Herbert Mühlburger's Weblog

Recently I was searching for good ressources explaining the k-means clustering algorithm. I found the following video from Google Research on YouTube. It explains the K-Means clustering algorithm quite well.

Related articles

• The Difference between Segmentation and Clustering (zyxo.wordpress.com)
• Clustergram: visualization and diagnostics for cluster analysis (R code) (r-statistics.com)
• Clustering large datasets (metalev.org)

This weekend i will receive an update to Android 2.2 (Froyo) for my HTC Desire. I am really looking forward to this update.

Here is the official video of Google introducing Android 2.2 (Froyo):

Today was the kick-off  meeting of NOSQL Summer here in Graz, Austria.

A NOSQL Summer is a network of local reading groups, that will decipher & discuss NOSQL-related articles, from late June to early September 2010. Each group sets its own meeting pace (usually once a week or once every two weeks) and select which papers are up for discussion.

At every cycle, members read the selected paper at home and then meet up for an hour or so to discuss, debate and answer their own questions.

The paper then gets annotated and is published again on the NOSQL Summer website.

Four of our in the meantime already 12 local swimmers decided to join the first meeting and dived into interesting topics regarding NOSQL and distributed computing with fellow geeks. We were reading and discussing the article called “On Designing and Deploying Internet-Scale Services” (PDF) written by James Hamilton. Our discussion was first driven this article but soon also covered other topics:

• Cloud computing and setups
• Privacy issues regarding cloud storage
• Social networks and privacy concerns
• Complexity in hardware setups regarding cloud services
• Hadoop and HBASE
• Philosophical discussions on how current and past society deals with privacy specially in cloud contexts

There were a lot of different opinions and views on using internet-services and the cloud for storing and processing one’s own data. Do you prefer to keep your data in a cloud or do you prefer to host all of your data by your own? We did not find one common answer to these questions and I guess you either won’t find one. It was an interesting meeting with friends and I am already looking forward to the next one.

The next NOSQL Summer Meeting will be announced through the NOSQL Summer Website but I can already give you the date. It will take place on the 4th of August 2010, hosted at the campus of Graz University of Technology again.

If you are interested in NOSQL or distributed computing and distributed storage then just subscribe to the NOSQL Summer Group of Graz and we will keep you informed on the next paper to read and on the next interesting dates.

Articles you may find interesting too

• Paper: On Designing and Deploying Internet-Scale Services (highscalability.com)
• Cassandra: Predicting the Future of NoSQL (readwriteweb.com)
• Structure 2010: The Future of SQL in the Cloud (gigaom.com)
• Weekly Wrap-up: Old Spice Videos, TED Talks for Startups, the New Digg, And More… (readwriteweb.com)
• NoSQL, Heroku, and You (heroku.com)
• Disruptive Cloud Computing Startups At Under The Radar – NoSQL – Aspirin, Vicodin, and Vitamin (cloudave.com)
• NoSQL Database CouchDB Turns 1.0 (readwriteweb.com)

I have just found this very interesting video dealing with the implementation of HBase and Pig in combination with Hadoop at Twitter:

Related articles by Zemanta

• HBase Digest, March 2010 (sematext.com)
• Cassandra+Hadoop (slideshare.net)
• Hadoop, Hbase and Hive- Bay area Hadoop User Group (slideshare.net)

Grabeeter (@grabeeter) has just been launched and I think it is a very useful tool.

Grabeeter enables you to grab your tweets which means that you are able to store your tweets on your local harddrive in a structured format (xml at the time). Using the Grabeeter Client you are also able to perform searches on your local stored tweets.

This solves in parts the following problem. Maybe some of you have already noticed that if you have written more than 3200 Tweets you are not able to access your first tweets anymore due to Twitter access restrictions.

If you register on Grabeeter before you have reached the 3200 Tweets on Twitter you are able to access all your written tweets in the future. Grabeeter archives your tweets and enables you to export them in a structured format (XML and JSON at the time). You can also use Grabeeter Client to directly access your interesting tweets on Twitter again.

Just go to Grabeeter and register with your twitter username. All the other work is done for you. You can afterwards export and search your tweets online or using Grabeeter Client offline.

For all developers we also provide a small Grabeeter API in order to access your tweets using an application you developed.

Have fun and we are happy to get feedback from you.

Related articles

• Grabeeter – Search your tweets on your local drive (elearningblog.tugraz.at)