code: def force_clear_lock(self):
          '''Kick out whoever currently owns the namespace global lock.
          This is intended as purely a last-resort tool.  If another
          process has managed to get the global lock for a very long time,
          or if it requested the lock with a long expiration and then
          crashed, this can make the system functional again.  If the
          original lock holder is still alive, its session calls may fail
          with exceptions.
          '''
          return redis.Redis(connection_pool=self.pool).delete(self._lock_name)