count_keys.rb

require 'rubygems'
require 'riak'
require 'json'
require 'benchmark'
require 'pp'

$client = Riak::Client.new :protocol => :pbc

def count_all_keys
  mr = Riak::MapReduce.new($client).
    add("events").
    map("function(v) { return [1]; }").
    reduce("Riak.reduceSum", :keep => true)

  results = mr.run
  p results
  puts
end

puts Benchmark.measure { count_all_keys }