Addressing Scalability with Message Queues: Architecture and Use Cases for DIRAC Interware Wojciech Krzemien, Federico Stagni, Christophe Haen, Zoltan Mathe, Andrew McNab and Milosz Zdybal EPJ Web Conf., 214 (2019) 03018 Published online: 17 September 2019 DOI: 10.1051/epjconf/201921403018