分布式锁
License: GNU General Public License v3.0
1.采用redis实现分布式锁，单台redis实现分布式锁，防止单点故障，可以采用红锁方式来做
问题1: 如果设置key的有效期过期了，但是业务还没有执行完。
解决方式是自己手动续约，按照有效期的n/3来延长key的的时间，具体时间需要根据业务压测 得出来
2.采用开源redisson来实现分布式锁，它内部已经实现了续期，默认key的有效期是30s, key的续期时间为10s,防止单点故障，可以采用红锁方式来做。
采用Zookeeper来实现分布式锁，zookeeper客户端curator提供分布锁的实现
mysql实现分布式锁(采用ThreadLocal + 数据库主键冲突)
RedisLockRegister来实现分布式锁(采用本地锁+redis来做)
总结：至于选择哪种方式需要根据项目需求和架构来选型，个人认为在大项目中采用zookeeper来实现分布式锁是最可靠的
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