@Override
    public boolean equals(Object other) {
      if (other instanceof DbHiveLock) {
        return lockId == ((DbHiveLock)other).lockId;
      } else {
        return false;
      }
    }
Used to make another attempt to acquire a lock (in Waiting state)
@param extLockId
@return result of the attempt
@throws LockException
ql/src/java/org/apache/hadoop/hive/ql/lockmgr/DbLockManager.java