anchor.diff:  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   
   %% @type key() = term(). Key
  +-type(key() :: term()).
   %% @type value() = term(). Value
  +-type(value() :: term()).
   
   process_request_list(TLog, ReqList) ->
       erlang:put(instance_id, process_dictionary:find_group(cs_node)),
  
positive.code:                                        Result2 == ok ->
                                             {{ok, done}, TransLog2};
                                         true ->
                                             {{fail, notfound}, TransLog2}
                                     end;
                                 true ->
                                     {{fail, {key_changed, ReadValue}}, TransLog1}
  
negative.code:     transaction_api:delete(Key, 2000).
  
  %% @doc atomic compare and swap
  %% @spec test_and_set(key(), value(), value()) -> ok | {fail, term()}
  -spec test_and_set(key(), value(), value()) -> ok | {fail, Reason::term()}.
  test_and_set(Key, OldValue, NewValue) ->
      TFun = fun(TransLog) ->
                     {Result, TransLog1} = transaction_api:read(Key, TransLog),
  