This is probably exclusively of interest to my coworkers, but MongoDB has a new fail points framework. Fail points make it easier to test things that are hard to fake, like page faults or network errors. Basically, you create a glorified boolean called a fail point, which you can turn on and off while mongod [...]
Suppose that the collection test.foo contained the following documents: {"x": -5} {"x": 0} {"x": 5} {"x": 10} {"x": [0, 5]} {"x": [-5, 10]} {"x": [-5, 5, 10]} x is some combination of -5, 0, 5, and 10 in each document. Which documents would db.foo.find({“x” : {“$gt” : -1, “$lt” : 6}}) return? Click here to [...]
My web app, Noodlin, has two basic functions: 1) create notes and 2) connect them, so I tried to make it blindingly obvious how to do both in the UI. Unfortunately, when I first started telling people about it, the first feedback I got was, “how do you create a connection?” At that point, the [...]
I’ve been working on a web app, Noodlin, for brainstorming online. Basically, Noodlin just lets you create notes and connect them. I’ve been using it for taking notes during meetings, figuring out who gets what for the holidays, and organizing The Definitive Guide. I think it might be handy for people studying for finals this [...]
I’m really happy to share that, in a coordinated effort, all official MongoDB drivers are changing their defaults to return a response from writes today. I think that this is kind of a turning point: MongoDB is finally “newbie safe.” You can just spin up a mongod and it’ll default to journaling being on. Then [...]
I just hit 300 pages! (O’Reilly has a nice system where it automatically compiles my XML into a PDF, so I can obsessively check page count). The last edition topped out at just over 200 pages, which was nice: you could actually sit down and read the thing in a reasonable amount of time and [...]
I was interviewing an potential summer intern yesterday (hey college students, apply to be an intern at 10gen!) and at the end she asked me, “I’ve never been interviewed by a female programmer before. Do you have any advice for me, being a female in a computer science?” I had no idea what to tell [...]
I was working on a section on the gooey innards of journaling for The Definitive Guide, but then I realized it’s an implementation detail that most people won’t care about. However, I had all of these nice diagrams just laying around. Good idea, Patrick! So, how does journaling work? Your disk has your data files [...]
If you don’t own one, go order an old-school hot water bottle. You can get one on Amazon for ~$10 and they feel amazing when you have a fever and your feet are freezing. They are also super-easy to use: just fill it up with hot tap water and they let out a nice even [...]
Often I’ll fix a bug (call it “bug A”), kick off some tests, and then get stuck. I’d like to start working on bug B, but I can’t because the tests are running and I don’t want to change the repo while they’re going. Luckily, there’s a git tool for that: git-new-workdir. It basically creates [...]
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