I wasn't familiar with what 'Flickr tickets' were so I did a little Google-fu and found this excellent explanation: http://code.flickr.com/blog/2010/02/08/tick

I wasn't familiar with what 'Flickr tickets' were so I did a little Google-fu and found this excellent explanation: http://code.flickr.com/blog/2010/02/08/ticket-servers-distributed-unique-primary-keys-on-the-cheap/ http://code.flickr.com/blog/2010/02/08/ticket-servers-distri...