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,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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