Thanks, Daniel. That's the pointer I needed. However, I didn't understand what LAAEFTR means.
Vyacheslav On Nov 25, 2011, at 12:17 PM, Daniel Shahaf wrote: > Change SVN_FS_BASE__MIN_FORWARD_DELTAS_FORMAT to be larger than > SVN_FS_BASE__FORMAT_NUMBER. > > Whether repositories created by an svn patched in this way will be > interoperable with repositories created by an unpatched svn is > LAAEFTR'd. I'd be cautious and change db/fs-type or db/format. > > Vyacheslav Zholudev wrote on Fri, Nov 25, 2011 at 12:04:22 +0100: >> Hi Daniel, >> >> would it be easy to change the code (I want to do it for my experiments) so >> that the HEAD (youngest) revisions are stored as fulltexts? Or is it >> something that was not foreseen by design to easily switch between >> approaches of representing history information? >> >> Thanks, >> Vyacheslav >> >> On Nov 25, 2011, at 11:59 AM, Daniel Shahaf wrote: >> >>> Vyacheslav Zholudev wrote on Fri, Nov 25, 2011 at 11:13:00 +0100: >>>> >>>>> Old BDB-backed repositories stored the older revision as fulltext and >>>>> newer revisions as deltas. >>>> >>>> Really? >>> >>> It seems that I should have swapped "older" and "newer" in the quoted >>> sentence. Thanks for catching that. >>> >>>> Here is a quotation from SVN 1.4.6 libsvn_fs_base/note/structure: >>>> "At present, Subversion generally stores >>>> the youngest strings in "fulltext" form, and older strings as "delta"s >>>> against them (unless the delta would save no space compared to the >>>> fulltext). >>>> " >>>> My own experiments with SVN 1.4 code confirm that. >>>> >>>> >>>> >>>>> Repositories created with or 'svnadmin >>>>> upgrade'd by 1.6 and newer reverse this for new revisions of files >>>>> (while making sure not to introduce a dependency loop in the direction >>>>> of deltas). >>>>> >>>>> http://subversion.apache.org/docs/release-notes/1.6#bdb-forward-deltas >>>>> >>>>> On Friday, November 25, 2011 1:08 AM, "Vyacheslav Zholudev" >>>>> <vyacheslav.zholu...@gmail.com> wrote: >>>>>> Hi, >>>>>> >>>>>> how does SVN 1.7.1 store fulltext and deltas in the BDB backend? From >>>>>> some time ago I remember that previous versions of SVN stored "almost" >>>>>> always a HEAD revision as fulltext, and others as reverse deltas.(except >>>>>> the case when a delta is bigger that fulltext) Was this behavior changed >>>>>> in SVN 1.7? I've looked at the notes about BDB and they don't differ >>>>>> almost at all from SVN 1.4's ones. Of course, I could look into the code >>>>>> more carefully, but my hope was that it wouldn't be a big deal to give >>>>>> me a short answer, if possible. >>>>>> >>>>>> Thanks in advance! >>>>>> >>>>>> Best, >>>>>> Vyacheslav >>>>>> >>>>>> >>>>>> >>>> >>
