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【Q020】如何实现一个分布式锁 #21

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shfshanyue opened this issue Nov 9, 2019 · 2 comments
Open

【Q020】如何实现一个分布式锁 #21

shfshanyue opened this issue Nov 9, 2019 · 2 comments
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redis server

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@shfshanyue
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@zhangxiaokun
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mysql,redis,zk redis效率较高

@shfshanyue
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shfshanyue commented Nov 12, 2019 •
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多节点部署就会产生分布式问题，分布式锁由两个词组成，分布式和锁

  1. 分布式: 解决分布式问题就要找一个大家都能够访问到的中介，比如 Redis，Consul，Zookeeper
  2. 锁: 解决原子问题，当不存在时便加锁，不存在 和 加锁 要作为原子进行操作

以下是一个 redis 实现的操作

# EX 100：100s 的过期时间
# NX: 如果不存在 User:10086，设置成功返回 OK，否则返回 nil，也就是说 100s 之内只有第一次操作返回 OK
set User:10086 Random:shanyue EX 100 NX

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@shfshanyue @zhangxiaokun