public Increment addColumn(byte[] family, byte[] qualifier, long amount) {
    Preconditions.checkArgument(family != null, "family cannot be null");
    List<ExtendedCell> list = getCellList(family);
    KeyValue kv = createPutKeyValue(family, qualifier, ts, Bytes.toBytes(amount));
    list.add(kv);
    return this;
  }
Increment the column from the specific family with the specified qualifier by the specified
amount.
<p>
Overrides previous calls to addColumn for this family and qualifier.
@param family    family name
@param qualifier column qualifier
@param amount    amount to increment by
@return the Increment object
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Increment.java