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HDFS and MapReduce

by Rohit Menon | July 2014 |

In this article, written by Rohit Menon, the author of the book Cloudera Administration Handbook, we will dive deeper into the two major components of Apache Hadoop—HDFS and MapReduce, and will cover the following topics:

  • Essentials of Hadoop Distributed File System

  • The read/write operational flow in HDFS

  • Exploring HDFS commands

  • Getting acquainted with MapReduce

Read HDFS and MapReduce in full

Keeping the Site Secure

by Eric Tiggeler | July 2014 | Beginner's Guides Open Source

This article by Eric Tiggeler, the author of Joomla! 3 Beginner's Guide Second Edition, will explore some simple, logical steps you can take to safeguard your site from hackers or data loss.

You've created a great site, customized its design, and added valuable content. That's an investment worth protecting. Rest assured, most Joomla sites will run for years without any hiccups. However, it's a good idea to take some precautions to minimize the risk of your website getting broken into. A few simple measures can make it a lot harder for malicious hackers to get access to your site and mess up its contents. Backing up data regularly can get you out of trouble fast if you run into hardware disasters (such as crashing hard drives) or software trouble (such as installing extensions that somehow mess up your existing site). Fortunately, these problems are rare, but it's definitely worth the little extra time investment needed to minimize risks.

How can you protect your site and how do you get your site up and running again when something has gone wrong? This article contains some essential tips and best practices to keep your site in perfect health (and save yourself some headaches too).

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Securing the WAL Stream

by Shaun M. Thomas | July 2014 | Cookbooks Open Source

This article is written by Shaun M. Thomas, the author of PostgreSQL 9 High Availability Cookbook. This article gives you a brief idea about securing the WAL stream.

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Progressive Mockito

by Sujoy Acharya | July 2014 | Open Source

In this article by Sujoy Acharya, the author of the Mastering Unit Testing Using Mockito and JUnit, book will explore the Mockito APIs, with advanced Mockito examples and the concept of behavior-driven development with Mockito. This article distills the Mockito framework to its main core and provides technical examples.

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A Virtual Machine for a Virtual World

by Wasim Ahmed | July 2014 | Networking & Telephony Open Source

This article by Wasim Ahmed, the author of the book Mastering Proxmox, covers advanced virtual machine configurations such as enabling sound, USB devices, and so on.

In this article, we are going to look at the following topics:

  • Advanced configuration options for virtual machines
  • Nested virtual environment
  • Proxmox backup/restore system
  • Virtual machine snapshots
  • Command-line backup
Read A Virtual Machine for a Virtual World in full

Module, Facts, Types and Reporting tools in Puppet

by Thomas Uphill | July 2014 | Open Source

In this article by Thomas Uphill author of Mastering puppet we deal with different aspects of Puppet and also what all changes can be made in it.

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Introduction to Mobile Forensics

by Heather Mahalik Rohit Tamma Satish Bommisetty | July 2014 | Open Source

In this article by Satish Bommisetty, Rohit Tamma, and Heather Mahalik, the authors of the book "Practical Mobile Forensics" have introduced you to the concept of mobile forensics, core values, and its limitations. The article also provides an overview of practical approaches and best practices involved in performing mobile forensics.

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An Introduction to Microsoft Remote Desktop Services and VDI

by Andrew Fryer | July 2014 | Enterprise Articles

This article written by Andrew Fryer, the author of the book Getting Started with Windows VDI, introduces the architecture and roles in a Microsoft VDI deployment. It shows how Hyper-V is the foundation of Microsoft's VDI architecture.

Read An Introduction to Microsoft Remote Desktop Services and VDI in full

Baking Bits with Yocto Project

by Daiane Angolini Otavio Salvador | July 2014 | Open Source

In this article by Otavio Salvador and Daiane Angolini, authors of the book Embedded Linux Development with Yocto Project, we learn about the BitBake tool and the concept of metadata.

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Validating user input in workflow transitions

by Patrick Li | July 2014 |

In this article by Patrick Li, author of JIRA 6.x Administration Cookbook, we will cover one of the most powerful features in JIRA, with recipes that show you how to work with workflows, including permissions and user input validation.

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Creating the maze and animating the cube

by Jos Dirksen | July 2014 | Open Source Web Development

This article by Jos Dirksen, the author of Three.js Essentials, describes how to create a maze and animate a cube using Three.js.

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HTML5 Game Development – A Ball-shooting Machine with Physics Engine

by Makzan | July 2014 | Games

In this article by Makzan, author of the book HTML5 Game Development Hotshot, we will create a ball-shooting game with some obstacles in the playing court. We will vector graphics from Adobe Flash and attach the graphics to the physical objects.

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Various subsystem configurations

by Anders Welén Arnold Johansson | June 2014 | Open Source

This article by Arnold Johansson and Anders Welen, the authors of WildFly Performance Tuning, talks about the various subsystem configurations available for WildFly.

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Introduction to MapReduce

by Antonios Chalkiopoulos | June 2014 | Open Source

In this article, by Antonios Chalkiopoulos, the author of Programming MapReduce with Scalding, we will take a look at the core technologies used in the distributed model of Hadoop; more specifically, we will cover the Hadoop platform and the framework it provides, the MapReduce programming model, and technologies built on top of MapReduce that provide an abstraction layer and an API that is easier to understand and work with.

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Exact Inference Using Graphical Models

by Kiran R Karkera | June 2014 | Open Source

In this article by Kiran R Karkera, the author of Building Probabilistic Graphical Models with Python, we shall employ over fully specified graphical models to various inference engines to obtain answers to the questions.

Before we start on the inference trail, we shall learn about the complexity of the inference problem. Using different types of inference is appropriate in certain contexts, and we will learn which type is applicable where, and then experiment with both approaches.

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