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什么是分布式锁？
source link: https://juejin.im/post/5b16148a518825136137c8db
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————— 第二天 —————————————————分布式锁的实现有哪些？1.Memcached分布式锁利用Memcached的add命令。此命令是原子性操作，只有在key不存在的情况下，才能add成功，也就意味着线程得到了锁。2.Redis分布式锁和M
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