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Many service applications use actors as a programming model for the middle tier, to simplify synchronization, fault-tolerance, and scalability. However, efficient operation of such actors in multiple, geographically distant datacenters is challenging, due to the very high communication latency. Caching and replication are essential to hide latency and exploit locality; but it is not a priori clear how to combine these techniques with the actor programming model. We present Geo, an open-sourcedoi:10.1145/3133931 dblp:journals/pacmpl/BernsteinBBCFKK17 fatcat:redqe536w5epvhkeisn5jcgpgy