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Releasing Blosc

Author: Francesc Alted
Date: 2014-01-15


  • Make sure that RELEASE_NOTES.rst and ANNOUNCE.rst are up to date with the latest news in the release.

  • Check that VERSION symbols in blosc/blosc.h contains the correct info.

  • Commit the changes:

    $ git commit -a -m"Getting ready for X.Y.Z release"


Create a new build/ directory, change into it and issue:

$ cmake ..
$ cmake --build .
$ ctest

To actually test Blosc the hard way, look at the end of:

where instructions on how to intensively test (and benchmark) Blosc are given.

Forward compatibility testing

First, go to the compat/ directory and generate a file with the current version:

$ cd ../compat
$ export LD_LIBRARY_PATH=../build/blosc
$ gcc -o filegen filegen.c -L$LD_LIBRARY_PATH -lblosc -I../blosc
$ ./filegen compress lz4 blosc-1.y.z-lz4.cdata

In order to make sure that we are not breaking forward compatibility, link and run the compat/filegen utility against different versions of the Blosc library (suggestion: 1.3.0, 1.7.0, 1.11.1, 1.14.1).

You can compile the utility with different blosc shared libraries with:

$ export LD_LIBRARY_PATH=shared_blosc_library_path
$ gcc -o filegen filegen.c -L$LD_LIBRARY_PATH -lblosc -Iblosc.h_include_path

Then, test the file created with the new version with:

$ ./filegen decompress blosc-1.y.z-lz4.cdata

If that works and you want to keep track of this for future compatibility checks just add the new file to the suite:

$ git add blosc-1.y.z-lz4.cdata
$ git commit -m"Add a new cdata file for compatibility checks"

Repeat this for every codec shipped with Blosc (blosclz, lz4, lz4hc, snappy, zlib and zstd).


  • Create a tag X.Y.Z from master:

    $ git switch master
    $ git tag -a vX.Y.Z -m "Tagging version X.Y.Z"
  • Push the previous commits and tag to the github repo:

    $ git push
    $ git push --tags


  • Send an announcement to the blosc, pytables-dev, bcolz and comp.compression lists. Use the ANNOUNCE.rst file as skeleton (possibly as the definitive version).

Post-release actions

  • Edit VERSION symbols in blosc/blosc.h in master to increment the version to the next minor one (i.e. X.Y.Z --> X.Y.(Z+1).dev).

  • Create new headers for adding new features in RELEASE_NOTES.rst and add this place-holder instead:

    #XXX version-specific blurb XXX#

  • Commit the changes:

    $ git commit -a -m"Post X.Y.Z release actions done"
    $ git push

That's all folks!

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