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Non-Monotonic Snapshot Isolation: scalable and strong consistency for geo-replicated transactional systems

Masoud Saeida Ardekani 1, * Pierre Sutra 2, * Marc Shapiro 1
* Corresponding author
1 Regal - Large-Scale Distributed Systems and Applications
LIP6 - Laboratoire d'Informatique de Paris 6, Inria Paris-Rocquencourt
Abstract : Modern cloud systems are geo-replicated to improve application latency and availability. Transactional consistency is essential for application developers; however, the corresponding concurrency control and commitment protocols are costly in a geo-replicated setting. To minimize this cost, we identify the following essential scalability properties: (i) only replicas updated by a transaction T make steps to execute T; (ii) a read-only transaction never waits for concurrent transactions and always commits; (iii) a transaction may read object versions committed after it started; and (iv) two transactions synchronize with each other only if their writes conflict. We present Non-Monotonic Snapshot Isolation (NMSI), the first strong consistency criterion to allow implementations with all four properties. We also present a practical implementation of NMSI called Jessy, which we compare experimentally against a number of well-known criteria. Our measurements show that the latency and throughput of NMSI are comparable to the weakest criterion, read-committed, and between two to fourteen times faster than well-known strong consistencies.
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https://hal.inria.fr/hal-00932758
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Masoud Saeida Ardekani, Pierre Sutra, Marc Shapiro. Non-Monotonic Snapshot Isolation: scalable and strong consistency for geo-replicated transactional systems. SRDS 2013 -IEEE 32nd International Symposium on Reliable Distributed Systems, Sep 2013, Braga, Portugal. pp.163-172, ⟨10.1109/SRDS.2013.25⟩. ⟨hal-00932758⟩

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