Riak Performance of Link Walking vs MapReduce
If you are asked to compare (or you just wonder about) the performance of link walking and map-reduce in Riak keep in mind the following details of how the two mechanism are implemented:
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.
My emphasis on Bryan Fink’s email from Riak’s mailing list.
Original title and link: Riak Performance of Link Walking vs MapReduce (©myNoSQL)
