The Clojure brain behind 40 billion req/day

speaker: Yu Dapeng event: ClojureSG #4 ** pocket math app – request for ad –> exchange –> pocketmath real time ad bidding max 100ms for reply to exchange 40 billion req/daq from exchange ** cumbersome for customer to specify how much per order add a higher abstraction of campaign ** allocation algorithm as a function (f pyramid spend buffer when) => [allocation] implemented as a generic method ** in-memory transactions dosync ref-set ** logging each state change ** production problems going over the log programatically replay it in repl to debug using the same version of the code ** challenges IDEs imperative mind set keep it simple, can always rewrite?