-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ralf Hemmecke wrote: > Tres Seaver <tseaver <at> palladion.com> writes: > >> Sharing the blobs using a DVCS pull sounds like an interesting approach. >> One flaw with your outlined implementation is that ZODB blob files are >> *never* updated: rather, if a ZODB object updates the blob object, it >> creates a new blob file and stores its ID. Old blob files are cleaned >> up during a pack. > > Interesting. You know what git does? If one adds a file X (actually git deals > with contents not files) to the repository, git computes a hash value (sha1) > and > uses that value as the name for the file. It's stored under the .git > directory. > Some update of bookkeeping data and that's it. > If the contents of the file X changes, and it is committed to the git > repository, git computes a sha1 and stores the new content under that new sha1 > name + updating of the bookkeeping. The old file is not deleted. Git does not > even bother to compress anything. That would be done by an additional "git > gc". > In contrast to most other SCMs git can be considered as a database. That git > is > mostly recognized as a version control system, is only half of the story. The > underlying storage system is what make git so interesting. > > I have no good knowledge of zodb and you are certainly doing great with it, > but > my concern is with the blobs (which as I hopefully understand correctly are to > be stored outside of Plone's Data.fs). > Storing versions of files into a DVCS is like freeing the zodb (for blobs) > from > doing its own versioning. > > Actually, I think conceptually git and the zodb are quite similar. One > transaction is nothing else than a commit in the SCM sense. > >> If you want to experiment with the idea anyway, then writing a "wrapper" >> storage is probably the way to go: DemoStorage is one such beast, as is >> the BlobStorage itself. > > I'm sorry, I cannot do this. I've simply no time for opening up another area > of > development for me.
I understand that completely: I'm there myself. ;) Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkvodS4ACgkQ+gerLs4ltQ68JACgnReABZhAcIOcpxADMftidN6D WK4AniKQUv7LU1X1fSqFY8gFZ3xuhllA =J5Q0 -----END PGP SIGNATURE----- _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
