@Override
    public List<HStoreFile> preSelect(List<HStoreFile> filesCompacting) {
      return compactionPolicy.preSelectFilesForCoprocessor(storeFileManager, filesCompacting);
    }
Represents one instance of stripe compaction, with the necessary context and flow.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StripeStoreEngine.java