@Override
    public void close() throws IOException {
      LOG.info("Closing reader");
      if (reader != null) {
        this.reader.close();
      }
    }
{@link RecordReader} for an {@link WAL} file. Implementation shared with deprecated
HLogInputFormat.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALInputFormat.java