List lists all namespace.

Load loads a namespace, return nil if no namespace found.

New creates a Namespace.

Register registers a namespace.

RemoveDB returns a command to remove an existing DB.

RemoveGroup returns a command to remove an existing DB group.

RemoveNode returns a command to remove an existing node from namespace.

Unregister unregisters a namespace.

UpdateRule updates the rule.

UpdateWeight returns a command to update the weight of DB.

UpsertDB appends a new DB.