anchor.diff:                            not_found;
                         _ ->
                             #ring_group{
  -                             addrid_nodes_list = AddrId_Nodes} = lists:last(_RingGroupList),
  +                        addrid_nodes_list = AddrId_Nodes} = lists:last(_RingGroupList),
                             case AddrId_Nodes of
                                 [] ->
                                     not_found;
  
positive.code:     %%                                     end, List)
      %%               end, lists:reverse(Ring)),
      {ok, {Checksum, lists:reverse(Ring)}}.
  
  
  %% @doc get redundancies by key.
  
negative.code: %% @private
  find_redundancies_by_vnode_id([],_VNodeId) ->
      not_found;
  find_redundancies_by_vnode_id([#ring_group{index_from = From,
                                             index_to   = To,
                                             addrid_nodes_list = List}|_Rest], VNodeId) when From =< VNodeId,
                                                                                             To   >= VNodeId ->
      find_redundancies_by_vnode_id_1(List, VNodeId);
  