issue_comments: 685928460

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https://github.com/pydata/xarray/issues/4309#issuecomment-685928460 https://api.github.com/repos/pydata/xarray/issues/4309 685928460 MDEyOklzc3VlQ29tbWVudDY4NTkyODQ2MA== 226037 2020-09-02T18:46:58Z 2020-09-02T18:55:52Z MEMBER

@shoyer and @jhamman, I'm looking into the write support and if we let a backend return a xr.Dataset, as agreed, we lose the ability to support in-place change of a file, no update of attributes or mode='a', unless the backend has a unambiguous way to identify persistent xr.Dataset.

I'm not sure what options for in-place change are supported, but I see at least mode='a' for zarr. Let's discuss this tomorrow.

 
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