I’ve never been to a QCon before and being run by the same organisers of JAOO and the folks behind the ever popular InfoQ, I was looking forward to being both an attendant and presenter. Lasting three conference days and two tutorial days, this conference focuses mainly on being talked at – quite a different experience to the Agile 20xx and the XP 20xx conferences I normally run workshops/talks at. Being focused on the cutting edge and practical technologies side, I can really understand this because it’s hard to target people with the right level of experience.
Talking to most of the attendees, it also attracts a noticeably different side with the majority of people already in architect or senior developer roles with a relatively smaller proportion of people in other ancillary roles such as PMs, testers or BAs.
Feedback that works
I like the feedback note for the conference, asking people tweet, email or talk to people at the conference. I think some of the feedback mechanisms even worked as we saw a lack of caffeine/water during the breaks on the first day change for the other remaining days.
The Keynote
The first day’s keynote started with the evangelical Uncle Bob Martin. He’s a great speaker and channels a lot of opinion towards the crowd wandering back and forth on stage. I saw a version of this at the Agile 2009 conference. I’m glad he adjusted it somewhat more appropriately for this conference. He talked about some good principles that should be followed after a few bumpy technical glitches. He is all about the drama (which I guess is part and parcel of a keynote) such as showing us a video that scrolled through a single java class for something like two to three minutes backed up by a song from the movie from 2001 (thanks Ola!) that almost sounded like the flight of the bumblebee. The point of this showmanship was to demonstrate how we can sense bad code visually without even looking at the specifics. He went through a number of his mantras such as “The Boy Scout” rule, leaving things better than how you found them, or that functions should be no more than four or five lines long.
Whilst I don’t think I learned anything new, Uncle Bob Martin was entertaining and had good things to say, despite how preacher-like he comes across.
Track: Architecture’s You’ve Always Wondered About – Session: BWin – P5 a future proof poker platform
The rest of the day was split into six different tracks. I went to the first of these and was truly disappointed. The two presenters came from BWin, apparently one of the largest poker and gaming sites in Europe. They spent half an hour talking about their problems of performance (many of the -iliites) and where the history of their application came from. They even had to include a three minute video from their marketing folks. They finally flashed up a screenshot of their architecture diagram which I think everyone had come to hear about it. Unfortunately they moved onto the next screen very quickly and said that they couldn’t actually talk about their architecture. How disappointing! Indeed this might have been an “Architecture You’ve Always Wondered About”, and after this session was one to still, indeed, wonder about it.
They proceeded to pick a single example about two processes that concurrently wrote and read from the same database table and their architectural change simply transitioning it to a disk persistent queue and the reporting service reading from that queue and writing to its own database. Neither very profound, or a very interesting tidbit that failed to give the audience any more insight into any interesting part of how they architected their system.
I found it interesting they spent a long time (something like 250 man years) rewriting this version of their architecture so I asked the question about how they went about moving from their old to their new platform at which they pretty much described a big bang approach – neither iterative or incremental. Pretty disappointing.
My lesson learned from this: Regardless of how pretty your slides are, make sure your abstract matches what you’re going to actually talk about.
Track: Dev and Ops: A Single Team – Session: Devs and Ops Cooperation when the Worst Happens
My next session was much more fulfilling with Michale Nygard (author of Release It) describing some of the stories that were the basis for the book but wouldn’t have been publishable. Michael is really down to earth and happy to chat about many of the details behind the book. It’s really obvious that he is also a very pragmatic person, understanding that models are just that and recommending people look into the details because there is often something much more complex underneath.
Many of the things that Michael talked about also resonated very strongly with ideas that I’ve seen on applications. Many of them included focusing on ensuring documentation artefacts should be tested by those who will consume them. As he put it, “UML is virtually useless to the deployment and operations team”. Other gems included, “From a high enough view, everything starts to look the same”
His stories also reinforced the importance of having a ubiquitous language will all members of the company in the shared domain. One of his most successful rescue missions dealing with a production problem only worked because the architect (on the dev side) and Michael (on the ops side) understood enough to really communicate the real problems. Michael also kept (understandably) hammering home the point of lack of information on both sides really hurts the problem solving process.
A lot of Michael’s stories also described their successes working around the existing (organisational) systems in order to deal with the problems at hand. To me, this was just another great example of organisations that structure themselves for efficiency over effectiveness.
I like the way that Michael finished off his talk as well, focusing on the fact that you’re not just trying to build software, that you need to care about the organisation (and I would also argue, the systems and procedures in that organisation) that support the software. Design them for effectiveness, not efficiency.
Architectures you’ve always wondered about: Facebook
The next session I attended was by Aditya Agarwal (one of the engineering directors of Facebook). He shared some great insights and lessons learned into what things Facebook did that got them to where they were. Admittedly they had some strange choices like writing something that converted PHP into compiled C++ and using MySQL is a very “reliable bitstore”.
They have a lot of great things to say, like being very proud of the low number of engineers ratio to actual users. Like Alistair, I’m puzzled why they’re secretive of the exact number of their employees.
Aditya has some good things to say and although he means well, I don’t support everything that he says. it’s obvious a lot of what he says is based on a start up culture. Things like, “don’t worry about it until it becomes a problem” encourages the recklessness we see in many software companies. Same thing about the choice of programming language such as “every programming language will have problems at our scale”.
On the plus side, I was pleased to hear them encouraging the innovative engineering culture that I don’t see in many organisations.
Track: Non relational DBs and Web Oriented Data – Session: Social networks and the richness of data: getting it done with
After going through my notes the most interesting tidbit was about using a partitioning mechanism to deal with data updates based on the number of connections. There was plenty of buzzwords (both internal and external) that I think I had a hard time fitting it all together. Some things I’m going to look at include:
- Bit versus bloom filters – Not familiar with this term or how to use it.
- Tools – RESTeasy (I now see it’s a JBoss project). Redis and Voldemort – something they used heavily all over the place.
That’s about all I got out of this session though I’m not sure if it was about the lack of familiarity with the tools, or the excessive use of acronyms and unfamiliar terms or just plain tiredness.
Track: Functional Programming – Session: Demystifying Monads
Josh Graham did a great job stepping into fill in for his ill wife talking through some of the different ideas behind monads. I haven’t done functional programming since university and I’ll be the first to admit Monad’s are still a mystery to me but I came away with some key learnings.
Firstly, to understand monads properly, you really just have to see several examples in action. There’s a high barrier to entry because it means:
- Learning a new language
- Learning a new development environment
- Playing with plenty of examples
When I find some time, I’ll do those. In the meantime, I understand a bit more about the properties of a monad, and that they can be a powerful abstraction for functional languages.
Final keynote – Dan Ingalls: Forty Years of Fun with Computers
For being so late in the day, this was a very entertaining keynote. Just like any modern day small talk person, this entire demonstration took place in the Squeak development environment. Dan demonstrated some interesting and interactive elements.
I had a few key takeaways including:
- We’re really bad at learning the lessons from the past. Partially because we don’t have enough storytellers and that our generation doesn’t listen very well.
- I’m going to read this article at some point.
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