val thePath = new Path(theHdfsPath)
    val hdfs = org.apache.hadoop.fs.FileSystem.get(
      new java.net.URI(THE_MASTER_URI), 
      new org.apache.hadoop.conf.Configuration())
    val writer = new PrintWriter(hdfs.create(thePath))
    writer.println("toWriteString") // 或者 writer.append(toWriteString)
    writer.close()