protected function executeCluster(ClusterInterface $connection, \SplQueue $commands)
    {
        $responses = array();
        $sizeOfPipe = count($commands);
        $exceptions = array();

        foreach ($commands as $command) {
            $cmdConnection = $connection->getConnectionByCommand($command);

            if (isset($exceptions[spl_object_hash($cmdConnection)])) {
                continue;
            }

            try {
                $cmdConnection->writeRequest($command);
            } catch (CommunicationException $exception) {
                $exceptions[spl_object_hash($cmdConnection)] = $exception;
            }
        }

        for ($i = 0; $i < $sizeOfPipe; ++$i) {
            $command = $commands->dequeue();

            $cmdConnection = $connection->getConnectionByCommand($command);
            $connectionHash = spl_object_hash($cmdConnection);

            if (isset($exceptions[$connectionHash])) {
                $responses[$i] = $exceptions[$connectionHash];
                continue;
            }

            try {
                $responses[$i] = $cmdConnection->readResponse($command);
            } catch (CommunicationException $exception) {
                $responses[$i] = $exception;
                $exceptions[$connectionHash] = $exception;
            }
        }

        return $responses;
    }
protected function executeCluster(ClusterInterface $connection, \SplQueue $commands)
    {
        $responses = array();
        $sizeOfPipe = count($commands);
        $exceptions = array();

        foreach ($commands as $command) {
            $cmdConnection = $connection->getConnectionByCommand($command);

            if (isset($exceptions[spl_object_hash($cmdConnection)])) {
                continue;
            }

            try {
                $cmdConnection->writeRequest($command);
            } catch (CommunicationException $exception) {
                $exceptions[spl_object_hash($cmdConnection)] = $exception;
            }
        }

        for ($i = 0; $i < $sizeOfPipe; ++$i) {
            $command = $commands->dequeue();

            $cmdConnection = $connection->getConnectionByCommand($command);
            $connectionHash = spl_object_hash($cmdConnection);

            if (isset($exceptions[$connectionHash])) {
                $responses[$i] = $exceptions[$connectionHash];
                continue;
            }

            try {
                $responses[$i] = $cmdConnection->readResponse($command);
            } catch (CommunicationException $exception) {
                $responses[$i] = $exception;
                $exceptions[$connectionHash] = $exception;
            }
        }

        return $responses;
    }
{@inheritdoc}