issue_comments: 663790991

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https://github.com/pydata/xarray/issues/4240#issuecomment-663790991 https://api.github.com/repos/pydata/xarray/issues/4240 663790991 MDEyOklzc3VlQ29tbWVudDY2Mzc5MDk5MQ== 1217238 2020-07-25T01:33:36Z 2020-07-25T01:33:36Z MEMBER

Thanks for the clear example!

This happens dues to xarray's caching logic for files: https://github.com/pydata/xarray/blob/b1c7e315e8a18e86c5751a0aa9024d41a42ca5e8/xarray/backends/file_manager.py#L50-L76

This means that when you open the same filename, xarray doesn't actually reopen the file from disk -- instead it points to the same file object already cached in memory.

I can see why this could be confusing. We do need this caching logic for files opened from the same backends.*DataStore class, but this could include some sort of unique identifier (i.e., from uuid) to ensure each separate call to xr.open_dataset results in a separately cached/opened file object: https://github.com/pydata/xarray/blob/b1c7e315e8a18e86c5751a0aa9024d41a42ca5e8/xarray/backends/netCDF4_.py#L355-L357

 
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