@Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (obj == null) {
        return false;
      }
      if (getClass() != obj.getClass()) {
        return false;
      }

      FullyQualifiedRow other = (FullyQualifiedRow) obj;

      if (!Arrays.equals(family, other.family)) {
        return false;
      }
      if (!Arrays.equals(qualifier, other.qualifier)) {
        return false;
      }
      if (!Arrays.equals(rowKey, other.rowKey)) {
        return false;
      }

      return Arrays.equals(table, other.table);
    }
Used to identify a cell that will be incremented.
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/IncrementCoalescer.java