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Reports (Research Report) Year : 2012

Consistency in the Cloud:When Money Does Matter!


With the emergence of cloud computing, many organizations have moved their data to the cloud in order to provide scalable, reliable and highly available services. To meet ever growing user needs, these services mainly rely on geographically-distributed data replication to guarantee good performance and high availability. However, with replication, consistency comes into question. Service providers in the cloud have the freedom to select the level of consistency according to the access patterns exhibited by the applications.Most optimizations efforts then concentrate on how to provide adequate trade-offs between between consistency guarantees and performance. However, as the monetary cost completely relies on the service providers, in this paper we argue that monetary cost should be taken into consideration when evaluating or selecting a consistency level in the cloud. Accordingly, we define a new metric called consistency-cost efficiency. Based on this metric, we present a simple, yet efficient economical consistency model, called Bismar, that adaptively tunes the consistency level at run-time in order to reduce the monetary cost while simultaneously maintaining a low fraction of stale reads. Experimental evaluations with the Cassandra cloud storage on a Grid'5000 testbed show the validity of the metric and demonstrate the effectiveness of the proposed consistency model.
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Dates and versions

hal-00756314 , version 1 (22-11-2012)
hal-00756314 , version 2 (19-12-2012)


  • HAL Id : hal-00756314 , version 2


Houssem-Eddine Chihoub, Shadi Ibrahim, Gabriel Antoniu, María Pérez. Consistency in the Cloud:When Money Does Matter!. [Research Report] Inria. 2012. ⟨hal-00756314v2⟩
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