elasticsearch is a wrapper around Lucene that supports distributed, scalable search, particularly compatible with Amazon’s EC2 setup. The fun part about elasticsearch is the installation and setup (on a Mac): step 1) download it.step 2) unzip that file.step 3) go to that directory and run bin/elasticsearch Done. Ready to go. Proceed with inserting data. Except! …
There are a zillion examples of what to type to insert into elasticsearch. But what does each part mean? Shoving information into elasticsearch is pretty easy. You don’t have to set anything up. (so, if you have a typo, good luck figuring out later where your data went. This is the price of sensible defaults.) …
Read moreInserting data into elasticsearch over HTTP: a breakdown
SICP insight of the day: iterative programming doesn’t require a for loop. Tail recursion is iterative programming. It looks very close to recursion, but the distinction is: a program is iterative if everything it needs is stored in a few state variables. In an imperative style the state is stored in mutable variables. In a …
test { exclude ‘**/Manual*’} this is here because I know I will forget it.
The previous post discussed advantages of using a continuation style to send our code to the data instead of making our code wait for the data to come back to it. This pseudocode example has three I/O operations, each encasing the operations which should follow in a callback function parameter. let filename = // calculate …
Object-oriented code was conceived as message-passing between objects. Service-oriented architecture emphasizes delegation to another system. The entire web is a whole bunch of requests flying around. There is one clear way to be efficient about this: stop waiting for results. When we’re writing imperative code, we want to write the operations in the order they …
Read moreBring the data to the code, or the code to the data?
Michael Feathers has a great blog post up today about how object-oriented and functional programming styles are suited to different portions of an application. Specifically, the object-oriented style fits the high-level application components. The original intention of OO was for objects to pass messages to each other, which is suited to a SOA style and …
It is often said that the developer should understand one level deeper than she’s working. If she’s writing Java, she should know how the JVM works. If he’s using a container, he should know conceptually what’s going on inside the container. This statement is true for more than just runtimes and frameworks, but all the …
Say you’re working along on a branch (let’s say master), and suddenly you realize that this task is harder than you thought. You wish you had started a branch for this feature, back before you began it. Now you need to work on a bug instead, so you’ve got to put these changes away — …
Git gives us all this amazing power to control what we commit and when. We can even go back and modify commits to rewrite history. This power is dangerous. What’s the point of having it? The reason is that our version control history tells a story of our project. It is up to us what …