If this is of any interest... (see the suggestion below) Move of discussion from plone-users http://plone.293351.n2.nabble.com/question-about-using-repozo-and-blob-storage-tp5016465p5016465.html
Ralf -------- Original Message -------- Subject: Re: [Plone-Users] question about using repozo and blob storage Date: Fri, 7 May 2010 10:05:59 -0700 (PDT) From: ajung <li...@zopyx.com> To: plone-us...@lists.sourceforge.net This list is the wrong place for such deep ZODB related discussions. Suggest this on the zodb-dev list. -aj Ralf Hemmecke-2 wrote: > > On 05/07/2010 06:40 PM, ajung wrote: >> >> Blobs are - as David explained - a _core_ component of the ZODB. Content >> stored through the file storage or blob storage are handled and treated >> in >> the same way to the application. If you want to write a SCM-based backend >> for ZODB....I am not sure how far you will get and if it would be >> reasonably >> fast and without major architectural issues. > > I understand that meta data lives still in ZODB. And I wouldn't want to > suggest that people deal with the blobs in any other way than through > plone. One should only be able to have read access to the blobstorage > (if it's not through plone, otherwise disaster may happen). > > I haven't actually looked into how blobs are actually stored on the file > system, i.e., in particular what name they will have and whether the > file system structure is the same as the folder hierarchy inside plone. > But that doesn't actually matter. > > I assume that they are stored in some directory in a directory for > blobs, let's call it blobdir. > > I speak now for git, but other SCMs are quite similar (maybe not svn). > > This blobdir is turned into a repository by simply saying "git init". > > Then when plone stores a file, it will write it into (a subdir of) > blobdir. With GIT behind that should read: > > (1) write it into blobdir and then > (2) git add FILENAME" > (3) git commit -m "some message" > > That's it. > > If the user uploads a new file to plone, then plone doesn't have to care > about renaming the old file and storing the new, it simply has to do THE > SAME steps (1)..(3) as above. I call that easier. > > Maybe packing is a bit more difficult and depends on the SCM in > question. For git it would be a simple "git filter-branch" (of course > with appropriate parameters) followed by "git gc". > > Just my two cents. I would find such a GIT backend wonderful. But I've > no experience with how that blob stuff is actually done through > plone/zope. So sorry if I cannot provide any code. > > Ralf > > ------------------------------------------------------------------------------ _______________________________________________ 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
