@InterfaceAudience.Private
  void setCheckForFullyBackedUpTables(boolean b) {
    checkForFullyBackedUpTables = b;
  }
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