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预减库存preReduceProdStock的问题 #12

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wangjia2016 opened this issue Nov 5, 2020 · 1 comment

wangjia2016 commented Nov 5, 2020

redisTemplate.opsForValue().decrement(prodId,number)

1、利用redis的原子性减库存会更合适吧

2、这里的预减库存，多个jvm实例的情况下，synchronized应该是没有锁住的，是用类似redisson 分布式锁来控制

zlq0527 commented Feb 8, 2023

他Redis里放的不是库存个数，而是商品Id对应的商品对象，所以它使用了这种方式，如果他Redis 里放的是商品ID，商品库存就是用Redis的Decr命令更合适。
这个问题很好，他这个秒杀应该是单机的单实例 syn也暂时够用，如果上分布式就要用redis的分布式锁了

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