E.V. Tsviashchenko - Post-graduate Student, Bauman Moscow State Technical University; Leading Specialist, LLC "RPC "CRONOS-INFORM - (Moscow) E- mail: eugene.tsviashchenko@gmail.com

While using replication on NoSQL databases the problem of replicas agreement is appeared. It is manifested as follows: once the record is updated on the one node, data on others nodes become stale. Consistency level can be adjusted by parameters (N, W, R): N - count of nodes, on which the record will be replicated eventually (may be with some latency); W - count of nodes (replicas), on which data has to be written in fact (after this, an answer about operation success will be send to user; if W

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References

 

1. Bailis P., Venkataraman S., Franklin M.J, Hellerstein J., Stoica I. Probabilistically Bounded Staleness for Practical Partial Quorums, [EHlektronnyjj resurs] [http://www.eecs.berkeley.edu/Pubs/TechRpts/2012/EECS-2012-4.pdf].