Teddy in Antwerp
December 12, 2010
Teddy in Antwerp # When at Devoxx Teddy went to the city taking a few pictures of the Grote Markt, the Haven as well as the main train station.
Inductive Bias
Apache Lunch Devoxx
December 11, 2010
Apache Lunch Devoxx # On Twitter I suggested to host an Apache dinner during Devoxx. Matthias Wesendorf of Apache MyFaces was so kind to take up the discussion carrying it over to the Apache community mailing-list. It quickly turned out that there was quite some interest with several members and committers attending Devoxx. We scheduled the meetup for Friday after the conference during lunch time. I pinged a few Apache related people I knew would attend the conference (being a speaker and a committer at some Apache project almost certainly resulted in getting a ping). ...
Devoxx – Day three
December 10, 2010
Devoxx – Day three # The panel discussion on the future of Java was driven by visitor submitted and voted questions on the current state and future of Java. The general take-aways for me included the clear statement that the TCK will never be made available to the ASF. The promise of Oracle to continue supporting the Java community and remaining active in the JCP. There was some discussion on whether coming Java versions should be backwards-incompatible. ...
Devoxx – Day 2 HBase
December 9, 2010
Devoxx – Day 2 HBase # Devoxx featured several interesting case studies of how HBase and Hadoop can be used to scale data analysis back ends as well as data serving front ends. Twitter Dmitry Ryaboy from Twitter explained how to scale high load and large data systems using Cassandra. Looking at the sheer amount of tweets generated each day it becomes obvious that with a system like MySQL alone this site cannot be run. ...
Devoxx – Day two – Hadoop and HBase
December 8, 2010
Devoxx – Day two – Hadoop and HBase # In his session on the current state of Hadoop Tom went into a little more detail not only on the features released in the latest release or on the roadmap for upcoming releases (including Kerberos based security, append support, warm standby namenode and others). He also gave a very interesting view on the current Hadoop ecosystem. More and more projects are currently being created that either extend Hadoop or are built on top of Hadoop. ...
Apache Mahout Meetup in San Jose
December 8, 2010
Apache Mahout Meetup in San Jose # A few hours ago the Mahout Meetup at MapR Technologies in San Jose/CA ended. Two photos taken at the event leaked - happy to be able to publish them here. More information on the discussions and more technical details to follow. Stay tuned.
Devoxx – Day two – Caching
December 7, 2010
Devoxx – Day two – Caching # Day two started with a really good talk on caching architectures by Greg Luck. He first motivated why caching works: Even with SSIDs being available now there is still a huge performance gap between RAM access times and having to go to disk. The issue is even worse in systems that are architected in a distributed way making frequent calls to remote systems. ...
Devoxx – University – Cassandra, HBase
December 6, 2010
Devoxx – University – Cassandra, HBase # During the morning session FIXME Ellison gave an introduction to the distributed NoSQL database Cassandra. Being generally based on the Dynamo paper from Amazon the key-value store distributes key/value pairs according to a consistent hashing schema. Nodes can be added dynamically making the system well suited for elastic scaling. In contrast to Dynamo, Cassandra can be tuned for the required consistency level. The system is tuned for storing moderately sized key/value pairs. ...
Devoxx University – MongoDB, Mahout
December 5, 2010
Devoxx University – MongoDB, Mahout # The second tutorial was given by Roger Bodamer on MongoDB. It concentrates on being horizontally scalable by avoiding joins and complex, multi document transactions. It supports a new data model that allows for flexible, changeable “schemas”. The exact data layout is determined by the types of operations you expect for your application, by the access patterns (reading vs. writing data; types of updates and types of queries). ...
Frau Holle, Frau Holle
December 5, 2010
Frau Holle, Frau Holle # Winter arrived in Germany - below a few pictures I took last Thursday morning: Seems like this season winter is trying real hard to prove that I am wrong saying that there is no real winter in Berlin with just about a week snow on the streets ;) Guess its time to get the tires with spikes back on my bike.