public void write(final DataOutput out)
  throws IOException {
    out.writeByte(PUT_VERSION);
    Bytes.writeByteArray(out, this.row);
    out.writeLong(this.timestamp);
    out.writeLong(this.lockId);
    out.writeBoolean(this.writeToWAL);
    out.writeInt(familyMap.size());
    for (Map.Entry<byte [], List<KeyValue>> entry : familyMap.entrySet()) {
      Bytes.writeByteArray(out, entry.getKey());
      List<KeyValue> keys = entry.getValue();
      out.writeInt(keys.size());
      int totalLen = 0;
      for(KeyValue kv : keys) {
        totalLen += kv.getLength();
      }
      out.writeInt(totalLen);
      for(KeyValue kv : keys) {
        out.writeInt(kv.getLength());
        out.write(kv.getBuffer(), kv.getOffset(), kv.getLength());
      }
    }
  }