{"id":157587,"date":"2009-05-01T00:00:00","date_gmt":"2009-05-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/vertical-paxos-and-primary-backup-replication\/"},"modified":"2018-10-16T21:59:14","modified_gmt":"2018-10-17T04:59:14","slug":"vertical-paxos-and-primary-backup-replication","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/vertical-paxos-and-primary-backup-replication\/","title":{"rendered":"Vertical Paxos and Primary-Backup Replication"},"content":{"rendered":"<div class=\"asset-content\">\n<p>We introduce a class of Paxos algorithms called Vertical Paxos, in which reconfiguration can occur in the middle of reaching agreement on an individual state-machine command. Vertical Paxos algorithms use an auxiliary configuration master that facilitates agreement on reconfiguration. A special case of these algorithms leads to traditional primary-backup protocols. We show how primary-backup systems in current use can be viewed, and shown to be correct, as instances of Vertical Paxos algorithms.<\/p>\n<p>This paper came out of much discussion between Malkhi, Zhou, and myself about reconfiguration. Some day, what we did may result in a long paper about state-machine reconfiguration containing these results and others that have not yet been published. The ideas here are related to the original, unpublished version of <a href=\"https:\/\/www.microsoft.com\/en-us\/research\/publication\/cheap-paxos\/\">[151]<\/a>.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We introduce a class of Paxos algorithms called Vertical Paxos, in which reconfiguration can occur in the middle of reaching agreement on an individual state-machine command. Vertical Paxos algorithms use an auxiliary configuration master that facilitates agreement on reconfiguration. A special case of these algorithms leads to traditional primary-backup protocols. We show how primary-backup systems 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