The ATLAS EventIndex is the global catalogue of all ATLAS real and
simulated events. During the LHC long shutdown between Run 2
(2015-2018) and Run 3 (2022-2025) its components were substantially
revised, and a new system has been deployed for the start of Run 3 in
Spring 2022. The new core storage system is based on HBase tables with
a Phoenix interface. This seminar covers how we have faced the problem
of making a catalogue able to cope with trillions of entries: The
components of this catalogue, how the information is loaded, stored and
distributed in the catalogue, and how the old data was migrated from
the previous system.
IFIC Experimental Seminar organizers