protected void readInternal(ObjectDataInput in) throws IOException {
   super.readInternal(in);
   caller = in.readUTF();
   ttl = in.readLong();
 }
 @Override
 protected void writeInternal(ObjectDataOutput out) throws IOException {
   super.writeInternal(out);
   out.writeLong(recordId);
   out.writeData(value);
 }
 protected void writeInternal(ObjectDataOutput out) throws IOException {
   super.writeInternal(out);
   out.writeUTF(caller);
   out.writeLong(ttl);
 }
 @Override
 protected void readInternal(ObjectDataInput in) throws IOException {
   super.readInternal(in);
   recordId = in.readLong();
   value = in.readData();
 }