java读取160M的文件总是内存溢出，求大侠们帮忙看下代码是否有问题：报错

public static HashMap<String, String> ip2map = new HashMap<String, String>();
public static HashMap<String, ArrayList<String>> map2localtion = new HashMap<String, ArrayList<String>>();

	public UDFGetIPLocation() {
		//String uri ="hdfs://hd03:9000/user/hive/warehouse/ip_location/IP-COUNTRY-REGION-CITY.CSV.hive";
		String uri = "hdfs://localhost:9000/hadoop/test/IP-COUNTRY-REGION-CITY.CSV.hive";
		Configuration conf = new Configuration();
		FileSystem fs = null;
		FSDataInputStream in = null;
		BufferedReader d = null;

		try {
			fs = FileSystem.get(URI.create(uri), conf);
			in = fs.open(new Path(uri));
			d = new BufferedReader(new InputStreamReader(in));
			String s = null;
			int stat = 1;
			while (true) {
				System.out.println("line "+stat++);
				s = d.readLine();
				if (s == null) {
					break;
				} else {
					String[] parts = StringUtils.split(s, "\001");// 确认分割符
					if (!(parts[0].equals("-") || parts[1].equals("-") || parts[2].equals("-"))) {
						// set ip2map
						for (long start = Long.parseLong(parts[0]); start <= Long
								.parseLong(parts[0]) + 255; start++) {
							ip2map.put(Long.toString(start), parts[0]);
						}
						// set map2localtion
						map2localtion.put(parts[0], new ArrayList<String>());
						for (int i = 0; i < parts.length; i++) {
							map2localtion.get(parts[0]).add(parts[i]);
						}
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			IOUtils.closeStream(in);
		}
	}

刚刚出炉的一个类，其实是写的hive的UDF。读取一个160M左右的文件，但是总是在读到9500行左右的时候报内存溢出。求大侠指导，3Q