code: public static void setInputPaths(List<Path> paths, Configuration conf) throws IOException {
      Preconditions.checkNotNull(paths);
      Preconditions.checkArgument(!paths.isEmpty());
      String[] pathStrs = new String[paths.size()];
      int i = 0;
      for (Path p : paths) {
        FileSystem fs = p.getFileSystem(conf);
        pathStrs[i++] = fs.makeQualified(p).toString();
      }
      conf.setStrings(INPUT_PATHS_KEY, pathStrs);
    }
docs: Sets the input paths for for this input format.
  All paths will be searched for indexes recursively
  
  @param paths the input paths
  @param conf the job conf
  @throws IOException