SequenceFile与MapFile

public static String uri ="hdfs://192.168.1.201:9100";
    public static String []data ={
        "one, two",
        "three,four",
        "five,six",
        "seven,eight",
        "nine,ten"
    };
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(URI.create(uri),conf);
        Path path = new Path("/tmp1.seq");
        IntWritable key = new IntWritable();
        Text value = new Text();
        //SequenceFile.Writer writer = SequenceFile.createWriter(fs, conf,path,key.getClass(),value.getClass());
        SequenceFile.Writer writer = SequenceFile.createWriter(fs, conf, path, key.getClass(), value.getClass(),CompressionType.RECORD,new BZip2Codec());
        for(int i=0;i<100;i++){
            key.set(100-i);
            value.set(data[i%data.length]);
            writer.append(key,value);
        }
        IOUtils.closeStream(writer);
    }

   
    public static String uri = "hdfs://192.168.1.201:9100";
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(URI.create(uri),conf);
        Path path = new Path("/tmp1.seq");
        SequenceFile.Reader reader = new SequenceFile.Reader(fs, path, conf);
        Writable key = (Writable)ReflectionUtils.newInstance(reader.getKeyClass(), conf);
        Writable value = (Writable)ReflectionUtils.newInstance(reader.getValueClass(), conf);
        while(reader.next(key,value)){
            System.out.println("key =" +key);
            System.out.println("value =" +value);
            System.out.println("position =" + reader.getPosition());
        }
        IOUtils.closeStream(reader);
    }