YaJUG: Cassandra

Jeudi 2 octobre 2014 de 18:00 à 20:00  –  Luxembourg City, Luxembourg

18H00 : Introduction à Cassandra – Duy Hai DOAN (DataStax)

Cassandra est la base NoSQL orientée colonnes derrière les grandes entreprises comme Netflix, Sony Entertainment, Apple …
Une première session couvre la présentation générale de Cassandra et de son architecture. La deuxième session aborde le modèle de données et les bonnes pratiques de modélisation: comment passer du monde SQL au monde NoSQL avec Cassandra.

19H10 : Outillage de la solution Cassandra – Michaël Figuière (DataStax)

Présentation des outils pour aider le développeur Java à travailler efficacement avec Cassandra.

Hack.lu 2012

Hack.lu is an open convention/conference where people can discuss about computer security, privacy,

information technology and its cultural/technical implication on society.

The aim of the convention is to make a bridge of the various actors in the computer security world.

The conference takes place:

  1. at Parc Hotel Alvisse in Luxembourg

  2. the 23-25 October 2012


Some of the invited talks and workshop are now announced(follow this link for more details)


Luxembourg Startup Weekend 2012


Luxembourg Startup Weekend 2012

Startup Weekend

Friday, 16 November 2012 at 18:00 – Sunday, 18 November 2012 at 23:00 (CET)


9, avenue des Hauts-Fourneaux; L-4362 Esch-sur-Alzette Grand Duchy of Luxembourg – www.technoport.lu


All details available at luxembourg.startupweekend.org

Ever wondered what it takes to be an entrepreneur?

The professional and personal challenges, the high and lows, the failures and the success?

Startup Weekend is a global grassroots movement of active and empowered entrepreneurs who are learning the basics of founding startups and launching successful ventures. It is the largest community of passionate entrepreneurs with over 400 past events in 100 countries around the world in 2011.

The non-profit organization is headquartered in Seattle, Washington but Startup Weekend organizers and facilitators can be found in over 200 cities around the world. From Mongolia to South Africa to London to Brazil, people around the globe are coming together for weekend long workshops to pitch ideas, form teams, and start companies.

All Startup Weekend events follow the same basic model: anyone is welcome to pitch their startup idea and receive feedback from their peers. Teams organically form around the top ideas (as determined by popular vote) and then it’s a 54 hour frenzy of business model creation, coding, designing, and market validation. The weekends culminate with presentations in front of local entrepreneurial leaders with another opportunity for critical feedback.

Whether entrepreneurs found companies, find a cofounder, meet someone new, or learn a skill far outside their usual 9-to-5, everyone is guaranteed to leave the event better prepared to navigate the chaotic but fun world of startups. If you want to put yourself in the shoes of an entrepreneur, register now for the best weekend of your life!

Berkeley "big data" class for free

You can freely get access to a  2 day class  “big data” from Berkeley

It’s online live streaming, as explained on their website: http://ampcamp.berkeley.edu/


The first UC Berkeley AMP Camp will be hosted in Berkeley (and online) -22, 2012, brought to you by the AMPLab, featuring hands-on tutorials teaching Big Data analysis using the AMPLab software stack, including SparkShark, and Mesos. These tools help accelerate Hadoop and other popular data management platforms.

The AMPLab works at the intersection of machine learning, cloud computing, and crowdsourcing; integrating Algorithms, Machines, and People (AMP) to make sense of Big Data, and we want to share our expertise with you! Attendees will learn to solve Big Data problems using components of the Berkeley Data Analytics System (BDAS) and cutting edge machine learning algorithms.

The AMP Camp curriculum includes:

  • Attendees will analyze real data on EC2 with SparkShark, and Mesos, which enable interactive queries and iterative jobs up to 30x faster than Hadoop MapReduce
  • Scalable machine learning algorithms
  • Crowdsourcing answer to questions that can’t be answered by computers alone
  • Case-studies presented by active BDAS users

Registration for in-person attendance is sold out, but we encourage you to click the button below to register for our FREE online live streaming of the event Aug 21-22. The live stream includes all talks, hands-on exercises, and walk through’s using Spark, Shark, and Mesos on real data. If you miss any live or in-person event, you can return to this site to find archives of all materials.

US Social Security was the mother of all BigData projects

Great post from IBM , celebrating this year’s Social Security’s 75th anniversary. It was exactly 75 years ago this month that IBM delivered to the U.S. government the machines that were credited with making the program possible.

During the Great Depression, President Franklin Delano Roosevelt conceived of Social Security as a program for senior citizens, the disabled, the unemployed, widows and orphans who lacked financial protection. However, when Roosevelt signed the Social Security Act into law in August, 1935, the document did not say how the details would play out.

The task of creating and managing more than 26 million individual accounts had yet to be determined. The sheer scale of this early “Big Data” project was daunting enough; press reports labeled it as the largest bookkeeping job of all time. In addition, the seemingly unrealistic timeframes – the law dictated that the program be in place by January 1, 1937 – were equally frightening. Some experts felt the task was impossible, and recommended that Roosevelt abandon it.

A 1937 Headline Announces the World’s “Biggest Bookkeeping Job”.

Click here for larger image

But the Social Security Administration stayed the course. In the summer of 1936, the agency collected proposals from various accounting equipment vendors, each suggesting their own approach to record-keeping.

IBM was ready to handle the challenge because it had a proven track record in large scale government accounting projects dating back to the 1920s. The company had the systems and process knowledge necessary to ensure that the Social Security program’s policies and procedures could be quickly developed and rapidly deployed. The depth of IBM’s proposal, as well as the government’s familiarity with IBM’s skills and equipment, convinced the Agency that the company had the most viable solution, and in September 1936, IBM was awarded the contract.

There was another factor. IBM’s CEO, Thomas Watson, Sr., continued to invest in research & development throughout the Depression. So when the Agency awarded IBM the contract and asked the company to invent a machine that would automatically and rapidly integrate payroll contributions into millions of individual accounts – something that was essential to the success of the program – IBM engineers were ready for the task. They developed the IBM 077 Collator, the machine that made Social Security a reality.

A Social Security Administration worker uses an IBM card punch to prepare cards for processing.

The invention of a new machine wasn’t the only challenge facing Social Security; the logistics of the program were equally daunting. The paper records alone took up 24,000 square feet of floor space. In fact, the weight of the paper records and IBM machines was so great that no building in Washington had floors sturdy enough to hold them, so operations were set up in an old Coca-Cola bottling plant on Baltimore’s waterfront.

The building was far from people friendly. It was cold in the winter, and hot in the summer. Plus, the summer heat brought with it the overpowering smells of rotting fish from the docks and spices from a local spice factory. The Social Security employees in the building also were plagued by sand fleas that lived in the sound-deadening sand barriers between floors.

When the IBM collators were put into action in June 1937, there was still much work to be done before the first Social Security check would be mailed to Miss Ida May Fuller in 1940. However, there were no longer doubts that the program was possible.

It was the close partnership between IBM and the Social Security Administration that created the record keeping system that made Roosevelt’s vision a reality. The partnership improved the quality of life for generations of Americans. It also catapulted IBM from a mid-sized company to the world’s leading information management provider.

But beyond the monumental size and scope of the project, the real significance of Social Security was that it proved that public-private partnerships could roll out enormous solutions to meet grand challenges, promote economic growth and help society.

Public-private partnerships aren’t easy. You need to balance different concerns and learn to work together. But when you do, these partnerships work, and they are essential for driving business and societal growth for the long term. From Social Security to IBM’s work withsmarter cities around the world, public-private partnerships demonstrate that collaboration is the key to innovation.

Jonathan Fanton, Ph.D., is the Franklin Delano Roosevelt Visiting Fellow at the Roosevelt House Public Policy Institute at Hunter College in New York City. Dr. Fanton previously served as President of the John D. and Catherine T. MacArthur Foundation, and as President of the New School for Social Research.

HaxoGreen 2012 starting next July 26th

HaxoGreen 2012 is the third iteration of the annual four-day outdoor camp in early summer 2012 organized by syn2cat. This rather informal and cosy hacker camp takes place from July 26th – 29th 2012.

The camp is organized by the community around Luxembourg’s hacker community syn2cat. We appreciate your participation, be it by holding a lecture, a workshop or presenting your projects and ideas during a 10 minutes lightning talk.

More information



The camp is located at the scouts’ ground Belvedère near the city of Dudelange in the southern region of Luxembourg/Europe. The camping ground features adequate restrooms and shower facilities. Indoor rooms for lectures and workshops are also available.

Hack.lu 2012 8th edition

Call for Papers for hack.lu 2012 is now out! – You can register and submit your paper via the CFP website.

Hack.lu is an open convention /conference where people can discuss about computer security, privacy, information technology and its cultural/technical implication on society. The aim of the convention…


The conference will take place in Luxembourg (that’s the 8th edition) the 23-25 October 2012 and everyone is welcome to submit a talk/paper to the conference on interesting security topics.



NoSQL matters 2012 in Cologne (DE)

NoSQL conference, http://www.nosql-matters.org/, will take place on 29 and 30 May 2012 in Cologne (Germany).


Featured Speakers

Salvatore Sanfilippo – The new Redis 2.6

There have been a lot of changes Redis had to go through in recent months. After one year in the lab, the new Redis 2.6 is now entering the NoSQL scene, providing a lot of new functions. So, how will Redis meet the demands of the upcoming challenges? Redis-creator Salvatore Sanfilippo will tell you.


Peter Idestam-Almquist – A different kind of database

Peter Idestam-Almquist will describe a different kind of a NewSQL database, which will process millions of ACID-compliant transactions while scaling in on a single machine to fully ensure consistency. He will also delve into the technical differentiators between traditional relational databases, NoSQL and NewSQL databases and what applications they are best-suited for.

Jan Lehnardt – The No-Marketing Bullshit Introduction to Couchbase Server 2.0

Couchbase is an Apache 2.0 licensed open source project based on memcached, Membase and CouchDB technologies aiming to storage data flexible, fast and reliable. Jan Lehnardt, Co-Founder of Couchbase, introduces the architecture, as well as features of CouchDB and demonstrates integration challenges and solutions. You’ll see how it all works under the hood.

Olaf Bachmann – The Google-Case

While the whole world seems to be thinking about NoSQL, Google now will be returning to SQL. As you can imagine, they wouldn’t do so without a purpose. And seemingly Google will not be the only company that prefers to manage its data repositories with SQL. Don’t miss the “No-NoSQL” presentation by Google’s Olaf Bachmann to find out the backgrounds.

Peter Neubauer – Fun&Pun with Graphs

With property graph databases and NoSQL coming into vogue over the last years, the interest in graph algorithms, graph processing and recommender systems has seen a lot of attention. Peter will show basic recommendation algos, spreading activation and min/max flow calculations on live demo graphs – be aware that things might break, but fun and pun is guaranteed.

Hack.lu 2012

Hack.lu 2012 will take place the 23,24 and 25 October 2012. Update your agenda.

The conference will be held as every year in Luxembourg, a small country between France, Belgium and Germany :)

Hack.lu is an open convention /conference where people can discuss about computer security, privacy, information technology and its cultural/technical implication on society.

The aim of the convention is to : make a bridge of the various actors in the computer security world.

Yajug event – JPA on NoSQL

A new great event upcoming at the JAYUGagenda next October 25th

 JPA on NoSQL: an approach with Hibernate OGM by Emmanuel Bernard

1.   The speaker

Emmanuel Bernard (http://emmanuelbernard.com/ )  co-author of Hibernate Search in Action from Manning.


2.   Abstract

PaaS, Cloud. How to store data is the real challenge. In a NoSQL store? Could we do that with familiar APIs?

The goal of Hibernate OGM is to explore how we could reuse Java Persistence (known domain model centric API) to store entities in NoSQL stores. It offers a JPA front end (object manipulation and JP-QL query) to applications while storing and querying data from a key/value grid (and other NoSQL later). That includes trying to support existing applications using JPA.

In this presentation, we will:

  • see an overview of the (No)SQL landscape and how a JPA front end can fit some interesting use cases.
  • explore how to store entities and associations into a key/value store and what compromise has to be made.
  • explore the trade-offs between schema vs schema-less, what can be translated from the relational model and what cannot
  • see how one can implement JP-QL queries on top of a non queryable technology (key/value store)

This presentation will contains live demos.


3.   When

 Next October 25th

  • 17h30 – Welcome and registration
  • 18h00 – JPA on NoSQL: an approach with Hibernate OGM
  • 20h00 – Drink and Networking


4.   Where

Centre de Recherche Public Henri Tudor
29, avenue John F. Kennedy
L – 1855 Luxembourg – Kirchberg


More details  on Yajug official website