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To handle growing traffic, Content Delivery Networks (CDNs) increasingly rely on a mix of dedicated infrastructure and lower-cost, heterogeneous edge resources. Our analysis of production data reveals two emerging characteristics in modern live delivery: dynamic regional supply-demand imbalance and per-stream heterogeneity in popularity and geography. However, existing request mapping solutions fall short in this new landscape, as they assume stable regional capacity and overlook stream-level heterogeneity. This paper proposes\n                    <jats:sc>LiveMap<\/jats:sc>\n                    , a cost-efficient and latency-aware request mapping system for live CDNs.\n                    <jats:sc>LiveMap<\/jats:sc>\n                    performs online bandwidth provisioning via dual-level coordination to resolve regional supply-demand imbalances and reduce bandwidth costs. Further,\n                    <jats:sc>LiveMap<\/jats:sc>\n                    introduces an adaptive stream mapping strategy that dynamically forms per-stream delivery groups based on real-time popularity and system load. Deployed in Bilibili CDN serving crowdsourced live streaming over a year,\n                    <jats:sc>LiveMap<\/jats:sc>\n                    reduces bandwidth costs by 42.18% and access latency by 20.26%, outperforming the state-of-the-art solutions.\n                  <\/jats:p>","DOI":"10.1145\/3768978","type":"journal-article","created":{"date-parts":[[2025,11,25]],"date-time":"2025-11-25T17:09:56Z","timestamp":1764090596000},"page":"1-26","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Cost-efficient Request Mapping for Large-scale Live Streaming Services"],"prefix":"10.1145","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-7866-120X","authenticated-orcid":false,"given":"Yu","family":"Tian","sequence":"first","affiliation":[{"name":"Institute of Computing Technology, Chinese Academy of Sciences (ICT, CAS), Beijing, China and University of Chinese Academy of Sciences (UCAS), Beijing, 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