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Setup MongoDB Replica Set in 4 steps

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Introduction Before going into details of configuring MongoDB replica sets, let me give brief details about same: Replica Set is the feature provided by the Mongodb database to achieve high availability and automatic failover. It is kinda traditional master-slave configuration but have capability of automatic failover. It is basically group/cluster of the mongod instances which communicates, replicates to each other ...

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On the Spot Servicing with Hybrid Cloud Monitoring Solutions

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Many businesses utilize cloud host management systems for their cloud services; however, with cloud monitoring solutions, the IT manager is able to monitor a hybrid cloud infrastructure and provision the necessary hardware on-the-fly. Stated differently, cloud monitoring solutions provide the business with internal tools to monitor both the internal private cloud and the external public cloud. Configurations and Management of ...

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RESTful Webservices with Jersey

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I have discussed my earlier article about architectural consideration<<link>> to become a RESTful system on distributed environment that are usable my system/machines. This article we are going to discuss how to build web services based on REST architecture consideration. This tutorial explains how to develop RESTful web services in Java with the Tomcat 6, Eclipse and Jersey a JAX-RS (JSR ...

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Selenium Test Automation with Maven

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Today i want to help you manage your Automated GUI Tests (Selenium) better. In the past i have seen many different ways people handle this. Some people just write those plain HTML TestCases with Selenium-IDE, store it somewhere on the HDD and run manually when needed. Others dont even use Selenium-IDE. They write pure Java for Example, and automate their ...

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Developing RESTful Services using Apache CXF

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Introduction As you already know there are two ways of developing a web service Simple Object Access Protocol (SOAP) Representational State Transfer (REST) Before jumping on how to create a REST based web service using Apache CXF we shall see what is REST. REST is not a technology and certainly is not a standard of some kind. It is merely ...

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Lock Less Java Object Pool

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It has been a while since I wrote anything, I have been busy with my new job that involves doing some interesting work on performance tuning. One of the challenges is to reduce object creation during the critical part of the application. Garbage Collection hiccups has been a main pain point in java for some time, although java has improved over time the ...

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Lambdas: coming to a Java 8 near you!

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What are Lambdas? A lambda expression is a type of anonymous function, that can be written inline within a method and used wherever expressions are used. Sometimes you might find them referred to as closures, though there are some caveats to that reference that I explain below. Like a normal Java method it has parameters and a body that can ...

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MapReduce Algorithms – Understanding Data Joins Part 1

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In this post we continue with our series of implementing the algorithms found in the Data-Intensive Text Processing with MapReduce book, this time discussing data joins. While we are going to discuss the techniques for joining data in Hadoop and provide sample code, in most cases you probably won’t be writing code to perform joins yourself. Instead, joining data is ...

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Printing Generated Assembly Code From The Hotspot JIT Compiler

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Sometimes when profiling a Java application it is necessary to understand the assembly code generated by the Hotspot JIT compiler. This can be useful in determining what optimisation decisions have been made and how our code changes can affect the generated assembly code. It is also useful at times knowing what instructions are emitted when debugging a concurrent algorithm to ...

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