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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
504497403 MDU6SXNzdWU1MDQ0OTc0MDM= 3386 add option to open_mfdataset for not using dask sipposip 42270910 closed 0     6 2019-10-09T08:33:53Z 2022-04-09T01:16:21Z 2022-04-09T01:16:21Z NONE      

open_mfdataset only works with dask, whereas with open_dataset one can choose to use dask or not. It would be nice have an option (e.g. use_dask=False) to not use dask.

My special use-case is the following: I use netcdf data as input for a tensorflow/keras application. I use parallel preprocessing threads in Keras. When using dask arrays, it gets complicated because both dask and tensorflow work with threads. I do not need any processing capability of dask/xarray, I only need a lazily loaded array that I can slice, and where the slices are loaded the moment they are accessed. So my application works nice with open_dataset (without defining chunks, and thus not using dask, but the data is accessed slice by slice, so it is never loaded as a whole into memory). However, it would be nice to have the same with open_mfdataset. Right now my workaround is to use netCDF4.MFDataset . (Obviously another workaround would be to concatenate my files into one and use open_dataset) Opening each file separately with open_dataset, and then concatenating them with xr.concat does not work, as this loads the data into memory.

 
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   completed xarray 13221727 issue

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