public boolean shouldSeek(TimeRange tr, long oldestUnexpiredTS) {
    return !isEmpty() && (tr.isAllTime() || timeRangeTracker.includesTimeRange(tr))
      && timeRangeTracker.getMax() >= oldestUnexpiredTS;
  }
Get cell length after serialized in {@link KeyValue}
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/Segment.java