Re: obliterate in trunk (was: svn commit: r39745 - trunk/subversion/svn)

On Mon, Oct 12, 2009 at 4:28 PM, Branko Čibej <brane_at_xbc.nu> wrote:
> David Glasser wrote:
>> For what it's worth, the current schema for the rep-sharing DB is
>> completely incompatible with "remove data from server" obliterate
>>
>
> You mean in the sense that you can't reasonably in real-time remove
> entries from the datbase, right? I can imagine having separate, offline
> process that would scan the whole repository for a particular
> representation hash and do the actual on-disk data removal and rep-cache
> cleanup. But it would require a write lock on the repository.

OK, sure, if you're OK with "disable commits while we walk the entire
repository, every single node" then it would work (though note that a
few days ago we decided that the rep-sharing DB should be written
after the write lock is dropped, which could hypothetically be minorly
problematic here). Of course, that's going to be kind of slow. But I
guess we do even have some repo-walking logic in there already (in the
svnadmin verify code, IIRC).

--dave

-- 
glasser_at_davidglasser.net | langtonlabs.org | flickr.com/photos/glasser/
------------------------------------------------------
http://subversion.tigris.org/ds/viewMessage.do?dsForumId=462&dsMessageId=2406846