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/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).","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,970245117