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Amazon Elastic Map Reduce to compute recommendations with Apache Mahout

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Apache Mahout is a “scalable machine learning library” which, among others, contains implementations of various single-node and distributed recommendation algorithms. In my last blog post I described how to implement an on-line recommender system processing data on a single node. What if the data is too large to fit into memory (>100M preference data points)? Then we have no choice, ...

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In Depth : Android Shutdown Sequence

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What happened when I long press power button ? What is shutdown sequence ? How is it different from desktop linux shutdown sequence? How to change shutdown menu ? Many questions pop-up in mind when we think about Android shutdown sequence. Before you read about shutdown sequence I suggest you to read about boot sequence article. Android is linux based ...

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Collaborative development: how did we get here?

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I have been doing software development for over 30 years and it has been fun to watch how the idea of collaboration has evolved. In the early 80s, in one of my first assignments as a developer I got my very own cubicle. It was in one of the far corners of a cube farm that worked really well as ...

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SQL Trick: row_number() is to SELECT what dense_rank() is to SELECT DISTINCT

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The SQL:2003 standard ranking functions are awesome companions and useful tools every now and then. The ones that are supported in almost all databases are: ROW_NUMBER(): This one generates a new row number for every row, regardless of duplicates within a partition. RANK(): This one generates a new row number for every distinct row, leaving gaps between groups of duplicates within ...

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A sneak peek at whats coming in JBoss Fuse 6.1

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I’m really excited about the forthcoming Fuse 6.1 release as there’s a ton of awesome new features which I’ve really wanted for some time and some really hawt tooling . So here’s a quick sneak peek, focussing mostly on the new version of the Fuse Management Console (which is now implemented by hawtio open source project). A-MQ First let me show ...

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Hot Deployment with IntelliJ IDEA

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Recently there was a voting in the PrimeFaces forum PrimeFaces IDE Poll for the best IDE used to develop PrimeFaces applications. The most people voted for NetBeans. NetBeans and Eclipse are free IDEs. My favorite IDE IntelliJ IDEA Ultimate is not free and I think this is a reason why there are less people using it on the job. I ...

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Amazon Free Usage Tier: Installing Tomcat 7 on an EC2 Linux instance

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Amazon Web Services offers a free usage tier for 12 months that allows developers to run anything they want in the cloud. The free tier comprises of 14 services of which the EC2 service is of most immediate interest to web developers. EC2 is a service that provides resizeable virtual computing by stopping and starting virtual instances of Windows and/or ...

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Java: Incrementally read/stream a CSV file

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I’ve been doing some work which involves reading in CSV files, for which I’ve been using OpenCSV, and my initial approach was to read through the file line by line, parse the contents and save it into a list of maps. This works when the contents of the file fit into memory but is problematic for larger files where I ...

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Tower Defense in JavaFX

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I wanted to use my Game Engine to write a Tower Defense game for a long time, but since there was an effort to create a JavaFX Tower Defense Game by another group, I thought I should rather create a different game instead. From the mailing list I learnt, that the other game is no longer being developed. So I ...

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Integrate AspectJ with NetBeans Platform Development

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Are you developing your project using the NetBeans Platform? Are you willing to use AspectJ to use AOP? You do not know how to integrate the AspectJ compiler into the builds of NetBeans? If your answer is yes, this post is for you. I decided to write this technical post because I have been struggling some time before to find ...

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