Seeing a spike in uncleanlyClosedWALs metric.

  private void tryAdvanceEntry() throws IOException {
    if (checkReader()) {
      readNextEntryAndSetPosition();
      if (currentEntry == null) { // no more entries in this log file - see if log was rolled
        if (logQueue.getQueue(walGroupId).size() > 1) { // log was rolled
          // Before dequeueing, we should always get one more attempt at reading.
          // This is in case more entries came in after we opened the reader,
          // and a new log was enqueued while we were reading. See HBASE-6758
          resetReader(); ---> HERE
          readNextEntryAndSetPosition();
          if (currentEntry == null) {
            if (checkAllBytesParsed()) { // now we're certain we're done with this log file
              dequeueCurrentLog();
              if (openNextLog()) {
                readNextEntryAndSetPosition();
              }
            }
          }
        } // no other logs, we've simply hit the end of the current open log. Do nothing
      }
    }
    // do nothing if we don't have a WAL Reader (e.g. if there's no logs in queue)
  }