Installing Tokyo Tyrant in custom directory
In the process of testing Tokyo Cabinet and Tokyo Tyrant I just came across some small difficulties setting both up. Although the installation and configuration is almost straigth forward I stumbled about some small issues. The documentation on Tokyo Cabinet/Tyrant is not very comprehensive so far apart from the extensive API documentation. Installation and operations information are rare at the moment. There I've just written down my path to a running and manageable installation, which can easily deployed to several linux servers (OpenSuSE).
Key/value database storage engines
I recently dived into the world of distributed Key/Value database stores. Although key/value storage engines are nothing particular new, distributed implementation seem to gather some attention lately due to high scalability demands of current online services. Below are interesting reads about this topic together with some links to project I found particular interesting.
Articles
A very good overview article about different storage engines has been written by Richard Jones from Last.fm, in which he compares the different engines with the needs of last.fm in mind.
The following articles are more about specific implementation of a certain storage engine, but interesting to get to understand the whole principles more deeply.
- http://www.igvita.com/2009/02/13/tokyo-cabinet-beyond-key-value-store/
- http://bytepawn.com/readings-in-distributed-systems/
- http://push.cx/2009/rules-of-database-app-aging/
- http://bret.appspot.com/entry/how-friendfeed-uses-mysql/
Bob Ippolito gave a very comprehensive talk at PyCon 2009 on "Drop ACID and think about data", where he summarizes his experiences with different storage engines while implementing the service at Mochi Media. He presents the different storage engines and shows how their are being used for different purposes:
Perfect Dev Environment now with VirtualBox 2.2.0
VirtualBox 2.2.0 was released a week ago with a neat feature, that I really missed although I really like woking with VirtualBox. Now VirtualBox comes with a virtual Host interface called host-only interface, that enables the communication between the host and the guest even when no physical cable is connected to the machine, which happens a lot when you are on the road and would like to do some development.
Reference
20 Magazines for free
Apple's iPhone user's have access to more content due to a partnership of Apple and Zinio. The trick is that those digital magazines are only made available to iPhone users by checking the User Agent of the browser. All you need to do is to change the User Agent in your browser to the Phone that is used by the iPhone and then access the magazine, which include Technology Review, Macworld, Lonely Planet and ... Playboy and Penthouse.
Firefox users can install the User Agent Switcher add-on and configure it with the following User Agent:
Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420.1 (KHTML, like Gecko) Version/3.0 Mobile/4A102 Safari/419 (United States)
If you have done this, just visit the Zinio iPhone page: http://imgs.zinio.com/iphone/
Reference
Microsoft Research Report on IM usage
Microsoft Research just released a very interesting research report "Planetary-Scale Views on an Instant-Messaging Network" on the usage of Instant Messenger Usage. The anonymized study analyzed 30 billion conversations among 240 million people, from which a communication graph with 130 million nodes and 1.3 billion undirected edges has been constructed. The data for the analyzed dataset was gathered within 30 days in June 2006 and includes three main data sets:
- user demographic information
- time and user stamped events describing the presence of a particular user
- communication session logs
which have been used to conduct the analysis.
Reference
