@Override
    public boolean nextKeyValue() throws IOException {
      try {
        WARCRecord record = reader.read();
        key.set(reader.getRecordsRead());
        value.setRecord(record);
        return true;
      } catch (EOFException eof) {
        return false;
      }
    }
Always returns false, as WARC files cannot be split.
hbase-it/src/test/java/org/apache/hadoop/hbase/test/util/warc/WARCInputFormat.java