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Twitter's Snowflake UUID generator in Erlang.
29 Commits 5 Branches 4 Tags 184 KiB
Erlang 98.1%
Makefile 1.9%
0.1.2
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Joseph Abrahamson 7a8eab0f12 Returning to the original rebar dep methods.
2012-07-25 18:28:48 -04:00
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test Major changes to the package and design! 2012-06-13 01:43:18 -04:00
.gitignore Initial commit. 2012-06-08 10:00:39 -04:00
Makefile Major changes to the package and design! 2012-06-13 01:43:18 -04:00
README.md * README.md: Todos added 2012-06-28 13:38:45 -04:00
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rebar.config Returning to the original rebar dep methods. 2012-07-25 18:28:48 -04:00

README.md

Snowflake: a 64-bit UUID generator

Original design by Twitter.

1> application:start(snowflake).
2> snowflake:new().
<<0,231,97,68,12,192,0,0>>
3> snowflake:serialize(snowflake:new()).
<<"AOdiTg5AAAA=">>
4> sets:size(sets:from_list([snowflake:new() || _I <- lists:seq(1,100000)])).
100000
5> lists:map(fun ({T, _}) -> T end,[timer:tc(snowflake, new, []) || _I <- lists:seq(1,100)]).
[93,46,42,42,42,53,55,43,42,43,73,36,34,33,39,52,48,39,35,
 54,36,34,33,34,40,35,33,33,34|...]

To do

  • Fix for NTP adjustments

    Sometimes NTP will repeat milliseconds, but this violates the strict ordering of snowflake. Snowflake should keep track of the last seen time and wait until NTP catches back up so as to ensure monotonicity.