protected void internalAdd(ExtendedCell cell, boolean mslabUsed, MemStoreSizing memstoreSizing,
    boolean sizeAddedPreOperation) {
    boolean succ = getCellSet().add(cell);
    updateMetaInfo(cell, succ, mslabUsed, memstoreSizing, sizeAddedPreOperation);
  }
Returns the Cell comparator used by this segment
@return the Cell comparator used by this segment
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/Segment.java