issues: 340192831

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
340192831 MDU6SXNzdWUzNDAxOTI4MzE= 2278 can't store zarr after open_zarr and isel 11750960 closed 0     10 2018-07-11T10:59:23Z 2019-05-17T14:03:38Z 2018-08-14T03:46:34Z CONTRIBUTOR      

Code Sample, a copy-pastable example if possible

This works fine: ```python nx, ny, nt = 32, 32, 64 ds = xr.Dataset({}, coords={'x':np.arange(nx),'y':np.arange(ny), 't': np.arange(nt)}) ds = ds.assign(v=ds.tnp.cos(np.pi/180./100ds.x)np.cos(np.pi/180./50ds.y)) ds = ds.chunk({'t': 1, 'x': nx/2, 'y': ny/2})

ds.isel(t=0).to_zarr('data_t0.zarr', mode='w') ```

But if I store, reload and select, I cannot store: ds.to_zarr('data.zarr', mode='w') ds = xr.open_zarr('data.zarr') ds.isel(t=0).to_zarr('data_t0.zarr', mode='w')

Error message ends with:

``` ~/.miniconda3/envs/equinox/lib/python3.6/site-packages/xarray/backends/zarr.py in _extract_zarr_variable_encoding(variable, raise_on_invalid) 181 182 chunks = _determine_zarr_chunks(encoding.get('chunks'), variable.chunks, --> 183 variable.ndim) 184 encoding['chunks'] = chunks 185 return encoding

~/.miniconda3/envs/equinox/lib/python3.6/site-packages/xarray/backends/zarr.py in _determine_zarr_chunks(enc_chunks, var_chunks, ndim) 112 raise ValueError("zarr chunks tuple %r must have same length as " 113 "variable.ndim %g" % --> 114 (enc_chunks_tuple, ndim)) 115 116 for x in enc_chunks_tuple:

ValueError: zarr chunks tuple (1, 16, 16) must have same length as variable.ndim 2 ```

Output of xr.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.6.5.final.0 python-bits: 64 OS: Linux OS-release: 3.12.53-60.30-default machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 xarray: 0.10.7 pandas: 0.23.1 numpy: 1.14.2 scipy: 1.1.0 netCDF4: 1.4.0 h5netcdf: 0.6.1 h5py: 2.8.0 Nio: None zarr: 2.2.0 bottleneck: 1.2.1 cyordereddict: None dask: 0.18.1 distributed: 1.22.0 matplotlib: 2.2.2 cartopy: 0.16.0 seaborn: None setuptools: 39.2.0 pip: 10.0.1 conda: None pytest: None IPython: 6.4.0 sphinx: None 
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   completed 13221727 issue

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