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  • dcherian · 3 ✖

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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
489164504 https://github.com/pydata/xarray/issues/1849#issuecomment-489164504 https://api.github.com/repos/pydata/xarray/issues/1849 MDEyOklzc3VlQ29tbWVudDQ4OTE2NDUwNA== dcherian 2448579 2019-05-03T16:51:40Z 2019-05-03T16:51:40Z MEMBER

Because it's set in your input file. Both example files in this thread have _Storage = 'contiguous' set on all variables but the dimensions are not unlimited, so these files are compliant. Here's the output of ncdump -sh sample.nc (second comment in this thread)

``` netcdf sample { dimensions: y = 6 ; variables: float x(y) ; x:_FillValue = NaNf ; x:_Storage = "contiguous" ; x:_Endianness = "little" ; int64 y(y) ; y:_Storage = "contiguous" ; y:_Endianness = "little" ;

// global attributes: :_NCProperties = "version=1,netcdflibversion=4.4.1.1,hdf5libversion=1.8.18" ; :_SuperblockVersion = 0 ; :_IsNetcdf4 = 1 ; :_Format = "netCDF-4" ; ```

When you ask xarray to write out an unlimited dimension, it doesn't delete encoding['contiguous'] and then netCDF4 raises an error (I think).

It's probable that the underlying software you're using to write has probably changed versions and is setting it by default. You can check this by comparing the output of ncdump -sh file.nc on cheyenne and your local machine

If this is right, the solution would be either a) delete encoding['contiguous'] if it is True when asked to write out an unlimited dimension. b) raise a warning and ask the user to do the deletion before writing.

My preference is for (a).

 
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   passing unlimited_dims to to_netcdf triggers RuntimeError: NetCDF: Invalid argument 290572700
488870732 https://github.com/pydata/xarray/issues/1849#issuecomment-488870732 https://api.github.com/repos/pydata/xarray/issues/1849 MDEyOklzc3VlQ29tbWVudDQ4ODg3MDczMg== dcherian 2448579 2019-05-02T23:44:00Z 2019-05-02T23:44:00Z MEMBER

does ncdump -sh show whether contiguous is true?

 
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   passing unlimited_dims to to_netcdf triggers RuntimeError: NetCDF: Invalid argument 290572700
488843571 https://github.com/pydata/xarray/issues/1849#issuecomment-488843571 https://api.github.com/repos/pydata/xarray/issues/1849 MDEyOklzc3VlQ29tbWVudDQ4ODg0MzU3MQ== dcherian 2448579 2019-05-02T21:44:29Z 2019-05-02T21:44:29Z MEMBER

@jmccreight Are you up for sending in a PR to raise an informative error message?

 
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   passing unlimited_dims to to_netcdf triggers RuntimeError: NetCDF: Invalid argument 290572700

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