public ModifyableTableDescriptor modifyColumnFamily(final ColumnFamilyDescriptor family) {
      if (family.getName() == null || family.getName().length <= 0) {
        throw new IllegalArgumentException("Family name cannot be null or empty");
      }
      if (!hasColumnFamily(family.getName())) {
        throw new IllegalArgumentException(
          "Column family '" + family.getNameAsString() + "' does not exist");
      }
      return putColumnFamily(family);
    }
Modifies the existing column family.
@param family to update
@return this (for chained invocation)
hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java