instance method with_server

# File activesupport/lib/active_support/vendor/memcache-client-1.7.4/memcache.rb, line 824
  def with_server(key)
    retried = false
    begin
      server, cache_key = request_setup(key)
      yield server, cache_key
    rescue IndexError => e
      logger.warn { "Server failed: #{e.class.name}: #{e.message}" } if logger
      if !retried && @servers.size > 1
        logger.info { "Connection to server #{server.inspect} DIED! Retrying operation..." } if logger
        retried = true
        retry
      end
      handle_error(nil, e)
    end
  end