public void map(Object key, Text value, Context context)
				throws IOException, InterruptedException {
			String clusterInfo[] = parser.parseLine(value.toString());
			for (String toBeClassify : airportList) {
				int neighbors = 0;
				String hashKey = null;
				for (String classObj : clusterInfo) {
					hashKey = toBeClassify.compareTo(classObj) < 0 ? toBeClassify
							+ "," + classObj
							: classObj + "," + toBeClassify;
					if (matrix.containsKey(hashKey) && matrix.get(hashKey) <= K)
						neighbors++;
				}
				context.write(new Text(toBeClassify), new Text(value.toString()
						+ "-" + String.valueOf(neighbors)));
			}
		}