@Override
  public void readFields(DataInput in) throws IOException {
    record = new WARCRecord(in);
  }
Parses a {@link WARCRecord} out of a {@link DataInput} stream, and makes it the writable's
current record.
hbase-it/src/test/java/org/apache/hadoop/hbase/test/util/warc/WARCWritable.java