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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
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