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YARN and Hadoop

In this article, by the authors, Amol Fasale and Nirmal Kumar , of the book, YARN Essentials , you will learn about what YARN is and how it's implemented with Hadoop. YARN. YARN stands for Yet Another Resource Negotiator . YARN is a generic resource platform to manage resources in a typical cluster. YARN was introduced with Hadoop 2.0, which is an open source distributed processing framework from the Apache Software Foundation. In 2012, YARN became one of the subprojects of the larger Apache Hadoop project. YARN is also coined by the name of MapReduce 2.0. This is since Apache Hadoop MapReduce has been re-architectured from the ground up to Apache Hadoop YARN. Think of YARN as a generic computing fabric to support MapReduce and other application paradigms within the same Hadoop cluster; earlier, this was limited to batch processing using MapReduce. This really changed the game to recast Apache Hadoop as a much more powerful data processing system. With the advent of YARN, Hadoop now looks very different compared to the way it was only a year ago. YARN enables multiple applications to run simultaneously on the same shared cluster and allows applications to negotiate resources based on need. Therefore, resource allocation/management is central to YARN. YARN has been thoroughly tested at Yahoo! since September 2012. It has been in production across 30,000 nodes and 325 PB of data since January 2013. Recently, Apache Hadoop YARN won the Best Paper Award at ACM Symposium on Cloud Computing ( SoCC ) in 2013!

Postgres Add-on

In this article by Patrick Espake , author of the book Learning Heroku Postgres , you will learn how to install and set up PostgreSQL and how to create an app using Postgres.

Controlling DC motors using a shield

 In this article by Richard Grimmett , author of the book Intel Galileo Essentials ,let's graduate from a simple DC motor to a wheeled platform. There are several simple, two-wheeled robotics platforms. In this example, you'll use one that is available on several online electronics stores. It is called the Magician Chassis, sourced by SparkFun. The following image shows this:

Getting Up and Running with Cassandra

As an application developer, you have almost certainly worked with databases extensively. You must have built products using relational databases like MySQL and PostgreSQL, and perhaps experimented with a document store like MongoDB or a key-value database like Redis. While each of these tools has its strengths, you will now consider whether a distributed database like Cassandra might be the best choice for the task at hand. In this article by Mat Brown , author of the book Learning Apache Cassandra , we'll talk about the major reasons to choose Cassandra from among the many database options available to you. Having established that Cassandra is a great choice, we'll go through the nuts and bolts of getting a local Cassandra installation up and running. By the end of this article, you'll know: When and why Cassandra is a good choice for your application How to install Cassandra on your development machine How to interact with Cassandra using cqlsh How to create a keyspace

Booting the System

 In this article by William Confer and William Roberts , author of the book, Exploring SE for Android , we will learn once we have an SE for Android system, we need to see how we can make use of it, and get it into a usable state. In this article, we will: Modify the log level to gain more details while debugging Follow the boot process relative to the policy loader Investigate SELinux APIs and SELinuxFS Correct issues with the maximum policy version number Apply patches to load and verify an NSA policy

RESTful Web Service Mocking and Testing with SoapUI, RAML, and a JSON Slurper Script Assertion

In this article written by Rupert Anderson , the author of SoapUI Cookbook , we will cover the following topics: Installing the SoapUI RAML plugin Generating a SoapUI REST project and mock service using the RAML plugin Testing response values using JSON Slurper As you might already know, despite being called SoapUI, the product actually has an excellent RESTful web service mock and testing functionality. Also, SoapUI is very open and extensible with a great plugin framework. This makes it relatively easy to use and develop plugins to support APIs defined by other technologies, for example RAML ( ) and Swagger ( ). If you haven't seen it before, RESTful API Modeling Language or RAML is a modern way to describe RESTful web services that use YAML and JSON standards. As a brief demonstration, this article uses the excellent SoapUI RAML plugin to: Generate a SoapUI REST service definition automatically from the RAML definition Generate a SoapUI REST mock with an example response automatically from the RAML definition Create a SoapUI TestSuite , TestCase , and TestStep to call the mock Assert that the response contains the values we expect using a Script Assertion and JSON Slurper to parse and inspect the JSON content This article assumes that you have used SoapUI before, but not RAML or the RAML plugin. If you haven't used SoapUI before, then you can still give it a shot, but it might help to first take a look at Chapters 3 and 4 of the SoapUI Cookbook or the Getting Started , REST , and REST Mocking sections at .

Introducing Web Application Development in Rails

In this article by Syed Fazle Rahman , author of the book Bootstrap for Rails ,we will learn how to present your application in the best possible way, which has been the most important factor for every web developer for ages. In this mobile-first generation, we are forced to go with the wind and make our application compatible with mobiles, tablets, PCs, and every possible display on Earth. Bootstrap is the one stop solution for all woes that developers have been facing. It creates beautiful responsive designs without any extra efforts and without any advanced CSS knowledge. It is a true boon for every developer. We will be focusing on how to beautify our Rails applications through the help of Bootstrap. We will create a basic Todo application with Rails. We will explore the folder structure of a Rails application and analyze which folders are important for templating a Rails Application. This will be helpful if you want to quickly revisit Rails concepts. We will also see how to create views, link them, and also style them. The styling in this article will be done traditionally through the application's default CSS files. Finally, we will discuss how we can speed up the designing process using Bootstrap. In short, we will cover the following topics: Why Bootstrap with Rails? Setting up a Todo Application in Rails Analyzing folder structure of a Rails application Creating views Styling views using CSS Challenges in traditionally styling a Rails Application

Christmas Light Sequencer

In this article by Sai Yamanoor and Srihari Yamanoor , authors of the book Raspberry Pi Mechatronics Projects Hotshot , have picked a Christmas-themed project to demonstrate controlling appliances connected to a local network using Raspberry Pi. We will design automation and control of Christmas lights in our homes. We will decorate our homes with lights for any festive occasion and work on a article that enables us to build fantastic projects. We will build a local server to control the devices. We will use the framework to design the web server. We'd like to dedicate this article to the memory of Aaron Swartz who was the founder of the framework.

Agile data modeling with Neo4j

The Raspberry Pi and Raspbian

 In this article by William Harrington , author of the book Leaning Raspbian , we will learn about the Raspberry Pi, the Raspberry Pi Foundation and Raspbian, the official Linux-based operating system of Raspberry Pi. In this article, we will cover: The Raspberry Pi History of the Raspberry Pi The Raspberry Pi hardware The Raspbian operating system Raspbian components

Actors and Pawns

In this article by William Sherif , author of the book Learning C++ by Creating Games with UE4 , we will really delve into UE4 code. At first, it is going to look daunting. The UE4 class framework is massive, but don't worry. The framework is massive, so your code doesn't have to be. You will find that you can get a lot done and a lot onto the screen using relatively less code. This is because the UE4 engine code is so extensive and well programmed that they have made it possible to get almost any game-related task done easily. Just call the right functions, and voila, what you want to see will appear on the screen. The entire notion of a framework is that it is designed to let you get the gameplay you want, without having to spend a lot of time in sweating out the details.

Static Data Management

 In this article by Loiane Groner , author of the book Mastering Ext JS, Second Edition , we will start implementing the application's core features, starting with static data management. What exactly is this? Every application has information that is not directly related to the core business, but this information is used by the core business logic somehow. There are two types of data in every application: static data and dynamic data. For example, the types of categories, languages, cities, and countries can exist independently of the core business and can be used by the core business information as well; this is what we call static data because it does not change very often. And there is the dynamic data, which is the information that changes in the application, what we call core business data. Clients, orders, and sales would be examples of dynamic or core business data. We can treat this static information as though they are independent MySQL tables (since we are using MySQL as the database server), and we can perform all the actions we can do on a MySQL table.

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