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. I suggested yesterday on users@ to create a new hierarchy (parallel to revs/ and revprops/) and to store information regarding the successors of /path/to/f...@rn023 somewhere under $new_hierarchy/N/N023/** --- where 'somewhere' is to be defined. (I have some unfinished thoughts about this.) 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'?