PHP redis makes high burst spike

Why do you say redis It can support high burst ？

Click to see why redis Can support high burst

Concrete realization

public function index13(UserService $userService)
{
	// monitor goods_num  Commodity inventory , If at update time , The inventory of goods has changed （ Modified by other processes ）, Will not be updated successfully 
    Redis::watch('goods_num');
    $goods_num = Redis::get('goods_num');
    if($goods_num > 0)
    {
        $result = Redis::transaction(function(\Predis\Transaction\MultiExec $redis) use($goods_num){
           // Atomic manipulation 、 Either they all succeed , Or it didn't work 
            $redis->decr('goods_num')->lpush('goods_num_list_1',$goods_num);
        });

        // Whether the transaction was successfully executed 
        if($result)
        {
            $userORM = $userService->get('1');

            $userORM->increment('versionId',1);
        }

        return 'success';
    }else{
        return 'error: Inventory has been exhausted ';
    }
}

1、 First, we need to listen that the value of the inventory field cannot change during the operation of our program , Otherwise, dirty data will be generated .
2、 We should write a queue mechanism , After the second kill , Will save as redis Add and create the order data of users who have succeeded in seckilling in .