Causally coordinated snapshot isolation for geographically replicated data

Vinit Padhye, Anand Tripathi

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


We propose a Snapshot Isolation based transaction execution and consistency model, referred to as causally coordinated snapshot isolation, for geographically replicated data. The data replication is managed through asynchronous update propagation. Our approach provides snapshot-isolation model over multiple sites and ensures causal ordering of transactions. We present here an efficient protocol for precisely capturing the causal data dependencies of transactions and ensuring the causal ordering based on these dependencies when applying transactions' updates at remote sites. Through experimental evaluations, we demonstrate the benefit of this protocol over an alternative approach for providing causal consistency for georeplicated data. We further extend this model to support session consistency guarantees such as read-your-writes and monotonic reads. Additionally, we provide a notion of group-session where a group of users are involved in a collaborative session. We provide various group-session consistency guarantees for users collaborating in a group. We present the mechanisms for providing these session consistency guarantees and evaluate their performance.

Original languageEnglish (US)
Article number6424864
Pages (from-to)261-266
Number of pages6
JournalProceedings of the IEEE Symposium on Reliable Distributed Systems
StatePublished - 2012
Event31st IEEE International Symposium on Reliable Distributed Systems, SRDS 2012 - Irvine, CA, United States
Duration: Oct 8 2012Oct 11 2012


  • Causal Consistency
  • Data Replication
  • Geographic Replication
  • Session Consistency Models
  • Snapshot Isolation
  • Transaction Management


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