I just did my first test-run of a Hadoop cluster on Amazon EC2. It’s not as tricky as it appears, although I ran into some snags, which I’ll document here. I also found these pages helpful: EC2 on Hadoop Wiki and manAmplified.
First, make sure the EC2 API tools are installed and on your [...]
Back in February, in a slightly plaintive post, the W3 sysadmins asked that people stop hammering their servers with requests for XHTML DTDs. Everyone said yes, this is a stupid problem that wouldn’t have happened if a) the XML spec were less dumb, or b) XML libraries were less dumb.
After that post, I spent [...]
Paul Johnson, in the U.K., wrote a piece about how there is no known “process” for programming. At some point, all the theory and methodology goes out the window and someone has to sit down, think about the problem, and write some code.
I’m sure I won’t be the only one to suggest this, but I [...]
The things I don’t know about Java… could fill a book. Here’s a new one, from the Hadoop sources:
public ArrayWritable(Class valueClass) {
// …
}
public ArrayWritable(Class valueClass, Writable[] values) {
this(valueClass);
this.values = values;
}
The second constructor uses the syntax this(arg) to call a different constructor, then follows with initialization code [...]
Joel Spolsky complains that architecture astronauts are taking over at big, rich companies like Google and Microsoft, pushing out elaborate architectural systems that don’t solve actual problems.
He’s right in that smart, technical people like to take on any large, abstract problem that is, as he puts it, “a fun programming exercise that you’re doing because [...]