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We design and implement LEGOStore, an erasure coding (EC) based linearizabledata store over geo-distributed public cloud data centers (DCs). For such adata store, the confluence of the following factors opens up opportunities forEC to be latency-competitive with replication: (a) the necessity ofcommunicating with remote DCs to tolerate entire DC failures and implementlinearizability; and (b) the emergence of DCs near most large populationcenters. LEGOStore employs an optimization framework that, for a given object,carefully chooses among replication and EC, as well as among various DCplacements to minimize overall costs. To handle workload dynamism, LEGOStoreemploys a novel agile reconfiguration protocol. Our evaluation using aLEGOStore prototype spanning 9 Google Cloud Platform DCs demonstrates theefficacy of our ideas. We observe cost savings ranging from moderate (5-20\%)to significant (60\%) over baselines representing the state of the art whilemeeting tail latency SLOs. Our reconfiguration protocol is able to transitionkey placements in 3 to 4 inter-DC RTTs ($<$ 1s in our experiments), allowingfor agile adaptation to dynamic conditions.

LEGOStore: A Linearizable Geo-Distributed Store Combining Replication and Erasure Coding