*/
public Mutator writeSubCounterColumns(String colFamily, Bytes rowKey, Bytes colName, List<CounterColumn> subColumns) {
safeGetRowKey(rowKey);
validateColumnName(colName);
validateCounterColumns(subColumns);
CounterSuperColumn scol = new CounterSuperColumn(nullSafeGet(colName), subColumns);
ColumnOrSuperColumn cosc = new ColumnOrSuperColumn();
cosc.setCounter_super_column(scol);
Mutation mutation = new Mutation();
mutation.setColumn_or_supercolumn(cosc);
getMutationList(colFamily, rowKey).add(mutation);