    # File lib/active_support/vendor/memcache-client-1.5.1/memcache.rb, line 303
      def incr(key, amount = 1)
        server, cache_key = request_setup key

        if @multithread then
          threadsafe_cache_incr server, cache_key, amount
        else
          cache_incr server, cache_key, amount
        end
      rescue TypeError, SocketError, SystemCallError, IOError => err
        handle_error server, err
      end