@Override
  protected boolean isCacheEnabled() {
    return MetastoreConf.getBoolVar(conf,
            MetastoreConf.ConfVars.COMPACTOR_CLEANER_TABLECACHE_ON);
  }
A class to clean directories after compactions.  This will run in a separate thread.
ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Cleaner.java