Thanks, I studied math not in English, that's why I didn't know :) I made a simple tests and it seems to work nicely. However, I'm not sure whether it will work with more complicated cases like copying, deleting, etc.
Vyacheslav On Nov 25, 2011, at 1:15 PM, Daniel Shahaf wrote: > "left as an exercise for the reader" --- in other words, I was > identifying a potential issue and letting the audience figure out the > solution for themselves. It's a standard idiom in math textbooks... > > (and, of course, if you have questions about that interoperability > issue, feel free to raise them on this list.) > > Vyacheslav Zholudev wrote on Fri, Nov 25, 2011 at 13:07:52 +0100: >> 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 >>>>>>>> >>>>>>>> >>>>>>>> >>>>>> >>>> >>
