anchor.diff:  finish_delta_ack1(State, OldSlideOp, ReplyPid) ->
       % handover lease to succ
       comm:send_local(ReplyPid, {continue}),
  -    log:log("finish_delta_ack1~n", []),
  +    %log:log("finish_delta_ack1~n", []),
       {ok, State, OldSlideOp}.
   
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
positive.code:         -> {ok, dht_node_state:state(), slide_op:slide_op()}.
  prepare_send_delta1(State, OldSlideOp, ReplyPid) ->
      % start to split own range
      log:log("prepare_send_delta1 ~p~n", [slide_op:get_type(OldSlideOp)]),
      case find_lease(State, OldSlideOp, active) of
          {ok, Lease} ->
              Id = l_on_cseq:id(l_on_cseq:get_range(Lease)),
  
negative.code: -spec prepare_join_send(State::dht_node_state:state(), SlideOp::slide_op:slide_op())
          -> {ok, dht_node_state:state(), slide_op:slide_op()}.
  prepare_join_send(State, SlideOp) ->
      %log:log("prepare_join_send", []),
      % can be ignored for leases
      {ok, State, SlideOp}.
  
  