[netcdfgroup] netCDF-C 4.6.2 now available

• To: "netcdfgroup@xxxxxxxxxxxxxxxx List" <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: [netcdfgroup] netCDF-C 4.6.2 now available
• From: Ward Fisher <wfisher@xxxxxxxx>
• Date: Mon, 19 Nov 2018 12:52:18 -0700

Hello all,

The Unidata netCDF team is happy to announce the release of netCDF-C 4.6.2.

Resources:

   - Download source:
   https://github.com/Unidata/netcdf-c/releases/tag/v4.6.2 or
   https://www.unidata.ucar.edu/downloads/netcdf/index.jsp
   - Documentation: https://www.unidata.ucar.edu/software/netcdf/docs
   - Windows binaries download:
   https://www.unidata.ucar.edu/software/netcdf/docs/winbin.html

There have been a number of changes since the previous release (many of
which are captured below). I hope to have netCDF-Fortran 4.5.0 out by the
end of the week or early next week (given that US Thanksgiving is this
week), and the C++ interface will follow shortly after that.

Once we turn our attention back to the C library, our next big push will be
native access to data stored in object storage (Amazon S3, etc). Have a
great week all, please contact us with any bug reports or questions, thank
you all for your patience!

Thank you very much all, have a great day,

-Ward

Ward Fisher
Unidata
Software Engineer - NetCDF Team Lead

The changes from version 4.6.1 include (but are not limited to):

   - [Enhancement] Lazy att read - only read atts when user requests one of
   them. See GitHub #857 <https://github.com/Unidata/netcdf-c/issues/857>.
   - [Enhancement] Fast global att read - when global atts are read, they
   are read much more quickly. See GitHub #857
   <https://github.com/Unidata/netcdf-c/issues/857>.
   - [Enhancement] Add nccopy command options for per-variable chunk
   sizing, and minimum chunk size. See GitHub #1087
   <https://github.com/Unidata/netcdf-c/pull/1087>.
   - [Bug Fix] Fix nccopy handling of user specified chunk sizes. See GitHub
   #725 <https://github.com/Unidata/netcdf-c/issues/725>,#1087
   <https://github.com/Unidata/netcdf-c/issues/1087>.
   - [Bug Fix] Avoid limit on number of times a netCDF4 attribute can be
   updated. Not a complete fix for the HDF5 “maximum creation order” problem,
   but should greatly reduce occurrences in many real-world cases. See GitHub
   #350 <https://github.com/Unidata/netcdf-c/issues/350>.
   - [Bug Fix] The use of NC_DISKLESS has been modified to make it cleaner.
   This adds a new flag called NC_PERSIST that takes over the now obsolete
   NC_MPIPOSIX.
   - [Obsolete] Obsolete the MPIPOSIX flag.
   - [Bug Fix] When using filters with HDF5 1.10.x or later, it is
   necessary to utilize the HDF5 replacements for malloc, realloc, and free in
   the filter code.
   - [Enhancement] Create a new version of _NCProperties provenance
   attribute. This version (version 2) supports arbitrary key-value pairs. It
   is the default when new files are created. Version 1 continues to be
   accepted.
   - [Enhancement] Allow user to set http read buffersize for DAP2 and DAP4
   using the tag HTTP.READ.BUFFERSIZE in the .daprc file.
   - [Enhancement] Allow user to set http keepalive for DAP2 and DAP4 using
   the tag HTTP.KEEPALIVE in the .daprc file (see the OPeNDAP documentation
   for details).
   - [Enhancement] Support DAP4 remote tests using a new remote test server
   locatedon the Unidata JetStream project.
   - [Enhancement] Improved the performance of the nc_get/put_vars
   operations by using the equivalent slab capabilities of hdf5. Result is a
   significant speedup of these operations. See GitHub #1001
   <https://github.com/Unidata/netcdf-c/pull/1001> for more information.
   - [Enhancement] Expanded the capabilities of NC_INMEMORY to support
   writing and accessing the final modified memory. See GitHub #879
   <https://github.com/Unidata/netcdf-c/pull/879> for more information.
   - [Enhancement] Made CDF5 support enabled by default. See Github #931
   <https://github.com/Unidata/netcdf-c/issues/931> for more information.
   - [Bug Fix] Corrected a number of memory issues identified in
ncgen. See GitHub
   #558 for more information <https://github.com/Unidata/netcdf-c/pull/558> .

• Follow-Ups:
  • Re: [netcdfgroup] netCDF-C 4.6.2 now available
    • From: Ed Hartnett