anchor.diff:  %%              Payload of the operation
   %%              OpId: Unique operation id
   %%      Output: {ok, {vnode_id, op_id}} | {error, Reason}
  +%%
   handle_command({append, LogId, OpId, Payload}, _Sender,
                  #state{logs_map=Map, partition=Partition}=State) ->
       case get_log_from_map(Map, LogId) of
  
positive.code: %%              actual log
  %%      Return: true if all logs are empty. false if at least one log
  %%              contains data.
  -spec no_elements(LogIds::[[Partition::non_neg_integer()]], Map::dict()) -> boolean().
  no_elements([], _Map) ->
      true;
  
negative.code: %%                           type.
  %%      Return:         LogsMap: Maps the  preflist and actual name of
  %%                               the log in the system. dict() type.
  %%
  -spec open_logs(string(), [preflist()], non_neg_integer(), dict()) ->
      dict() | {error, reason()}.
  open_logs(_LogFile, [], _Initial, Map) ->
  