@Override
  protected MigrateNamespaceTableProcedureState getInitialState() {
    return MigrateNamespaceTableProcedureState.MIGRATE_NAMESPACE_TABLE_ADD_FAMILY;
  }
Migrate the namespace data to meta table's namespace family while upgrading
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/MigrateNamespaceTableProcedure.java