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Additionally, in geo-distributed fog\/edge environments, creating new operator instances on demand and replicating operators ubiquitously is restricted, posing challenges for achieving load balancing without overloading devices. Existing work predominantly focuses on cloud environments, overlooking DAF operator placement in resource-constrained and unreliable geo-distributed settings.<\/jats:p>\n          <jats:p>This paper presents NEMO, a resource-aware optimization approach that determines the replication factor and placement of DAF operators in resource-constrained geo-distributed topologies. Leveraging Euclidean embeddings of network topologies and a set of heuristics, NEMO scales to millions of nodes and handles topo-logical changes through adaptive re-placement and re-replication decisions. Compared to existing solutions, NEMO achieves up to 6\u00d7 lower latency and up to 15\u00d7 reduction in communication cost, while preventing overloaded nodes. Moreover, NEMO re-optimizes placements in constant time, regardless of the topology size. As a result, it lays the foundation to efficiently process continuous data streams on large, heterogeneous, and geo-distributed topologies.<\/jats:p>","DOI":"10.14778\/3648160.3648186","type":"journal-article","created":{"date-parts":[[2024,5,3]],"date-time":"2024-05-03T21:52:53Z","timestamp":1714773173000},"page":"1501-1514","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["Efficient Placement of Decomposable Aggregation Functions for Stream Processing over Large Geo-Distributed Topologies"],"prefix":"10.14778","volume":"17","author":[{"given":"Xenofon","family":"Chatziliadis","sequence":"first","affiliation":[{"name":"Technische Universit\u00e4t Berlin"}]},{"given":"Eleni Tzirita","family":"Zacharatou","sequence":"additional","affiliation":[{"name":"IT University of Copenhagen"}]},{"given":"Alphan","family":"Eracar","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Berlin"}]},{"given":"Steffen","family":"Zeuch","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Berlin"}]},{"given":"Volker","family":"Markl","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Berlin &amp; DFKI"}]}],"member":"320","published-online":{"date-parts":[[2024,5,3]]},"reference":[{"key":"e_1_2_1_1_1","volume-title":"2nd IEEE World Forum on Internet of Things. 459--464.","author":"Adjih C\u00e9dric","unstructured":"C\u00e9dric Adjih, Emmanuel Baccelli, Eric Fleury, Gaetan Harter, Nathalie Mitton, Thomas No\u00ebl, Roger Pissard-Gibollet, Frederic Saint-Marcel, Guillaume Schreiner, Julien Vandaele, and Thomas Watteyne. 2015. 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