Is monotonicity within the same millisecond implemented?

[sergeyprokhorenko]

Hi Dmitriy,
Have you implemented the monotonicity of ULIDs within the same millisecond?
See:

• https://github.com/ulid/spec#monotonicity (increment of random part)
• https://github.com/Sofya2003/ULID-with-sequence#specification (sequence after timestamp)

[RPG-18]

Hi. Yes i got implementation from https://github.com/oklog/ulid/blob/master/ulid.go. But idea ULID with sequence seems interesting. We can store shard id. I will append functions on next weekend.

[sergeyprokhorenko]

I would not recommend making the shard ID mandatory, as in most cases sharding by timestamp of last use is preferable. Outdated data is archived on a tape drive :)

I think there is a very few data that depends on the Instagram style shard ID (on specific user, product or whatsoever).

Nevertheless, there can be a separate function with shard ID too.

[sergeyprokhorenko]

To order ULIDs by creation time, the shard ID must be between the sequence and the random part, or after the random part with increment.

[sergeyprokhorenko]

... after the incremented random part.