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  • tinaok · 1 ✖

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  • can't store zarr after open_zarr and isel · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
493431087 https://github.com/pydata/xarray/issues/2278#issuecomment-493431087 https://api.github.com/repos/pydata/xarray/issues/2278 MDEyOklzc3VlQ29tbWVudDQ5MzQzMTA4Nw== tinaok 46813815 2019-05-17T12:11:21Z 2019-05-17T14:03:38Z NONE

Hi, second test case indicated by Apatlpo on on 12 Jul 2018, brakes ```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.to_zarr('data.zarr', mode='w')

```

python ds = xr.open_zarr('data.zarr') ds = ds.chunk({'t': nt, 'x': nx/4, 'y': ny/4}) ds.to_zarr('data_rechunked.zarr', mode='w')

Err message is following . ValueError: Final chunk of Zarr array must be the same size or smaller than the first. The specified Zarr chunk encoding is (1, 16, 16), but (64,) in variable Dask chunks ((64,), (8, 8, 8, 8), (8, 8, 8, 8)) is incompatible. Consider rechunking using `chunk()

(if I add del ds.v.encoding['chunks'] as follows, it does not break) 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.t*np.cos(np.pi/180./100*ds.x)*np.cos(np.pi/180./50*ds.y)) ds = ds.chunk({'t': 1, 'x': nx/2, 'y': ny/2}) ds.to_zarr('data.zarr', mode='w') ds = xr.open_zarr('data.zarr') del ds.v.encoding['chunks'] ds = ds.chunk({'t': nt, 'x': nx/4, 'y': ny/4}) ds.to_zarr('data_rechunked.zarr', mode='w')

 
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   can't store zarr after open_zarr and isel 340192831

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