public static void addMutation(
     Mutation rm,
     String columnFamilyName,
     String superColumnName,
     long columnName,
     String value,
     long timestamp) {
   CellName cname =
       superColumnName == null
           ? CellNames.simpleDense(getBytes(columnName))
           : CellNames.compositeDense(ByteBufferUtil.bytes(superColumnName), getBytes(columnName));
   rm.add(columnFamilyName, cname, ByteBufferUtil.bytes(value), timestamp);
 }
 public static CellName cellname(ByteBuffer... bbs) {
   if (bbs.length == 1) return CellNames.simpleDense(bbs[0]);
   else return CellNames.compositeDense(bbs);
 }