anchor.diff:      case Ret of
           ok -> void;
           {error, _} ->
  -            %% @TODO >> enqueue
  +            %% @TODO enqueue a message (fail distribution of launch-info to a target-node)
               ok
       end,
       rebalance_3(Rest, RebalanceProcInfo);
  
positive.code: 
  
  %% @private
  rebalance_5({takeover, Node},_) ->
      recover(?RECOVER_BY_NODE, Node, true);
  
  rebalance_5([], []) ->
      ok;
  rebalance_5([], Acc) ->
  
negative.code: %% @doc Do Rebalance which affect all storage-nodes in operation.
  %% [process flow]
  %%     1. Judge that "is exist attach-node OR detach-node" ?
  %%     2. Distribute every storage node from manager
  %%     3. Confirm callback.
  %%
  -spec(rebalance() ->
               ok | {error, any()}).
  