content: // cc SequenceFileReadDemo Reading a SequenceFile
  import java.io.IOException;
  import java.net.URI;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.IOUtils;
  import org.apache.hadoop.io.SequenceFile;
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.util.ReflectionUtils;
  
  // vv SequenceFileReadDemo
  public class SequenceFileReadDemo {
    
    public static void main(String[] args) throws IOException {
      String uri = args[0];
      Configuration conf = new Configuration();
      FileSystem fs = FileSystem.get(URI.create(uri), conf);
      Path path = new Path(uri);
  
      SequenceFile.Reader reader = null;
      try {
        reader = new SequenceFile.Reader(fs, path, conf);
        Writable key = (Writable)
          ReflectionUtils.newInstance(reader.getKeyClass(), conf);
        Writable value = (Writable)
          ReflectionUtils.newInstance(reader.getValueClass(), conf);
        long position = reader.getPosition();
        while (reader.next(key, value)) {
          String syncSeen = reader.syncSeen() ? "*" : "";
          System.out.printf("[%s%s]\t%s\t%s\n", position, syncSeen, key, value);
          position = reader.getPosition(); // beginning of next record
        }
      } finally {
        IOUtils.closeStream(reader);
      }
    }
  }
  // ^^ SequenceFileReadDemo