issues: 1718410975

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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
1718410975 I_kwDOAMm_X85mbN7f 7856 Unrecognized chunk manager dask - must be one of: [] 14371165 closed 0     11 2023-05-21T08:07:57Z 2024-03-27T19:09:18Z 2023-05-24T16:26:20Z MEMBER      

What happened?

I have just updated my development branch of xarray to latest main. No other changes. When using .chunk() on a Variable xarray crashes.

What did you expect to happen?

No crash

Minimal Complete Verifiable Example

```Python import numpy as np import pandas as pd import xarray as xr

t_size = 8000 t = np.arange(t_size) var = xr.Variable(dims=("T",), data=np.random.randn(t_size)).chunk() ```

MVCE confirmation

  • [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [X] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

```Python Traceback (most recent call last):

File "C:\Users\J.W\AppData\Local\Temp\ipykernel_6480\4053253683.py", line 8, in <cell line: 8> var = xr.Variable(dims=("T",), data=np.random.randn(t_size)).chunk()

File "C:\Users\J.W\Documents\GitHub\xarray\xarray\core\variable.py", line 1249, in chunk chunkmanager = guess_chunkmanager(chunked_array_type)

File "C:\Users\J.W\Documents\GitHub\xarray\xarray\core\parallelcompat.py", line 87, in guess_chunkmanager raise ValueError(

ValueError: unrecognized chunk manager dask - must be one of: [] ```

Anything else we need to know?

Likely from #7019.

Environment

xr.show_versions() C:\Users\J.W\anaconda3\envs\xarray-tests\lib\site-packages\_distutils_hack\__init__.py:33: UserWarning: Setuptools is replacing distutils. warnings.warn("Setuptools is replacing distutils.") INSTALLED VERSIONS ------------------ commit: None python: 3.10.6 | packaged by conda-forge | (main, Aug 22 2022, 20:30:19) [MSC v.1929 64 bit (AMD64)] python-bits: 64 OS: Windows OS-release: 10 machine: AMD64 processor: Intel64 Family 6 Model 58 Stepping 9, GenuineIntel byteorder: little LC_ALL: None LANG: en LOCALE: ('Swedish_Sweden', '1252') libhdf5: 1.12.2 libnetcdf: 4.8.1 xarray: 2022.9.1.dev266+gbd01f9cc.d20221006 pandas: 1.5.2 numpy: 1.23.5 scipy: 1.9.3 netCDF4: 1.6.0 pydap: installed h5netcdf: 1.0.2 h5py: 3.7.0 Nio: None zarr: 2.13.2 cftime: 1.6.2 nc_time_axis: 1.4.1 PseudoNetCDF: 3.2.2 iris: 3.3.0 bottleneck: 1.3.5 dask: 2022.9.2 distributed: 2022.9.2 matplotlib: 3.6.2 cartopy: 0.21.0 seaborn: 0.13.0.dev0 numbagg: 0.2.1 fsspec: 2022.10.0 cupy: None pint: 0.19.2 sparse: 0.13.0 flox: 999 numpy_groupies: 0.9.14+22.g19c7601 setuptools: 65.5.1 pip: 22.3.1 conda: None pytest: 7.2.0 mypy: 1.2.0 IPython: 7.33.0 sphinx: 5.3.0 
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   completed 13221727 issue

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