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[Uid] Add note about ULIDs not being random in one case #15314

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May 8, 2021
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[Uid] Add note about ULIDs not being random in one case #15314

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7 changes: 7 additions & 0 deletions components/uid.rst
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Expand Up @@ -209,6 +209,13 @@ ULIDs are an alternative to UUIDs when using those is impractical. They provide
128-bit compatibility with UUID, they are lexicographically sortable and they
are encoded as 26-character strings (vs 36-character UUIDs).

.. note::

If you generate more than one ULID during the same millisecond in the
same process then the random portion is incremented by one bit in order
to provide monotonicity for sorting. The random portion is **not**
random compared to the previous ULID in this case.

Generating ULIDs
~~~~~~~~~~~~~~~~

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