@Override
    public long skip(long n) throws IOException {
      long result = in.skip(n);
      bytesRead += result;
      return result;
    }
Returns the proportion of the file that has been read, as a number between 0.0 and 1.0.
hbase-it/src/test/java/org/apache/hadoop/hbase/test/util/warc/WARCFileReader.java