What is your issue?

This was raised about a year ago but still seems to be unresolved, so I'm hoping this will bring attention back to the issue. (https://github.com/pydata/xarray/issues/5488)

Data: dropbox sharing link Description: This folder contains 2 files each containing 1 day's worth of 1kmx1km gridded precipitation rate data from the National Severe Storms Laboratory. Each is about a gig (sorry they're so big, but it's what I'm working with!) Code: ```python import xarray as xr

f_in_ncs = "data/" f_in_nc = "data/20190520.nc"

%% works

ds = xr.open_dataset(f_in_nc, chunks={'outlat':3500, 'outlon':7000, 'time':50})

%% doesn't work

mf_ds = xr.open_mfdataset(f_in_ncs, concat_dim = "time", chunks={'outlat':3500, 'outlon':7000, 'time':50}, combine = "nested", engine = 'netcdf4') **Error**:Python Output exceeds the size limit. Open the full output data in a text editor

---

KeyError Traceback (most recent call last) File c:\Users\Daniel\anaconda3\envs\mrms\lib\site-packages\xarray\backends\file_manager.py:199, in CachingFileManager._acquire_with_cache_info(self, needs_lock) 198 try: --> 199 file = self._cache[self._key] 200 except KeyError:

File c:\Users\Daniel\anaconda3\envs\mrms\lib\site-packages\xarray\backends\lru_cache.py:53, in LRUCache.getitem(self, key) 52 with self._lock: ---> 53 value = self._cache[key] 54 self._cache.move_to_end(key)

KeyError: [<class 'netCDF4._netCDF4.Dataset'>, ('d:\mrms_processing\_reprex\2022-7-18_open_mfdataset\data',), 'r', (('clobber', True), ('diskless', False), ('format', 'NETCDF4'), ('persist', False))]

During handling of the above exception, another exception occurred:

PermissionError Traceback (most recent call last) Input In [4], in <cell line: 5>() 1 import xarray as xr 3 f_in_ncs = "data/" ----> 5 ds = xr.open_mfdataset(f_in_ncs, concat_dim = "time", 6 chunks={'outlat':3500, 'outlon':7000, 'time':50}, 7 combine = "nested", engine = 'netcdf4')

File c:\Users\Daniel\anaconda3\envs\mrms\lib\site-packages\xarray\backends\api.py:908, in open_mfdataset(paths, chunks, concat_dim, compat, preprocess, engine, data_vars, coords, combine, parallel, join, attrs_file, combine_attrs, **kwargs) ... File src\netCDF4_netCDF4.pyx:2307, in netCDF4._netCDF4.Dataset.init()

File src\netCDF4_netCDF4.pyx:1925, in netCDF4._netCDF4._ensure_nc_success()

PermissionError: [Errno 13] Permission denied: b'd:\mrms_processing\_reprex\2022-7-18_open_mfdataset\data' ```