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分布式锁实现大型连续剧之（一）：Redis-JavaIT程序员的博客
source link: http://blog.51cto.com/13932491/2163864
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单机环境下我们可以通过JAVA的Synchronized和Lock来实现进程内部的锁，但是随着分布式应用和集群环境的出现，系统资源的竞争从单进程多线程的竞争变成了多进程的竞争，这时候就需要分布式锁来保证。
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