Summary of "Building reliable systems with Apache BookKeeper"

Hi devs !!!

Here we are with this summary about the presentation of Apache BookKeeper by Matthieu Morel and Ivan Kelly on June 19th .

In this presentation we saw the main reason to use BookKeeper : reliable distributed logging. As a subproject of ZooKeeper its purpose is to give reliability to distributed log systems ( specially for Databases ).

Its architecture is based in bookies ( servers ) , ledgers ( log streams ) and ledgers entries ( log unit ).

When its needed to store logs we need to have consistency and reliability avoiding problems when the node is down , or the network is down, and also to provide an "assurance" to all the readers and writers for their operations are successfully executed and replicated . BookKeeper achieves high availability and strong durability guarantees by replicating ledger entries across multiple bookies. 

It uses ZooKeeper underneath for the consistence mechanisms between the ledgers, providing strategies to use other bookies when one is down.

Here you can have the video and the slides for the presentation.

Check the slides in SlideShare 

Enjoy :-)

NoSQL matters 2014 - We are community partners!

Hi JUGgers!

Some of you may remember that last year we were a community partner at the NoSQL matters conference. We have the pleasure to announce that this year we are again a official community partner and because of that, we have a 20% discount code available to all members of the community! Check your inbox! ;-)

NoSQL matters would like to welcome you to the 3rd annual conference in Barcelona! On 21st and 22nd November beautiful Casa Convalescència will open the doors for the adventure-hungry participants. Come around and have a great time!

Consisting of interactive training day and informative one day conference, NoSQL matters Barcelona is the event for developers, architects and geeks. You will have an opportunity to network with the leading NoSQL experts from all over the world, enjoy mind blowing talks or simply have loads of fun hacking away with other participants. NoSQL matters covers a large amount of topics with different difficulty levels and various scenarios. People from all over the world will attend, therefore the event is in English.

During the conference you will be able to excessively upgrade your knowledge on current industry trends and latest applications. You will get to know leading NoSQL companies and find out what they are up to. You will have loads of fun networking and establishing valuable contacts with other like-minded guys from the NoSQL field.

First speakers and training sessions are already announced. Take a glimpse at the great line up and training agenda.

Sounds interesting? Save your seat and get your tickets for NoSQL matters Barcelona! And do not forget to check your inbox to see the discount code!

See you there!

Productividad con Java 8 y Groovy (29/09)

Muy buenas!

Os invitamos este próximo lunes 29 a una charla de lo más especial y que organizaremos a partir de las 19h en la Sala de Actos (Edif B6) de la Facultad de Informática de Barcelona (FIB): Productividad con Java 8 y Groovy. 

Java 8 esta aquí desde hace unos meses, y como algunos ya sabéis, en esta release se han incorporado mejoras muy importantes que van desde cambios al lenguaje y a las bibliotecas estándar así como nuevas APIs. 

Las mejoras al lenguaje permiten nuevos diseños de APIs, ya que ahora es posible hacer tareas más sencillas que antes eran más complicadas. No debemos olvidar que no sólo se trata de añadir "azúcar sintáctica", los diseñadores del lenguaje se han preocupado también en hacer óptimo el bytecode, aprovechando el mecanismo de invoke dynamic que se introdujo en Java 7. 

Por otro lado Groovy es un lenguaje con mas de 10 años de desarrollo que se ha preocupado por implementar mucha azúcar sintáctica para mejorar la productividad de los desarrolladores, con la llegada de Java 8, Groovy afronta un buen reto debido a la evolución de Java como lenguaje. 

Aprovechando que Domingo Suarez Torres, JVM developer de la Ciudad de México y fundador de SpringHispano.org y Grails.org.mx, está de visita por la ciudad condal, le hemos "pinchado" para que nos charle sobre las Groovy y Java 8... y no se ha negado ;-) Así pues, Domingo nos hablará sobre las mejoras introducidas en Java 8 y como éstas pueden mejorar la productividad de los desarrolladores sin dejar de lado el rendimiento con el código escrito. Nos hará un repaso de Expresiones Lambda, API de Streamming, Method References y Default methods entre otras y también cómo estas funcionalidades pueden ser aprovechadas en Groovy. 

Sentimos anunciar este evento con poca antelación, pero hemos tenido que improvisar lo más rápido que hemos podido para poder ofrecer esta charla por parte de Domingo, antes de que se vuelva a su querido México. 

Ah! También tenemos que agradecer a Fib Alumni por su soporte, ya que realizaremos este evento en gran parte gracias a su colaboración. 

Recuerda de reservar tu plaza en MeetUp, y nos vemos a partir de las 19h en la FIB!

End of season 2013 - Feedback wanted!

Hi JUGgers!

As some of you may know, we are always trying to improve ourselves, always in order to organize better and interesting events for all of you, who make this community grow as you would like.

In this sense, we need to ask your help, because we need your point of view about what we can do, in what are you more interested or what you don't like to see it in our/your Java community.

This is the reason why we want to ask you just only 2 minutes of your time to fill a form we have created to know your opinion, dislikes and whatever you will like to share with us, mainly to improve for the future.

Here you can find the form: Barcelona JUG Feedback - season 2013

Thanks in advance for your time to help us growing in the right direction!

OSGi made easy with enRoute

Hi devs !!!!   

We hope you enjoyed our past OSGi event, and now we come back :)

Next 26th of September in Mobile World Center we will be hosting an event, at 19.00  for 2 hours, about OSGi and enRoute, and the next day, the 27th of September ,at 10.15 for 4 hours, we will host a workshop in La Fontana.

In this presentation we will remember the basic questions about OSGi and will be presented enRoute , a framework to help and ease the process of OSGi adoption. In the workshop we will play with this framework to create an application.

"In the enRoute project we are creating a tool chain that supports real modualr software engineering while making it much easier to get started. Though some development is unfortunately necessary (at least initially), the majority of what we do in this project is selecting parties that want to collaborate in this chain and making sure that users have one place where they can start working with the tool chain. This means working with partners so that the parts of the chain work together, providing documentation that describes the voids between the different tools, making tutorials that show how the chain works, initiating OSGi specifications for missing aspects, and sometimes creating open source code for crucial pieces that nobody yet has made. And last, but absolutely not least, we want to collect and describe best practices."

Prerequisites for the workshop

• Java 8, probably already got it? If not, this is a good time to get started!
• git, unlikely that you do not have it installed yet?
• Eclipse Luna, if you do not know which variant, pick the Eclipse Standard variant, make sure it has Git support.
• Bndtools, while we’re under construction you have to install it from cloudbees update site, this is the latest build and not release so do not use it for production.

Peter Kriens is an independent consultant since 1990. 

He currently works for the OSGi Alliance and jpm4j. 

During the eighties he developed advanced distributed systems for newspapers based on microcomputers based on, at the time very novel, object oriented technologies. For this experience in Objects he was hired by a number of international companies, including Adobe, Intel, Ericsson, IBM, and many others. 

During his work at Ericsson Research in 1998 he got involved with the OSGi specification; Later he became the primary editor for these specifications. In 2005 he was awarded the OSGi Fellows title. After taking a sabbatical in 2012 to develop jpm4j he returned to the OSGi Alliance to help increasing adoption. 

enRoute

Dont miss this great event !!! 

Register for Friday presentation at Mobile World Centre

Register for Saturday workshop at La Fontana

What is OSGi and why and how I should consider it for my projects

Hi devs !!!!    here we are again :)

We hope you enjoyed your vacations and that your expectations were fulfilled . ;)

To start the new season we have a great presentation with a workshop.

Next 12th of September in Mobile World Center we will be hosting a day event about OSGi, and the next day, the 13th of September we will host a workshop in La Fontana.

In this presentation we will answer to the question "What is OSGi and why and how I should consider it for my projects?" , getting information on OSGi specifications and working with one container : Apache Karaf.

Apache Karaf is now one of the most popular OSGi containers. It provide a very lightweight, powerful and enterprise ready container, allowing you to easily and quickly deploy your applications, especially the OSGi ones.

During the first session, you will have a complete overview of Karaf, and its features. You will see the shell console in action, the provisioning mechanism using Karaf Features, the security layer providing RBAC support, etc.

During the second session, the workshop, we will create a complete enterprise level OSGi application by leveraging the different layers provided by Karaf.

The presentation will be given by Jean-Baptiste Onofré. He is an ASF member and committer of Apache Karaf, Apache ServiceMix, Apache ACE, Apache Camel, Apache Archiva, Apache Kalumet, Apache Falcon, Apache Syncope and mentor on Apache Sirona.

Jean-Baptiste brings over ten years of development experience to Talend, where he works as a SOA/Software Architect. Also is the author of book "Learning Apache Cellar" .

To properly participate in the workshop would be great if you have downloaded , and installed, these libraries and software :

• IDE of your choice
• Apache Karaf 3.0.1  ( http://karaf.apache.org/index/community/download.html )
• JDK 1.7 or higher     ( http://www.oracle.com/technetwork/es/java/javase/downloads/jdk7-downloads-1880260.html  )

Don't miss this event !!!!!!!!!!!! See you there :)

Register to the Presentation - at Mobile World Centre  

Register to the Workshop ( limited seats ) - at La Fontana

OSGi Month ( 09 / 2014 )

Hi devs !!!!!!!!!

Talk in English

We're back again !!! you doubted it ? ;)

We are so proud to announce this September would be the OSGi month in BarcelonaJUG, hosting 2 presentations with 2 great speakers.

OSGi ( how to start )

Developers have been using OSGi from years ago ( e.g. Eclipse from 2005, version 3.0  using Equinox , Netbeans from 2010, version 6.9 ) and some of them know a little of this technology. Some misunderstandings have been in the road but now it's time to clarify some aspects of this technology. 

"The OSGi (Open Service Gateway initiative) specification describes modular system and a service platform for the Java programming language that implements a complete and dynamic component model, something that does not exist in standalone Java/VM environments." 
( wikipedia )

We will talk about the basic concepts of this technology, clearifying misunderstandings, tools and frameworks to an easy adoption, containers, and products to distributed architectures.

The two presentations will be a two day sessions, with a theorical presentation Friday afternoon and a workshop Saturdary morning.

These are our speakers :

Jean­Baptiste Onofré is an ASF member and committer of Apache Karaf, Apache ServiceMix, Apache ACE, Apache Camel, Apache Archiva, Apache Kalumet, Apache Falcon, Apache Syncope and mentor on Apache Sirona.

Jean­Baptiste brings over ten years of development experience to Talend, where he works as a SOA/Software Architect. Also is the author of book "Learning Apache Cellar" .

He will be presenting, 12th and 13th of September, OSGi basics and showing Apache Karaf as an OSGi container.

Peter Kriens currently works for the OSGi Alliance and jpm4j. In 2005 he was awarded the OSGi Fellows title. After taking a sabbatical in 2012 to develop jpm4j he returned to the OSGi Alliance to help increasing adoption. 

He will be presenting, 26th and 27th of September, the core of OSGi and enRoute , a framework to make as easy as possible for developers to get started with OSGi without compromising its core values.

enRoute

Hope you will enjoy this presentations. 

We will be announcing soon each session with a detailed abstract... don't miss this opportunity and reserve your seat whenever we publish the Meetup event.

Prepare your agenda and see you soon :)