Hi,
I am following the Erlang Map Reduce example found here:
https://wiki.basho.com/display/RIAK/MapReduce#MapReduce-MapReduceviatheErlangAPI
I completed the example successfully with the intended result.
But, initially, I received an unintended result when creating a
separate object for each value:
> O0 = riak_object:new(<<"groceries">>, <<"mine">>, ["bread"]).
> Client:put(O0, 1).
> O1 = riak_object:new(<<"groceries">>, <<"mine">>, ["cheese"]).
> Client:put(O1, 1).
> O2 = riak_object:new(<<"groceries">>, <<"yours">>, ["bread"]).
> Client:put(O2, 1).
> O3 = riak_object:new(<<"groceries">>, <<"yours">>, ["butter"]).
> Client:put(O3, 1).
The result was:
> [{"bread", 2}]
and not
> [{"cheese", 1}, {"bread", 2}, {"butter", 1}]
My question is WHY is there a difference? If you enter multiple
values via multiple objects for the same bucket and key, do the map
reduce functions not operate over all of the values?
Any insights much appreciated.
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