With the constant increasing of the quantity of data that companies collect and need to process, Data Warehousing is a job sector that's expnding even in the recession. It it also living a second youth, thanks to a number of open source projects that have been slowly but surely gaining popularity in a manner similar to linux 10 years ago. One of this technologies is Hadoop, a distributed filesystem and data processing framework based on Google's Map/Reduce paper. Hadoop powers Yahoo! Search, Facebook and many other sites' data warehouses.
