A live statistics monitoring system for the ATLAS distributed data management system

DQ2 is the distributed data management system of the ATLAS experiment. It manages more than 80 petabytes of experiment data on over 120 grid sites in the Worldwide LHC Computing Grid. The DQ2 system provides a common interface allowing interactions with ATLAS data without knowledge of the heterogenous grid systems. It maintains a central catalogue of all data stored on the ATLAS grid. Many users are working concurrently on the system, putting in new or accessing existing data. Each operation on the system is traced and there are multiple use cases where the system would benefit from live statistics computed over this data, e.g. dynamic data placement based on the popularity of datasets. This talk presents a new live statistics monitoring system for DQ2 that is currently in development.