@Override
  public Iterator<HStoreFile> updateCandidateFilesForRowKeyBefore(
    Iterator<HStoreFile> candidateFiles, KeyValue targetKey, Cell candidate) {
    // Default store has nothing useful to do here.
    // TODO: move this comment when implementing Level:
    // Level store can trim the list by range, removing all the files which cannot have
    // any useful candidates less than "candidate".
    return candidateFiles;
  }
List of compacted files inside this store that needs to be excluded in reads because further
new reads will be using only the newly created files out of compaction. These compacted files
will be deleted/cleared once all the existing readers on these compacted files are done.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DefaultStoreFileManager.java