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Unexpected increases in demand and most of all flash crowds are considered the bane of every web application as they may cause intolerable delays or even service unavailability. Proper quality of service policies must guarantee rapid reactivity and responsiveness even in such critical situations. Previous solutions fail to meet common performance requirements when the system has to face sudden and unpredictable surges of traffic. Indeed they often rely on a proper setting of key parametersdoi:10.1109/iwqos.2008.11 dblp:conf/iwqos/BartoliniBS08 fatcat:wzprlvkilrdqbc2gr7eyxd6hve