private function saveHashmap()
    {
        try {
            return \apc_store($this->_hashmapId, $this->_hashmap, self::HASHMAP_TTL);
        } catch (\Exception $e) {
            $this->log('warning', \sprintf('Unable to store hashmap %s : %s', $this->_hashmapId, $e->getMessage()));

            return false;
        }
    }