I'm about to check in first cut at a migration script that will carry hbase data from 0.19 to 0.20. Part of the checkin involves changing the filesystem version number from 6 to 7. This means that if you svn update, you are subsequently going to be flagged that the filesystem needs migrating.
To quell this message, see hbase-1215 for a script that will up your filesystem version number for you. Use it if your data was written with a recent hbase TRUNK. hbase-1215 has instructions on how to run the script. St.Ack
