code: public static <M extends Message>
    void setClassConf(Class<M> protoClass, Configuration jobConf) {
      Protobufs.setClassConf(jobConf,
                             LzoProtobufB64LineOutputFormat.class,
                             protoClass);
    }
docs: Sets an internal configuration in jobConf so that remote Tasks
  instantiate appropriate object for this generic class based on protoClass