The UUIDs contain: IP address, startup time of the JVM(accurate to a quarter second), system time and a.
换句话说,每秒产生10亿笔UUID,100年后只产生一次重复的机率是50%。
In other words, only after generating 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%.
The UUID contains: IP address, startup time of the JVM(accurate to a quarter second), system time and a.
版本4"变体2UUID(传统GUID)的可能有一半,因为可用的随机位少一个,变量消耗3bits。
There are half as many possible version-4 variant-2 UUIDs(legacy GUIDs) because there is one less random bit available, 3 bits being consumed for the variant.
UUID的目的是使分布式系统能够在没有重要中央协调的情况下唯一地识别信息。
UUID is normally used in software construction to enable distributed systems to uniquely identify information without significant central coordination.
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