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Inter-coflow scheduling improves application-level communication performance in data-parallel clusters. However, existing efficient schedulers require a priori coflow information and ignore cluster dynamics like pipelining, task failures, and speculative executions, which limit their applicability. Schedulers without prior knowledge compromise on performance to avoid head-of-line blocking. In this paper, we present Aalo that strikes a balance and efficiently schedules coflows without priordoi:10.1145/2785956.2787480 dblp:conf/sigcomm/ChowdhuryS15 fatcat:mcejrhhldzbujjwtgnskmwtvem