public static boolean hasValidMobRefCellValue(Cell cell) {
    return cell.getValueLength() > Bytes.SIZEOF_INT;
  }
Indicates whether the current mob ref cell has a valid value. A mob ref cell has a mob
reference tag. The value of a mob ref cell consists of two parts, real mob value length and mob
file name. The real mob value length takes 4 bytes. The remaining part is the mob file name.
@param cell The mob ref cell.
@return True if the cell has a valid value.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java