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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
236460253 MDU6SXNzdWUyMzY0NjAyNTM= 1458 writing datasets derived from netCDF4 with compression fails matt-long 9341267 closed 0     4 2017-06-16T11:48:19Z 2019-08-01T00:27:43Z 2019-08-01T00:27:43Z NONE      

When I read a file with netCDF4 compression into a Dataset, a subsequent call to write the dataset using to_netcdf fails.

For instance, using data from the POP model, I can convert output to netCDF4 using NCO $ ncks --netcdf4 --deflate 1 $file nc4-test.nc

Then in Python: ds = xr.open_dataset('nc4-test.nc',decode_times=False,decode_coords=False) ds.to_netcdf('test-out.nc')

The write fails with: File "netCDF4/_netCDF4.pyx", line 2263, in netCDF4._netCDF4.Dataset.createVariable (netCDF4/_netCDF4.c:18764) File "netCDF4/_netCDF4.pyx", line 3235, in netCDF4._netCDF4.Variable.__init__ (netCDF4/_netCDF4.c:31564) RuntimeError: NetCDF: Bad chunk sizes. If I include format = NETCDF3_64BIT, the write completes.

This seems like a bug.

Example dataset: ftp://ftp.ucar.edu/pub/cgd/mclong/misc/nc4-test.nc

 
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   completed xarray 13221727 issue

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