace

The stack trace ends in

  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/scitools_iris-2.0.0-py2.7.egg/iris/_lazy_data.py", line 128, in as_concrete_data
    data = np.asanyarray(data.compute())
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/base.py", line 99, in compute
    (result,) = compute(self, traverse=False, **kwargs)
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/base.py", line 206, in compute
    results = get(dsk, keys, **kwargs)
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/threaded.py", line 75, in get
    pack_exception=pack_exception, **kwargs)
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/local.py", line 521, in get_async
    raise_exception(exc, tb)
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/local.py", line 290, in execute_task
    result = _execute_task(task, data)
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/local.py", line 271, in _execute_task
    return func(*args2)
  File "/home/sm_klazi/software/usr/lib/python2.7/site-packages/dask/utils.py", line 688, in __call__
    return getattr(obj, self.method)(*args, **kwargs)
AttributeError: 'NetCDFDataProxy' object has no attribute 'reshape'

Any ideas?

[zklaus]

Further investigation suggests that there was a problem with dask 0.15.3 and scalar AuxCoords.
Updating to dask 0.17.1 solved the issue for me.

[djkirkham]

Thanks for raising this. I've put up a PR here (#2965) and in conda-forge (conda-forge/iris-feedstock#27) to pin the minimum version of Dask to >=0.17.1.

[zklaus]

Works for me. I think this can be closed.