Re: FSFS and fs-successor-ids

On 11/29/2010 05:58 AM, Daniel Shahaf wrote:
> The fs-successor-ids branch adds successor ids (effectively, copyto
> information) to the BDB backend. It hasn't touched libsvn_fs_fs or
> libsvn_fs yet.
>
> Has design of this feature for FSFS been discussed at all? I couldn't
> find anything in the archives.

No. I had always assumed that we'd just dump the information into SQLite.

> Also, I haven't seen the successor-ids during upgrade considered. Do we
> consider the successor ids ('successors' table, or $new_hierarchy/) just
> a cache of derived information (like node-origins), or does it have to
> be retroactively-populated at the time of and by 'svnadmin upgrade'?

It really needs to be populated in full, because real-time calculation is
unfeasible from a performance standpoint. This means that once in place,
this code will either be an 'svnadmin upgrade' blocker ("svn:error:Cannot
upgrade to version N -- you must perform a full dump and load of your
repository.") or a feature blocker ("svn:error:Repository lacks successor
information required to answer your query -- consider dumping and re-loading.").

-- 
C. Michael Pilato <cmpilato_at_collab.net>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand