public int getRangeRowCount() {
      int count = 0;
      for (int[] range : tabletRangeList) {
        count += range[1] - range[0];
      }
      return count;
    }
This entry class stores info for persistence.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/wal/buffer/WALInfoEntry.java