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3For a full journal version of this paper see: Dhruv Kumar, Jian Li, Abhishek Chandra and Ramesh K. Sitaraman. 2019. A TTL-based Approach for Data Aggregation in Geo-distributed Streaming Analytics. Proc. ACM Meas. Anal. Comput. Syst. Vol. 3, No. 2, Article 29 (June 2019). DOI: https://doi.org/10.1145/3326144. 4This research was sponsored by the NSF under Grant CNS-1717834, 1717179, and by the U.S. ARL and the U.K. MoD under Agreement Number W911NF-16-3-0001.