Download the slidedeck of our talk at fosdem 2013 including all the resources that we pointed to. Most important other links are:

was great talking here and again we are open source, open data and so on. So if you have suggestions or want to contribute feel free. Just do it or contact us. We are really looking forward to meet some other hackers that just want to go geek and change the world the video of the talk can be found here:

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René Pickhardt on February 2nd, 2013

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Excerpt: Peter who is working for Neo4j is an industry partner of the http://www.ldbc.eu/ which is a EU FP7 Project in the Big Data call. The goal of this project is to put out good methodologies for benchmarking linked open data and rdf stores as well as graph data bases. In this context the council should also provide data sets for benchmarking. Peter points out that a simple problem exists with benchmarks:”who ever puts it out wins” One simple reason is that benchmarking has so many flexible variables that it is really hard. he compared the challanges to the tpc http://de.wikipedia.org/wiki/Transaction_Processing_Performance_Council After talking about…

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Excerpt: Davy really nicely introduced the problem of looking at a snapshot of a data base. This problem obviously exists for any data base technology. You have a lot of timestamped records but running a query as if you fired it a couple of month ago is always a difficult challange. With FluxGraph a solution to this is introduced. How I understood him in the talk he introduces new versions of a vertex or an edge everytime it gets updated, added or removed. So far I am wondering about scaling and runtime. This approach seems like a lot of overhead to me. Later…

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René Pickhardt on February 2nd, 2013

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Excerpt: Frank Cellar (https://twitter.com/fceller) introduces his ArangoDB which is basically a Document store (key, value) and uses a blueprint graph interface. Interestingly he is doing his demonstrations on the DBLP data set which is highly relevant for Heinrich and my related work project which we are introducing in our talk. ArangoDB has several APIs to interact with it they consist of: available from JavaScript RESTful HTTP API Blueprint bindings (Gremlin support is available: nice!) After playing around with the ArangoDB and Gremlin console Frank started to Introduce AQL (=ArangoDB Query Language). ArangoDB also consists of a traverser Framework. After the talk I now know about the API’s of…

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Excerpt: As we know neo4j has a master slave replication with eventual consistency so there is not the typical ACID requirements. The way is ether wring the master which pushes to the slaves. But it is also possible to write to the slaves directly which is super save but much slower since syncronization between slaves is required. In gerneral (not very specific to neo4j there are a view concerns) Cluster management (how to handle new machines joining or leaving the cluster as well as heartbeat messages) this also holds true for failover (Master election, Distribution of Master status) Replication (synchronized id-generation, distributed locks, and…

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Excerpt: During my trip in China I was visiting Beijing on two weekends and Maceau on another weekend. These trips have been mainly motivated to meet old friends. Especially the heads behind the biggest English resource of Chinese Rock music Rock in China who are Max-Leonhard von Schaper and the founder of the biggest Chinese Rock Print Magazin Yang Yu. After looking at their wiki which is pure gold in terms of content but consists mainly of plain text I introduced them the idea of putting semantics inside the project. While consulting them a little bit and pointing them to the…

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Excerpt: As I said yesterday I have been busy over the last months producing content so here you go. For related work we are most likely to use neo4j as core data base. This makes sense since we are basically building some kind of a social network. Most queries that we need to answer while offering the service or during data mining carry a friend of a friend structure. For some of the queries we are doing counting or aggregations so I was wondering what is the most efficient way of querying against a neo4j data base. So I did a…

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Excerpt: Being strong pro on the topic of open access I always try to publish all my work on my blog but sometimes I am busy or I forget to update so today I took the time to look at all my old drafts and the stuff that hasn’t been published yet. So here is a list of new content on my blog that should have been published long ago I also linked it in the articles of interest: The slides of my Graphity talk at FOSDEM 2012 The slides of my Graphity talk at SocialCom 2012 The slides of my Oberseminar talk on…

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René Pickhardt on November 2nd, 2012

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Excerpt: So the culture is different from Western culture we all know that! I am certainly not an expert on China but after living in China for almost 2 years knowing some language and working in a chinese company seeing presentations every week and also visiting over 30 western and chinese companies placed in China I think I have some insights about how you should organize your presentation in China. Since I recently went to Shanghai in order to to research exchange with Jiaotong University I was about to give a presentation to introduce my institute and me. So here you can…

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René Pickhardt on September 24th, 2012

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Excerpt: This morning I received an email from Simon Turschner asking me to look at his new project Vensenya.http://www.indiegogo.com/vensenya I did and donated 150 Euro to the project because I think it is just great what Simon plans to do. I know Simon from a summer academie in Guidel 2008 after he received his master in Biology fighting cancer he decided to join Tech First a model very similar to Tech for America. This is a program where so called high potentials are supposed to teach children with bad social background for two years and help them to find an apprenticeship. I loved…

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