I committed the persistence patch at revision 84e762b3bd. You enable it by setting delta_store_type = file in server.config. I have flagged this option "experimental" for now by adding the following note in server.config.example:
"Note: file system support is experimental. Your server may crash. And the file format is not stable and shouldn't be relied upon for long-term storage yet; upcoming changes will require you to blow away your data." If you try it out, please report if things work (so we can remove "Your server may crash" from the note) or if they don't (so we can fix them). Possible file format changes include changes to id serialisation, by Alex North, and changes to the per-wavelet index file, which Frederic Gobry was looking at. I'll check with Alex and Frederic what their plans are and try to come up with a road map for stabilising the file format. Soren
