Efficient Numerical Error Bounding for Replicated Network Services
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Design and evaluation of a continuous consistency model for replicated services
OSDI'00 Proceedings of the 4th conference on Symposium on Operating System Design & Implementation - Volume 4
Automating service quality with TOMCAD (Tradeoff Model with Capacity and Demand)
Proceedings of the 2007 workshop on Automating service quality: Held at the International Conference on Automated Software Engineering (ASE)
Jgroup-ARM: a distributed object group platform with autonomous replication management
Software—Practice & Experience
ISAS'04 Proceedings of the First international conference on Service Availability
Inconsistency evaluation in a replicated IP-Based call control system
ISAS'06 Proceedings of the Third international conference on Service Availability
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An ultimate goal for modern Internet services is the development of scalable, high-performance, highly available and fault-tolerant systems. Replication is an important approach to achieve this goal. However, replication introduces the issue of consistency among replicas, which is further complicated by network partitions. Generally, higher consistency levels result in lower system availability in the presence of network partitions. Thus, there is a fundamental tradeoff between consistency and availability in building replicated Internet services.In this paper, we argue that Internet services can benefit from dynamically choosing availability/consistency tradeoffs. With three consistency metrics, Unseen Writes, Uncommitted Writes and Staleness, we show how consistency can be meaningfully quantified for many Internet services. We present the design of the TACT (Tunable Availability and Consistency Tradeoffs) toolkit that allows Internet services to flexibly and dynamically choose their own availability/consistency tradeoffs, enabling differentiated availability/consistency quality of service. Further, TACT makes it possible for Internet services to dynamically trade consistency for performance.