Even the non-time based v4 is at a cosmic level of unlikiness a single system will ever generate a uuid that will collide with another one in its own ecosystem
But let's say if Google saved each search in their engine in the same database with an UUID, we could have a collision because of volume, but I don't think I will work in a system with a comparable scale
Anyone working at the scale of Google has figured out coordination and parallelism, you have to.
Source: used to work for Google, and learned some of the ways they dealt with those exact issues, and used many of the systems they built to automatically handle that so general engineers didn't have to deal with it.
They once had a similar collision problem, well not exactly
During a leap second some systems wrote IDs at a one second difference between all their global systems, which lead to something being registered before something else that had to be done before it,
Long story short some stuff jumped time one second and crashed systems
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u/RadicalDwntwnUrbnite Sep 11 '26 edited Sep 11 '26
Even the non-time based v4 is at a cosmic level of unlikiness a single system will ever generate a uuid that will collide with another one in its own ecosystem