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线程锁：主要用来给方法、代码块加锁。当某个方法或代码使用锁，在同一时刻仅有一个线程执行该方法或该代码段。线程锁只在同一JVM中有效果，因为线程锁的实现在根本上是依靠线程之间共享内存实现的，比如synchronized是共享对象头，显示锁Lock是共享某个变量(state)。

很多人在对比两者时，其实并不知道MPP的含义究竟是什么、两者的可比性到底在哪里。实际上，当人们在对比两者时，与其说是对比架构，不如说是对比产品。虽然MPP的原意是“大规模并行处理”，但由于一些历史原因，现在当人们说到MPP架构时，它们实际上指代的是“分布式数据库”，而Hadoop架构指的则是以Hadoop项目为基础的一系列分布式计算和存储框架。不过由于MPP的字面意思，现实中还是经常有人纠结两者到底有什么联系和区别开元棋牌官网最新，两者到底是不是同一个层面的概念。

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皇冠足球博彩欧洲杯中国进入几强 | “发布声明拒却富士康代工恳求”？华为辟谣

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