code: public RemoteIterator<Path> listCorruptFileBlocks(final Path path,
                                                      final boolean useStandby)
      throws IOException {
      return new StandbyCaller<RemoteIterator<Path>>() {
        @Override
        RemoteIterator<Path> call(DistributedFileSystem fs) throws IOException {
          return fs.listCorruptFileBlocks(path);
        }
      }.callFS(useStandby);
    }
docs: {@inheritDoc}
  
  This will only work if the standby avatar is
  set up to populate its underreplicated
  block queues while still in safe mode.