Older blog entries for sness (starting at number 4658)

Large Scale Machine Learning and Other Animals: Mahout - SVD matrix factorization - formatting input matrix

Large Scale Machine Learning and Other Animals: Mahout - SVD matrix factorization - formatting input matrix: "Converting Input Format into Mahout's SVD Distributed Matrix Factorization Solver

Purpose
The code below, converts a matrix from csv format:
,,\n
Into Mahout's SVD solver format.
"

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Syndicated 2012-11-27 00:10:00 from sness

SSTable and Log Structured Storage: LevelDB - igvita.com

SSTable and Log Structured Storage: LevelDB - igvita.com: "If Protocol Buffers is the lingua franca of individual data record at Google, then the Sorted String Table (SSTable) is one of the most popular outputs for storing, processing, and exchanging datasets. As the name itself implies, an SSTable is a simple abstraction to efficiently store large numbers of key-value pairs while optimizing for high throughput, sequential read/write workloads."

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Syndicated 2012-11-25 01:37:00 from sness

SequenceFile (Apache Hadoop Main 2.0.2-alpha API)

SequenceFile (Apache Hadoop Main 2.0.2-alpha API): "SequenceFiles are flat files consisting of binary key/value pairs.

SequenceFile provides Writer, Reader and SequenceFile.Sorter classes for writing, reading and sorting respectively."

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Syndicated 2012-11-25 01:32:00 from sness

Hadoop Tutorial Series, Issue #1: Setting Up Your MapReduce Learning Playground | My Blog by Philippe Adjiman

Hadoop Tutorial Series, Issue #1: Setting Up Your MapReduce Learning Playground | My Blog by Philippe Adjiman: "export M2_HOME=/usr/local/apache-maven
export M2=$M2_HOME/bin
export PATH=$M2:$PATH
Then from the same terminal go into the workspace directory (usually located at ~/workspace) and create a java project hierarchy using the following maven command (change the groupId and the artifactId as you like):

"

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Syndicated 2012-11-24 23:49:00 from sness

Maven: Building a Self-Contained Hadoop Job | Matthias Friedrich's Blog

Maven: Building a Self-Contained Hadoop Job | Matthias Friedrich's Blog: "That’s it, we’re done. You can now build your job JAR:


mvn clean package
Your self-contained job JAR is the file in target ending with -job.jar. Run it using Hadoop’s jar sub-command:"

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Syndicated 2012-11-24 23:39:00 from sness

Why isn't Java used for modern web application development? - Programmers

Why isn't Java used for modern web application development? - Programmers: "Java absolutely is used for modern web application development. Particularly once you get to the slighly larger / more complex / scalable end of the web application spectrum.

If you are interested in modern, productive tools and frameworks take a look at:

The Play framework
Google Web Toolkit
Vaadin
Tapestry 5
But I think most truly modern web development on the JVM platform is likely to be done in one of the new JVM languages rather than using Java directly, with Java simply providing the backbone in terms of underlying libraries and back-end infrastructure. There is a lot of web development happening in Groovy (Grails), Scala (Lift), JRuby (JRuby on Rails) and Clojure (Noir, Ring/Enlive+lots of custom frameworks) to name but a few.

With all the innovation happening the new JVM language space, I personally suspect that Java will ultimately become the "assembler of server-side programming"."

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Syndicated 2012-11-23 20:28:00 from sness

Getting Started with Web Applications

Getting Started with Web Applications: "A web application is a dynamic extension of a web or application server. There are two types of web applications:

Presentation-oriented: A presentation-oriented web application generates interactive web pages containing various types of markup language (HTML, XML, and so on) and dynamic content in response to requests. Chapters 11 through 22 cover how to develop presentation-oriented web applications.
Service-oriented: A service-oriented web application implements the endpoint of a web service. Presentation-oriented applications are often clients of service-oriented web applications. Chapters 8 and 9 cover how to develop service-oriented web applications."

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Syndicated 2012-11-23 20:28:00 from sness

Can anyone recommend a simple Java web-app framework? - Stack Overflow

Can anyone recommend a simple Java web-app framework? - Stack Overflow: "I'm trying to get started on what I'm hoping will be a relatively quick web application in Java, yet most of the frameworks I've tried (Apache Wicket, Liftweb) require so much set-up, configuration, and trying to wrap my head around Maven while getting the whole thing to play nice with Eclipse, that I spent the whole weekend just trying to get to the point where I write my first line of code!"

'via Blog this'

Syndicated 2012-11-23 20:27:00 from sness

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