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Internet-scale web applications are becoming increasingly storage-intensiveand rely heavily on in-memory object caching to attain required I/Operformance. We argue that the emerging serverless computing paradigm providesa well-suited, cost-effective platform for object caching. We presentInfiniCache, a first-of-its-kind in-memory object caching system that iscompletely built and deployed atop ephemeral serverless functions. InfiniCacheexploits and orchestrates serverless functions' memory resources to enableelastic pay-per-use caching. InfiniCache's design combines erasure coding,intelligent billed duration control, and an efficient data backup mechanism tomaximize data availability and cost-effectiveness while balancing the risk oflosing cached state and performance. We implement InfiniCache on AWS Lambda andshow that it: (1) achieves 31 -- 96X tenant-side cost savings compared to AWSElastiCache for a large-object-only production workload, (2) can effectivelyprovide 95.4% data availability for each one hour window, and (3) enablescomparative performance seen in a typical in-memory cache.

InfiniCache: Exploiting Ephemeral Serverless Functions to Build a Cost-Effective Memory Cache