NoSQL Geek2Geek at Wikimedia

Last week we did again a Geek2Geek event in Berlin. This time the event was hosted by Wikimedia Deutschland and the topic was “NoSQL Ring Architecture”.

Ring Architecture

Ring Architecture is designed for high scalability and BIG DATA! The idea is the your data store is organized in a ring and your write operations can be send to multiple nodes in the ring. The nodes of the ring can be server nodes distributed over the whole planet.


Typically your data is stored redundantly in multiple nodes (Not necessary in all nodes). That makes it automatically very failure tolerant.

Ring Architecture is optimized for writes! There is a bunch of use cases for this kind of Architecture. For example smart meters. If you have a couple million houses with smart meters, sending every 1 minute their state to a centralized data store, you have A LOT of write load! Good luck if you try to handle that load with a multi master MySQL Cluster 😀

It is also very interesting for Geo Location use cases. If you run a service world wide for local retail for example, you will send most of your write operations from Europe to nodes in Europe. that means that read operations from Europe are super fast. Reads for European retail data from other continents would be still possible of course, but it would be a bit slower. But that’s OK, because you know that kind of reads are the Exception.


The Geek2Geek event happens every couple weeks. Always at a different location and always with a different topic. We always invite at least 2 speakers to 1 topic. We want to see different solutions for a problem and get people with different background into 1 room.

Two very popular implementations for Ring Architecture are Apache Cassandra and Riak. We had a talk to each of them. Round about 50 people attended to the event.


Check out more pictures on the MeetUp page.


The Apache Cassandra project is completely open source and it was originally started by engineers at Facebook. No wonder, they have a lot of writes and reads on their backend I guess 🙂

Christian Johannsen gave a talk to Cassandra. The talk was recorded and we even live streamed the talk on YouTube. Watch the talk here.

Christian did a great job. He gave a really good intro to Cassandra and explained very well how it works. We had surprisingly many questions to Cassandra from the audience. Much more than usual.


Riak is a younger implementation of the Ring Architecture. Guillermo Alvarez from Wooga did the 2nd talk about Riak. He gave a short intro and showed us how they use Riak at Wooga to develop some amazing games. Watch his talk here:

Guillermo did a great job as well. It was very interesting to listen to the Wooga use cases. And we had a lot of questions from audience to Riak as well. This time the audience showed a high engagement 🙂


Geek2Geek is always FREE and most times we have even free drinks and Pizza! That wouldn’t be possible without our awesome sponsors!

Wikimedia Deutschland

Many Thanks to Wikimedia Deutschland for sponsoring the great room and the possibility to record and even live stream the talks! The Wikimedia Foundation in Berlin is working on several Open Source projects. The most popular is of course Wikipedia. But indeed most of the engineers at Wikimedia in Berlin work on the WikiData project. That is the biggest fact database in the world.




Many Thanks to DataStax for the food sponsoring. DataStax is the company behind Apache Cassandra. If you need professional help & support for your Cassandra installation you should talk to DataStax. They have more than 300 employees all around the world, ready to help you.


Basho Technologies

Many Thanks to Basho Technologies for the food sponsoring. Basho Technologies is the company behind Riak. If you need professional support for your Riak installation you should contact Basho Technologies. And maybe you are even interested in their new Cloud Hosting Service for Riak.



And many thanks to VersionEye for organizing the event. For bringing together the right people, the right speakers and the right sponsors. VersionEye is a Notification System for Software Libraries. It helps developers to stay up-to-date.


How do you imagine the perfect Crowd Software Testing Tool?

The StartUp testCloud – a crowd software testing provider based in Berlin – is offering a service for crowd software testing. 


Now they are working on a new Crowd Software Testing Tool, which is completely self-service. They prepared a 3 min survey to get known your needs for the perfect Tool:

Everybody who finishes the survey can use the new tool for free up to 5 Bugs after official launch.  

I finished the survey by myself and I’m very curious to see the results.

How popular is VersionEye

VersionEye belongs to the top 100K Domains in the world! Alexa is measuring the traffic a Domain gets. As more traffic a Domain gets as lower is his Alexa Rank. Google has the Alexa Rank 1, because it is the most visited Domain on this planet! Facebook has the Rank 2 and Twitter the Rank 7. For the top 100K Domains Alexa draws a chart. 100K sounds a lot, but not really if you realize that there are 215 Million Domains online! Just to visualize it, this chart shows the top 100K Domains in red color. The other Domains are blue. Yes, there is a little thin red line in the blue cookie 🙂 That’s the top 100K Domains 🙂

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VersionEyes Global Rank is 96.535 and our Rank in Germany is 10.247! And it’s getting better 🙂 Check out the VersionEye Alexa Page.

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We are entering the Alexa Chart. Yahooo! And this are the countries we get most of the traffic from.

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According to Alexa there are 118 Domains linking to VersionEye. That’s not correct. According to Google there are 336 Domains linking to VersionEye!

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More than 4000 Links alone from GitHub, because of our awesome dependency and reference badges 🙂 Currently we are processing up to 140K HTTP Requests per day.

Many Thanks to our awesome community for all the support and the passion. This would not be possible without you! We keep up the good work. I promise!

VersionEye Enterprise updates

There are 2 new docker containers out for VersionEye Enterprise.

  • veye/rails_app:2.3.5
  • veye/rails_api:1.0.2
  • veye/

The new rails_app contains the new Single Page App for GitHub and Bitbucket. Which is much more straight forward and much faster.

Screen Shot 2014-07-31 at 10.12.36

The new rails_api contains updates for the new reference endpoints.

Unified search about your fav. web apps with StartHQ

StartHQ is one of the few tools I’m using every day! It is my default Tab Launcher for Chrome. Everytime I open a new tab in Chrome I see my StartHQ dashboard.



This works over the StartHQ Chrome extension. The cool thing here is that I can customize my Tab Launcher with the apps I like and everything is stored in the cloud. In that way I can use the same Tab Launcher over all my devices.

But the coolest feature is the unified search over all my favorite web apps. Let’s say I trigger a “MongoID” search on my StartHQ dashboard. This is the result list.



I get results from GMail, StackOverflow, DuckDuckGo, Twitter, GitHub and VersionEye. All in one place. It works the same for document searches. If you don’t know where you stored a document, simply search through all your web apps with StartHQ.

The unified search works through the extension, which is also available for Firefox, Safari and Opera. If you are logged in into your favorite Apps, the StartHQ Chrome AddOn can search through them and offer your deep links to your Cloud Content. The company StartHQ itself doesn’t have really access to your cloud services. Privacy wise it’s all safe. That’s awesome! Isn’t it?

Another really cool feature is the email newsletter. No! I’m not kidding you. The StartHQ Newsletter is one of the few newsletters I’m really reading, because it shows me the newest blog posts from my favorite Web Apps. Here is an example:


I really like the format because it’s short. In each section there are never more than 3 links! And they are always important to me. That’s perfect. It’s not another email newsletter with a never ending link collection.

Check it out today and give it a try. And let us know what you think on Twitter and Google+.

VersionEye is already integrated into the StartHQ search. In future we will work on a deeper integration with StartHQ.

New Single Page App for GitHub/Bitbucket integration

Yesterday we launched the new Single Page App for the VersionEye – GitHub/Bitbucket integration. For sure you know the old one. This here.


It had a lot of disadvantages. The UI was confusing and cluttered with a lot of information, which is not important for the VersionEye use case. And specially if you had a lot of branches and project files in a repository you had to scroll in the little fixed div area. That was not very comfortable.

The new SPA (Single Page App) is a completely rewrite, with ReactJS.  The UI is much simpler, there is nothing you can do wrong. This is the initial page.

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You get ALL your repositories listed, without any other useless information. With the text input field you can filter the list and quickly get to your desired repository. By clicking on a repository name you come to the next page, there we import ALL the branches and the supported project files.

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Here you can take advantage of the full size of your screen. If you want to monitor a file, simply flip the switch on. After the file is parsed the file name will turn into a link which leads to the VersionEye project page, where you can see all the dependencies of the file.

This SPA is much simpler than the old one. There is nothing you can do wrong and it works much faster. Beside the SPA we also refactored the backend services, which now take more advantage of RabbitMQ. You can try the new SPA in the login area here for GitHub:

And here for Bitbucket:

Let me know how you like it. Either here in the comments or on Twitter.