The Cascalog system has combined the Cascading system for abstraction of advanced data processing on Hadoop and other systems, the Datalog declarative programming language that is well suited for expressing database queries in an abstract form, and the Clojure language to create a declarative language for queries that can be run on Apache Hadoop.
The limited roll out will allow the results to be tweaked, and supply the engineering team with more data onqueries made and how people (more importantly, how people who advertise on Facebook) interact with the service.
Through this significant coup Google will power more than 90 per cent of all Internet search queries in the Japan market, but the consumer user interface would be different on Yahoo!