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An Optimized Multi-Paxos Protocol with Centralized Failover Mechanism for Cloud Storage Applications

  • Wenmin Lin
  • Hao Jiang
  • Nailiang ZhaoEmail author
  • Jilin Zhang
Conference paper
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 268)

Abstract

For typical Multi-Paxos protocol running on a cloud storage application, the failover mechanism is complex in terms of implementation. When the leader fails within a replica group, a new leader should be elected by broadcasting prepare requests over the replica group. Moreover, repairing new leader’s missing log entries requires broadcasting prepare request as well. This introduces too much network cost and increase the latency to restore normal storage service at the same time. In view of this challenge, an optimization for Multi-Paxos protocol with centralized failover mechanism for cloud storage applications is proposed in this paper. Compared with typical Multi-Paxos protocol, failover mechanism and normal client requests handling logic are split, and been handled by two clusters respectively: A coordinator cluster is dedicated to handle failover issues as a central manager; while a data cluster only takes charge of data replication and storage regarding client commands. With the centralized failover mechanism in the new design, the centralized coordinator cluster maintains real-time status information of each replica group. And a replica with largest apply index value is elected as the new leader by coordinator cluster; while repairing missing log entries can be achieved with limited replica’s bitmap information maintained by coordinator cluster as well. Comparison between two protocols is implemented and analyzed to prove the feasibility of our proposal.

Keywords

Centralized failover mechanism Multi-Paxos Replica group Leader election Leader repair 

Notes

Acknowledgement

This paper is supported by The National Key Research and Development Program of China (No. 2017YFB1400601), National Natural Science Foundation of China (No. 61872119), Natural Science Foundation of Zhejiang Province (No. LY12F02003).

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Copyright information

© ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2019

Authors and Affiliations

  • Wenmin Lin
    • 1
  • Hao Jiang
    • 1
  • Nailiang Zhao
    • 2
    Email author
  • Jilin Zhang
    • 2
  1. 1.School of Computer Science and TechnologyHangzhou Dianzi UniversityHangzhouChina
  2. 2.Network and Information CenterHangzhou Dianzi UniversityHangzhouChina

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