Home » Author Archives: Tugdual Grall (page 2)

Author Archives: Tugdual Grall

Tugdual Grall, an open source advocate and a passionate developer, is a Chief Technical Evangelist EMEA at MapR. He currently works with the European developer communities to ease MapR, Hadoop, and NoSQL adoption. Before joining MapR, Tug was Technical Evangelist at MongoDB and Couchbase. Tug has also worked as CTO at eXo Platform and JavaEE product manager, and software engineer at Oracle. Tugdual is Co-Founder of the Nantes JUG (Java User Group) that holds since 2008 monthly meeting about Java ecosystem. Tugdual also writes a blog available at http://tgrall.github.io/

Moving My Beers From Couchbase to MongoDB

Few days ago I have posted a joke on Twitter:                       Moving my Java from Couchbase to MongoDB pic.twitter.com/Wnn3pXfMGi — Tugdual Grall (@tgrall) January 26, 2015 So I decided to move it from a simple picture to a real project. Let’s look at the two phases of this so called ...

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How to create a pub/sub application with MongoDB ? Introduction

In this article we will see how to create a pub/sub application (messaging, chat, notification), and this fully based on MongoDB (without any message broker like RabbitMQ, JMS, … ). So, what needs to be done to achieve such thing: an application “publish” a message. In our case, we simply save a document into MongoDB another application, or thread, subscribe ...

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Big Data… Is Hadoop the good way to start?

In the past 2 years, I have met many developers, architects that are working on “big data” projects. This sounds amazing, but quite often the truth is not that amazing. TL;TR You believe that you have a big data project?           Do not start with the installation of an Hadoop Cluster — the “how“ Start to ...

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Introduction to MongoDB Geospatial feature

This post is a quick and simple introduction to Geospatial feature of MongoDB 2.6 using simple dataset and queries. Storing Geospatial Informations As you know you can store any type of data, but if you want to query them you need to use some coordinates, and create index on them. MongoDB supports three types of indexes for GeoSpatial queries:   ...

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db.person.find( { “role” : “DBA” } )

Wow! it has been a while since I posted something on my blog post. I have been very busy, moving to MongoDB, learning, learning, learning…finally I can breath a little and answer some questions. Last week I have been helping my colleague Norberto to deliver a MongoDB Essentials Training in Paris. This was a very nice experience, and I am ...

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Pagination with Couchbase

If you have to deal with a large number of documents when doing queries against a Couchbase cluster it is important to use pagination to get rows by page. You can find some information in the documentation in the chapter “Pagination“, but I want to go in more details and sample code in this article. For this example I will ...

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How to implement Document Versioning with Couchbase

Introduction Developers are often asking me how to “version” documents with Couchbase 2.0. The short answer is: the clients and server do not expose such feature, but it is quite easy to implement. In this article I will use a basic approach, and you will be able to extend it depending of your business requirements. Design The first thing to ...

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Deploy your Node/Couchbase application to the cloud with Clever Cloud

Introduction Clever Cloud is the first PaaS to provide Couchbase as a service allowing developers to run applications in a fully managed environment. This article shows how to deploy an existing application to Clever Cloud. I am using a very simple Node application that I have documented in a previous article: “Easy application development with Couchbase, Angular and Node”. Clever Cloud ...

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SQL to NoSQL : Copy your data from MySQL to Couchbase

Introduction During my last interactions with the Couchbase community, I had the question how can I easily import my data from my current database into Couchbase. And my answer was always the same: Take an ETL such as Talend to do it Just write a small program to copy the data from your RDBMS to Couchbase… So I have written ...

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