I once made a very simple CouchDB undelete tool. It scans your disk device for anything that looks like the on-disk CouchDB JSON format.
https://github.com/jhs/grep_couch I've recovered data with it, but notably, the _id and _rev are *not* stored with the rest of a document, so you tend to get lots of docs with no _id field. (I'm considering always having an "id" field to dupe the "_id" in case I ever have to do that again.) On Mon, Jun 6, 2011 at 3:35 PM, René Brüntrup <[email protected]> wrote: > Hello! > >> 1) Are you certain that you were in fact writing to the database on this >> server and not the replica? Can you share some access logs towards that end? > > We could not find the missing data in any of the replicated files. Each > backup has an increasing number of documents with the least amount of > missing data in the newest backup. Access logs from the 2011-03-08 are > unfortunately missing, because the log rotation already removed them. > >> 2) Is it possible that you've inadvertently restored the database file from >> a backup? > > No backup was created at this date and we do not have any mechanisms > that could automatically restore the backups. > >> 3) Is it possible that you were writing "underneath" the encrypted LVM >> volume for the past two months? > > Our system does not work without an initialized database that contains a > number of user account and definition documents. But even if such an > initialized database would have been available underneath the encrypted > volume we would have noticed a data loss after changing the database, > because the system was already in use before the 2011-03-08. > > > We will check again, if there is a database file underneath the > encrypted volume, but we cannot stop the system right now. When > replicating the database we just noticed, that the timestamp of the > source database was updated. The replication processes that where > started after the 2011-03-08 and before the reboot of the server did not > change the timestamp of the source database. > > > Regards, > René > > > -- Iris Couch
