@Override
  public void abort(String why, Throwable e) {
    LOG.warn("Aborting ReplicationHFileCleaner because " + why, e);
    this.aborted = true;
    stop(why);
  }
Implementation of a file cleaner that checks if an hfile is still referenced by backup before
deleting it from hfile archive directory.
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/BackupHFileCleaner.java