code: protected boolean isFileCorrupt(final DistributedFileSystem dfs, 
        final FileStatus fileStat) 
      throws IOException {
      return isFileCorrupt(dfs, fileStat, false, conf,
          this.numNonRaidedMissingBlks, this.numStrpMissingBlksMap); 
    }
docs: checks whether a file has more than the allowable number of
  corrupt blocks and must therefore be considered corrupt