Hi all,
Recently, a feature was added to AsterixDB to allow a dataset to be rebalanced from a set of nodes (a node group) to another node group. Rebalancing a dataset will result in redistributing the dataset’s data to the nodes in the new node group. Since a single node may appear in both the old and the new node group, a new level in the storage tree had to be introduced to distinguish between the old and the new copies of the dataset. To do that without breaking backward compatibility for existing users who would like to upgrade binaries without having to reload their existing data, we added a migration utility that will run on the node startup and migrate the data to the new storage structure. However, it is recommended that you backup your existing data to avoid any permanent data loss in case of any unexpected failures during the migration process. Cheers, Murtadha
