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/3633#issuecomment-569417459,https://api.github.com/repos/pydata/xarray/issues/3633,569417459,MDEyOklzc3VlQ29tbWVudDU2OTQxNzQ1OQ==,35968931,2019-12-28T13:29:17Z,2019-12-28T13:29:17Z,MEMBER,"@willirath if the problem is that you don't know the dimensions of the dataset until after you've opened it, you could always open first then chunk afterwards, I think the result is the same:
```python
chunks = {'x': 5}

ds = xr.open_dataset(""example.nc"")

if 'y' in ds.dims:
    chunks['y'] = 1

ds = ds.chunk(chunks=chunks)
```
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