You can also add KeyData to pass along to the next phase, which can be really powerful. See also http://blog.basho.com/2010/04/14/practical-map-reduce:-forwarding-and-collecting/
Sean Cribbs <s...@basho.com> Developer Advocate Basho Technologies, Inc. http://basho.com/ On Jun 11, 2010, at 7:30 AM, Thomas Heller wrote: > Hi, > > so if I understand that right (and the erlang api seems a little > easier to understand in that regard): > > If I want multiple map phases, the "previous" map phase basically just > acts as a filter/expansion for the input data. If I emit a {Bucket, > Key} term Riak will then load this document and pass it into the next > phase. So if I have a Document with multiple references to others I > may expand the input data running a map phase which basically just > emits those links as {Buckey, Key} terms. Basically a (huge) > optimization over doing something similar on the client side. > > Dont have a great example right now, but I get the idea (I think). > > Thanks, > /thomas > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
