pvary commented on issue #12660:
URL: https://github.com/apache/iceberg/issues/12660#issuecomment-2757577064

   Theoretically the UUID could conflict, but the probability is very low. See: 
https://en.wikipedia.org/w/index.php?title=Universally_unique_identifier&oldid=755882275#Random_UUID_probability_of_duplicates
   
   > To put these numbers into perspective, the annual risk of a given person 
being hit by a meteorite is estimated to be one chance in 17 
billion,[[5]](https://en.wikipedia.org/w/index.php?title=Universally_unique_identifier&oldid=755882275#cite_note-5)
 which means the probability is about 0.00000000006 (6 × 10−11), equivalent to 
the odds of creating a few tens of trillions of UUIDs in a year and having one 
duplicate. In other words, only after generating 1 billion UUIDs every second 
for approximately 100 years would the probability of creating a single 
duplicate reach 50%.
   
   If you have faced the issue, then you might have some entropy issues with 
the random generator of the system.
   


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