issues: 621177286

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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
621177286 MDU6SXNzdWU2MjExNzcyODY= 4082 "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 65610153 closed 0     26 2020-05-19T18:00:58Z 2022-04-09T15:51:46Z 2022-04-09T15:51:46Z NONE      

Error in loading in data from a THREDDS server. Can't find any info on what might be causing it based on the error messages themselves.

Code Sample

``` def list_dates(start, end): num_days = (end - start).days return [start + dt.timedelta(days=x) for x in range(num_days)]

start_date = dt.date(2017, 3, 1) end_date = dt.date(2017, 3, 31) date_list = list_dates(start_date, end_date) window = dt.timedelta(days=5)

url = 'https://www.ncei.noaa.gov/thredds/dodsC/OisstBase/NetCDF/V2.0/AVHRR/{0:%Y%m}/avhrr-only-v2.{0:%Y%m%d}.nc' data = [] cur_date = start_date for cur_date in date_list:

date_window = list_dates(cur_date - window, cur_date + window)
url_list = [url.format(x) for x in date_window]
window_data=xr.open_mfdataset(url_list).sst
data.append(window_data.mean('time'))

dataf=xr.concat(data, dim=pd.DatetimeIndex(date_list, name='time'))

``` Expected Output No error with dataf containing a data array with the dates listed above.

Error Description Error 1:

KeyError: [<class 'netCDF4._netCDF4.Dataset'>, ('https://www.ncei.noaa.gov/thredds/dodsC/OisstBase/NetCDF/V2.0/AVHRR/201703/avhrr-only-v2.20170322.nc',), 'r', (('clobber', True), ('diskless', False), ('format', 'NETCDF4'), ('persist', False))]

Error 2: OSError: [Errno -37] NetCDF: Write to read only: b'https://www.ncei.noaa.gov/thredds/dodsC/OisstBase/NetCDF/V2.0/AVHRR/201703/avhrr-only-v2.20170322.nc'

Versions python: 3.7.4 xarray: 0.15.0 pandas: 0.25.1 numpy: 1.16.5 scipy: 1.3.1 netcdf4: 1.5.3

 
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   completed 13221727 issue

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