hash_ring is a pure Ruby implementation of consistent hashing. hash_ring is based on the original Python code written by Amir Salihefendic. A comprehensive blog post detailing the methods and reasoning for such a library can be viewed by visiting the following URL:
require 'rubygems' require 'hash_ring' memcache_servers = ['192.168.0.111:14107', '192.168.0.112:14107', '192.168.0.113:14108'] # Since server 1 has double the RAM, lets weight it # twice as much to get twice the keys. This is optional weights = { '192.168.0.111' => 2 } ring = HashRing.new(memcache_servers, weights) server = ring.get_node('my_key')
sudo gem install mitchellh-hash_ring