issue_comments: 377572708

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https://github.com/pydata/xarray/issues/2029#issuecomment-377572708 https://api.github.com/repos/pydata/xarray/issues/2029 377572708 MDEyOklzc3VlQ29tbWVudDM3NzU3MjcwOA== 1217238 2018-03-30T17:10:12Z 2018-03-30T17:10:12Z MEMBER

The problem is that xarray is that when you open up a dataset, xarray does lazy loading of the data from the source file. This lazy loading breaks when you override the source file. As a user, the work around is to always load files entirely from disk, e.g., by calling .load(), or to not attempt to override existing files.

I'm not quite sure how we should improve this, but this does certainly come up with some frequency, especially for new users. A friendlier warning/error would be nice, but I'm not sure how to detect this behavior in general (this information is not currently very accessible).

We could potentially always write to temporary files in to_netcdf() and then rename in a final step after writing the data. As a bonus, this results in atomic writes on most platforms.

 
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