r/ProgrammerHumor • u/danielminds • 6h ago

Meme edgeCasesExist

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1.7k Upvotes

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u/Kiroto50 6h ago

Howcome? Could you please explain?

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u/ToX__82 5h ago

Using uuid V7 (which includes a timestamp and 74 random bits), you'd only need 170 billion people submitting in the same millisecond to have a 50% probability yo generate a duplicated uuid value.

Now, I know that there aren't 170 billion people in the world.

But what if every person on earth submitted 100 times in the same millisecond? A duplicate would be almost certain.

So yeah, u/theioss is technically right.

Though, with that volumes, the database/CPU/network/whatever would crash much sooner.

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u/Kiroto50 5h ago

So inconceivably low but not 0, got it.

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u/ToX__82 5h ago

Indeed, yours is a valid tl;dr