public static ArrayList<Integer> myShuffle(long docSize) {
		ArrayList<Integer> myList = new ArrayList<Integer>();
		int i;
		long docBlockNum = docSize / 1024;
		if (docSize % 1024 != 0)
			docBlockNum += 1;
		for (i = 0; i < docBlockNum-1; i++)
			myList.add(i);
		Collections.shuffle(myList);
		myList.add((int)docBlockNum-1);
		return myList;
	}