This is an interesting topic -- and I'm super-excited that Salvatore is working on Disque! Below are a few methods I've seen for UIDs. Setup used by MongoDB[1

This is an interesting topic -- and I'm super-excited that Salvatore is working on Disque! Below are a few methods I've seen for UIDs. Setup used by MongoDB[1]: [ time, machine_id, process_id, counter ] Twitter Snowflake[2] use something similar to the above. Cassandra[3] use something like this: [ time, version, variant, counter, node_id ] Flickr on their ticket-DB[4] and Instagram on their setup[5]. --- [1] https://github.com/mongodb/bson-ruby/blob/master/lib/bson/object_id.rb#L372 https://github.com/mongodb/bson-ruby/blob/master/lib/bson/ob... [2] https://blog.twitter.com/2010/announcing-snowflake https://blog.twitter.com/2010/announcing-snowflake [3] http://wiki.apache.org/cassandra/TimeBaseUUIDNotes http://wiki.apache.org/cassandra/TimeBaseUUIDNotes [4] http://code.flickr.net/2010/02/08/ticket-servers-distributed-unique-primary-keys-on-the-cheap/ http://code.flickr.net/2010/02/08/ticket-servers-distributed... [5] http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram http://instagram-engineering.tumblr.com/post/10853187575/sha...