Snowflake from Twitter
Source code: https://github.com/twitter-archive/snowflake/tree/snowflake-2010
- ID is composed of:
- time - 41 bits (millisecond precision w/ a custom epoch gives us 69 years)
- configured machine ID - 10 bits - gives us up to 1024 machines
- sequence number - 12 bits - rolls over every 4096 per machine (with protection to avoid rollover in the same ms)
- System Clock Dependency