gistfile1.txt

{ok, Client} = riak:client_connect('riak@192.168.11.123').
 
 Mine = riak_object:new(<<"groceries">>, <<"mine">>, ["eggs", "bacon"]).
 Yours = riak_object:new(<<"groceries">>, <<"yours">>, ["bread", "bacon"]).
 
 Client:put(Yours, 1).
 Client:put(Mine, 1).
 
 Map = fun(G, 'undefined', 'none')->[G] end. 
 Reduce = fun(Glist, 'none') -> Glist end.
 
 Client:mapred(<<"groceries">>, [{'map', {'qfun', Map}, 'none', false}, {'reduce', {'qfun', Reduce}, 'none', true}]).

// got 

=ERROR REPORT==== 5-Aug-2011::13:03:33 ===
** State machine <0.170.0> terminating 
** Last event in was {riak_vnode_req_v1,
                         22835963083295358096932575511191922182123945984,
                         ignore,
                         {riak_kv_listkeys_req_v2,<<"groceries">>,53547159,
                             <0.432.0>}}
** When State == active
**      Data  == {state,22835963083295358096932575511191922182123945984,
                        riak_kv_vnode,
                        {state,22835963083295358096932575511191922182123945984,
                               riak_kv_innostore_backend,
                               {state,<<"_22835963083295358096932575511191922182123945984">>,
                                      #Port<0.3235>},
                               {dict,0,16,16,8,80,48,
                                     {[],[],[],[],[],[],[],[],[],[],[],[],[],
                                      [],[],[]},
                                     {{[],[],[],[],[],[],[],[],[],[],[],[],[],
                                       [],[],[]}}},
                               false},
                        undefined,none,60000}
** Reason for termination = 
** {'function not exported',
       [{riak_kv_innostore_backend,fold_bucket_keys,
            [{state,<<"_22835963083295358096932575511191922182123945984">>,
                 #Port<0.3235>},
             <<"groceries">>,#Fun<riak_kv_vnode.3.89464844>]},
        {riak_kv_vnode,do_list_keys,6},
        {riak_kv_vnode,handle_command,3},
        {riak_core_vnode,vnode_command,3},
        {gen_fsm,handle_msg,7},
        {proc_lib,init_p_do_apply,3}]}