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Replication is a common technique used to design reliable distributed systems by masking defective components. To cope with the requirements of modern Internet applications, replication protocols must allow for throughput scalability and dynamic reconfiguration, that is, on-demand replacement or provisioning of system resources. This paper describes Elastic Paxos, a new dynamic atomic multicast protocol...
State machine replication (SMR) is a well-known technique that guarantees strong consistency (i.e., linearizability) to online services. In SMR, client commands are executed in the same order on all server replicas: after executing each command, every replica reaches the same state. However, SMR lacks scalability: every replica executes all commands, so adding servers does not increase the maximum...
It has been shown that the highest throughput for broadcasting messages in a point-to-point network is achieved with a ring topology. Although several ring-based group communication protocols have benefited from this observation, broadcasting messages along a ring overlay may lead to high latencies: In a system with n processes, at least n-1 communication steps are necessary for all processes to deliver...
Deferred update replication (DUR) is an established approach to implementing highly efficient and available storage. While the throughput of read-only transactions scales linearly with the number of deployed replicas in DUR, the throughput of update transactions experiences limited improvements as replicas are added. This paper presents Parallel Deferred Update Replication (P-DUR), a variation of...
Byzantine fault-tolerance is costly, both in terms of increased latency and limited scalability. Most recent contributions in the area have addressed the latency aspect, leaving the throughput scalability problem largely untouched. We propose in this short paper to build scalable Byzantine fault-tolerant storage systems based on the concept of mini-transactions. To achieve this goal we propose a novel...
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