请参阅fileoutputformat.java中的以下方法，它在内部调用已删除的方法调用。
i、 e setcompressoutput（conf，true）；
这意味着您正在尝试应用gzip codec类，然后很明显它是一个指向应该压缩输出的代码的指针。不是吗？

/**
   * Set whether the output of the job is compressed.
   * @param conf the {@link JobConf} to modify
   * @param compress should the output of the job be compressed?
   */
  public static void setCompressOutput(JobConf conf, boolean compress) {
    conf.setBoolean("mapred.output.compress", compress);
  }
  /**
   * Set the {@link CompressionCodec} to be used to compress job outputs.
   * @param conf the {@link JobConf} to modify
   * @param codecClass the {@link CompressionCodec} to be used to
   *                   compress the job outputs
   */
  public static void 
  setOutputCompressorClass(JobConf conf, 
                           Class<? extends CompressionCodec> codecClass) {
    setCompressOutput(conf, true);
    conf.setClass("mapred.output.compression.codec", codecClass, 
                  CompressionCodec.class);
  }