@Override
    public List<Path> compact(ThroughputController throughputController, User user)
      throws IOException {
      return compactor.compact(request, throughputController, user);
    }
Default StoreEngine creates the default compactor, policy, and store file manager, or their
derivatives.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DefaultStoreEngine.java