...
SafeVersion (Master vector clock) - the version number for the next object creation on this server
Restoration: Reading special object 'objectSafeVersion' appended at the beginning of log segment to restore safeVersion when the segment was created. Then at the log replay, safeVersion is updated to maintain safeVersion is bigger than the version numbers of any replayed tomb stones in the restored open segment. Since log cleaner deletes tomb stones in closed segments, 'objectSafeVersion' retains the safeVersion when the head segment is opened.
Id -> Ptr Hashtable - the location in RAM for each object id
Restoration: After re-reading segment metadata from backup scan all objects, populating the hashtable.
...