Example of Segmenting Caches in Rails Apps

cache_segmentation_environment.rb

revision_file = Rails.root.join('REVISION')
if File.exist?(revision_file)
  revision = File.read(revision_file).match /[a-f,0-9]{6}$/
end
config.cache_store = :mem_cache_store, memcache_host, {
    :namespace => "volatile-#{ revision ? revision[0] : '0'}"
}
config.action_controller.cache_store = :mem_cache_store, memcache_host, {
    :namespace => 'stable'
}