issue_comments: 903347552

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https://github.com/pydata/xarray/pull/5704#issuecomment-903347552 https://api.github.com/repos/pydata/xarray/issues/5704 903347552 IC_kwDOAMm_X8411_1g 1217238 2021-08-22T23:27:45Z 2021-08-22T23:27:45Z MEMBER

The reason why open_mfdataset always uses dask is because otherwise it would not be lazy: the netCDF files would be immediately read into memory as NumPy arrays. open_dataset uses Xarray's own internal lazy indexing machinery, but that machinery doesn't (yet) support lazy concatenation or broadcasting, so it doesn't suffice for open_mfdataset.

We certainly could make a similar change to this, but I would not do so by default. Or I would add support for lazy concatenation into xarray's lazy indexing, and then we could slowly roll out a breaking change (with appropriate FutureWarning, etc).

 
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