code: public boolean reportChecksumFailure(Path f, FSDataInputStream in,
                                         long inPos, FSDataInputStream sums, long sumsPos) {
      return false;
    }
docs: Report a checksum error to the file system.
  @param f the file name containing the error
  @param in the stream open on the file
  @param inPos the position of the beginning of the bad data in the file
  @param sums the stream open on the checksum file
  @param sumsPos the position of the beginning of the bad data in the checksum file
  @return if retry is neccessary