Oops, a typo in the fourth paragraph. It should say "netcdf-C library
versions from 4.0 to 4.4.0", NOT 4.4.1. Sorry.
--Dave
On Thu, Jun 23, 2016 at 4:41 PM, Dave Allured - NOAA Affiliate <
dave.allured@xxxxxxxx> wrote:
> Ward,
>
> Please add something in the release notes about the latest change to the
> superblock version number. This note should probably go with the first
> release item under 4.4.1-RC1. I suggest something like this:
>
> "Starting with release 4.4.1, new netcdf-4 files will be created with
> superblock version 0 in the underlying HDF5 file format. Netcdf-C versions
> 4.0 through 4.4.0, linked to HDF5 library versions 1.8.x and earlier, were
> created with superblock version 2.
>
> "Superblock versions 0 and 2 appear to be forward and backward compatible
> with old and new library versions. Exact binary compatibility will be
> broken, but data and access should remain the same.
>
> "The combination of netcdf-C library versions from 4.0 to 4.4.1, and HDF5
> library versions 1.10.0 and later, should be avoided. These combinations
> create superblock version 3 files which are not readable with older
> compiled software."
>
> My testing with superblock version 0 files is very limited so far, so I am
> not confident in the above statement "forward and backward compatible". I
> hope that Unidata's testing, and perhaps other netcdf users, can provide
> additional evidence for this claim.
>
> --Dave A.
>
>
> On Mon, Jun 20, 2016 at 2:58 PM, Ward Fisher <wfisher@xxxxxxxx> wrote:
>
>> Hello all,
>>
>> The third (and hopefully final) release candidate for netCDF-C 4.4.1 has
>> been released. As a reminder, the 4.4.1 release will primarily address the
>> issue of backwards-compatible netCDF4 binary files generated on systems
>> using libhdf5 1.10+.
>>
>> Thanks to everybody who provided feedback following the previous release
>> candidate; the bugs that were reported have been fixed. Full release notes
>> may
>> be found here
>> <https://github.com/Unidata/netcdf-c/blob/v4.4.1-rc3/RELEASE_NOTES.md>,
>> but the notable items are listed below.
>>
>> The source tarballs for this release candidate may be downloaded from the
>> Unidata GitHub page, at http://github.com/Unidata/netcdf-c/releases.
>> Documentation may be found at
>> http://www.unidata.ucar.edu/software/netcdf/docs_rc, and the
>> pre-compiled Windows binaries may be downloaded from
>> http://www.unidata.ucar.edu/software/netcdf/docs_rc/winbin.html.
>> Assuming no other issues are reported, we will try to have the full 4.4.1
>> release available in short order.
>>
>> Thanks in advance for any and all feedback; have a great day all!
>>
>> -Ward
>>
>> Ward Fisher
>> wfisher@xxxxxxxx
>> UCAR/Unidata - Software Engineer
>> 4.4.1-RC3 - June 20, 2016
>>
>> - [Bug Fix] Corrected an issue where adding a _FillValue attribute to
>> a variable would result in other attributes being lost. See GitHub
>> #239 <https://github.com/Unidata/netcdf-c/issues/239> for more
>> details.
>> - [Bug Fix][Parallel I/O] Corrected an issue reported by Kent Yang at
>> the HDF group related to Collective Parallel I/O and a potential hang.
>>
>>
