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What is Big Data – Theory to Implementation

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What is Big Data? You may ask; and more importantly why it is the latest trend in nearly every business domain? Is it just a hype or its here to stay? As a matter of fact “Big Data” is a pretty straightforward term – its just what its says – a very large data-set. How large? The exact answer is ...

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No downtime deploy with capistrano, Thin and nginx

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As I mentioned a couple of weeks ago I’ve been working on a tutorial about thinking through problems in graphs and since it’s a Sinatra application I thought thin would be a decent choice for web server. In my initial setup I had the following nginx config file which was used to proxy requests on to thin:       ...

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Fault Injection with Byteman and JUnit

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The time when our applications lived in isolation have passed long-long ago. Nowadays applications are a very complicated beasts talking to each other using myriads of APIs and protocols, storing data in traditional or NoSQL databases, sending messages and events over the wire … How often did you think about what will happen if, for example, a database goes down ...

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Install local jar with Maven

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1. The Problem and the options Maven is a very versatile tool and its available public repositories are second to none. However there will always be an artifact that is either not hosted anywhere, or the repository where it is hosted is risky to depend on, as it may not be up when you need it. When that happens, there ...

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ARM Virtualization – I/O Virtualization (Part 3)

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In the second part of the series we introduced memory management and interrupt handling support provided by virtualization hardware extensions. But effective virtualization solutions need to reach beyond the core to communicate with peripheral devices. In this post we discuss the various techniques used for virtualizing I/O, the problems faced, and the hardware solutions to mitigate these problems. The Difficulty ...

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Getting started with ElasticSearch

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A quick introduction to ElasticSearch, an open source, ditributed and RESTful search engine based on lucene, and how easily you can start working with it. Search Solution As mentioned in the earlier post, Choosing the right search solution for your site, feel free to analyze a best suited search solution for your requirements. In below section, we will cover further ...

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Requirements and Specifications

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As I was saying in my last blog, I’m preparing for a talk at Skills Matter entitled: “Business Analyst, Product Manager, Product Owner, Spy!” which I should just have entitled it “Requirements: Whose job are they anyway?” and so I’ve been giving a lot of thought to requirements. I finished the last blog entry noting that I was concerned the ...

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Package your classes by Feature and not by Layers

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Most of the enterprise Java applications share some similarities in their design. Mostly the packaging of these applications are driven by the framework used by them like Spring, EJBs or Hibernate etc. Alternatively you can group you packages by features. Like any other item regarding modeling this is not free from any issues. Lets discuss some trade-off and how get ...

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