@Override
  public TableName getTableName() {
    return tableName;
  }
The procedure will only update the table descriptor without reopening all the regions.
<p/>
It is usually used for migrating when upgrading, where we need to add something into the table
descriptor, such as the rs group information.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ModifyTableDescriptorProcedure.java