The questions of reality have always followed mankind, at least, throughout the last two centuries. Does reality actually exist or is it just a simulation of a higher form of life? Are we alone in the universe? Is there any way to travel from one period of time to another?...

The interest in using scalable data processing solutions based on Apache Hadoop ecosystem is constantly growing in the High Energy Physics (HEP) community. This drives the need for increased reliability and availability of the central Hadoop service and underlying infrastructure provided to the community by the CERN IT department. This...