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Archive for October, 2014

Microservices architectures – Thoughts from a SOA perspective

October 31, 2014 Leave a comment

The Cattle Crew Blog

Thoughts by: Sven Bernhardt, Richard Attemeyer, Torsten Winterberg, Stefan Kühnlein, Stefan Scheidt


A frequently discussed topic these days is the Micorservices architectural paradigm. Discussions on various internet blogs and forums are showing the trend that proponents of this approach are not tired of emphasizing why Microservices are different to a holistic SOA approach, when dealing with breaking up or avoiding monolithic software architectures.

For this reason it’s time for the Cattle Crew team, to take a closer look on this arising architectural style and the corresponding discussions from a different perspective.

Microservices Architectures

Amongst others Martin Fowler published a blog about what is characteristic for Microservices and applications build on the foundation of this architectural style [1].  According to this and other blog posts (see also [2], [3]), the goal of a Microservices approach is to avoid software systems to become monolithic, inflexible and hardly manageable…

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Microservices: Not a first principle, but an emerging design

October 31, 2014 Leave a comment

The Cattle Crew Blog

Thoughts by: Sven Bernhardt, Richard Attemeyer, Torsten Winterberg, Stefan Kühnlein, Stefan Scheidt


Up to now (see our article on Microservices from a SOA perspective) we considered Microservices as an architectural pattern: We discussed the statical structure of your system and the consequences. It seems nowadays that you design explicitely for a microservices architecture. We believe that this is the wrong way to approach the problem.
Don’t build the system with the microservices pattern in mind, but ask more important questions about how you want to develop, what are the principles to follow when building a new system… and a microservices architecture emerges naturally.

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Pivotal Hadoop Distribution and HAWQ realtime query engine

October 31, 2014 Leave a comment

BigHadoop

Introduction

SQL on Hadoop and the support for interactive, ad-hoc queries in Hadoop is in increasing demand and all the vendors are providing their answer to these requirements. In the open source world Cloudera’s Impala, Apache Drill (backed by MapR), Hortonworks’s Stinger initiatives are competing in this market, just to mention a few key players. There are also strong offerings from BI and analytics vendors such as Pivotal (HAWQ), Teradata (SQL-H) or IBM (BigSQL).
In this post we will cover Pivotal Hadoop Distribution (Pivotal HD) and HAWQ, Pivotal’s interactive distributed SQL query engine.

Getting started with Pivotal HD

Pivotal HD contains the most well-known open source components such as HDFS, MapReduce, YARN, Hive, Pig, HBase, Flume, Sqoop and Mahout. There are also additional components available such as the Command Center, Unified Storage Services, Data Loader, Spring and HAWQ as an add-on. (Pivotal has an offering called GemFire XD which is…

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Building microservices with Spring Boot – part 1

October 24, 2014 Leave a comment

plain old objects

This article introduces the concept of a microservice architecture and the motivations for using this architectural approach. It then shows how Spring Boot, a relatively new project in the Spring ecosystem can be used to significantly simplify the development and deployment of a microservice. You can find the example code on github.

What are microservices?

Since the earliest days of Enterprise Java, the most common way of deploying an application has been to package all the application’s server-side components as a single war or ear file. This so-called monolithic architecture has a number of benefits. Monolithic applications are simple to develop since IDEs and other tools are oriented around developing a single application. They are also simple to deploy since you just have to deploy the one war/ear file on the appropriate container.

However, the monolithic approach becomes unwieldy for complex applications. A large monolithic application can be difficult…

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Spring boot MVC application tutorial

October 24, 2014 Leave a comment

Looks OK!

spring-logoI will tutor you to create simple Spring MVC application based on Spring boot. App will have two linked web pages with thymeleaf. The project itself will be made in Eclipse as an Gradle project. Let’s start!

Download Source Code

Source for this tutorial is available here, on GitHub

Create project with Gradle build file

Create build.gradle file. First of all depict repositories and dependencies that you will use for gradle plugins:

buildscript {
    repositories {
        maven { url "http://repo.spring.io/libs-release"}mavenLocal()mavenCentral()}
    dependencies {classpath("org.springframework.boot:spring-boot-gradle-plugin:1.1.1.RELEASE")}}

Then apply plugins for java, spring-boot and eclipse to have default targets of these plugins:

apply plugin:'java'
apply plugin:'eclipse'
apply plugin:'spring-boot'

Now show which java version compliance you want to have, and how your jar file will be named:

sourceCompatibility =1.6

jar {
    baseName ='looksok-mvc-demo'
    version 

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I just created a Cassandra cluster that spans 3 different network domains, by using 2 simple shell commands. How cool is that?

October 24, 2014 Leave a comment
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Micro-Services and Page Composition Problem

October 20, 2014 Leave a comment

Dejan Glozic

800px-20121027_0811_Sintra_06

Dispite many desirable properties, micro-services carry two serious penalties to be contended with: authentication (which we covered in the previous post) and Web page composition, which I intend to address now.

Imagine you are writing a Node.js app and use Dust.js for the V of the MVC, as we are doing. Imagine also that several pages have shared content you want to inject. It is really easy to do using partials, and practically every templating library has a variation of that (and not just for Node.js).

However, if you build a micro-service system and your logical site is spread out between several micro-services, you have a complicated problem on your hands. Now partial inclusion needs to happen across the network, and another service needs to serve the shared content. Welcome to the wonderful world of distributed composition.

This topic came into sharp focus during Nodeconf.eu 2014. Clifton…

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