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  • "write to read-only" Error in xarray.open_mfdataset() with opendap datasets · 7 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1094072825 https://github.com/pydata/xarray/issues/4082#issuecomment-1094072825 https://api.github.com/repos/pydata/xarray/issues/4082 IC_kwDOAMm_X85BNjn5 max-sixty 5635139 2022-04-09T15:51:46Z 2022-04-09T15:51:46Z MEMBER

I'm trying to close issues that won't lead to changes — please reopen with a MCVE if this is still an issue.

 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286
642905079 https://github.com/pydata/xarray/issues/4082#issuecomment-642905079 https://api.github.com/repos/pydata/xarray/issues/4082 MDEyOklzc3VlQ29tbWVudDY0MjkwNTA3OQ== keewis 14808389 2020-06-11T20:15:54Z 2020-06-11T21:26:26Z MEMBER

the file_cache_maxsize option controls how many "files" are kept open simultaneously (see the uses of self._cache in https://github.com/pydata/xarray/blob/4071125feedee690364272e8fde9b94866f85bc7/xarray/backends/file_manager.py#L50 so this might be a issue in xarray that only happens for netcdf (?) on windows.

 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286
639221402 https://github.com/pydata/xarray/issues/4082#issuecomment-639221402 https://api.github.com/repos/pydata/xarray/issues/4082 MDEyOklzc3VlQ29tbWVudDYzOTIyMTQwMg== shoyer 1217238 2020-06-05T02:30:46Z 2020-06-05T02:30:46Z MEMBER

I wonder if this is somehow related to the fact that the file associated with a URL remains open in different calls to open_mfdataset when file_cache_maxsize > 10. One way to test this would be to change the script to only open each day's data once, e.g., opening the entire month at once.

Another possibility is that Windows has a smaller limit on the number of open connections for some reason.

 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286
632267849 https://github.com/pydata/xarray/issues/4082#issuecomment-632267849 https://api.github.com/repos/pydata/xarray/issues/4082 MDEyOklzc3VlQ29tbWVudDYzMjI2Nzg0OQ== keewis 14808389 2020-05-21T18:26:01Z 2020-05-21T18:26:01Z MEMBER

it looks like something went wrong when you installed netcdf4. Did you mix pip install with conda install? The rule for conda is normally that you either shouldn't use pip or, if you do, you shouldn't use conda again (conda doesn't know what pip does, so the environment might break).

 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286
632261972 https://github.com/pydata/xarray/issues/4082#issuecomment-632261972 https://api.github.com/repos/pydata/xarray/issues/4082 MDEyOklzc3VlQ29tbWVudDYzMjI2MTk3Mg== keewis 14808389 2020-05-21T18:13:35Z 2020-05-21T18:13:35Z MEMBER

umm... I think these are the related packages: - libhdf5 - libnetcdf - netcdf4

for reference, here's my environment ``` commit: 732b6cd6248ce715da74f3cd7a0e211eaa1d0aa2 python: 3.8.2 | packaged by conda-forge | (default, Apr 24 2020, 08:20:52) [GCC 7.3.0] python-bits: 64 OS: Linux byteorder: little LC_ALL: None libhdf5: 1.10.5 libnetcdf: 4.7.4 xarray: 0.15.1 pandas: 1.0.3 numpy: 1.18.1 scipy: 1.4.1 netCDF4: 1.5.3 pydap: installed h5netcdf: 0.8.0 h5py: 2.10.0 Nio: 1.5.5 zarr: 2.4.0 cftime: 1.1.1.2 nc_time_axis: 1.2.0 PseudoNetCDF: installed rasterio: 1.1.3 cfgrib: 0.9.8.1 iris: 2.4.0 bottleneck: 1.3.2 dask: 2.15.0 distributed: 2.15.2 matplotlib: 3.2.1 cartopy: 0.17.0 seaborn: 0.10.1 numbagg: installed setuptools: 46.1.3.post20200325 pip: 20.1 conda: None pytest: 5.4.1 IPython: 7.14.0 sphinx: None ``` 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286
632257306 https://github.com/pydata/xarray/issues/4082#issuecomment-632257306 https://api.github.com/repos/pydata/xarray/issues/4082 MDEyOklzc3VlQ29tbWVudDYzMjI1NzMwNg== keewis 14808389 2020-05-21T18:03:24Z 2020-05-21T18:03:24Z MEMBER

I can't reproduce this: except from a few future warnings about auto_combine your code sample works for me. Could you try updating your environment?

 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286
631122293 https://github.com/pydata/xarray/issues/4082#issuecomment-631122293 https://api.github.com/repos/pydata/xarray/issues/4082 MDEyOklzc3VlQ29tbWVudDYzMTEyMjI5Mw== shoyer 1217238 2020-05-19T22:35:22Z 2020-05-19T22:35:22Z MEMBER

Can you share the full error traceback you see?

 
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   "write to read-only" Error in xarray.open_mfdataset() with opendap datasets 621177286

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