public void createCommentAttrs(HashMap<String,ByteIterator> commentValues){
		//insert random timestamp, type and content for the comment created
		String[] fieldName = {"timestamp", "type", "content"};
		for (int i = 1; i <= 3; ++i)
		{
			String fieldKey = fieldName[i-1];
			ByteIterator data;
			if(1 == i){
				Date date = new Date();
				SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
				String dateString = sdf.format(date);
				data = new ObjectByteIterator(dateString.getBytes()); // Timestamp.
			}else{
				data = new RandomByteIterator(100); // Other fields.
			}
			commentValues.put(fieldKey, data);
		}
		
	}