code: private static int readDFSPaths() {
    	if (listDFSPaths() != 0) {
    		return -1;
    	}
    	
    	try{ 
  	  	for (Map.Entry<String, OutputStream> file : files_.entrySet()) {
  	  		
  	  		long startTime = System.nanoTime();
  	  		DFSInputStream os = dfsClient_.open(file.getKey());
          timingOpen_.add(new Double((System.nanoTime() - startTime)/(1E9)));
          
  	  		os.read();
  	  		os.close();
  	  	}
    	} catch (IOException e) {
    		e.printStackTrace();
    	}
    	
    	return 0;
    }
docs: lists, and then reads the first byte in all of the files in
  this hostname/process' namespace
  @return -1 on error, 0 on success