We held the first meeting of the BACUG (ugh, that’s a tedious acronym) last week, on Thursday the 5th of February. I was expecting about 6-8 people to show up, but we had about 12 people, quite a nice turn out!
After introductions and such, Chris Turner presented his unit-testing library for clojure called Clojure Spec. We talked about testing in general, and because he uses a lot of macro-writing macros in his code, we talked about macros in general and the difficulty in debugging macros. It was a good discussion – though I did throw in (tongue-in-cheek) that we’re using Test Is at Cinch. Thanks Chris, it was a good presentation.
After that talk, I gave an introduction to how we’re presently using Clojure in our startup. Since we’re using HBase as our persistent data-store, and processing that data using a bunch of clojure processes, we talked about data-modeling for HBase-like systems (I will write about my implementation of that data-model in another post).
An interesting thread came up – led by Joe Mikhail who works at Google and obviously does a lot of Map/Reduce/BigTable stuff – around how at least in the beginning, multi-threaded clojure processes can be used in place of Hadoop when processing HBase data. And he did mention that using systems like Terracotta, one can scale up such solutions. We’re going to look into that next week.
The remainder of the meeting went by in a buzz of talking about different languages, technologies, and general geek topics. The one thing of interest here was the point that software transactional memory is no panacea (surprise!) to the whole concurrency thing. Here’s an ACM article (there are several actually, just keep turning the pages) that throws some light on the issue. Here’s another.
Overall, it was a very good meeting – we’re hoping that the next one would be attended by more people, and especially some folks that have used other Lisps in the past – we’re all curious about what such folks think about Clojure. Indeed, and we want to learn from their experience in using idiomatic Lisp.
I’m thinking that we’ll do another Clojure meetup in about 6 weeks or so… join up, and stay tuned!
P.S. – A shout of thanks to my employer Runa. for hosting this meeting.