@Override
  protected void destruct() {
    if (lockMgr != null) {
      try {
        lockMgr.close();
      } catch (LockException e) {
        // Not much I can do about it.
        LOG.warn("Got exception when closing lock manager " + e.getMessage());
      }
    }
  }
An implementation of {@link HiveTxnManager} that does not support
transactions.  This provides default Hive behavior.
ql/src/java/org/apache/hadoop/hive/ql/lockmgr/DummyTxnManager.java