if except_vnh && except_vnh.key?(vn) || Time.now.to_i > expt
              count += 1
              sleep @each_vn_dump_sleep if count % @each_vn_dump_sleep_count == 0
            else
              yield [vn, last, clk, expt, k.length, k, val.length, val].pack("NNNNNa#{k.length}Na#{val.length}")