Recently I came across a interesting Company called Gilt which is one of the leading eCommerce company. What is interesting about it is, the whole company runs on real time analytics. Instead of I explaining what is real time analytics, click on the Hummingbird Slideshare presentation, Hummingbird Vimeo link, Hummingbird website and Hummingbird Demo to understand more. The good news is they donated the code that runs this to Git here. Setting up Himmingbird is described in the Git location. The Hummingbird tracking pixel server by default starts in port 8000 and the Monitor server start in port 8080.
<img id="tracking-pixel" src="http://localhost:8000/tracking_pixel.gif?events=scAdd&productId=10&ip=220.127.116.11" alt="data analytics" />
And in the querysting of the image, pass whatever value you want to analyse, for example if you want know to how many times a product has been purchased from which location, the data is stored in MongoDb and later it can be analysed over a time range. The over all architecture is as below,