public class NotesMigration
extends Object

Holds the current state of the NoteDb migration.

The migration will proceed one root entity type at a time. A root entity is an entity stored in ReviewDb whose key's getParentKey() method returns null. For an example of the entity hierarchy rooted at Change, see the diagram in com.google.gerrit.reviewdb.client.Change.

During a transitional period, each root entity group from ReviewDb may be either written to or both written to and read from NoteDb.

This class controls the state of the migration according to options in gerrit.config. In general, any changes to these options should only be made by adventurous administrators, who know what they're doing, on non-production data, for the purposes of testing the NoteDb implementation. Changing options quite likely requires re-running RebuildNoteDb. For these reasons, the options remain undocumented.