@Override
  public boolean isMajorCompactionResult() {
    Preconditions.checkState(this.majorCompaction != null, "Major compation has not been set yet");
    return this.majorCompaction.get();
  }
@return the StoreFile object associated to this StoreFile. null if the StoreFile is not a
        reference.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStoreFile.java