issue_comments: 998764799

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https://github.com/pydata/xarray/issues/4738#issuecomment-998764799 https://api.github.com/repos/pydata/xarray/issues/4738 998764799 IC_kwDOAMm_X847h_D_ 13301940 2021-12-21T13:08:21Z 2021-12-21T13:09:01Z MEMBER

@andersy005 if you can rely on dask always being present, dask.base.tokenize(xarray_object) will do what you want.

@dcherian, I just realized that dask.base.tokenize deosn't return a deterministic token for xarray objects:

```python In [2]: import dask, xarray as xr

In [3]: ds = xr.tutorial.open_dataset('rasm')

In [4]: dask.base.tokenize(ds) == dask.base.tokenize(ds) Out[4]: False

In [5]: dask.base.tokenize(ds) == dask.base.tokenize(ds) Out[5]: False ```

The issue appears to be caused by the coordinates which are used in __dask_tokenize__

https://github.com/pydata/xarray/blob/dbc02d4e51fe404e8b61656f2089efadbf99de28/xarray/core/dataarray.py#L870-L873

python In [8]: dask.base.tokenize(ds.Tair.data) == dask.base.tokenize(ds.Tair.data) Out[8]: True

python In [16]: dask.base.tokenize(ds.Tair._coords) == dask.base.tokenize(ds.Tair._coords) Out[16]: False

Is this the expected behavior or am I missing something? 

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