html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/2278#issuecomment-493431087,https://api.github.com/repos/pydata/xarray/issues/2278,493431087,MDEyOklzc3VlQ29tbWVudDQ5MzQzMTA4Nw==,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.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')

```

```
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')
```","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,340192831