"Doing crazy stuff in redis" - Fitzy @fritzy from &Yet
* Everything on the internet is feeds in feeds, your follower list, your status updates..
* XMPP pubsub interface, called ZUMP, was XEP60.. it "kinda sucked" and "was really slow"
* I wanted something that fans out messages and was fast and if only there was something that already did that -- well they did, and it was redis.
* Implemented XEP60 in redis, and it was fast and awesome. "And then I had an epiphany"
* "What if we had CRUD events that came out of custom objects that weren't just feeds?"
* "[In node] there are events, and they can interrupt your watch/multi/exec... and life is too short to just crush bugs..."
* "Lua was there so we could implement our own commands.. and we had taken it there.. but we can take it farther[SIC]" .. Henrik asked: "What about ACL or object validation?" .. Yea! .. And then Henrik started driving! But we were doing something crazy, so I was into it...
* The scripts started getting very long... found a crazy hack to call scripts from other scripts.. then started playing with making macros...
* Boss: "Is this a good idea?" Fritzy: "No! But it is AWESOME!"
* Started doing tests, an 800 line lua script can run thousands of times a second on a modest PC.
* It's no longer a database, it is an application service. "It is crazy shit, don't do it!"
Michel Martens - Author of redis.rb and longtime redis contributor
* soveren, cyz, djanowski
* made redis-cli -i, brpoplpush, redis.io, redis-doc, redis-rb
* "Ruby is a community that has a tendency to create loaded tools...at some point, I realized that everyone thinks that what they do is simple.. nobody goes around saying 'I write unneccessarily complex code'..."
* Discussing "Worse is Better", we can focus on completeness or simplicity of implementation even if we leave out some features.
* "I identify with the second group...for people of the other group, simplicity is solving more problems with the same tool"
* (Discussion of 'Shield' vs 'Devise' ruby libraries...) Shield is 100 LOC + 100 LOC for dependencies, Devise is 60,0000 LOC if you include deps (railties, which pulls in 1/2 of rails. Tilt, which has lots of deps as well..)
* LOC is a controversial measure because it favors people who prefer simple implementations.
* "Complex tools are hard to maintain"
* He wants to "use a tool that knows how to handle dependencies, implicit and explicit"
* "The thing with Bundler is that it has to be complex itself...7,000 LOC...very fragile tool... at any time, 300 reported bugs"
* Mote, cuba, shield, ost, ohm.
* Three instances of how Salvatore confronts complexity and deals with it.
* 1. Started small: Existing tools for analytics were too big or too slow
* 2. redis-cli made it interactive when txns added because the client/server had to maintain state. In beginning, it didnt have editing or history. Salvatore hated that readline had more LOC than redis at the time, so he wrote LineNoise
* 3. virtual memory: "in the early days, i was a heavy proponant of vm".."i wanted to use redis for everything.. [when I and others started using it, we realized it was not good and too complex]. So what happened to my dream of using redis for everything?"
* You can either change which tool you're using, or redefine the problem.
* Adding things in redis is easy, removing them is tricky. Created Ohm to wrap common patterns.
* Simple tools let you know not only what is happening, but make it easier to understand things when they go wrong.