CAnDoR: Consistency Aware Dynamic data Replication

Data management has become crucial. More and more distributed data management solutions arise, e.g. Casandra or Cosmos DB. Some of them propose multiple consistency protocols. Thus, for each piece of data, the developer can choose a consistency protocol adapted to his needs. In this paper we explain why taking the consistency protocol into account is important while replicating data; and we propose CAnDoR, an approach that dynamically adapts the replication according to the data usage (read/write frequencies and locations) and the consistency protocol used to manage the piece of data. Our simulations show that using CAnDoR to place and move data copies can improve the global average access latency by up to 40%.