On Fri, Feb 3, 2012 at 12:31 PM, Nicolas Petton <petton.nico...@gmail.com> wrote: > curl > http://localhost:8098/buckets/artists/keys/pink_floyd/albums,author,_ > was nearly immediate, it took 0.156s > > while: > > curl -X POST -H "content-type:application/json" \ > http://localhost:8098/mapred --data @- > {"inputs":[["artists","pink_floyd"]],"query":[{"link":{"bucket":"albums","tag":"author"}},{"map":{"language":"javascript","source":"function(v) > { return [v]; }"}}]} > > Took nearly 2 seconds.
The biggest difference I see is that the link-walk uses an Erlang function where your MapReduce query uses a Javascript function (link-walking is implemented as a MapReduce query internally). Serializing/deserializing to JSON as well as contention for Javascript VMs likely accounts for the lost time. Unfortunately, you can't use exactly the same Erlang function here (riak_kv_mapreduce:map_identity), since the /mapred resource doesn't know how to encode its output to JSON. -Bryan _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
