Comment 2 for bug 429781

It has to do with migrating snapshots created with version 1.5 to 1.6. If you create a snapshot in 1.5 and upgrade to 1.6 (not clean install), your old snapshots may not be available (in multi component/multi cluster mode). There is a fix for the migration in the head, but part of the process requires running a database import script offline. I have left this open because we need to document the import path.