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Two New Protocols for Fault Tolerant Agreement

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Executive Summary

The paper attempts to handle failures effectively, while reaching agreement, in a distributed transaction processing system. The standard protocols such as BFTDC, Zyzzyva and PBFT handle the problem to a greater extent. However, the limitation with these protocols is that they incur increased message overhead as well as large latency. Moreover, the nodes are evacuated from the transaction system after being declared faulty. The authors propose a novel proactive based agreement which identifies the tentative failures in the system. To improve the failure resiliency with minimum execution overhead, they also propose an optimized reactive view change mechanism. Both mechanisms have been analyzed and compared.

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