Chris Mattmann is a Software Engineer at NASA’s JPL. He’s the VP of OODT in the Apache Software Foundation and an adjunct professor at USC.
OODT is a framework for managing data from multiple sources and adding them to other data sources for different purposes (like a database and a search engine.) It manages hundreds of thousands of job in a day and terabytes or petabytes of data from various sources.
Today I am joined by Karl Wright, Nokia engineer, ManifoldCF developer and author of ManifoldCF in action. We discuss ManifoldCF, an Apache Incubator project, its beginnings, its purpose and its inner workings.
AppDynamics is a company that provides a monitoring solution for .NET and Java platforms. I spoke with the VP of Engineering and one of the developers of the AppDynamics platform to dig into how they instrument your Java or .NET code and some of the tricks for following transactions from beginning to end.
There were a lot of neat tricks in this podcast episode
In order to get someone a timeline in JotRod, we need followers and following lists to compile the Jots from. This means that we need to add a new ColumnFamily called Followers and another one called Following. We don’t have the joins capability from relational databases to do this for us.
I’m going to hijack the User model’s database connection to create the ColumnFamilies. (We don’t have migrations, yet.) Here’s what I ran in the rails console: